10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_________________________________________________________________________________________________

FORM 10-K

þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended: December 31, 2017

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number: 001-36211

_____________________________________________________________________________________________________

Noble Corporation plc

(Exact name of registrant as specified in its charter)

England and Wales (Registered Number 08354954)	98-0619597
(State or other jurisdiction of incorporation or organization)	(I.R.S. employer identification number)

Devonshire House, 1 Mayfair Place, London, England, W1J8AJ

(Address of principal executive offices) (Zip Code)

Registrant’s Telephone Number, Including Area Code: +44 20 3300 2300

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Shares, Nominal Value $0.01 per Share	New York Stock Exchange

Commission file number: 001-31306

_____________________________________________________________________________________________________

Noble Corporation

(Exact name of registrant as specified in its charter)

Cayman Islands	98-0366361
(State or other jurisdiction of incorporation or organization)	(I.R.S. employer identification number)

Suite 3D Landmark Square, 64 Earth Close, P.O. Box 31327 George Town, Grand Cayman, Cayman Islands, KY1-1206

(Address of principal executive offices) (Zip Code)

Registrant’s Telephone Number, Including Area Code: (345) 938-0293

Securities registered pursuant to Sections 12(b) and 12(g) of the Act: None

_______________________________________________________________________________________________

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  þ   No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  þ

Indicate by check mark whether each registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ    No  ¨

Indicate by check mark whether each registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months.    Yes  þ    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.   ¨

Indicate by check mark whether each registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Noble Corporation plc:	Large accelerated filer þ	Accelerated filer ¨	Non-accelerated filer ¨	Smaller reporting company ¨	Emerging growth company ¨
Noble Corporation:	Large accelerated filer ¨	Accelerated filer ¨	Non-accelerated filer þ	Smaller reporting company ¨	Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ¨

Indicate by check mark whether each registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  þ

As of June 30, 2017, the aggregate market value of the registered shares of Noble Corporation plc held by non-affiliates of the registrant was $876.0 million based on the closing sale price as reported on the New York Stock Exchange.

Number of shares outstanding and trading at February 20, 2018: Noble Corporation plc — 246,776,217

Number of shares outstanding: Noble Corporation — 261,245,693

DOCUMENTS INCORPORATED BY REFERENCE

The proxy statement for the 2018 annual general meeting of the shareholders of Noble Corporation plc will be incorporated by reference into Part III of this Form 10-K.

This Form 10-K is a combined annual report being filed separately by two registrants: Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), and its wholly-owned subsidiary, Noble Corporation, a Cayman Islands company (“Noble-Cayman”). Noble-Cayman meets the conditions set forth in General Instructions I(1)(a), (b) and (d) of Form 10-K and is therefore filing this Form 10-K with the reduced disclosure format contemplated by General Instructions I(2)(a) and (c) of Form 10-K.

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TABLE OF CONTENTS

		Page
PART I
Item 1.	Business	4
Item 1A.	Risk Factors	10
Item 1B.	Unresolved Staff Comments	22
Item 2.	Properties	22
Item 3.	Legal Proceedings	25
Item 4.	Mine Safety Disclosures	25
PART II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	25
Item 6.	Selected Financial Data	28
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	28
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	44
Item 8.	Financial Statements and Supplementary Data	46
Item 9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	102
Item 9A.	Controls and Procedures	102
Item 9B.	Other Information	104
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	104
Item 11.	Executive Compensation	105
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	105
Item 13.	Certain Relationships, Related Transactions and Directors Independence	105
Item 14.	Principal Accounting Fees and Services	105
PART IV		105
Item 15.	Exhibits, Financial Statement Schedules	106
Item 16.	Form 10-K Summary	106
	SIGNATURES	116

This combined Annual Report on Form 10-K is separately filed by Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), and Noble Corporation, a Cayman Islands company (“Noble-Cayman”). Information in this filing relating to Noble-Cayman is filed by Noble-UK and separately by Noble-Cayman on its own behalf. Noble-Cayman makes no representation as to information relating to Noble-UK (except as it may relate to Noble-Cayman) or any other affiliate or subsidiary of Noble-UK.

This report should be read in its entirety as it pertains to each Registrant. Except where indicated, the Consolidated Financial Statements and the Notes to the Consolidated Financial Statements are combined. References in this Annual Report on Form 10-K to “Noble,” the “Company,” “we,” “us,” “our” and words of similar meaning refer collectively to Noble-UK and its consolidated subsidiaries, including Noble-Cayman.

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Forward-Looking Statements

This Annual Report on Form 10-K includes “forward-looking statements” within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the U.S. Securities Exchange Act of 1934, as amended, (the “Exchange Act”). All statements other than statements of historical facts included in this report or in the documents incorporated by reference, including those regarding rig demand, the offshore drilling market, oil prices, contract backlog, fleet status, our future financial position, business strategy, impairments, repayment of debt, credit ratings, borrowings under our Credit Facilities (as defined herein) or other instruments, sources of funds, future capital expenditures, contract commitments, dayrates, contract commencements, extension or renewals, contract tenders, the outcome of any dispute, litigation, audit or investigation, plans and objectives of management for future operations, foreign currency requirements, results of joint ventures, indemnity and other contract claims, reactivation, refurbishment, conversion and upgrade of rigs, industry conditions, access to financing, impact of competition, governmental regulations and permitting, availability of labor, worldwide economic conditions, taxes and tax rates, indebtedness covenant compliance, dividends and distributable reserves, timing or results of acquisitions or dispositions, and timing for compliance with any new regulations are forward-looking statements. When used in this report or in the documents incorporated by reference, the words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “plan,” “project,” “should” and similar expressions are intended to be among the statements that identify forward-looking statements. Although we believe that the expectations reflected in such forward-looking statements are reasonable, we cannot assure you that such expectations will prove to be correct. Actual results could differ materially from those expressed as a result of various factors. These factors include those referenced or described under “Risk Factors” included in this report, or in our other SEC filings, among others. Such risks and uncertainties are beyond our ability to control, and in many cases, we cannot predict the risks and uncertainties that could cause our actual results to differ materially from those indicated by the forward-looking statements. You should consider these risks when you are evaluating us.

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PART I

Item 1. Business.

Overview

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), is a leading offshore drilling contractor for the oil and gas industry. We provide contract drilling services with our global fleet of mobile offshore drilling units. We report our contract drilling operations as a single reportable segment, Contract Drilling Services, which reflects how we manage our business. The mobile offshore drilling units comprising our offshore rig fleet operate in a global market for contract drilling services and are often redeployed to different regions due to changing demands of our customers, which consist primarily of large, integrated, independent and government-owned or controlled oil and gas companies throughout the world. As of February 20, 2018, our 28-rig fleet consisted of eight drillships, six semisubmersibles and 14 jackups.

For additional information on the specifications of our fleet, see Part I, Item 2, “Properties— Drilling Fleet.” At December 31, 2017, our fleet was located in Canada, Far East Asia, the Middle East, the North Sea, Oceania, South America and the Gulf of Mexico. Noble and its predecessors have been engaged in the contract drilling of oil and gas wells since 1921.

Noble Corporation, a Cayman Islands company (“Noble-Cayman”), is an indirect, wholly-owned subsidiary of Noble-UK, our publicly-traded parent company. Noble-UK’s principal asset is all of the shares of Noble-Cayman. Noble-Cayman has no public equity outstanding. The consolidated financial statements of Noble-UK include the accounts of Noble-Cayman, and Noble-UK conducts substantially all its business through Noble-Cayman and its subsidiaries.

On August 1, 2014, Noble-UK completed the separation and spin-off of a majority of its standard specification offshore drilling business (the “Spin-off”) through a pro rata distribution of all the ordinary shares of its wholly-owned subsidiary, Paragon Offshore plc (“Paragon Offshore”), to the holders of Noble’s ordinary shares. Our shareholders received one share of Paragon Offshore for every three shares of Noble owned as of July 23, 2014, the record date for the distribution. Through the Spin-off, we disposed of most of our standard specification drilling units and related assets, liabilities and business. Prior to the Spin-off, Paragon Offshore issued approximately $1.7 billion of long-term debt, the proceeds of which were used to repay certain amounts outstanding under our commercial paper program. The results of operations for Paragon Offshore prior to the Spin-off date and incremental Spin-off related costs have been classified as discontinued operations for all periods presented in this Annual Report on Form 10-K.

For additional information regarding the Spin-off and our current relationship with Paragon Offshore, see Part I, Item 1A, "Risk Factors" and Part II, Item 8, “Financial Statements and Supplementary Data, Note 14— Commitments and Contingencies.”

Business Strategy

Our goal is to be the preferred offshore drilling contractor for the oil and gas industry based upon the following core principles:

• operate in a manner that provides a safe working environment for our employees and contractors while protecting the environment and our assets;

• provide an attractive investment vehicle; and

• deliver superior customer service through a diverse and technically advanced fleet operated by proficient crews.

Our business strategy focuses on a balanced, high-specification fleet of floating and jackup rigs and the deployment of our drilling rigs in oil and gas basins around the world.

We have expanded our drilling and fleet through our newbuild program. We took delivery of our last remaining newbuild, the heavy-duty, harsh environment jackup, the Noble Lloyd Noble, in July 2016. The Noble Lloyd Noble commenced operations in November 2016 under a four-year contract in the North Sea. Although we plan to prioritize capital preservation and liquidity based on current market conditions, from time to time we will also continue to evaluate opportunities to enhance our fleet, particularly focusing on higher specification rigs, to execute the increasingly complex drilling programs required by our customers.

Drilling Services

We typically employ each drilling unit under an individual contract. Although the final terms of the contracts result from negotiations with our customers, many contracts are awarded based upon a competitive bidding process. Our drilling contracts generally contain the following terms:

• contract duration extending over a specific period of time or a period necessary to drill a defined number wells;

• payment of compensation to us (generally in U.S. Dollars although some customers, typically national oil companies, require a part of the compensation to be paid in local currency) on a “daywork” basis, so that we receive a fixed amount for each day (“dayrate”) that the drilling unit is operating under contract (a lower rate or no compensation is payable during periods of

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equipment breakdown and repair or adverse weather or in the event operations are interrupted by other conditions, some of which may be beyond our control);

• provisions permitting early termination of the contract by the customer (i) if the unit is lost or destroyed or (ii) if operations are suspended for a specified period of time due to breakdown of equipment or breach of contract;

• provisions allowing the impacted party to terminate the contract if specified “force majeure” events beyond the contracting parties’ control occur for a defined period of time;

• payment by us of the operating expenses of the drilling unit, including labor costs and the cost of incidental supplies;

• provisions that allow us to recover certain cost increases from our customers in certain long-term contracts; and

• provisions that require us to lower dayrates for documented cost decreases in certain long-term contracts.

The terms of some of our drilling contracts permit the customer to terminate the contract after specified notice periods by tendering contractually specified termination amounts and, in certain cases, without any payment.

Generally, our contracts allow us to recover our mobilization and demobilization costs associated with moving a drilling unit from one regional location to another. When market conditions require us to assume these costs, our operating margins are reduced accordingly. For shorter moves, such as “field moves,” our customers have generally agreed to assume the costs of moving the unit in the form of a reduced dayrate or “move rate” while the unit is being moved. Under current market conditions, we are much less likely to receive full reimbursement of our mobilization and demobilization costs.

During periods of depressed market conditions, such as the one we are currently experiencing, our customers may attempt to renegotiate or repudiate their contracts with us although we seek to enforce our rights under our contracts. The renegotiations may include changes to key contract terms, such as pricing, termination and risk allocation. 

For a discussion of our backlog of commitments for contract drilling services, please read Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations— Contract Drilling Services Backlog.”

Significant Customers

Offshore contract drilling operations accounted for approximately 98 percent of our operating revenues for the years ended December 31, 2017, 2016 and 2015. During the three years ended December 31, 2017, we principally conducted our contract drilling operations in Canada, Far East Asia, the Middle East, the North Sea, Oceania, South America and the Gulf of Mexico. Revenues from Royal Dutch Shell plc (“Shell”), Statoil ASA (“Statoil”) and Saudi Arabian Oil Company (“Saudi Aramco”) accounted for approximately 45.0 percent, 13.2 percent, and 11.4 percent, respectively, of our consolidated operating revenues for the year ended December 31, 2017. Revenues from Shell and Freeport-McMoRan Inc. (“Freeport”) accounted for approximately 37.5 percent and 24.5 percent, respectively, of our consolidated operating revenues for the year ended December 31, 2016. Revenues from Shell and Freeport accounted for approximately 49.0 percent and 14.2 percent, respectively, of our consolidated operating revenues for the year ended December 31, 2015. No other customer accounted for more than 10 percent of our consolidated operating revenues in 2017, 2016 or 2015.

On May 10, 2016, Freeport, Freeport-McMoRan Oil & Gas LLC and one of our subsidiaries entered into an agreement terminating the contracts on the Noble Sam Croft and the Noble Tom Madden (“FCX Settlement”), which were scheduled to end in July 2017 and November 2017, respectively. During 2016, we recognized approximately $393.0 million in “Contract drilling services revenue” associated with the FCX Settlement. Excluding the $393.0 million of revenue attributable to the FCX Settlement our primary customers during 2016 would have been Shell, Anadarko Petroleum Corporation and Freeport, accounting for approximately 45.0 percent, 11.0 percent and 9.0 percent of our consolidated operation revenues, respectively.

Market

Our operations are geographically dispersed in oil and gas exploration and development areas throughout the world. We may mobilize our drilling rigs between regions for a variety of reasons, including to respond to customer contracting requirements or capture demand in another locale. Demand for our services is, in significant part, a function of the worldwide demand for oil and gas and the global supply of mobile offshore drilling units. In recent years, there has been a significant increase in the number of units, while crude oil prices have declined from approximately $112 per barrel for Brent crude on June 30, 2014 to as low as approximately $30 per barrel in January 2016, before improving to $65 per barrel on February 20, 2018. Our customers have greatly reduced their exploration and development spending and the number of rigs they have under contract since 2014. This combination of increased supply of drilling rigs and reduced demand for such rigs has resulted in falling dayrates and significantly reduced opportunities to re-contract our rigs upon expiry of existing contracts.

The offshore contract drilling industry is a highly competitive and cyclical business characterized by large capital expenditures and high operating and maintenance costs. We compete with other providers of offshore drilling rigs, and some of our competitors may have access to greater financial resources than we do.

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In the provision of contract drilling services, competition involves numerous factors. Price competition, rig availability, location and rig suitability and technical specifications are the primary factors in determining which contractor is awarded a job, although other factors are important, including experience of the workforce, efficiency, safety performance record, condition of equipment, operating integrity, reputation, industry standing and client relations. In addition to having one of the newest fleets in the industry among our peer companies, we follow a policy of keeping our equipment well-maintained and technologically competitive. However, our rigs could be made obsolete by the development of new techniques and equipment, regulations or customer preferences.

We compete on a worldwide basis, but competition may vary by region. Demand for offshore drilling equipment also depends on the exploration and development programs of oil and gas companies, which in turn are influenced by many factors, including the price of oil and gas, the financial condition of such companies, general global economic conditions, energy demand, political considerations and national oil and gas policy, many of which factors are beyond our control. In addition, industry-wide shortages of supplies, services, skilled personnel and equipment necessary to conduct our business have historically occurred. While we do not anticipate this being an issue in the current market environment, we cannot assure that any such shortages experienced in the past will not happen again in the future.

Employees

At December 31, 2017, we had approximately 2,000 employees, excluding approximately 600 persons we engaged through labor contractors or agencies. Approximately 83 percent of our workforce is located offshore. We are not a party to any material collective bargaining agreements, and we consider our employee relations to be satisfactory.

We place considerable value on the involvement of our employees and maintain a practice of keeping them informed on matters affecting them, as well as on the performance of the Company. Accordingly, we conduct formal and informal meetings with employees, maintain a Company intranet website with matters of interest, issue periodic publications of Company activities and other matters of interest, and offer a variety of in-house training, including through NobleAdvances, our state of the art training facility in Sugar Land, Texas.

We are committed to a policy of recruitment and promotion based upon merit without discrimination. Management actively pursues both the employment of disabled persons whenever a suitable vacancy arises and the continued employment and retraining of employees who become disabled while employed by the Company. Training and development is undertaken for all employees, including disabled persons.

Governmental Regulations and Environmental Matters

Political developments and numerous governmental regulations, which may relate directly or indirectly to the contract drilling industry, affect many aspects of our operations. Our contract drilling operations are subject to various laws and regulations in countries in which we operate, including laws and regulations relating to the equipping and operation of drilling units, environmental discharges and related recordkeeping, safety management systems, the reduction of greenhouse gas emissions to address climate change, currency conversions and repatriation, oil and gas exploration and development, taxation of offshore earnings and earnings of expatriate personnel and use of local employees, content and suppliers by foreign contractors. A number of countries actively regulate and control the ownership of concessions and companies holding concessions, the exportation of oil and gas and other aspects of the oil and gas industries in their countries. In addition, government actions, including initiatives by the Organization of Petroleum Exporting Countries (“OPEC”), may continue to contribute to oil price volatility. In some areas of the world, this government activity has adversely affected the amount of exploration and development work done by oil and gas companies and their need for offshore drilling services, and likely will continue to do so.

The regulations applicable to our operations include provisions that regulate the discharge of materials into the environment or require remediation of contamination under certain circumstances. Many of the countries in whose waters we operate from time to time regulate the discharge of oil and other contaminants in connection with drilling and marine operations. Failure to comply with these laws and regulations, or failure to obtain or comply with permits, may result in the assessment of administrative, civil and criminal penalties, imposition of remedial requirements and the imposition of injunctions to force future compliance. We are also subject to a plea agreement with the U.S. Department of Justice (“DOJ”) in connection with prior operations in Alaska, and any future environmental incidents could have an impact on the plea agreement or related actions that the DOJ or other regulatory agencies may take against us as a result of such an incident. We were granted our motion to terminate the Alaska plea agreement effective March 1, 2018. We have made, and will continue to make, expenditures to comply with environmental requirements. We do not believe that our compliance with such requirements will have a material adverse effect on our results of operations, our competitive position or materially increase our capital expenditures. Although these requirements impact the oil and gas and energy services industries, generally they do not appear to affect us in any material respect that is different, or to any materially greater or lesser extent, than other companies in the energy services industry. However, our business and prospects could be adversely affected by regulatory activity that prohibits or restricts our customers’ exploration and production activities, results in reduced demand for our services or imposes environmental protection requirements that result in increased costs to us, our customers or the oil and natural gas industry in general.

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The following is a summary of some of the existing laws and regulations that apply in the United States and Europe, which serves as an example of the various laws and regulations to which we are subject. While laws vary widely in each jurisdiction, each of the laws and regulations below addresses environmental issues similar to those in most of the other jurisdictions in which we operate.

Spills and Releases. The Comprehensive Environmental Response, Compensation, and Liability Act in the U.S. (“CERCLA”), and similar state and foreign laws and regulations, impose joint and several liabilities, without regard to fault or the legality of the original act, on certain classes of persons that contributed to the release of a “hazardous substance” into the environment. In the course of our ordinary operations, we may generate waste that may fall within CERCLA’s definition of a “hazardous substance.” However, we have to-date not received any notification that we are, or may be, potentially responsible for cleanup costs under CERCLA.

Offshore Regulation and Safety.In response to the Macondo well blowout incident in April 2010, the U.S. Department of Interior, through the Bureau of Ocean Energy Management (“BOEM”) and the Bureau of Safety and Environmental Enforcement (“BSEE”), has undertaken an aggressive overhaul of the offshore oil and natural gas regulatory process that has significantly impacted oil and gas development in the U.S. Gulf of Mexico. From time to time, new rules, regulations and requirements have been proposed and implemented by BOEM, BSEE or the United States Congress that materially limit or prohibit, and increase the cost of, offshore drilling. We are also subject to the Ports and Waterways Safety Act (“PWSA”) and similar regulations, which impose certain operational requirements on offshore rigs operating in the U.S. and governs liability for vessel or cargo loss, or damage to life, property, or the marine environment. See “Risk Factors-Risk Factors Relating to Our Business-Changes in, compliance with, or our failure to comply with the certain laws and regulations may negatively impact our operations and could have a material adverse effect on our results of operations” for additional information.

The Oil Pollution Act. The U.S. Oil Pollution Act of 1990 (“OPA”) and similar regulations, including but not limited to the International Convention for the Prevention of Pollution from Ships (“MARPOL”), adopted by the International Maritime Organization (“IMO”), as enforced in the United States through the domestic implementing law called the Act to Prevent Pollution from Ships, impose certain operational requirements on offshore rigs operating in the U.S. and govern liability for leaks, spills and blowouts involving pollutants. OPA imposes strict, joint and several liabilities on “responsible parties” for damages, including natural resource damages, resulting from oil spills into or upon navigable waters, adjoining shorelines or in the exclusive economic zone of the United States. A “responsible party” includes the owner or operator of an onshore facility and the lessee or permit holder of the area in which an offshore facility is located.

Regulations under OPA require owners and operators of rigs in United States waters to maintain certain levels of financial responsibility. The failure to comply with OPA’s requirements may subject a responsible party to civil, criminal, or administrative enforcement actions. We are not aware of any action or event that would subject us to liability under OPA, and we believe that compliance with OPA’s financial assurance and other operating requirements will not have a material impact on our operations or financial condition.

Waste Handling. The U.S. Resource Conservation and Recovery Act (“RCRA”), and similar state, local and foreign laws and regulations govern the management of wastes, including the treatment, storage and disposal of hazardous wastes. RCRA imposes stringent operating requirements, and liability for failure to meet such requirements, on a person who is either a “generator” or “transporter” of hazardous waste or an “owner” or “operator” of a hazardous waste treatment, storage or disposal facility. RCRA and many state counterparts specifically exclude from the definition of hazardous waste drilling fluids, produced waters, and other wastes associated with the exploration, development, or production of crude oil and natural gas. As a result, our operations generate minimal quantities of RCRA hazardous wastes. We do not believe the current costs of managing our wastes, as they are presently classified, to be significant. However, any repeal or modification of this or similar exemption in similar state statutes, would increase the volume of hazardous waste we are required to manage and dispose of, and would cause us, as well as our competitors, to incur increased operating expenses with respect to our U.S. operations.

Water Discharges. The U.S. Federal Water Pollution Control Act of 1972, as amended, also known as the “Clean Water Act,” and similar state laws and regulations impose restrictions and controls on the discharge of pollutants into federal and state waters. These laws also regulate the discharge of storm water in process areas. Pursuant to these laws and regulations, we are required to obtain and maintain approvals or permits for the discharge of wastewater and storm water. In addition, the U.S. Coast Guard has promulgated requirements for ballast water management as well as supplemental ballast water requirements, which include limits applicable to specific discharge streams, such as deck runoff, bilge water and gray water. We do not anticipate that compliance with these laws will cause a material impact on our operations or financial condition.

Air Emissions. The U.S. Federal Clean Air Act and associated state laws and regulations restrict the emission of air pollutants from many sources, including oil and natural gas operations. New facilities may be required to obtain permits before operations can commence, and existing facilities may be required to obtain additional permits, and incur capital costs, in order to remain in compliance. Federal and state regulatory agencies can impose administrative, civil and criminal penalties for non-compliance with air permits or other requirements of the Clean Air Act and associated state laws and regulations. In general, we believe that compliance with the Clean Air Act and similar state laws and regulations will not have a material impact on our operations or financial condition.

Climate Change.There is increasing attention concerning the issue of climate change and the effect of greenhouse gas (“GHG”) emissions. The United States Environmental Protection Agency (“EPA”) regulates the permitting of GHG emissions from stationary sources under the Clean

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Air Act’s Prevention of Significant Deterioration (“PSD”) and Title V permitting programs, which require the use of “best available control technology” for GHG emissions from new and modified major stationary sources, which can sometimes include drillships. The EPA has also adopted rules requiring the monitoring and reporting of GHG emissions from specified sources in the United States, including, among other things, certain onshore and offshore oil and natural gas production facilities, on an annual basis.

Moreover, in 2005, the Kyoto Protocol to the 1992 United Nations Framework Convention on Climate Change, which establishes a binding set of emission targets for GHGs, became binding on all countries that had ratified it. In 2015, the United Nations Climate Change Conference in Paris resulted in the creation of the Paris Agreement. The Paris Agreement requires countries to review and “represent a progression” in their nationally determined contributions, which set emissions reduction goals, every five years beginning in 2020. Incentives to conserve energy or use alternative energy sources could have a negative impact on our business if such incentives reduce the worldwide demand for oil and gas. See “Risk Factors— Governmental laws and regulations may add to our costs, result in delays, or limit our drilling activity” for additional information.

Countries in the European Union (“EU”) implement the U.N.’s Kyoto Protocol on GHG emissions through the Emissions Trading System (“ETS”), though ETS will continue to require GHG reductions in the future that are not currently prescribed by the Kyoto Protocol or related agreements. The ETS program establishes a GHG “cap and trade” system for certain industry sectors, including power generation at some offshore facilities. Total GHG from these sectors is capped, and the cap is reduced over time to achieve a 21 percent GHG reduction from these sectors between 2005 and 2020.

In addition, the United Kingdom (“UK”) government, which implements ETS in the UK North Sea, has introduced a carbon price floor mechanism to place an incrementally increasing minimum price on carbon. Thus, the cost of compliance with ETS can be expected to increase over time. Additional member state climate change legislation may result in potentially material capital expenditures.

We have determined that combustion of diesel fuel (Scope 1) aboard all of our vessels worldwide is the Company’s primary source of GHG emissions, including carbon dioxide, methane and nitrous oxide. The data necessary to report indirect emissions from generation of purchased power (Scope 2) has not been previously collected. We will establish the necessary procedures to collect and report Scope 2 data.

For the year ended December 31, 2017, our estimated carbon dioxide equivalent (“CO2e”) gas emissions were 918,439 tonnes as compared to 985,384 tonnes for the year ended December 31, 2016. When expressed as an intensity measure of tonnes of CO2e gas emissions per dollar of contract drilling revenues from continuing operations, the intensity measure for December 31, 2017 and 2016 was .0008 and .0004, respectively. The increase in emissions is due to the Noble Lloyd Noble operating for the full year of 2017, as well as the Noble Tom Madden and Noble Sam Croft activating and now include helicopter emissions.

Our Scope 1 CO2e gas emissions reporting has been prepared with reference to the requirements set out in the UK Companies Act 2006 Regulations 2013, the Environmental Reporting Guidelines (June 2013) issued by the Department for Environment Food & Rural Affairs, the World Resources Institute and World Business Council for Sustainable Development GHG Protocol Corporate Accounting and Reporting Standard Revised and the International Organization for Standardization (“ISO”) 14064-1, “Specification with guidance at the organizational level for quantification and reporting of greenhouse gas emissions and removals (2006).” We have used SANGEA™ Emissions Estimation Software to estimate CO2e gas of Scope 1 emissions based on diesel fuel consumption.

It is our intent to have the procedures related to GHG emissions independently assessed in the future.

Worker Safety. The U.S. Occupational Safety and Health Act (“OSHA”) and other similar laws and regulations govern the protection of the health and safety of employees. The OSHA hazard communication standard, EPA community right-to-know regulations under Title III of CERCLA and similar state statutes require that information be maintained about hazardous materials used or produced in our operations and that this information be provided to employees, state and local governments and citizens. EU member states have also adopted regulations pursuant to EU Directive 2013/30/EU, on the safety of offshore oil and gas operations within the exclusive economic zone (which can extend up to 200 nautical miles from a coast) or the continental shelf. We believe that we are in substantial compliance with OSHA requirements and EU directive 2013/30/EU (as well as the extensive current health and safety regimes implemented in the member states in which we operate), but future developments could require the Company to incur significant costs to comply with the directive's implementation.

International Regulatory Regime.The IMO provides international regulations governing shipping and international maritimetrade. IMO regulations have been widely adopted by U.N. member countries, and in some jurisdictions in which we operate, these regulations have been expanded upon. The requirements contained in the International Management Code for the Safe Operation of Ships and for Pollution Prevention, or ISM Code, promulgated by the IMO, govern much of our drilling operations. Among other requirements, the ISM Code requires the party with operational control of a vessel to develop an extensive safety management systemthat includes, among other things, the adoption of a safety and environmental protection policy setting forth instructions and procedures for operating its vessels safely and describing procedures for responding to emergencies.

The IMO has also adopted MARPOL, including Annex VI to MARPOL which sets limits on sulfur dioxide and nitrogen oxide emissions from ship exhausts and prohibits deliberate emissions of ozone depleting substances. The IMO has also negotiated international conventions that

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impose liability for oil pollution in international waters and the territorial waters of the signatory to such conventions such as the Ballast Water Management Convention, (the “BWM Convention”) and the International Convention for Civil Liability for Bunker Oil Pollution Damage of 2001 (the “Bunker Convention”). The BWM Convention's implementing regulations call for a phased introduction of mandatory ballast of water exchange requirements (beginning in 2009), to be replaced in time with a requirement for mandatory ballast water treatment. The Bunker Convention provides a liability, compensation and compulsory insurance system for the victims of oil pollution damage caused by spills of bunker oil. We believe that all of our drilling rigs are currently compliant in all material respects with these regulations. However, the IMO continues to review and introduce new regulations. It is impossible to predict what additional regulations, if any, may be passed by the IMO and what effect, if any, such regulation may have on our operations.

Insurance and Indemnification Matters

Our operations are subject to many hazards inherent in the drilling business, including blowouts, fires, collisions, groundings, punch-throughs, and damage or loss from adverse weather and sea conditions. These hazards could cause personal injury or loss of life, loss of revenues, pollution and other environmental damage, damage to or destruction of property and equipment and oil and natural gas producing formations, and could result in claims by employees, customers or third parties and fines and penalties.

Our drilling contracts provide for varying levels of indemnification from our customers and in most cases also require us to indemnify our customers for certain losses. Under our drilling contracts, liability with respect to personnel and property is typically assigned on a “knock-for-knock” basis, which means that we and our customers assume liability for our respective personnel and property, generally irrespective of the fault or negligence of the party indemnified. In addition, our customers may indemnify us in certain instances for damage to our down-hole equipment and, in some cases, our subsea equipment. Also, we generally obtain a mutual waiver of consequential losses in our drilling contracts.

Our customers typically assume responsibility for and indemnify us from loss or liability resulting from pollution or contamination, including third-party damages and clean-up and removal, arising from operations under the contract and originating below the surface of the water. We are generally responsible for pollution originating above the surface of the water and emanating from our drilling units. Additionally, our customers typically indemnify us for liabilities incurred as a result of a blow-out or cratering of the well and underground reservoir loss or damage. In the current market, we are under increasing pressure to accept exceptions to the above-described allocations of risk and, as a result, take on more risk. In such cases where we agree, we generally limit the exposure with a monetary cap and other restrictions.

In addition to the contractual indemnities described above, we also carry Protection and Indemnity (“P&I”) insurance, which is a comprehensive general liability insurance program covering liability resulting from offshore operations. Our P&I insurance includes coverage for liability resulting from personal injury or death of third parties and our offshore employees, third-party property damage, pollution, spill clean-up and containment and removal of wrecks or debris. Our P&I insurance program is renewed in April of each year and currently has a standard deductible of $10 million per occurrence, with maximum liability coverage of $750 million. We also carry hull and machinery insurance that protects us against physical loss or damage to our drilling rigs, subject to a deductible that is currently $25 million.

Our insurance policies and contractual rights to indemnity may not adequately cover our losses and liabilities in all cases. For additional information, please read “We may have difficulty obtaining or maintaining insurance in the future and our insurance coverage and contractual indemnity rights may not protect us against all the risks and hazards we face” included in Part I, Item 1A, “Risk Factors” of this Annual Report on Form 10-K.

The above description of our insurance program and the indemnification provisions of our drilling contracts is only a summary as of the time of preparation of this report, and is general in nature. Our insurance program and the terms of our drilling contracts may change in the future. In addition, the indemnification provisions of our drilling contracts may be subject to differing interpretations, and enforcement of those provisions may be limited by public policy and other considerations.

Financial Information about Segments and Geographic Areas

Information regarding our operating revenues and identifiable assets attributable to each of our geographic areas of operations for the last three fiscal years is presented in Part II, Item 8, “Financial Statements and Supplementary Data, Note 15— Segment and Related Information.” Information regarding our risks attendant to foreign operations and our dependence upon such foreign operations is presented in Part I, Item 1A, “Risk Factors— We are exposed to risks relating to operations in international locations.”

Available Information

Our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the U.S. Securities Exchange Act of 1934 are available free of charge at our website at http://www.noblecorp.com. These filings are also available to the public at the U.S. Securities and Exchange Commission’s (the “SEC”) Public Reference

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Room at 100 F Street, NE, Room 1580, Washington, DC 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. Electronic filings with the SEC are also available on the SEC’s website at http://www.sec.gov.

You may also find information related to our corporate governance, board committees and company code of ethics (and any amendments or waivers of compliance) at our website. Among the documents you can find there are the following:

• Articles of Association;

• Code of Business Conduct and Ethics;

• Corporate Governance Guidelines;

• Audit Committee Charter;

• Compensation Committee Charter;

• Health, Safety, Environment and Engineering Committee Charter;

• Nominating and Corporate Governance Committee Charter; and

• Finance Committee Charter.

Item 1A. Risk Factors.

You should carefully consider the following risk factors in addition to the other information included in this Annual Report on Form 10-K. Each of these risk factors could affect our business, operating results and financial condition, as well as affect an investment in our shares.

Our business and results of operations have been materially hurt and our enterprise value has substantially declined due to current depressed market conditions which are the result of the dramatic drop in the oil price and the oversupply of offshore drilling rigs.

Crude oil prices have declined from approximately $112 per barrel for Brent crude on June 30, 2014 to as low as approximately $30 per barrel in January 2016, before improving to approximately $65 per barrel on February 20, 2018. In addition, a large number of offshore drilling rigs were constructed and added to the global fleet in the last few years, and a substantial number of additional rigs, including rigs built on speculation, are available and could enter the market in 2018. Also, many in our industry extended the lives of older rigs rather than retiring these rigs. These factors have led to a significant oversupply of drilling rigs at the same time that our customers have greatly reduced their planned exploration and development spending in response to the depressed price of oil. These factors have affected market conditions and led to a material decline in the demand for our services, the dayrates we are paid by our customers and the level of utilization of our drilling rigs. These poor market conditions, in turn, have led to a material deterioration in our results of operations. We have already experienced a substantial decline in the price of our shares, which has declined from $27 on August 4, 2014 post Spin-off to $4 at February 20, 2018. While the offshore contract drilling industry is highly cyclical and has experienced periods of low demand and higher demand, there can be no assurance as to when or to what extent the current depressed market conditions, and our business, results of operations or enterprise value, will improve. Further, even if the price of oil and gas were to increase dramatically, we cannot assure you that there would be any increase in demand for our services.

Our business depends on the level of activity in the oil and gas industry. Adverse developments affecting the industry, including a decline in the price of oil or gas, reduced demand for oil and gas products and increased regulation of drilling and production, could have a material adverse effect on our business, financial condition and results of operations.

Demand for drilling services depends on a variety of economic and political factors and the level of activity in offshore oil and gas exploration and development and production markets worldwide. As noted above, the price of oil and gas, and market expectations of potential changes in the price, significantly affect this level of activity, as well as dayrates which we can charge customers for our services. However, higher prices do not necessarily translate into increased drilling activity because our clients’ expectations of future commodity prices typically drive demand for our rigs. The price of oil and gas and the level of activity in offshore oil and gas exploration and development are extremely volatile and are affected by numerous factors beyond our control, including:

• the cost of exploring for, developing, producing and delivering oil and gas;

• the ability of OPEC to set and maintain production levels and pricing;

• expectations regarding future energy prices;

• increased supply of oil and gas resulting from onshore hydraulic fracturing activity and shale development;

• worldwide production and demand for oil and gas, which are impacted by changes in the rate of economic growth in the global economy;

• potential acceleration in the development, and the price and availability, of alternative fuels;

• the level of production in non-OPEC countries;

• worldwide financial instability or recessions;

• regulatory restrictions or any moratorium on offshore drilling;

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• the discovery rate of new oil and gas reserves either onshore or offshore;

• the rate of decline of existing and new oil and gas reserves;

• available pipeline and other oil and gas transportation capacity;

• oil refining capacity;

• the ability of oil and gas companies to raise capital;

• worldwide instability in the financial and credit sectors and a reduction in the availability of liquidity and credit;

• the relative cost of offshore oil and gas exploration versus onshore oil and gas production;

• advances in exploration, development and production technology either onshore or offshore;

• technical advances affecting energy consumption, including the displacement of hydrocarbons through increasing transportation fuel efficiencies;

• merger and divestiture activity among oil and gas producers;

• the availability of, and access to, suitable locations from which our customers can produce hydrocarbons;

• adverse weather conditions, including hurricanes, typhoons, winter storms and rough seas;

• tax laws, regulations and policies;

• laws and regulations related to environmental matters, including those addressing alternative energy sources and the risks of global climate change;

• the political environment of oil-producing regions, including uncertainty or instability resulting from civil disorder, an outbreak or escalation of armed hostilities or acts of war or terrorism; and

• the laws and regulations of governments regarding exploration and development of their oil and gas reserves or speculation regarding future laws or regulations.

Adverse developments affecting the industry as a result of one or more of these factors, including any further decline in the price of oil and gas from their current levels or the failure of the price of oil and gas to recover to a level that encourages our clients to expand their capital spending, a global recession, reduced demand for oil and gas products, increased supply due to the development of new onshore drilling and production technologies, and increased regulation of drilling and production, particularly if several developments were to occur in a short period of time, would have a material adverse effect on our business, financial condition and results of operations. The current downturn has had a material adverse effect on demand for our services since 2015 and is expected to continue to have a material adverse effect on our business and results of operations.

The contract drilling industry is a highly competitive and cyclical business with intense price competition. If we are unable to compete successfully, our profitability may be materially reduced.

The offshore contract drilling industry is a highly competitive and cyclical business characterized by high capital and operating costs and evolving capability of newer rigs. Drilling contracts are traditionally awarded on a competitive bid basis. Price competition, rig availability, location and rig suitability and technical specifications are the primary factors in determining which contractor is awarded a job, although other factors are important, including experience of the workforce, efficiency, safety performance record, condition of equipment, operating integrity, reputation, industry standing and client relations. Our future success and profitability will partly depend upon our ability to keep pace with our customers’ demands with respect to these factors. If current competitors, or new market entrants, implement new technical capabilities, services or standards that are more attractive to our customers or price their product offerings more competitively, it could have a material adverse effect on our business, financial condition and results of operations.

In addition to intense competition, our industry has historically been cyclical. The contract drilling industry is currently in a period characterized by low demand for drilling services and excess rig supply. Periods of low demand or excess rig supply intensify the competition in the industry and have resulted in, and are expected to continue to result in, many of our rigs being idle or earning substantially lower dayrates for long periods of time. We cannot provide you with any assurances as to when such period will end, or when there will be higher demand for contract drilling services or a reduction in the number of drilling rigs.

The over-supply of rigs is contributing to a reduction in dayrates and demand for our rigs, which reduction may continue for some time and, therefore, is expected to further adversely impact our revenues and profitability.

Prior to the current downturn, we experienced an extended period of high utilization and high dayrates, and industry participants materially increased the supply of drilling rigs by building new drilling rigs, including some that have not yet entered service. This increase in supply, combined with the decrease in demand for drilling rigs resulting from the substantial decline in the price of oil that began in late 2014, has resulted in an oversupply of drilling rigs, which has contributed to the decline in utilization and dayrates.

We are currently experiencing competition from newbuild rigs that have either already entered the market or are available to enter the market. The entry of these rigs into the market has resulted in lower dayrates for both newbuilds and existing rigs rolling off their current contracts. Lower utilization and dayrates have adversely affected our revenues and profitability and may continue to do so for some time in the future. In addition, our competitors may relocate rigs to geographic markets in which we operate, which could exacerbate excess rig supply and result in

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lower dayrates and utilization in those markets. To the extent that the drilling rigs currently under construction or on order do not have contracts upon their completion, there may be increased price competition as such vessels become operational, which could lead to a further reduction in dayrates and in utilization, and we may be required to idle additional drilling rigs. As a result, our business, financial condition and results of operations would be materially adversely affected.

We may record impairment charges on property and equipment, including rigs and related capital spares.

We evaluate the impairment of property and equipment, which include rigs and related capital spares, whenever events or changes in circumstances (including a decision to cold stack, retire or sell rigs) indicate that the carrying amount of an asset may not be recoverable. An impairment loss on our property and equipment may exist when the estimated undiscounted cash flows expected to result from the use of the asset and its eventual disposition are less than its carrying amount. Any impairment loss recognized represents the excess of the asset’s carrying value over the estimated fair value. As part of this analysis, we make assumptions and estimates regarding future market conditions. To the extent actual results do not meet our estimated assumptions, for a given rig or piece of equipment,we may take an impairment loss in the future. In addition, we may also take an impairment loss on capital spares and other capital equipment when we deem the value of those items has declined due to factors like obsolescence, deterioration or damage. For example, based upon our impairment analysis as of the years ended December 31, 2017 and 2016, we decided that we would no longer market certain rigs. In connection with these decisions, we recorded impairment charges of $121.6 million and $285.0 million, respectively, on these rigs and certain capital spares during those periods. There can be no assurance that we will not have to take additional impairment charges in the future if current depressed market conditions persist.

We may not be able to renew or replace expiring contracts, and our customers may terminate or seek to renegotiate or repudiate our drilling contracts or may have financial difficulties which prevents them from meeting their obligations under our drilling contracts.

We had a number of customer contracts that expired in 2016 and 2017 and will expire in 2018. Generally speaking we were not able to renew or replace contracts that expired in 2016 and 2017 on as favorable terms as our previous contracts, if at all, and our ability to renew contracts that expire in 2018 or obtain new contracts and the terms of any such contracts will depend on market conditions and our customers' expectations and assumptions of future oil prices and other factors. During 2016 and 2017, a number of oil and gas companies, including some of our customers, publicly announced significant reductions in their planned exploration and development spending affecting the offshore market, and some of our customers may continue to do so in 2018. These reductions in spending by our customers could further reduce the demand for contract drilling services and as a result, our business, financial condition and results of operations would be materially adversely affected.

Our customers may generally terminate our term drilling contracts if a drilling rig is destroyed or lost or if we have to suspend drilling operations for a specified period of time as a result of a breakdown of major equipment or, in some cases, due to other events beyond the control of either party. In the case of nonperformance and under certain other conditions, our drilling contracts generally allow our customers to terminate without any payment to us. The terms of some of our drilling contracts permit the customer to terminate the contract after a specified notice period by tendering contractually specified termination amounts and, in some cases, without any payment. These termination payments, if any, may not fully compensate us for the loss of a contract. The early termination of a contract may result in a rig being idle for an extended period of time and a reduction in our contract backlog and associated revenue, which could have a material adverse effect on our business, financial condition and results of operations.

In addition, during periods of depressed market conditions, such as the one we are currently experiencing, we are subject to an increased risk of our customers seeking to renegotiate or repudiate their contracts. The ability of our customers to perform their obligations under drilling contracts with us may also be adversely affected by the financial condition of the customer, restricted credit markets, economic downturns and industry downturns. We may elect to renegotiate the rates we receive under our drilling contracts downward if we determine that to be a reasonable business solution. If our customers cancel or are unable to perform their obligations under their drilling contracts, including their payment obligations, and we are unable to secure new contracts on a timely basis on substantially similar terms or if we elect to renegotiate our drilling contracts and accept terms that are less favorable to us, it could have a material adverse effect on our business, financial condition and results of operations.

Our current backlog of contract drilling revenue may not be ultimately realized.

Generally, contract backlog only includes future revenues under firm commitments; however, from time to time, we may report anticipated commitments under letters of intent or award for which definitive agreements have not yet been, but are expected to be, executed. We may not be able to perform under these contracts as a result of operational or other breaches or due to events beyond our control, and we may not be able to ultimately execute a definitive agreement in cases where one does not currently exist. Moreover, we can provide no assurance that our customers will be able to or willing to fulfill their contractual commitments to us or that they will not seek to renegotiate or repudiate their contracts, especially during the current industry downturn. In estimating backlog, we make certain assumptions about applicable dayrates for our longer-term contracts with dayrate adjustment mechanisms (like certain of our contracts with Shell). While we believe these assumptions are appropriate, we cannot assure you that actual results will mirror these assumptions. Our inability to perform under our contractual obligations or to execute definitive

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agreements, our customers’ inability or unwillingness to fulfill their contractual commitments to us, including as a result of contract repudiations or our decision to accept less favorable terms on our drilling contracts, or the failure of actual results to reflect the assumptions we use to estimate backlog for certain contracts, may have a material adverse effect on our business, financial condition and results of operations.

We are substantially dependent on several of our customers, including Shell, Statoil and Saudi Aramco, and the loss of any of these customers would have a material adverse effect on our financial condition and results of operations.

Any concentration of customers increases the risks associated with any possible termination or nonperformance of drilling contracts, failure to renew contracts or award new contracts or reduction of their drilling programs. Shell, Statoil and Saudi Aramco accounted for approximately 45 percent, 13 percent and 11 percent, respectively, of our consolidated operating revenues and approximately 58 percent, 14 percent and 19 percent, respectively, of our backlog for the year ended December 31, 2017. This concentration of customers increases the risks associated with any possible termination or nonperformance of contracts, in addition to our exposure to credit risk. If any of these customers were to terminate or fail to perform their obligations under their contracts and we were not able to find other customers for the affected drilling units promptly, our financial condition and results of operations could be materially adversely affected.

Paragon Offshore has formed and funded a litigation trust as part of its bankruptcy proceedings and the litigation trust has filed claims against us and certain of our officers and directors. In addition, Paragon Offshore has rejected in the bankruptcy proceedings certain separation agreements entered into with us, and as a result, we will be responsible for those liabilities for which we would have otherwise sought indemnification under the separation agreements.

In August 2014, we completed the Spin-off of a majority of our standard specification offshore drilling business through a pro rata distribution of all of the ordinary shares of our wholly-owned subsidiary, Paragon Offshore, to the holders of our ordinary shares. In April 2017, Paragon Offshore filed a bankruptcy plan (the “Plan”). The Plan, which was modified in May 2017, provided for the creation of a litigation trust to which Paragon Offshore transferred its claims against us, including claims of alleged fraudulent conveyance in connection with the Spin-off and the funding of the trust by Paragon Offshore with $10.0 million. The litigation trust is entitled to pursue those claims against us. In June 2017, the revised Plan was approved by the bankruptcy court and Paragon Offshore emerged from bankruptcy on July 18, 2017.

On December 15, 2017, the litigation trust filed claims relating to the Spin-off against us and certain of our current and former officers and directors in the Delaware bankruptcy court that heard Paragon Offshore’s bankruptcy. The complaint alleges claims of alleged actual and constructive fraudulent conveyance, unjust enrichment and recharacterization of intercompany notes as equity claims against Noble and claims of breach of fiduciary duty and aiding and abetting breach of fiduciary duty against the officer and director defendants. If any of the litigation trust’s claims are successful, or if we elect to settle any claims, any damages or other amounts we would be required to or agree to pay could have a material adverse effect on our business, financial condition and results of operations. The litigation is in the very early stages, no schedule has been established, and we are not able to predict when, or if, the matters will go to trial or otherwise be concluded. We may be required to establish reserves on our financial statements in advance of the conclusion of the litigation. Such reserves may be substantial and could have a material adverse effect on our financial condition as presented in such financial statements.

We entered into certain separation agreements with Paragon Offshore at the time of the Spin-off (including the master separation agreement, tax sharing agreement, transition services agreement and transition services agreement relating to our operations offshore Brazil) under which we agreed to indemnify Paragon Offshore for certain liabilities, and Paragon Offshore agreed to indemnify us for certain liabilities. As part of the Plan, Paragon Offshore rejected all of these contracts. Accordingly, we are no longer entitled to seek indemnity from Paragon Offshore under such agreements, and we would be responsible for those liabilities for which we would have otherwise sought indemnification. Such liabilities could have a material adverse effect on our business, financial condition and results of operations.

Our business involves numerous operating hazards.

Our operations are subject to many hazards inherent in the drilling business, including:

• well blowouts;

• fires;

• collisions or groundings of offshore equipment and helicopter accidents;

• punch-throughs;

• mechanical or technological failures;

• failure of our employees or third-party contractors to comply with our internal environmental, health and safety guidelines;

• pipe or cement failures and casing collapses, which could release oil, gas or drilling fluids;

• geological formations with abnormal pressures;

• loop currents or eddies;

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• failure of critical equipment;

• toxic gas emanating from the well;

• spillage handling and disposing of materials; and

• adverse weather conditions, including hurricanes, typhoons, tsunamis, winter storms and rough seas.

These hazards could cause personal injury or loss of life, suspend drilling operations, result in regulatory investigation or penalties, seriously damage or destroy property and equipment, result in claims by employees, customers or third parties, cause environmental damage and cause substantial damage to oil and gas producing formations or facilities. Operations also may be suspended because of machinery breakdowns, abnormal drilling conditions, and failure of subcontractors to perform or supply goods or services or personnel shortages. The occurrence of any of the hazards we face could have a material adverse effect on our business, financial condition and results of operations.

We may experience downgrades in our credit ratings, which could increase our borrowing costs and potentially reduce our access to additional liquidity.

As a result of the decline in our credit ratings below investment grade in 2016, access to the commercial paper market became closed to us and we terminated our commercial paper program. So long as such access is closed, any future borrowings would have to be made under our Credit Facilities (as defined herein). Each of our Credit Facilities has a provision which changes the applicable interest rate based upon our credit ratings, and these reduced credit ratings have increased our potential interest expense for borrowings under our 2015 Credit Facility (as defined herein).

During 2016 and 2017, we experienced debt rating downgrades by Moody’s Investors Service and S&P Global Ratings, which reduced our debt ratings significantly below investment grade. As a result of these downgrades, we experienced interest rate increases during 2016 and 2017 on our Senior Notes due 2018 (the “2018 Notes”), our Senior Notes due 2025 (the “2025 Notes”) and our Senior Notes due 2045 (the “2045 Notes”), all of which are subject to provisions that vary the applicable interest rates based on our debt rating. On October 18, 2017, S&P Global Ratings further reduced our debt rating, which will increase the interest rates on the 2025 Notes and the 2045 Notes to 7.95% and 8.95%, respectively, beginning in April 2018. Once the new interest rates take effect in April 2018, these senior notes will have reached the contractually-defined maximum interest rate set for each rating agency and no further interest rate increase will occur.

Our other outstanding senior notes, including the Senior Notes due 2024 (the “2024 Notes”) issued in December 2016, and the Senior Notes due 2026 (the “2026 Notes”) issued in January 2018, do not contain provisions varying applicable interest rates based upon our credit ratings.

We are exposed to risks relating to operations in international locations.

We operate in various regions throughout the world that may expose us to political and other uncertainties, including risks of:

• seizure, nationalization or expropriation of property or equipment;

• monetary policies, government credit rating downgrades and potential defaults, and foreign currency fluctuations and devaluations;

• limitations on the ability to repatriate income or capital;

• complications associated with repairing and replacing equipment in remote locations;

• repudiation, nullification, modification or renegotiation of contracts;

• limitations on insurance coverage, such as war risk coverage, in certain areas;

• import-export quotas, wage and price controls, imposition of trade barriers and other forms of government regulation and economic conditions that are beyond our control;

• delays in implementing private commercial arrangements as a result of government oversight;

• financial or operational difficulties in complying with foreign bureaucratic actions;

• changing taxation rules or policies;

• other forms of government regulation and economic conditions that are beyond our control and that create operational uncertainty;

• governmental corruption;

• piracy; and

• terrorist acts, war, revolution and civil disturbances.

Further, we operate in certain less-developed countries with legal systems that are not as mature or predictable as those in more developed countries, which can lead to greater uncertainty in legal matters and proceedings. Examples of challenges of operating in these countries include:

• procedural requirements for temporary import permits, which may be difficult to obtain;

• the effect of certain temporary import permit regimes, where the duration of the permit does not coincide with the general term of the drilling contract; and

• ongoing claims in Brazil related to withholding taxes payable on our service contracts.

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Our ability to do business in a number of jurisdictions is subject to maintaining required licenses and permits and complying with applicable laws and regulations. Changes in, compliance with, or our failure to comply with the laws and regulations of the countries where we operate may negatively impact our operations in those countries and could have a material adverse effect on our results of operations.

In addition, OPEC initiatives, as well as other governmental actions, may continue to cause oil price volatility. In some areas of the world, this governmental activity has adversely affected the amount of exploration and development work done by major oil companies, which may continue. In addition, some governments favor or effectively require the awarding of drilling contracts to local contractors, require use of a local agent, require partial local ownership or require foreign contractors to employ citizens of, or purchase supplies from, a particular jurisdiction. These practices may adversely affect our ability to compete and our results of operations.

Operating and maintenance costs of our rigs may be significant and may not correspond to revenue earned.

Our operating expenses and maintenance costs depend on a variety of factors including: crew costs, costs of provisions, equipment, insurance, maintenance and repairs, and shipyard costs, many of which are beyond our control. Our total operating costs are generally related to the number of drilling rigs in operation and the cost level in each country or region where such drilling rigs are located. Equipment maintenance costs fluctuate depending upon the type of activity that the drilling rig is performing and the age and condition of the equipment. Operating and maintenance costs will not necessarily fluctuate in proportion to changes in operating revenues. While operating revenues may fluctuate as a function of changes in dayrate, costs for operating a rig may not be proportional to the dayrate received and may vary based on a variety of factors, including the scope and length of required rig preparations and the duration of the contractual period over which such expenditures are amortized. Any investments in our rigs may not result in an increased dayrate for or income from such rigs. A disproportionate amount of operating and maintenance costs in comparison to dayrates could have a material adverse effect on our business, financial condition and results of operations.

Drilling contracts with national oil companies may expose us to greater risks than we normally assume in drilling contracts with non-governmental clients.

Contracts with national oil companies are often non-negotiable and may expose us to greater commercial, political and operational risks than we assume in other contracts, such as exposure to materially greater environmental liability and other claims for damages (including consequential damages) and personal injury related to our operations, or the risk that the contract may be terminated by our client without cause on short-term notice, contractually or by governmental action, under certain conditions that may not provide us an early termination payment, collection risks and political risks. In addition, our ability to resolve disputes or enforce contractual provisions may be negatively impacted with these contracts. While we believe that the financial, commercial and risk allocation terms of these contracts and our operating safeguards mitigate these risks, we can provide no assurance that the increased risk exposure will not have an adverse impact on our future operations or that we will not increase the number of rigs contracted to national oil companies with commensurate additional contractual risks.

Governmental laws and regulations may add to our costs, result in delays, or limit our drilling activity.

Our business is affected by public policy and laws and regulations relating to the energy industry in the geographic areas where we operate.

The drilling industry is dependent on demand for services from the oil and gas exploration and production industry, and accordingly, we are directly affected by the adoption of laws and regulations that for economic, environmental or other policy reasons curtail exploration and development drilling for oil and gas. We may be required to make significant capital expenditures to comply with governmental laws and regulations. Governments in some foreign countries are increasingly active in regulating and controlling the ownership of concessions, the exploration for oil and gas, and other aspects of the oil and gas industries. There is increasing attention in the United States and worldwide concerning the issue of climate change and the effect of greenhouse gases, or GHGs. This increased attention may result in new environmental laws or regulations that may unfavorably impact us, our suppliers and our customers.

The modification of existing laws or regulations or the adoption of new laws or regulations that result in the curtailment of exploratory or developmental drilling for oil and gas could materially and adversely affect our operations by limiting drilling opportunities increasing our cost of doing business, discouraging our customers from drilling for hydrocarbons, disrupting revenue through permitting or similar delays, or subjecting us to liability.

As disclosed in Part II, Item 8, “Financial Statements and Supplementary Data, Note 14— Commitments and Contingencies,” in November 2012, the U.S. Coast Guard in Alaska conducted an inspection and investigation of the Noble Discoverer and the Kulluk, a rig we were providing contract labor services for, and referred the matters to the DOJ for further investigation. In December 2014, a subsidiary reached a settlement with the DOJ regarding its investigation of the Noble Discoverer and the Kulluk. Under the terms of the plea agreement, the subsidiary pled guilty to violations relating to maintaining proper oil record books for the Noble Discoverer and Kulluk, maintaining proper ballast records for the Noble Discoverer and notification of hazardous conditions with respect to the Noble Discoverer. The subsidiary paid $8.2 million in fines and $4 million in community service payments and implemented a comprehensive environmental compliance plan. Under the plea agreement, we were also placed on probation for four years, with the right to petition the court for early dismissal of probation after three years. We were granted our motion

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to terminate the plea agreement effective March 1, 2018. If, during the remaining term of probation, the subsidiary fails to adhere to the terms of the plea agreement, the DOJ may withdraw from the plea agreement and would be free to prosecute the subsidiary on all charges arising out of its investigation, including any charges dismissed pursuant to the terms of the plea agreement, as well as potentially other charges.

Any violation of anti-bribery or anti-corruption laws, including the Foreign Corrupt Practices Act, the United Kingdom Bribery Act, or similar laws and regulations could result in significant expenses, divert management attention, and otherwise have a negative impact on us.

We operate in countries known to have a reputation for corruption. We are subject to the risk that we, our affiliated entities or their respective officers, directors, employees and agents may take action determined to be in violation of such anti-corruption laws, including the U.S. Foreign Corrupt Practices Act of 1977 (the “FCPA”), the United Kingdom Bribery Act 2010 (the “U.K. Bribery Act”) and similar laws in other countries. Any violation of the FCPA, U.K. Bribery Act or other applicable anti-corruption laws could result in substantial fines, sanctions, civil and/or criminal penalties and curtailment of operations in certain jurisdictions and might adversely affect our business, results of operations or financial condition. In addition, actual or alleged violations could damage our reputation and ability to do business. Further, detecting, investigating and resolving actual or alleged violations is expensive and can consume significant time and attention of our senior management.

Changes in, compliance with, or our failure to comply with the certain laws and regulations may negatively impact our operations and could have a material adverse effect on our results of operations.

Our operations are subject to various laws and regulations in countries in which we operate, including laws and regulations relating to:

• the importing, exporting, equipping and operation of drilling rigs;

• currency exchange controls;

• oil and gas exploration and development;

• taxation of offshore earnings and earnings of expatriate personnel; and

• use and compensation of local employees and suppliers by foreign contractors.

Public and regulatory scrutiny of the energy industry has resulted in increased regulations being either proposed or implemented. In addition, existing regulations might be revised or reinterpreted, new laws, regulations and permitting requirements might be adopted or become applicable to us, our rigs, our customers, our vendors or our service providers, and future changes in laws and regulations could significantly increase our costs and could have a material adverse effect on our business, financial condition and results of operations. In addition, we may be required to post additional surety bonds to secure performance, tax, customs and other obligations relating to our rigs in jurisdictions where bonding requirements are already in effect and in other jurisdictions where we may operate in the future. These requirements would increase the cost of operating in these countries, which could materially adversely affect our business, financial condition and results of operations.

In response to the Macondo well blowout incident in April 2010, the U.S. Department of Interior, through the BOEM and BSEE, began an overhaul of the offshore oil and natural gas regulatory process that significantly impacted oil and gas development regulated by the United States. From time to time, new rules, regulations and requirements have been proposed and implemented by BOEM, BSEE or the United States Congress that could materially limit or prohibit, and increase the cost of, offshore drilling. For example, in July 2016, BOEM and BSEE finalized a rule revising and adding requirements for drilling on the U.S. Arctic Outer Continental Shelf. Similarly, in April 2016, BSEE announced a final blowout preventer systems and well control rule. However, in December 2017, BSEE published a proposed rule that would revise a number of the requirements in the blowout preventer systems and well control rule. BOEM also released a new Notice to Lessees and Operators in the Outer Continental Shelf ("NTL") in September 2016 that updates offshore bonding requirements. This update eliminates waivers of supplemental bonding and prohibits a company from relying on the financial strength of co-lessees unless co-lessees agree to allocate BOEM-determined self-insurance to the lease. In January 2017, BOEM extended the implementation timeline for the NTL by six months. In May 2017, the Secretary of the Interior directed BOEM to review the NTL and provide a report describing the results of the review and options for revising or rescinding the NTL. BOEM again extended the implementation timeline for the NTL in June 2017. If the NTL goes into effect, these new bonding requirements may increase our customers’ operating costs and impact our customers’ ability to obtain leases, thereby, reducing demand for our services. We are also subject to increasing regulatory requirements and scrutiny in the North Sea jurisdictions and other countries. These new rules, regulations and requirements, including the adoption of new safety requirements and policies relating to the approval of drilling permits, restrictions on oil and gas development and production activities in the U.S. Gulf of Mexico and elsewhere, implementation of safety and environmental management systems, mandatory third party compliance audits, and the promulgation of numerous Notices to Lessees or similar new regulatory requirements outside of theUnited States, have impacted and may continue to impact our operations by causing increased costs, delays and operational restrictions. In addition to these rules, regulations and requirements, the U.S. federal government is considering newlegislation that could impose additional equipment and safety requirements on operators and drilling contractors in the United States, as well as regulations relating to the protection of the environment. If the new regulations, policies, operating procedures and possibility of increased legal liability resulting from the adoption or amendment of rules and regulations applicable to our operations in the United States or other jurisdictions are viewed by our current or future customers as a significant

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impairment to expected profitability on projects, then they could discontinue or curtail their offshore operations in the impacted region, thereby adversely affecting our operations by limiting drilling opportunities or imposing materially increased costs.

Adverse effects may continue as a result of the uncertainty of ongoing inquiries, investigations and court proceedings, or additional inquiries and proceedings by federal or state regulatory agencies or private plaintiffs. In addition, we cannot predict the outcome of any of these inquiries or whether these inquiries will lead to additional legal proceedings against us, civil or criminal fines or penalties, or other regulatory action, including legislation or increased permitting requirements. Legal proceedings or other matters against us, including environmental matters, suits, regulatory appeals, challenges to our permits by citizen groups and similar matters, might result in adverse decisions against us. The result of such adverse decisions, both individually or in the aggregate, could be material and may not be covered fully or at all by insurance.

Operational interruptions or maintenance or repair work may cause our customers to suspend or reduce payment of dayrates until operation of the respective drilling rig is resumed, which may lead to loss of revenue or termination or renegotiation of the drilling contract.

If our drilling rigs are idle for reasons that are not related to the ability of the rig to operate, our customers are entitled to pay a waiting, or standby, rate lower than the full operational rate. In addition, if our drilling rigs are taken out of service for maintenance and repair for a period of time exceeding the scheduled maintenance periods set forth in our drilling contracts, we will not be entitled to payment of dayrates until the rig is able to work. Several factors could cause operational interruptions, including:

• breakdowns of equipment and other unforeseen engineering problems;

• work stoppages, including labor strikes;

• shortages of material and skilled labor;

• delays in repairs by suppliers;

• surveys by government and maritime authorities;

• periodic classification surveys;

• inability to obtain permits;

• severe weather, strong ocean currents or harsh operating conditions; and

• force majeure events.

If the interruption of operations were to exceed a determined period due to an event of force majeure, our customers have the right to pay a rate that is significantly lower than the waiting rate for a period of time, and, thereafter, may terminate the drilling contracts related to the subject rig. Suspension of drilling contract payments, prolonged payment of reduced rates or termination of any drilling contract as a result of an interruption of operations as described herein could materially adversely affect our business, financial condition and results of operations.

As a result of our significant cash flow needs, we may be required to incur additional indebtedness, and in the event of lost market access, may have to delay or cancel discretionary capital expenditures.

Our cash flow needs, both in the short-term and long-term, may include the following:

• normal recurring operating expenses;

• planned and discretionary capital expenditures; and

• repayment of debt and interest.

In the future, we may require funding for capital expenditures that is beyond the amount available to us from cash generated by our operations, cash on hand and borrowings under our existing Credit Facilities. We may raise such additional capital in a number of ways, including accessing capital markets, obtaining additional lines of credit or disposing of assets. However, we can provide no assurance that any of these options will be available to us on terms acceptable to us or at all.

Our debt instruments could limit our operations and our debt level may limit our flexibility to obtain financing and pursue business opportunities. Our ability to obtain financing or to access the capital markets may be limited by our financial condition and our credit ratings at the time of any such financing and the covenants in our existing debt agreements, as well as by adverse market conditions resulting from, among other things, a depressed oil price, general economic conditions and uncertainties that are beyond our control. Even if we are successful in obtaining additional capital through debt financings, incurring additional indebtedness may significantly increase our interest expense and may reduce our flexibility to respond to changing business and economic conditions or to fund working capital needs, because we will require additional funds to service our outstanding indebtedness.

We may delay or cancel discretionary capital expenditures, which could have certain adverse consequences, including delaying upgrades or equipment purchases that could make the affected rigs less competitive, adversely affect customer relationships and negatively impact our ability to contract such rigs.

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We may have difficulty obtaining or maintaining insurance in the future and our insurance coverage and contractual indemnity rights may not protect us against all the risks and hazards we face.

We do not procure insurance coverage for all of the potential risks and hazards we may face. Furthermore, no assurance can be given that we will be able to obtain insurance against all of the risks and hazards we face or that we will be able to obtain or maintain adequate insurance at rates and with deductibles or retention amounts that we consider commercially reasonable.

Our insurance carriers may interpret our insurance policies such that they do not cover losses for which we make claims. Our insurance policies may also have exclusions of coverage for some losses. Uninsured exposures may include expatriate activities prohibited by U.S. laws, radiation hazards, certain loss or damage to property onboard our rigs and losses relating to shore-based terrorist acts or strikes. Furthermore, the damage sustained to offshore oil and gas assets in the United States as a result of hurricanes has negatively impacted certain aspects of the energy insurance market, resulting in more restrictive and expensive coverage for U.S. named windstorm perils due to the price or lack of availability of coverage. Accordingly, we have in the past self-insured the rigs in the U.S. Gulf of Mexico for named windstorm perils. We currently have U.S. windstorm coverage for most of our U.S. fleet subject to limit, but will continue to monitor the insurance market conditions in the future and may decide not to, or be unable to, purchase named windstorm coverage for some or all of the rigs operating in the U.S. Gulf of Mexico.

Under our drilling contracts, liability with respect to personnel and property is customarily assigned on a “knock-for-knock” basis, which means that we and our customers assume liability for our respective personnel and property, irrespective of the fault or negligence of the party indemnified. Although our drilling contracts generally provide for indemnification from our customers for certain liabilities, including liabilities resulting from pollution or contamination originating below the surface of the water, enforcement of these contractual rights to indemnity may be limited by public policy and other considerations and, in any event, may not adequately cover our losses from such incidents. There can also be no assurance that those parties with contractual obligations to indemnify us will necessarily be in a financial position to do so. During depressed market periods such as the one in which we currently operate, the contractual indemnity provisions we are able to negotiate in our drilling contracts may require us to assume more risk than we would during normal market periods.

Although we maintain insurance in the geographic areas in which we operate, pollution, reservoir damage and environmental risks generally are not fully insurable. Our insurance policies may not adequately cover our losses or may have exclusions of coverage for some losses. We do not have insurance coverage or rights to indemnity for all risks, including loss of hire insurance on most of the rigs in our fleet. Uninsured exposures may include expatriate activities prohibited by U.S. laws and regulations, radiation hazards, cyber risks, certain loss or damage to property onboard our rigs and losses relating to shore-based terrorist acts or strikes. If a significant accident or other event occurs and is not fully covered by insurance or contractual indemnity, it could adversely affect our business, financial condition and results of operations.

Our information technology systems and those of our service providers are subject to cybersecurity risks and threats.

We depend on information technology systems that we manage, and others that are managed by our third-party service and equipment providers, to conduct our day-to-day operations, including critical systems on our drilling units, and these systems are subject to risks associated with cyber incidents or attacks. It has been reported that unknown entities or groups have mounted cyber-attacks on businesses and other organizations solely to disable or disrupt computer systems, disrupt operations and, in some cases, steal data. Due to the nature of cyber-attacks, breaches to our service or equipment providers’ systems could go unnoticed for a prolonged period of time. These cybersecurity risks could disrupt our operations and result in downtime, loss of revenue, or the loss, theft, corruption or unauthorized release of critical data of us or those with whom we do business as well as result in higher costs to correct and remedy the effects of such incidents. If our or our service or equipment providers’ systems for protecting against cyber incidents or attacks prove to be insufficient and an incident were to occur, it could have a material adverse effect on our business, financial condition, results of operations or cash flows. Currently, we do not carry insurance for losses related to cybersecurity attacks, and may elect to not obtain such insurance in the future.

A loss of a major tax dispute or a successful tax challenge to our operating structure, intercompany pricing policies or the taxable presence of our subsidiaries in certain countries could result in a higher tax rate on our worldwide earnings, which could result in a material adverse effect on our financial condition and results of operations.

Income tax returns that we file will be subject to review and examination. We will not recognize the benefit of income tax positions we believe are more likely than not to be disallowed upon challenge by a tax authority. If any tax authority successfully challenges our operational structure, intercompany pricing policies or the taxable presence of our subsidiaries in certain countries, if the terms of certain income tax treaties are interpreted in a manner that is adverse to our structure, or if we lose a material tax dispute in any country, our effective tax rate on our worldwide earnings could increase substantially and result in a material adverse effect on our financial condition.

Our consolidated effective income tax rate may vary substantially from one reporting period to another.

We cannot provide any assurances as to what our consolidated effective income tax rate will be because of, among other matters, uncertainty regarding the nature and extent of our business activities in any particular jurisdiction in the future and the tax laws of such jurisdictions, as well

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as potential changes in UK, U.S. and other foreign tax laws, regulations or treaties or the interpretation or enforcement thereof, changes in the administrative practices and precedents of tax authorities or any reclassification or other matter (such as changes in applicable accounting rules) that increases the amounts we have provided for income taxes or deferred tax assets and liabilities in our consolidated financial statements. In addition, as a result of frequent changes in the taxing jurisdictions in which our drilling rigs are operated and/or owned, changes in the overall level of our income and changes in tax laws, our consolidated effective income tax rate may vary substantially from one reporting period to another. Income tax rates imposed in the tax jurisdictions in which our subsidiaries conduct operations vary, as does the tax base to which the rates are applied. In some cases, tax rates may be applicable to gross revenues, statutory or negotiated deemed profits or other bases utilized under local tax laws, rather than to net income. Our drilling rigs frequently move from one taxing jurisdiction to another to perform contract drilling services. In some instances, the movement of drilling rigs among taxing jurisdictions will involve the transfer of ownership of the drilling rigs among our subsidiaries. If we are unable to mitigate the negative consequences of any change in law, audit, business activity or other matter, this could cause our consolidated effective income tax rate to increase and cause a material adverse effect on our financial position, operating results and/or cash flows.

Our operations are subject to numerous laws and regulations relating to the protection of the environment and of human health and safety, and compliance with these laws and regulations could impose significant costs and liabilities that exceed our current expectations.

Substantial costs, liabilities, delays and other significant issues could arise from environmental, health and safety laws and regulations covering our operations, and we may incur substantial costs and liabilities in maintaining compliance with such laws and regulations. Our operations are subject to extensive international conventions and treaties, and national or federal, state and local laws and regulations, governing environmental protection, including with respect to the discharge of materials into the environment and the security of chemical and industrial facilities. These laws govern a wide range of environmental issues, including:

• the release of oil, drilling fluids, natural gas or other materials into the environment;

• air emissions from our drilling rigs or our facilities;

• handling, cleanup and remediation of solid and hazardous wastes at our drilling rigs or our facilities or at locations to which we have sent wastes for disposal;

• restrictions on chemicals and other hazardous substances; and

• wildlife protection, including regulations that ensure our activities do not jeopardize endangered or threatened animals, fish and plant species, nor destroy or modify the critical habitat of such species.

Various governmental authorities have the power to enforce compliance with these laws and regulations and the permits issued under them, oftentimes requiring difficult and costly actions. Failure to comply with these laws, regulations and permits, or the release of oil or other materials into the environment, may result in the assessment of administrative, civil and criminal penalties, the imposition of remedial obligations, the imposition of stricter conditions on or revocation of permits, the issuance of moratoria or injunctions limiting or preventing some or all of our operations, delays in granting permits and cancellation of leases, or could affect our relationship with certain consumers.

There is an inherent risk of the incurrence of environmental costs and liabilities in our business, some of which may be material, due to the handling of our customers’ hydrocarbon products as they are gathered, transported, processed and stored, air emissions related to our operations, historical industry operations, and water and waste disposal practices. For example, we, as an operator of mobile offshore drilling units in navigable U.S. waters and certain offshore areas, including the U.S. Outer Continental Shelf, are liable for damages and for the cost of removing oil spills for which we may be held responsible, subject to certain limitations. Our operations may involve the use or handling of materials that are classified as environmentally hazardous. Environmental laws and regulations may expose us to liability for the conduct of or conditions caused by others or for acts that were in compliance with all applicable laws at the time they were performed. Joint, several or strict liability may be incurred without regard to fault under certain environmental laws and regulations for the remediation of contaminated areas and in connection with past, present or future spills or releases of natural gas, oil and wastes on, under, or from past, present or future facilities. Private parties may have the right to pursue legal actions to enforce compliance as well as to seek damages for non-compliance with environmental laws and regulations or for personal injury or property damage arising from our operations. In addition, increasingly strict laws, regulations and enforcement policies could materially increase our compliance costs and the cost of any remediation that may become necessary. Our insurance may not cover all environmental risks and costs or may not provide sufficient coverage if an environmental claim is made against us.

Our business may be adversely affected by increased costs due to stricter pollution control equipment requirements or liabilities resulting from non-compliance with required operating or other regulatory permits. Also, we might not be able to obtain or maintain from time to time all required environmental regulatory approvals for our operations. If there is a delay in obtaining any required environmental regulatory approvals, or if we fail to obtain and comply with them, the operation or construction of our facilities could be prevented or become subject to additional costs. In addition, the steps we could be required to take to bring certain facilities into regulatory compliance could be prohibitively expensive, and we might be required to shut down, divest or alter the operation of those facilities, which might cause us to incur losses.

We make assumptions and develop expectations about possible expenditures related to environmental conditions based on current laws and regulations and current interpretations of those laws and regulations. If the interpretation of laws or regulations, or the laws and regulations

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themselves, change, our assumptions may change, and new capital costs may be incurred to comply with such changes. In addition, new environmental laws and regulations might adversely affect our operations, as well as waste management and air emissions. For instance, governmental agencies could impose additional safety requirements, which could affect our profitability. Further, new environmental laws and regulations might adversely affect our customers, which in turn could affect our profitability.

Finally, although some of our drilling rigs will be separately owned by our subsidiaries, under certain circumstances a parent company and all of the unit-owning affiliates in a group under common control engaged in a joint venture could be held liable for damages or debts owed by one of the affiliates, including liabilities for oil spills under environmental laws. Therefore, it is possible that we could be subject to liability upon a judgment against us or any one of our subsidiaries.

Reactivation, refurbishment, conversion or upgrades of rigs are subject to risks, including delays and cost overruns, which could have an adverse impact on our available cash resources and results of operations.

We will continue to make upgrades, refurbishment and repair expenditures to our fleet from time to time, some of which may be unplanned. In addition, we may reactivate rigs that have been cold or warm stacked. Our customers may also require certain shipyard reliability upgrade projects for our rigs. These projects and other efforts of this type are subject to risks of cost overruns or delays inherent in any large construction project as a result of numerous factors, including the following:

• shortages of equipment, materials or skilled labor;

• work stoppages and labor disputes;

• unscheduled delays in the delivery of ordered materials and equipment;

• local customs strikes or related work slowdowns that could delay importation of equipment or materials;

• weather interferences;

• difficulties in obtaining necessary permits or approvals or in meeting permit or approval conditions;

• design and engineering problems;

• inadequate regulatory support infrastructure in the local jurisdiction;

• latent damages or deterioration to hull, equipment and machinery in excess of engineering estimates and assumptions;

• unforeseen increases in the cost of equipment, labor and raw materials, particularly steel;

• unanticipated actual or purported change orders;

• client acceptance delays;

• disputes with shipyards and suppliers;

• delays in, or inability to obtain, access to funding;

• shipyard availability, failures and difficulties, including as a result of financial problems of shipyards or their subcontractors; and

• failure or delay of third-party equipment vendors or service providers.

The failure to complete a rig reactivation, repair, upgrade, refurbishment or new construction on time, or at all, or the inability to complete a rig conversion or new construction in accordance with its design specifications, may result in loss of revenues, penalties, or delay, renegotiation or cancellation of a drilling contract or the recognition of an asset impairment. Additionally, capital expenditures for rig reactivation, repair, upgrade, refurbishment and construction projects could materially exceed our planned capital expenditures. Moreover, when our rigs are undergoing upgrade, refurbishment and repair, they may not earn a dayrate during the period they are out of service. If we experience substantial delays and cost overruns in our shipyard projects, it could have a material adverse effect on our business, financial condition and results of operations. We currently have no new rigs under construction.

Acts of terrorism, piracy and political and social unrest could affect the markets for drilling services, which may have a material adverse effect on our results of operations.

Acts of terrorism and social unrest, brought about by world political events or otherwise, have caused instability in the world’s financial and insurance markets in the past and may occur in the future. Such acts could be directed against companies such as ours. In addition, acts of terrorism, piracy and social unrest could lead to increased volatility in prices for crude oil and natural gas and could affect the markets for drilling services. Insurance premiums could increase and coverage may be unavailable in the future. Government regulations may effectively preclude us from engaging in business activities in certain countries. These regulations could be amended to cover countries where we currently operate or where we may wish to operate in the future.

Our drilling contracts do not generally provide indemnification against loss of capital assets or loss of revenues resulting from acts of terrorism, piracy or political or social unrest. We have limited insurance for our assets providing coverage for physical damage losses resulting from risks, such as terrorist acts, piracy, vandalism, sabotage, civil unrest, expropriation and acts of war, and we do not carry insurance for loss of revenues resulting from such risks.

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Failure to attract and retain skilled personnel or an increase in personnel costs could adversely affect our operations.

We require skilled personnel to operate and provide technical services and support for our drilling units. In the past, during periods of high demand for drilling services and increasing worldwide industry fleet size, shortages of qualified personnel have occurred. During periods of low demand, such as the one we are currently experiencing, there are layoffs of qualified personnel, who often find work with competitors or leave the industry.  As a result, once market conditions improve, we may face shortages of qualified personnel, which would impair our ability to attract qualified personnel for our new or existing drilling units, impair the timeliness and quality of our work and create upward pressure on personnel costs, any of which could adversely affect our operations.

Supplier capacity constraints or shortages in parts or equipment, supplier production disruptions, supplier quality and sourcing issues or price increases could increase our operating costs, decrease our revenues and adversely impact our operations.

Our reliance on third-party suppliers, manufacturers and service providers to secure equipment used in our drilling operations exposes us to volatility in the quality, price and availability of such items. Certain specialized parts and equipment we use in our operations may be available only from a single or small number of suppliers. A disruption in the deliveries from such third-party suppliers, capacity constraints, production disruptions, price increases, defects or quality-control issues, recalls or other decreased availability or servicing of parts and equipment could adversely affect our ability to meet our commitments to customers, adversely impact our operations and revenues by resulting in uncompensated downtime, reduced day rates or the cancellation or termination of contracts, or increase our operating costs.

Unionization efforts and labor regulations in certain countries in which we operate could materially increase our costs or limit our flexibility.

Certain of our employees and contractors in international markets are represented by labor unions or work under collective bargaining or similar agreements, which are subject to periodic renegotiation. Efforts may be made from time to time to unionize portions of our workforce. In addition, we may be subject to strikes or work stoppages and other labor disruptions in the future. Additional unionization efforts, new collective bargaining agreements or work stoppages could materially increase our costs, reduce our revenues or limit our operational flexibility.

Any failure to comply with the complex laws and regulations governing international trade could adversely affect our operations.

The shipment of goods, services and technology across international borders subjects our business to extensive trade laws and regulations. Import activities are governed by unique customs laws and regulations in each of the countries of operation. Moreover, many countries, including the United States, control the export and re-export of certain goods, services and technology and impose related export recordkeeping and reporting obligations. Governments also may impose economic sanctions against certain countries, persons and other entities that may restrict or prohibit transactions involving such countries, persons and entities. U.S. sanctions, in particular, are targeted against certain countries that are heavily involved in the petroleum and petrochemical industries, which includes drilling activities.

The laws and regulations concerning import activity, export recordkeeping and reporting, export control and economic sanctions are complex and constantly changing. These laws and regulations may be enacted, amended, enforced or interpreted in a manner materially impacting our operations. Shipments can be delayed and denied export or entry for a variety of reasons, some of which are outside our control and some of which may result from failure to comply with existing legal and regulatory regimes. Shipping delays or denials could cause unscheduled operational downtime. Any failure to comply with applicable legal and regulatory trading obligations could also result in criminal and civil penalties and sanctions, such as fines, imprisonment, debarment from government contracts, seizure of shipments and loss of import and export privileges.

Currently, we do not, nor do we intend to, operate in countries that are subject to significant sanctions and embargoes imposed by the U.S. government or identified by the U.S. government as state sponsors of terrorism, such as the Crimean region of the Ukraine, Cuba, Iran, North Korea, Sudan and Syria. The U.S. sanctions and embargo laws and regulations vary in their application, as they do not all apply to the same covered persons or proscribe the same activities, and such sanctions and embargo laws and regulations may be amended or strengthened over time. Although we believe that we will be in compliance with all applicable sanctions and embargo laws and regulations at the filing date, and intend to maintain such compliance, there can be no assurance that we will be in compliance in the future, particularly as the scope of certain laws may be unclear and may be subject to changing interpretations. Any such violation could result in fines or other penalties and could result in some investors deciding, or being required, to divest their interest, or not to invest, in us. In addition, certain institutional investors may have investment policies or restrictions that prevent them from holding securities of companies that have contracts with countries identified by the U.S. government as state sponsors of terrorism. In addition, our reputation and the market for our securities may be adversely affected if we engage in certain other activities, such as entering into drilling contracts with individuals or entities in countries subject to significant U.S. sanctions and embargo laws that are not controlled by the governments of those countries, or engaging in operations associated with those countries pursuant to contracts with third parties that are unrelated to those countries or entities controlled by their governments.

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Pension expenses associated with our retirement benefit plans may fluctuate significantly depending upon changes in actuarial assumptions, future investment performance of plan assets and legislative or other regulatory actions.

A portion of our current and retired employee population is covered by pension and other post-retirement benefit plans, the costs of which are dependent upon various assumptions, including estimates of rates of return on benefit plan assets, discount rates for future payment obligations, mortality assumptions, rates of future cost growth and trends for future costs. In addition, funding requirements for benefit obligations of our pension and other post-retirement benefit plans are subject to legislative and other government regulatory actions. Future changes in estimates and assumptions associated with our pension and other post-retirement benefit plans could have a material adverse effect on our financial condition, results of operations, cash flows and/or financial disclosures.

Fluctuations in exchange rates and nonconvertibility of currencies could result in losses to us.

We may experience currency exchange losses when revenues are received or expenses are paid in nonconvertible currencies, when we do not hedge an exposure to a foreign currency, when the result of a hedge is a loss or if any counterparty to our hedge were to experience financial difficulties. We may also incur losses as a result of an inability to collect revenues due to a shortage of convertible currency available to the country of operation, controls over currency exchange or controls over the repatriation of income or capital.

We are subject to litigation that could have an adverse effect on us.

We are, from time to time, involved in various litigation matters. These matters may include, among other things, contract disputes, personal injury claims, asbestos and other toxic tort claims, environmental claims or proceedings, employment matters, governmental claims for taxes or duties, and other litigation that arises in the ordinary course of our business. Although we intend to defend these matters vigorously, we cannot predict with certainty the outcome or effect of any claim or other litigation matter, and there can be no assurance as to the ultimate outcome of any litigation. Litigation may have an adverse effect on us because of potential negative outcomes, costs of attorneys, the allocation of management’s time and attention, and other factors.

We are a holding company, and we are dependent upon cash flow from subsidiaries to meet our obligations.

We currently conduct our operations through our subsidiaries, and our operating income and cash flow are generated by our subsidiaries. As a result, cash we obtain from our subsidiaries is the principal source of funds necessary to meet our debt service obligations. Unless they are guarantors of our indebtedness, our subsidiaries do not have any obligation to pay amounts due on our indebtedness or to make funds available for that purpose. Contractual provisions or laws, as well as our subsidiaries’ financial condition and operating requirements, may also limit our ability to obtain the cash that we require from our subsidiaries to pay our debt service obligations. Applicable tax laws may also subject such payments to us by our subsidiaries to further taxation.

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

Drilling Fleet

Noble is a leading offshore drilling contractor for the oil and gas sector. Noble owns and operates one of the most modern, versatile and technically advanced fleets of mobile offshore drilling units in the offshore drilling industry. Noble provides, through its subsidiaries, contract drilling services with a fleet of 28 offshore drilling units, consisting of eight drillships, six semisubmersibles and 14 jackups, focused largely on ultra-deepwater and high-specification drilling opportunities in both established and emerging regions worldwide. Each type of drilling rig is described further below. Several factors determine the type of unit most suitable for a particular job, the most significant of which include the water depth and the environment of the intended drilling location, whether the drilling is being done over a platform or other structure, and the intended well depth.

Drillships

A drillship is a type of floating drilling unit that is based on the ship-based hull of the vessel and equipped with modern drilling equipment that gives it the capability of easily transitioning from various worldwide locations and carrying high capacities of equipment while being able to drill ultra-deepwater oil and gas wells in up to 12,000 feet of water. Drillships can stay directly over the drilling location without anchors in open seas using a dynamic positioning system (“DPS”), which coordinates position references from satellite signals and acoustic seabed transponders with the drillship's six to eight thrusters to keep the ship directly over the well that is being drilled. Drillships are selected to drill oil and gas wells

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for programs that require a high level of simultaneous operations, where drilling loads are expected to be high, or where there are occurrences of high ocean currents, where the drillship's hull shape is the most efficient. There are currently eight drillships in Noble's fleet, capable of water depths from 8,200 feet to 12,000 feet.

Semisubmersibles

Semisubmersible drilling units are designed as a floating drilling platform incorporating one or several pontoon hulls, which are submerged in the water to lower the center of gravity and make this type of drilling unit exceptionally stable in the open sea. Semisubmersible drilling units are generally categorized in terms of the water depth in which they are capable of operating, from the mid-water range of 300 feet to 4,000 feet, the deepwater range of 4,000 feet to 7,500 feet, to the ultra-deepwater range of 7,500 feet to 12,000 feet as well as their generation, or date of construction. This type of drilling unit typically exhibits excellent stability characteristics, providing a stable platform for drilling in even rough seas. Semisubmersible drilling units hold their position over the drilling location using either an anchored mooring system or a DPS and may be self-propelled. Noble's fleet consists of six semisubmersible drilling units, three of which are equipped with mooring systems and three of which utilize DPS, with fleet diversity to operate in mid-water, deepwater and ultra-deepwater depth ranges with high levels of efficiency.

Jackups

Noble's fleet of modern, high-specification jackup drilling units give us the flexibility to provide drilling solutions to our customers who have drilling requirements in the shallower waters of the continental shelf, in depths ranging from less than 100 feet to as deep as 500 feet. Jackup rigs can be used in open water exploration locations, as well as over fixed, bottom-supported platforms. A jackup drilling unit is a towed mobile vessel consisting of a floating hull equipped with three or four legs, which are lowered to the seabed at the drilling location. The hull is then elevated out of the water by the jacking system using the legs to support weight of the hull and drilling equipment against the seabed. Once the hull is elevated to the desired level, or jacked up, the drilling package can be extended out over an existing production platform or the open water location and drilling can commence. Noble's fleet of 14 jackups varies from three standard units capable of drilling in up to 300 feet of water to premium and high-specification units capable of drilling in up to 500 feet of water with drilling hookloads greater than 2,500,000 pounds.

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Offshore Fleet

The following table presents certain information concerning our offshore fleet at February 15, 2018. We own and operate all of the units included in the table.

Name	Make	Year Built or Rebuilt (1)	Water Depth Rating (feet)	Drilling Depth Capacity (feet)	Location	Status (2)
Drillships—8
Noble Bob Douglas	GustoMSC P10000	2013 N	12,000	40,000	U.S. Gulf of Mexico	Active
Noble Bully I (3)	GustoMSC Bully PRD 12000	2011 N	8,200	40,000	Curaçao	Stacked
Noble Bully II (3)	GustoMSC Bully PRD 12000	2011 N	10,000	40,000	Singapore	Active
Noble Don Taylor	GustoMSC P10000	2013 N	12,000	40,000	U.S. Gulf of Mexico	Active
Noble Globetrotter I	Globetrotter Class	2011 N	10,000	30,000	U.S. Gulf of Mexico	Active
Noble Globetrotter II	Globetrotter Class	2013 N	10,000	30,000	Bulgaria	Active
Noble Sam Croft	GustoMSC P10000	2014 N	12,000	40,000	U.S. Gulf of Mexico	Available
Noble Tom Madden	GustoMSC P10000	2014 N	12,000	40,000	U.S. Gulf of Mexico	Available
Semisubmersibles—6
Noble Amos Runner	Noble EVA-4000™	1999 R/2008 M	8,000	32,500	U.S. Gulf of Mexico	Stacked
Noble Clyde Boudreaux	F&G 9500 Enhanced Pacesetter	2007 R/M	10,000	35,000	Singapore	Active
Noble Danny Adkins	Bingo 9000-DP	2009 R	12,000	35,000	U.S. Gulf of Mexico	Stacked
Noble Dave Beard	F&G 9500 Enhanced Pacesetter-DP	2009 R	10,000	35,000	Singapore	Stacked
Noble Jim Day	Bingo 9000-DP	2010 R	12,000	35,000	U.S. Gulf of Mexico	Stacked
Noble Paul Romano	Noble EVA-4000™	1998 R/2007 M	6,000	25,000	U.S. Gulf of Mexico	Active
Independent Leg Cantilevered Jackups—14
Noble Alan Hay	Levingston Class 111-C	2005 R	300	25,000	U.A.E.	Stacked
Noble David Tinsley	Modec 300C-38	2010 R	300	25,000	U.A.E.	Stacked
Noble Gene House	Modec 300C-38	1998 R	300	25,000	Saudi Arabia	Active
Noble Hans Deul (4)	F&G JU-2000E	2009 N	400	30,000	U.K.	Active
Noble Houston Colbert (4)	F&G JU-3000N	2014 N	400	30,000	Qatar	Active
Noble Joe Beall	Modec 300C-38	2004 R	300	25,000	Saudi Arabia	Active
Noble Lloyd Noble (4)	GustoMSC CJ70-x150-ST	2016 N	500	32,000	U.K.	Active
Noble Mick O’Brien (4)	F&G JU-3000N	2013 N	400	30,000	U.A.E.	Available
Noble Regina Allen (4)	F&G JU-3000N	2013 N	400	30,000	Canada	Active
Noble Roger Lewis (4)	F&G JU-2000E	2007 N	400	30,000	Saudi Arabia	Active
Noble Sam Hartley (4)	F&G JU-3000N	2014 N	400	30,000	Malaysia	Available
Noble Sam Turner (4)	F&G JU-3000N	2014 N	400	30,000	Denmark	Active
Noble Scott Marks (4)	F&G JU-2000E	2009 N	400	30,000	Saudi Arabia	Active
Noble Tom Prosser (4)	F&G JU-3000N	2014 N	400	30,000	Australia	Available

⁽¹⁾  Rigs designated with an “R” were modified, refurbished or otherwise upgraded in the year indicated by capital expenditures in an amount deemed material by management. Rigs designated with an “N” are newbuilds. Rigs designated with an “M” have been upgraded to the Noble NC-5SM mooring standard.

⁽²⁾  Rigs listed as “active” are operating, preparing to operate or under contract; rigs listed as “available” are actively seeking contracts and may include those that are idle or warm stacked; rigs listed as “shipyard” are in a shipyard for construction, repair, refurbishment or upgrade; rigs listed as “stacked” are idle without a contract and have reduced or no crew and are not actively marketed in present market conditions.

⁽³⁾  We own and operate the Noble Bully I and Noble Bully II through joint ventures with a subsidiary of Shell. Under the terms of the joint venture agreements, each party has an equal 50 percent ownership stake in both vessels.

⁽⁴⁾  Harsh environment capability.

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Facilities

Our corporate headquarters is located in London, England. We also maintain offices in Sugar Land, Texas, where significant worldwide global support activity occurs. In addition, we own and lease operational, administrative and marketing offices, as well as other sites used primarily for operations, storage and maintenance and repairs for drilling rigs and equipment in various locations worldwide.

Item 3. Legal Proceedings.

Information regarding legal proceedings is presented in “Note 14— Commitments and Contingencies” to our consolidated financial statements included in Part II, Item 8 of this Annual Report on Form 10-K.

Item 4. Mine Safety Disclosures.

Not applicable.

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Market for Shares and Related Shareholder Information

Noble-UK shares are listed and traded on the New York Stock Exchange under the symbol “NE.” The following table presents, for the periods indicated, the high and low sales prices and dividends or returns of capital declared and paid in U.S. Dollars per share:

	High		Low		Cash Dividends Declared and Paid
2017
Fourth quarter	$	4.78	$	3.67	$	—
Third quarter	4.74		3.14		—
Second quarter	6.46		3.35		—
First quarter	7.80		5.52		—
2016
Fourth quarter	$	8.37	$	4.45	$	—
Third quarter	8.98		5.37		0.02
Second quarter	12.19		7.82		0.02
First quarter	13.90		6.66		0.16

Our most recent quarterly dividend payment to shareholders, totaling approximately $5 million (or $0.02 per share), was declared on July 22, 2016 and paid on August 8, 2016 to holders of record on August 1, 2016. Our Board of Directors eliminated our quarterly cash dividend of $0.02 per share, beginning in the fourth quarter of 2016.

The declaration and payment of dividends require the authorization of the Board of Directors of Noble-UK, provided that such dividends on issued share capital may be paid only out of Noble-UK’s “distributable reserves” on its statutory balance sheet in accordance with UK laws. Therefore, Noble-UK is not permitted to pay dividends out of share capital, which includes share premiums. The resumption of the payment of future dividends will depend on our results of operations, financial condition, cash requirements, future business prospects, contractual restrictions and other factors deemed relevant by our Board of Directors.

On February 20, 2018, there were 246,776,217 shares outstanding held by 215 shareholder accounts of record.

UK Tax Consequences to Shareholders of Noble-UK

The tax consequences discussed below do not reflect a complete analysis or listing of all the possible tax consequences that may be relevant to shareholders of Noble. Shareholders should consult their own tax advisors in respect of the tax consequences related to receipt, ownership, purchase or sale or other disposition of our shares.

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UK Income Tax on Dividends and Similar Distributions

A non-UK tax resident holder will not be subject to UK income taxes on dividend income and similar distributions in respect of our shares, unless the shares are attributable to a permanent establishment or a fixed place of business maintained in the UK by such non-UK holder.

Disposition of Noble—UK Shares

Shareholders who are neither UK tax residents nor holding their Noble-UK shares in connection with a trade carried on through a permanent establishment in the UK will not be subject to any UK taxes on chargeable gains as a result of any disposals of their shares. Noble-UK shares held outside the facilities of The Depository Trust Company (“DTC”) should be treated as UK situs assets for the purpose of UK inheritance tax.

UK Withholding Tax—Dividends to Shareholders

Payments of dividends by Noble-UK will not be subject to any withholding in respect of UK taxation, regardless of the tax residence of the recipient shareholder.

Stamp Duty and Stamp Duty Reserve Tax in Relation to the Transfer of Shares

Stamp duty and/or stamp duty reserve tax (“SDRT”) are imposed by the UK on certain transfers of chargeable securities (which include shares in companies incorporated in the UK) at a rate of 0.5 percent of the consideration paid for the transfers in question. Certain transfers of shares to depositaries or into clearance systems are charged at a higher rate of 1.5 percent. Her Majesty’s Revenue and Customs (“HMRC”) regard DTC as a clearance system for these purposes.

Transfers of the Ordinary Shares through the facilities of DTC will not attract a charge to stamp duty or SDRT in the UK. Any transfer of title to Ordinary Shares from within those facilities to a holder outside those facilities, and any subsequent transfers that occur entirely outside those facilities, will ordinarily attract stamp duty or SDRT at a rate of 0.5 percent. This duty must be paid (and, where relevant, the transfer document stamped by HMRC) before the transfer can be registered in the books of Noble-UK. However, if those Ordinary Shares of Noble-UK are redeposited into the facilities of DTC, that redeposit will attract stamp duty or SDRT at the rate of 1.5 percent.

Share Repurchases

The Company is only permitted to purchase its own shares by way of an “off-market purchase” in a plan approved by shareholders. In December 2014, we received shareholder approval to repurchase up to 37 million ordinary shares, or approximately 15 percent of our outstanding ordinary shares at the time of such shareholder approval. The authority to make such repurchases expired at the end of the Company’s 2016 annual general meeting of shareholders, which was held on April 22, 2016. During 2015, we repurchased 6.2 million of our ordinary shares covered by this authorization at an average price of $16.10 per share, excluding commissions and stamp tax, for a total cost of approximately $100.6 million. All shares repurchased were made in the open market pursuant to the share repurchase program discussed above, and all shares repurchased were immediately canceled. During the years ended December 31, 2017 and 2016, we did not repurchase any of our shares.

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Stock Performance Graph

The chart below presents a comparison of the five-year cumulative total return, assuming $100 was invested on December 31, 2012 for Noble-UK, the Standard & Poor's 500 Index, Dow Jones U.S. Oil Equipment and Services and a self-determined offshore drillers peer group. Total return assumes the reinvestment of dividends, if any, in the security on the ex-dividend date.

	INDEXED RETURNS Year Ended December 31,
Company / Index	2013		2014		2015		2016		2017
Noble-UK	$	109.81	$	57.94	$	40.19	$	23.06	$	17.61
S&P 500 Index	132.39		150.51		152.59		170.84		208.14
Dow Jones U.S. Oil Equipment & Services	128.41		106.29		82.40		104.91		87.38
Offshore Drillers Peer Group (1)	108.90		52.00		29.30		26.75		18.80

⁽¹⁾  Our self-determined peer group is weighted according to market capitalization and consists of the Company and the following peer companies: Atwood Oceanics (through October 5, 2017), Diamond Offshore Drilling Inc., Ensco plc, Rowan Companies plc, Seadrill Ltd. and Transocean Ltd.

The above graph and related information shall not be deemed “soliciting material” or to be “filed” with the SEC, nor shall such information be incorporated by reference into any future filing under the Securities Act or the Exchange Act, except to the extent that we specifically incorporate it by reference into such filing.

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Item 6. Selected Financial Data.

The following table presents selected financial data of us and our consolidated subsidiaries over the five-year period ended December 31, 2017, which information is derived from our audited financial statements. This information should be read in conjunction with, and is qualified in its entirety by, the more detailed information in our financial statements included in Part II, Item 8 “Financial Statements and Supplementary Data,” in this Annual Report on Form 10-K.

	Year Ended December 31,
	2017			2016			2015			2014			2013
	(In thousands, except per share amounts)
Statement of Income Data
Operating revenues from continuing operations	$	1,236,915		$	2,302,065		$	3,352,252		$	3,232,504		$	2,538,143
Net Income (loss) from continuing operations attributable to Noble-UK (1)	(516,511		)	(929,580		)	511,000			(152,011		)	478,595
Net Income (loss) from continuing operations per share attributable to Noble-UK:
Basic	(2.11		)	(3.82		)	2.06			(0.60		)	1.86
Diluted	(2.11		)	(3.82		)	2.06			(0.60		)	1.86
Balance Sheet Data (at end of period)
Cash and cash equivalents	662,829			725,722			512,245			68,510			114,458
Property and equipment, net	9,489,240			10,061,948			11,483,623			12,112,509			14,558,090
Total assets (2)	10,794,659			11,440,117			12,865,645			13,266,480			16,194,639
Long-term debt (2)	3,795,867			4,040,229			4,162,638			4,848,678			5,532,933
Total debt (3)	4,045,710			4,340,111			4,462,562			4,848,678			5,532,933
Total equity	5,950,628			6,467,445			7,422,230			7,287,034			9,050,028
Other Data
Net cash provided by operating activities	453,938			1,126,076			1,764,907			1,778,627			1,708,037
Net cash used in investing activities	(155,588		)	(669,931		)	(432,537		)	(2,109,268		)	(2,485,107		)
Net cash provided by (used in) financing activities	(361,243		)	(242,668		)	(888,635		)	284,693			609,436
Capital expenditures (4)	111,140			695,925			422,544			2,072,885			2,487,520
Working capital (2)(5)	445,951			559,321			377,034			259,888			339,020
Cash distributions declared per share	—			0.20			1.28			1.50			0.76

⁽¹⁾  Results for 2017, 2016, 2015, 2014 and 2013 include impairment charges of $121.6 million, $1.5 billion, $418.3 million, $745.0 million and $3.6 million, respectively.

⁽²⁾  Certain amounts in prior periods have been reclassified to conform to the current year presentation. In accordance with our adoption of Accounting Standard Update No. 2015-3, unamortized debt issuance costs related to our senior notes are now shown as a direct reduction of the carrying amount of the related debt. See Part II, Item 8, “Financial Statements and Supplementary Data, Note 1— Organization and Significant Accounting Policies” and “Note 6— Impairment” for more information.

⁽³⁾  Consists of Long-term debt and Current maturities of long-term debt.

⁽⁴⁾  Capital expenditures includes expenditures made for rigs that were ultimately transferred to Paragon Offshore as part of the Spin-off in August 2014.

⁽⁵⁾  Working capital is calculated as current assets less current liabilities.

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion is intended to assist you in understanding our financial position at December 31, 2017 and 2016, and our results of operations for each of the years in the three-year period ended December 31, 2017. The following discussion should be read in conjunction with the consolidated financial statements and related notes contained in this Annual Report on Form 10-K for the year ended December 31, 2017 filed by Noble-UK and Noble-Cayman.

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Executive Overview

We provide contract drilling services to the international oil and gas industry with our global fleet of mobile offshore drilling units. As of the filing date of this Annual Report on Form 10-K, our fleet of 28 drilling rigs consisted of eight drillships, six semisubmersibles and 14 jackups strategically deployed worldwide. We typically employ each drilling unit under an individual contract. Although the final terms of the contracts result from negotiations with our customers, many contracts are awarded based upon a competitive bidding process.

Our 2017 financial and operating results from continuing operations include:

• operating revenues totaling $1.2 billion;

• net loss of $516.5 million, or $2.10 per diluted share, which includes a $94.8 million after-tax impairment charge recognized on three of our rigs and certain capital spare equipment; and

• net cash from operating activities totaling $453.9 million.

The challenging business environment for offshore drillers continued during 2017 and into 2018. An industry-wide rig supply imbalance has remained in place, as curtailed offshore spending by customers contributed to a growing number of rigs without drilling programs. In addition, newbuild rigs ordered prior to the decline in industry activity continue to exit shipyards, while the delivery of other newbuild rigs have been delayed into the future. In either case, these rigs add to the supply imbalance. Since 2015, the industry has experienced a higher level of fleet attrition, as rigs are removed from the global supply due to a number of factors, including advanced service life, high maintenance and reactivation costs and limited customer appeal. However, the pace of attrition has been significantly less than what is required to ameliorate the capacity imbalance. In addition, our customers have adopted a cautious approach to offshore spending as crude oil prices have declined from approximately $112 per barrel for Brent crude on June 30, 2014 to as low as approximately $30 per barrel in January 2016, before improving to $65 per barrel on February 20, 2018. Although crude oil prices have been less volatile during 2017, we expect that the offshore drilling programs of operators will remain curtailed, until higher crude oil prices are sustained and our customers' capital spending increases. Until then, further decline in rig utilization and dayrates is possible.

We expect the business environment for the remainder of 2018 to remain challenging. The uncertainty of the viability and length of reductions in production agreed to by the Organization of Petroleum Exporting Countries (“OPEC”), the incremental production capacity in non-OPEC countries, including growing production from U.S. shale activity, the current U.S. political environment and fluid sentiment in oil markets are contributing to an uncertain oil price environment, leading to considerable uncertainty in our customers’ production spending plans. However, steady demand growth, the lack of production investments in various countries around the world and the production limits agreed to by OPEC have helped to establish market conditions supporting higher sustained crude prices recently. In general, recent contract awards have been subject to an extremely competitive bidding process. As a result, the contracts have been for dayrates that are substantially lower than rates were for the same class of rigs before this period of imbalance. We cannot give any assurances as to when conditions in the offshore drilling market will improve, or when the oversupply of available drilling rigs will end. While current market conditions persist, we will continue to focus on fleet utilization improvements, cost control initiatives and financial discipline, including the preservation of liquidity. The current business environment could lead to us stacking or retiring additional rigs.

We cannot predict the future level of demand or dayrates for our services, or future conditions in the offshore contract drilling industry. However, we believe in the long-term fundamentals for the industry and believe we are strategically well positioned during this market downturn as a result of our substantial backlog, modern fleet of high-specification rigs and strong operational capability. We also believe that these strengths will help us take advantage of any future market upcycle. Also, we expect the ultimate recovery to benefit from any sustained under-investment by customers during this current phase of the market cycle. Acceleration in customers' offshore spending, in combination with further fleet attrition, should contribute to a balanced rig supply over time.

Our business strategy focuses on a balanced, high-specification fleet of both floating and jackup rigs and the deployment of our drilling rigs in important oil and gas basins around the world.

We have expanded our drilling and fleet through our newbuild program. We took delivery of our last remaining newbuild, the heavy-duty, harsh environment jackup, the Noble Lloyd Noble, in July 2016. The Noble Lloyd Noble commenced operations in November 2016 under a four-year contract in the North Sea. Although we plan to prioritize capital preservation and liquidity based on current market conditions, from time to time we will also continue to evaluate opportunities to enhance our fleet, particularly focusing on higher specification rigs, to execute the increasingly complex drilling programs required by our customers.

Spin-off of Paragon Offshore plc

On August 1, 2014, Noble-UK completed the Spin-off of a majority of its standard specification offshore drilling business through a pro rata distribution of all of the ordinary shares of its wholly-owned subsidiary, Paragon Offshore, to the holders of Noble’s ordinary shares.

29

In February 2016, Paragon Offshore sought approval of a pre-negotiated plan of reorganization (the “Prior Plan”) by filing for voluntary relief under Chapter 11 of the United States Bankruptcy Code. As part of the Prior Plan, we entered into a settlement agreement with Paragon Offshore (the “Settlement Agreement”). The Prior Plan was rejected by the bankruptcy court in October 2016.

In April 2017, Paragon Offshore filed an updated disclosure statement and a revised plan of reorganization (the “New Plan”) in its bankruptcy proceeding. Under the New Plan, including Paragon Offshore’s revised business plan, Paragon Offshore no longer needed the Mexican tax bonding that Noble-UK was to provide under the Settlement Agreement. As a result, the Settlement Agreement was no longer applicable to the ongoing business of Paragon Offshore. Consequently, Paragon Offshore abandoned the Settlement Agreement as part of the New Plan, and the Settlement Agreement was terminated at the time of the filing of the New Plan. On May 2, 2017, Paragon Offshore announced that it had reached an agreement in principle with both its secured and unsecured creditors to revise the New Plan to, among other things, create and fund a $10.0 million litigation trust to pursue litigation against us. On June 7, 2017, the revised New Plan was approved by the bankruptcy court and Paragon Offshore emerged from bankruptcy on July 18, 2017.

On December 15, 2017, the litigation trust filed claims relating to the Spin-off against us and certain of our current and former officers and directors in the Delaware bankruptcy court that heard Paragon Offshore’s bankruptcy. The complaint alleges claims of alleged actual and constructive fraudulent conveyance, unjust enrichment and recharacterization of intercompany notes as equity claims against Noble and claims of breach of fiduciary duty and aiding and abetting breach of fiduciary duty against the officer and director defendants. We continue to believe that Paragon Offshore, at the time of the Spin-off, was properly funded, solvent and had appropriate liquidity and that the claims brought by the litigation trust are without merit and will be contested vigorously by us.

If any of the litigation trust’s claims are successful, or if we elect to settle any claims, any damages or other amounts we would be required to or agree to pay could have a material adverse effect on our business, financial condition and results of operations. The litigation is in the very early stages, no schedule has been established, and we are not able to predict when, or if, the matters will go to trial or otherwise be concluded. We may be required to establish reserves on our financial statements in advance of the conclusion of the litigation. Such reserves may be substantial and could have a material adverse effect on our financial condition as presented in such financial statements.

Prior to the completion of the Spin-off, Noble-UK and Paragon Offshore entered into a series of agreements to effect the separation and Spin-off and govern the relationship between the parties after the Spin-off (the “Separation Agreements”), including the Master Separation Agreement (the “MSA”) and the Tax Sharing Agreement (the “TSA”).

As part of its final bankruptcy plan, Paragon Offshore rejected the Separation Agreements. Accordingly, the indemnity obligations that Paragon Offshore potentially would have owed us under the Separation Agreements have now terminated, including indemnities arising under the MSA and the TSA in respect of obligations related to Paragon Offshore’s business that were incurred through Noble-retained entities prior to the Spin-off. Likewise, any potential indemnity obligations that we would have owed Paragon Offshore under the Separation Agreements, including those under the MSA and the TSA in respect of Noble-UK’s business that was conducted prior to the Spin-off through Paragon Offshore-retained entities, are now also extinguished. In the absence of the Separation Agreements, liabilities relating to the respective parties will be borne by the owner of the legal entity or asset at issue and neither party will look to an allocation based on the historic relationship of an entity or asset to one of the party’s business, as had been the case under the Separation Agreements.

The rejection and ultimate termination of the indemnity and related obligations under the Separation Agreements has resulted in a number of accounting charges and benefits for the year ended December 31, 2017, and such termination may continue to affect us in the future as liabilities arise for which we would have been indemnified by Paragon Offshore or would have had to indemnify Paragon Offshore. We do not expect that, overall, the rejection of the Separation Agreements by Paragon Offshore will have a material adverse effect on our financial condition or liquidity. However, any loss we experience with respect to which we would have been able to secure indemnification from Paragon Offshore under one or more of the Separation Agreements could have an adverse impact on our results of operations in any period, which impact may be material depending on our results of operations during this down-cycle.

During the year ended December 31, 2017, we recognized net charges of $15.9 million, with a non-cash loss of $1.5 million recorded in “Net loss from discontinued operations, net of tax” on our Consolidated Statement of Operations relating to Paragon Offshore's emergence from bankruptcy.

U.S. Federal Income Tax Reform

On December 22, 2017, the President of the United States signed into law legislation informally known as the Tax Cuts and Jobs Act (the “Act”). The Act represents major tax reform legislation that, among other provisions, reduces the U.S. corporate tax rate. For more information on the Act and its effect on our consolidated financial statements, see “—Critical Accounting Policies” and Part II, Item 8, “Note 10— Income Taxes.”

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Impairment

As more thoroughly described in “Note 6— Impairment” to our consolidated financial statements, included in Part II, Item 8 of this Annual Report on Form 10-K, we evaluate property and equipment for impairment whenever events or changes in circumstances (including the decision to cold stack, retire or sell a rig) indicate that the carrying amount of an asset may not be recoverable. An impairment loss is recognized when and to the extent that an asset's carrying value exceeds its estimated fair value. As part of this analysis, we make assumptions and estimates regarding future market conditions. To the extent actual results do not meet our estimated assumptions for a given rig or piece of equipment, we may take an impairment loss in the future.

During the years ended December 31, 2017, 2016 and 2015, we recognized non-cash, before-tax impairment charges of $121.6 million, $1.5 billion and $418.3 million, respectively, related to certain rigs and related capital spares. These impairments were driven by factors such as customer suspensions of drilling programs, contract cancellations, a further reduction in the number of new contract opportunities, capital spare equipment obsolescence, and our belief that a drilling unit is no longer marketable and is unlikely to return to service.

There can be no assurance that we will not have to take additional impairment charges in the future if current depressed market conditions persist.

Contract Drilling Services Backlog

We maintain a backlog of commitments for contract drilling services. Our contract drilling services backlog reflects estimated future revenues attributable to signed drilling contracts. While backlog did not include any letters of intent as of December 31, 2017, in the past we have included in backlog certain letters of intent that we expect to result in binding drilling contracts.

We calculate backlog for any given unit and period by multiplying the full contractual operating dayrate for such unit by the number of days remaining in the period, and for the three rigs contracted with Shell mentioned below, we utilize the idle period and floor rates as described in Footnote (4) to the backlog table below. The reported contract drilling services backlog does not include amounts representing revenues for mobilization, demobilization and contract preparation, which are not expected to be significant to our contract drilling services revenues, amounts constituting reimbursables from customers or amounts attributable to uncommitted option periods under drilling contracts or letters of intent.

The table below presents the amount of our contract drilling services backlog and the percent of available operating days committed for the periods indicated:

			Year Ending December 31, (1)
	Total		2018			2019			2020			2021			2022-2023
	(In thousands)
Contract Drilling Services Backlog
Semisubmersibles/Drillships (2)(3)	$	1,881,777	$	504,447		$	400,140		$	381,560		$	338,800		$	256,830
Jackups (4)	1,077,545		391,041			304,700			222,963			116,070			42,771
Total(5)	$	2,959,322	$	895,488		$	704,840		$	604,523		$	454,870		$	299,601
Percent of Available Days Committed(6)
Semisubmersibles/Drillships			36		%	30		%	29		%	23		%	9		%
Jackups			53		%	28		%	19		%	14		%	3		%
Total			44		%	29		%	24		%	19		%	6		%

⁽¹⁾  Represents a twelve-month period beginning January 1, 2018.

⁽²⁾  As previously reported, three of our long-term drilling contracts with Shell, the Noble Bully II, Noble Globetrotter I and Noble Globetrotter II contain a dayrate adjustment mechanism that utilizes an average of market rates that match a set of distinct technical attributes and is subject to a modest discount, beginning on the fifth-year anniversary of the contract and continuing every six months thereafter. On December 12, 2016, we amended those drilling contracts with Shell. As a result of the amendments, each of the contracts now has a contractual dayrate floor. The contract amendments for the Noble Globetrotter I and Noble Globetrotter II provide a dayrate floor of $275,000 per day. The Noble Bully II contract contains a dayrate floor of $200,000 per day plus daily operating expenses. The amendment also provided Shell the right to idle the Noble Bully II for up to one year and Noble Globetrotter II for up to two years, each at a special stacking rate. Shell has exercised its right and, beginning late December 2016, we idled the Noble Globetrotter II at a rate of $185,000 per day. The Noble Bully II was idled at a rate of $200,000 per day, effective April 3, 2017. Once the dayrate adjustment mechanism becomes effective and following any idle periods, the dayrate for these rigs will not be lower than the higher of (i) the contractual dayrate floor or (ii) the market rate as calculated under the adjustment mechanism. The impact to contract backlog from these amendments has

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been reflected in the table above and the backlog calculation assumes that, after any idle period at the contractual stacking rate, each rig will work at their respective dayrate floor for the remaining contract term.

⁽³⁾  Noble and a subsidiary of Shell are involved in joint ventures that own and operate both the Noble Bully I and Noble Bully II. Pursuant to these agreements, each party has an equal 50 percent share in both vessels. As of December 31, 2017, the combined amount of backlog for these rigs totaled $515.0 million, all of which is included in backlog. Noble’s proportional interest in the backlog for these rigs totaled $257.5 million.

⁽⁴⁾  Our Saudi Aramco contract rates for the Noble Joe Beall and Noble Gene House were adjusted downward in 2015. We expect the contract rates to be in the general range of the amended rates through the end of each respective contract. Backlog for these contracts has been prepared assuming the reduced rates apply for the remainder of the contract.

⁽⁵⁾  Some of our drilling contracts provide the customers with certain early termination rights and, in limited cases, those termination rights require minimal or no notice and financial penalties. As of February 20, 2018, no new notifications of contract terminations have been received.

⁽⁶⁾  Percent of available days committed is calculated by dividing the total number of days our rigs are operating under contract for such period by the product of the number of our rigs and the number of calendar days in such period.

The amount of actual revenues earned and the actual periods during which revenues are earned may be materially different than the backlog amounts and backlog periods presented in the table above due to various factors, including, but not limited to, shipyard and maintenance projects, unplanned downtime, the operation of market benchmarks for dayrate resets, achievement of bonuses, weather conditions, reduced standby or mobilization rates and other factors that result in applicable dayrates lower than the full contractual operating dayrate. In addition, amounts included in the backlog may change because drilling contracts may be varied or modified by mutual consent or customers may exercise early termination rights contained in some of our drilling contracts or decline to enter into a drilling contract after executing a letter of intent. As a result, our backlog as of any particular date may not be indicative of our actual operating results for the periods for which the backlog is calculated. See Part I, Item 1A, “Risk Factors— Our current backlog of contract drilling revenue may not be ultimately realized.”

For the year ended December 31, 2017, Shell, Saudi Aramco and Statoil represented approximately 57.7 percent, 18.6 percent and 14.3 percent of our backlog, respectively.

Results of Operations

2017 Compared to 2016

Net loss from continuing operations attributable to Noble-UK for the year ended December 31, 2017 was $515.0 million, or $2.10 per diluted share, on operating revenues of $1.2 billion, compared to a net loss from continuing operations for the year ended December 31, 2016 of $929.6 million, or $3.82 per diluted share, on operating revenues of $2.3 billion.

As a result of Noble-UK conducting all of its business through Noble-Cayman and its subsidiaries, the financial position and results of operations for Noble-Cayman, and the reasons for material changes in the amount of revenue and expense items between December 31, 2017 and December 31, 2016, would be the same as the information presented below regarding Noble-UK in all material respects, with the exception of operating income (loss). During the years ended December 31, 2017 and 2016, Noble-Cayman's operating loss was $37.9 million and $29.7 million lower, respectively, than that of Noble-UK. The operating loss difference is primarily a result of administration and other costs directly attributable to Noble-UK for operations support and stewardship-related services.

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Key Operating Metrics

Operating results for our contract drilling services segment are dependent on three primary metrics: operating days, dayrates and operating costs. We also track rig utilization, which is a function of operating days and the number of rigs in our fleet. For more information on operating costs, see “—Contract Drilling Services,” below. The following table presents the average rig utilization, operating days and average dayrates for our rig fleet for the years ended December 31, 2017 and 2016:

	Average Rig Utilization (1)				Operating Days (2)				Average Dayrates
	December 31,				December 31,				December 31,
	2017		2016		2017	2016	% Change		2017		2016			% Change
Jackups	85	%	83	%	4,367	3,966	10	%	$	126,109	$	126,279		—	%
Semisubmersibles	17	%	22	%	365	649	(44	)%	155,919		256,122			(39	)%
Drillships	59	%	82	%	1,716	2,408	(29	)%	$	349,244	$	654,074	(3)	(47	)%
Total	63	%	66	%	6,448	7,023	(8	)%	$	187,181	$	319,256		(41	)%

⁽¹⁾  We define utilization for a specific period as the total number of days our rigs are operating under contract, divided by the product of the total number of our rigs, including cold stacked rigs, and the number of calendar days in such period. Information reflects our policy of reporting on the basis of the number of available rigs in our fleet, excluding newbuild rigs under construction.

⁽²⁾  Information reflects the number of days that our rigs were operating under contract.

⁽³⁾  Average dayrates include a $14.4 million loss in the year ended December 31, 2017 and a $14.4 million gain in the year ended December 31, 2016, in respect of the termination date valuation of certain contingent payments for the Noble Sam Croft and Noble Tom Madden related to the FCX Settlement. The loss in 2017 had a negative impact and the gain in 2016 had a positive impact on the drillships average dayrates.

Contract Drilling Services

The following table presents the operating results for our contract drilling services segment for the years ended December 31, 2017 and 2016 (dollars in thousands):

	Year Ended December 31,						Change
	2017			2016			$			%
Operating revenues:
Contract drilling services	$	1,207,026		$	2,242,200		$	(1,035,174	)	(46	)%
Reimbursables and other (1)	29,889			59,865			(29,976		)	(50	)%
	$	1,236,915		$	2,302,065		$	(1,065,150	)	(46	)%
Operating costs and expenses:
Contract drilling services	$	640,489		$	879,438		$	(238,949	)	(27	)%
Reimbursables (1)	18,435			45,608			(27,173		)	(60	)%
Depreciation and amortization	524,752			587,999			(63,247		)	(11	)%
General and administrative	71,634			69,258			2,376			3	%
Loss on impairment	121,639			1,458,749			$	(1,337,110	)	(92	)%
	1,376,949			3,041,052			(1,664,103		)	(55	)%
Operating loss	$	(140,034	)	$	(738,987	)	$	598,953		(81	)%

⁽¹⁾  We record reimbursements from customers for out-of-pocket expenses as operating revenues and the related direct costs as operating expenses. Changes in the amount of these reimbursables generally do not have a material effect on our financial position, results of operations or cash flows.

Operating Revenues. The $1.0 billion decline in contract drilling services revenues for the year ended December 31, 2017 as compared to 2016 was composed of an $851.6 million decline from lower dayrates and a $183.6 million decline due to fewer operating days. The contract drilling services revenues decline was primarily due to our drillship and semisubmersible fleets, which experienced declines in revenues of $975.7 million and $109.3 million, respectively, and was partially offset by revenue increases in our jackup fleet of $49.8 million.

The $975.7 million revenue decline in our drillship fleet for the year ended December 31, 2017 as compared to 2016 consists of a $523.1 million decline from lower dayrates and $452.6 million decline due to fewer operating days. The decline in average dayrates was primarily related to the payment of the $393.0 million FCX Settlement in 2016. Of the decline in revenue attributable to operating days, $281.5 million is related to the Noble Bully I and Noble Bob Douglas operating for all of 2016, but being idle for the majority of 2017. The remainder of the decline in

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operating days and the decline in average dayrates was attributable to the Noble Tom Madden and Noble Sam Croft, whose contracts were terminated in May 2016.

The $109.3 million revenue decline in our semisubmersible fleet for the year ended December 31, 2017 as compared to 2016, consists of a $36.6 million decline from lower dayrates and a $72.7 million decline due to fewer operating days. The decline in both average dayrates and operating days as compared to 2016 was attributable to contract completions for the Noble Clyde Boudreaux, Noble Jim Day,Noble Dave Beard, Noble Danny Adkins and Noble Amos Runner, none of which have returned to work since their respective contract completions.

The $49.8 million revenue increase in our jackup fleet is primarily attributable to an increase in operating days on the Noble Mick O'Brien and Noble Regina Allen as well as the startup of the newbuild Noble Lloyd Noble.

Operating Costs and Expenses. Contract drilling services costs decreased $238.9 million for the year ended December 31, 2017 as compared to 2016. Of the decrease, $179.0 million was due to rigs that operated during 2016 being idle during 2017. An additional $113.1 million decrease in cost was due to continuing cost control measures, yielding reductions in labor and training related costs of approximately $53.8 million, operations support costs of $29.7 million, repair and maintenance costs of $28.1 million, and rig mobilization costs of $3.0 million. These cost decreases were partially offset by the startup of the Noble Lloyd Noble, a greater number of operating days for contracted rigs during 2017 and the write-off of a $14.4 million customer receivable during 2017.

Depreciation and amortization decreased $63.2 million for the year ended December 31, 2017 as compared to the same period of 2016. The decline was due to the effect of rig retirements and impairments during 2016, partially offset by the effect of the Noble Lloyd Noble being placed into service during November 2016.

Other Income and Expenses

General and administrative expenses. General and administrative expenses increased $2.4 million during the year ended December 31, 2017 as compared to the same period of 2016, primarily due to higher professional fees.

Interest Expense, net of amount capitalized. Interest expense, net of amount capitalized, increased $69.1 million during the year ended December 31, 2017 as compared to 2016. This increase was primarily due to the interest incurred during 2017 on the senior notes issued in December 2016, the absence of capitalized interest during 2017 and an increase in interest rates on certain of our senior notes due to the downgrading of our credit rating. These increases were partially offset by the retirement of a portion of our Senior Notes due 2020 (the “2020 Notes”), Senior Notes due 2021 (the “2021 Notes”) and Senior Notes due 2022 (the “2022 Notes”) as a result of tender offers in 2016 and the maturity of our Senior Notes due 2017 (the “2017 Notes”). For additional information see, Part II, Item 8, “Financial Statements and Supplementary Data, Note 7— Debt,” to our consolidated financial statements.

Income Tax Provision. Our income tax provision increased $151.8 million for the year ended December 31, 2017 as compared to the same period of 2016. The increase was primarily due to a $260.7 million non-cash discrete tax item resulting from a tax restructuring in 2017. The effect of this tax restructuring will be to lower current tax expense. This increase was partially offset by the tax effect of the FCX contract settlement of $27.2 million in 2016. Excluding the impact of these items, taxes decreased by $86.0 million as a result of lower pre-tax income in the current year, primarily from our geographical mix of pre-tax income.

2016 Compared to 2015

Net loss from continuing operations attributable to Noble-UK for the year ended December 31, 2016was $929.6 million, or $3.82 per diluted share, on operating revenues of $2.3 billion compared to net income from continuing operations for the year ended December 31, 2015 of $511.0 million, or 2.06 per diluted share, on operating revenues of $3.4 billion.

As a result of Noble-UK conducting all of its business through Noble-Cayman and its subsidiaries, the financial position and results of operations for Noble-Cayman, and the reasons for material changes in the amount of revenue and expense items between December 31, 2016 and December 31, 2015, would be the same as the information presented below regarding Noble-UK in all material respects, with the exception of operating income (loss). During the year ended December 31, 2016 and 2015, Noble-Cayman's operating loss was $29.7 million lower and operating income was $28.8 million higher, respectively, than that of Noble-UK. The operating income (loss) difference is primarily a result of administration and other costs directly attributable to Noble-UK for operations support and stewardship related services.

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Key Operating Metrics

Operating results for our contract drilling services segment are dependent on three primary metrics: operating days, dayrates and operating costs. We also track rig utilization, which is a function of operating days and the number of rigs in our fleet. For more information on operating costs, see “—Contract Drilling Services,” below. The following table presents the average rig utilization, operating days and average dayrates for our rig fleet for the years ended December 31, 2016 and 2015:

	Average Rig Utilization (1)				Operating Days (2)				Average Dayrates
	December 31,				December 31,				December 31,
	2016		2015		2016	2015	% Change		2016			2015			% Change
Jackups	83	%	85	%	3,966	3,967	—	%	$	126,279	(3)	$	162,348		(22	)%
Semisubmersibles	22	%	63	%	649	1,876	(65	)%	256,122			445,320			(42	)%
Drillships	82	%	100	%	2,408	3,257	(26	)%	654,074		(4)	547,265		(5)	20	%
Total	66	%	84	%	7,023	9,100	(23	)%	$	319,256		$	358,423		(11	)%

⁽¹⁾  We define utilization for a specific period as the total number of days our rigs are operating under contract, divided by the product of the total number of our rigs, including cold stacked rigs, and the number of calendar days in such period. Information reflects our policy of reporting on the basis of the number of available rigs in our fleet, excluding newbuild rigs under construction.

⁽²⁾  Information reflects the number of days that our rigs were operating under contract.

⁽³⁾  Average dayrate for the year ended December 31, 2016 includes $16.4 million in contract drilling services revenue related to the Noble Tom Prosser contract cancellation with Quadrant Energy Australia Limited (“Quadrant”). The additional contract drilling services revenue in 2016 had a positive impact on the jackups average dayrates.

⁽⁴⁾  Average dayrate for the year ended December 31, 2016 includes a gain of $14.4 million related to the termination date valuation of certain contingent payments for the Noble Sam Croft and Noble Tom Madden related to the FCX Settlement. The gain in 2016 had a positive impact on the drillships average dayrates.

⁽⁵⁾  Average dayrate for the year ended December 31, 2015 includes $145.0 million in contract drilling services revenue related to the Noble Discoverer contract cancellation with Shell during 2015. The additional contract drilling services revenue in 2015 had a positive impact on the drillships average dayrates.

Contract Drilling Services

The following table presents the operating results for our contract drilling services segment for the years ended December 31, 2016 and 2015(dollars in thousands):

	Year Ended December 31,					Change
	2016			2015		$			%
Operating revenues:
Contract drilling services	$	2,242,200		$	3,261,610	$	(1,019,410	)	(31	)%
Reimbursables and Other (1)	59,865			88,597		(28,732		)	(32	)%
	$	2,302,065		$	3,350,207	$	(1,048,142	)	(31	)%
Operating costs and expenses:
Contract drilling services	$	879,438		$	1,232,529	$	(353,091	)	(29	)%
Reimbursables (1)	45,608			68,182		(22,574		)	(33	)%
Depreciation and amortization	587,999			611,748		(23,749		)	(4	)%
General and administrative	69,258			76,843		(7,585		)	(10	)%
Loss on impairment	1,458,749			405,512		1,053,237			260	%
	3,041,052			2,394,814		646,238			27	%
Operating income (loss)	$	(738,987	)	$	955,393	$	(1,694,380	)	(177	)%

⁽¹⁾  We record reimbursements from customers for out-of-pocket expenses as operating revenues and the related direct costs as operating expenses. Changes in the amount of these reimbursables generally do not have a material effect on our financial position, results of operations or cash flows.

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Operating Revenues. The $1.0 billion decline in contract drilling services revenues for the year ended December 31, 2016 as compared to 2015 was composed of a $744.3 million decline due to fewer operating days and a $275.1 million decline from lower dayrates. The contract drilling services revenues decline was due to our semisubmersible, drillship and jackup fleets, which experienced declines in revenues of $669.0 million, $207.2 million and $143.2 million, respectively.

The $669.0 million revenue decline in our semsubmersible fleet consists of a $546.3 million decline due to fewer operating days and a $122.7 million decline from lower dayrates as compared to 2015. The declines in both operating days and average dayrates as compared to 2015 was attributable to contract completions for the Noble Jim Day, Noble Clyde Boudreaux, Noble Amos Runner, Noble Danny Adkins and Noble Dave Beard, which operated during the majority of 2015, but were not under contract in the majority of 2016.

The $207.2 million revenue decline in our drillship fleet consists of a $464.4 million decline due to fewer operating days, which was partially offset by a $257.2 million increase due to higher average dayrates as compared to 2015. The decline in operating days was primarily attributable to the retirement and subsequent sale of the Noble Discoverer, which operated in 2015 but did not operate during 2016. To a lesser extent, the decline in operating days was related to the contract cancellations of the Noble Sam Croft and Noble Tom Madden in 2016 and increased shipyard days on the Noble Globetrotter I in 2016. The revenue declines were partially offset by an increase in dayrate revenues primarily related to the occurrence of the $393.0 million FCX Settlement recognized in 2016.

The $143.2 million revenue decline in our semisubmersible fleet consists of a $143.1 million and $0.1 million decline due to a decrease in average dayrates and fewer operating days, respectively, as compared to 2015. The decrease in average dayrates was primarily attributable to the Noble Regina Allen, which was not operating under a contract during the majority of 2016 but operated during 2015, the retirement and subsequent sale of the Noble Charles Copeland, which operated during 2015, and the Noble Houston Colbert, which completed its contract during 2016. The revenue decreases were partially offset by the commencement of the newbuilds, the Noble Sam Hartley and Noble Lloyd Noble, which commenced operations in January 2016 and November 2016, respectively.

Operating Costs and Expenses. Contract drilling services costs decreased $353.1 million for the year ended December 31, 2016 as compared to 2015. Of the decrease, $254.5million was due to rigs that operated during2015, but were idle during2016. An additional $95.2 million decline in cost was due to the retirement of theNoble Discoverer, Noble Charles CopelandandNoble Max Smith. An additional $62.1 million decline was due to continuing cost control measures. The cost control measures yielded reductions in repair and maintenance costs of $21.4 million, labor and training related costs of $19.9 million, operations support costs of approximately $8.1 million and other rig-related costs of $12.7 million. This was partially offset by a $58.7 million increase in cost related to rigs that had additional operating days during2016, including two newbuild rigs, which commenced operations during 2016.

Loss on impairment during 2016 of $1.5 billion was recognized after we identified indicators that the carrying value of certain assets in our fleet may not be recoverable. As a result of our analysis, we determined that the carrying amounts of certain drilling units were impaired. In connection with our annual analysis, we impaired the carrying values for the Noble Amos Runner, Noble Clyde Boudreaux and Noble Dave Beard to the fair value. The impairment charge related to these units was approximately $1.0 billion. We also decided to retire from service our semisubmersible, the Noble Max Smith,which we sold during the fourth quarter of 2016 for approximately $1.2 million, and we recognized an impairment charge of approximately $164.8 million.

Also, in the fourth quarter of 2016, in connection with our impairment analysis, we concluded that the semisubmersible, the Noble Homer Ferrington and certain capital spare equipment would not be utilized in the foreseeable future and we recognized an impairment charge of approximately $120.1 million and $153.9 million, respectively. In the second quarter of 2016, we recognized a charge of approximately $16.6 million for the impairment of certain capital spare equipment based upon our decision to dispose of this equipment.

Other Income and Expenses

General and administrative expenses. General and administrative expenses decreased $7.6 million during 2016 as compared to 2015, primarily as a result of decreased employee-related costs.

Interest Expense, net of amount capitalized. Interest expense, net of amount capitalized, increased $9.1 million during 2016 as compared to 2015. The increase was a result of a full period of interest in respect of the senior notes issued in March 2015, an increase in applicable interest rates on those senior notes due to the downgrading of our credit rating below investment grade during 2016 and lower capitalized interest in 2016 as compared to 2015, due to the completion of construction of two newbuild jackups, the Noble Sam Hartley and Noble Lloyd Noble, which commenced their respective contracts in January 2016 and November 2016. During 2016, we capitalized approximately 9 percent of total interest charges versus approximately 10 percent during the prior year. These expense increases were partially offset by the repayment of our maturing $350 million 3.45% Senior Notes due 2015 and our $300 million 3.05% Senior Notes due 2016 in August 2015 and March 2016, respectively, and the retirement of a portion of the 2020 Notes, the 2021 Notes and the 2022 Notes as a result of two different tender offers during 2016.

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Interest Income and Other, Net. Interest income and other, net, decreased $36.3 million during 2016 as compared to 2015. The decrease is primarily the resultof the prior year including $30.0 million of interest income recognized in connection with the Noble Homer Ferringtonarbitration award and $5.0 million of interest received on aU.S. Internal Revenue Service (“IRS”)tax refund for the years 2006 and 2007.

Gain on extinguishment of debt, net. Gain on debt extinguishment increased $18.0 million during the year ended December 31, 2016 as compared to 2015. This increase is due to the completion of cash tender offers on our 2020 Notes, 2021 Notes and 2022 Notes during 2016, resulting in the purchase of $798.0 million of these senior notes for $774.0 million, plus accrued interest.

Income Tax Benefit (Provision). Our income tax provision decreased $268.0 million in 2016, of which $126.0 million related to the impact of impairment charges recognized in 2016, the Quadrant contract cancellation payment, the FCX Settlement, retirement of a portion of our 2020 Notes, 2021 Notes and 2022 Notes as a result of tender offers and discrete tax items in the current year and $27.0 million related to the Noble Homer Ferrington arbitration award in 2015. Excluding the impact of these items, taxes decreased by $115.0 million as a result of lower pre-tax income partially offset by a higher effective tax rate in the current year, primarily from our geographical mix of pre-tax income.

Liquidity and Capital Resources

Overview

Net cash provided by operating activities was $453.9 million for the year ended December 31, 2017 and $1.1 billion for the year ended December 31, 2016. The decrease in net cash provided by operating activities for the year ended December 31, 2017 was primarily attributable to a reduction in operating activity during 2017. We had working capital of $446.0 million and $559.3 million at December 31, 2017 and December 31, 2016, respectively.

Net cash used in investing activities for the year ended December 31, 2017 was $155.6 million as compared to $669.9 million for the year ended December 31, 2016. The variance primarily relates to lower capital expenditures related to our major projects and newbuild expenditures in the current period.

Net cash used in financing activities for the year ended December 31, 2017 was $361.2 million as compared to $242.7 million for the year ended December 31, 2016. During the current period, our primary uses of cash included the repayment of the 2017 Notes for $300.0 million and dividends paid to noncontrolling interests of approximately $56.9 million.

Our principal source of capital in the current period was cash generated from operating activities and cash on hand. Cash on hand during the current period was primarily used for the following:

• normal recurring operating expenses;

• repayment of the 2017 Notes; and

• capital expenditures.

Our currently anticipated cash flow needs, both in the short-term and long-term, may include the following:

• normal recurring operating expenses;

• planned and discretionary capital expenditures; and

• repayment of debt and interest.

We currently expect to fund these cash flow needs with cash generated by our operations, cash on hand, borrowings under our Credit Facilities (as defined below) and potential issuances of long-term debt. However, to adequately cover our expected cash flow needs, we may require capital in excess of the amount available from these sources, and we may seek additional sources of liquidity and/or delay or cancel certain discretionary capital expenditures or other payments as necessary.

At December 31, 2017, we had a total contract drilling services backlog of approximately $3.0 billion. Our backlog as of December 31, 2017 includes a commitment of 44 percent of available days for 2018. For additional information regarding our backlog, see “—Contract Drilling Services Backlog.”

Capital Expenditures

Capital expenditures, including capitalized interest, totaled $111.1 million, $659.9 million and $422.5 million for the years ended December 31, 2017, 2016 and 2015 respectively. Capital expenditures during 2017 consisted of the following:

• $58.6 million for sustaining capital and upgrades and replacements to drilling equipment;

• $39.3 million in major projects; and

• $13.2 million in subsea related expenditures.

Our total capital expenditure estimate for 2018 is approximately $148.0 million, which is currently anticipated to be spent as follows:

• $83.0 million for sustaining capital; and

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• $65.0 million for major projects, subsea related expenditures and upgrades and replacements to drilling equipment.

From time to time we consider possible projects that would require expenditures that are not included in our capital budget, and such unbudgeted expenditures could be significant. In addition, we will continue to evaluate acquisitions of drilling units from time to time. Other factors that could cause actual capital expenditures to materially exceed plan include delays and cost overruns in shipyards (including costs attributable to labor shortages), shortages of equipment, latent damage or deterioration to hull, equipment and machinery in excess of engineering estimates and assumptions, changes in governmental regulations and requirements and changes in design criteria or specifications during repair or construction.

Dividends

The declaration and payment of dividends require the authorization of the Board of Directors of Noble-UK, provided that such dividends on issued share capital may be paid only out of Noble-UK’s “distributable reserves” on its statutory balance sheet in accordance with UK laws. Therefore, Noble-UK is not permitted to pay dividends out of share capital, which includes share premiums. The resumption of the payment of future dividends will depend on our results of operations, financial condition, cash requirements, future business prospects, contractual restrictions and other factors deemed relevant by our Board of Directors.

Share Repurchases

The Company is only permitted to purchase its own shares by way of an “off-market purchase” in a plan approved by shareholders. In December 2014, we received shareholder approval to repurchase up to 37 million ordinary shares, or approximately 15 percent of our outstanding ordinary shares at the time of the shareholder approval. The authority to make such repurchases expired at the end of the Company’s 2016 annual general meeting of shareholders, which was held on April 22, 2016. During 2015, we repurchased 6.2 million of our ordinary shares covered by this authorization at an average price of $16.10 per share, excluding commissions and stamp tax, for a total cost of approximately $100.6 million. All shares repurchased were made in the open market pursuant to the share repurchase program discussed above, and all shares repurchased were immediately canceled. During the years ended December 31, 2017 and 2016, we did not repurchase any shares of our shares.

Credit Facilities and Senior Unsecured Notes

2015 Credit Facility

At December 31, 2017, we had a five-year $2.4 billion senior unsecured credit facility that matures in January 2020 and which is guaranteed by our indirect, wholly owned subsidiaries, Noble Holding (U.S.) LLC (“NHUS”) and Noble Holding International Limited (“NHIL”) (the “2015 Credit Facility”). The 2015 Credit Facility also provided us with the ability to issue up to $500.0 million in letters of credit. The issuance of letters of credit under the facility reduces the amount available for borrowing. At December 31, 2017, we had no borrowings outstanding or letters of credit issued under our 2015 Credit Facility.

On December 19, 2017, we entered into the First Amendment and Consent and Successor Agent Agreement, (the “Amendment”) amending the 2015 Credit Facility. Upon certain conditions, including the entering into of the Company's 2017 Credit Facility (as defined below), the Amendment provides for, on or after January 3, 2018, among other things (i) a reduction in the aggregate principal amount of commitments under the 2015 Credit Facility to $300.0 million and (ii) the reduction of the 2015 Credit Facility's letter of credit subfacility to zero dollars. The maturity of the 2015 Credit Facility remains January 2020.

2017 Credit Facility

On December 21, 2017, Noble Cayman Limited, a Cayman Islands company and a wholly-owned indirect subsidiary of Noble-Cayman (“NCL”); Noble International Finance Company (“NIFCO“); and Noble Holding UK Limited, a company incorporated under the laws of England and Wales and a wholly-owned direct subsidiary of Noble-UK (“NHUK”), as parent guarantor, entered into a new senior unsecured credit agreement (the “2017 Credit Facility” and together with the 2015 Credit Facility, the “Credit Facilities“). The maximum aggregate amount of borrowings under the 2017 Credit Facility of $1.5 billion became available on January 3, 2018 upon the effectiveness of the commitment reduction under the 2015 Credit Facility. Borrowings under the 2017 Credit Facility are subject to certain conditions precedent, including that there be no unused commitments to advance loans under the 2015 Credit Facility. The 2017 Credit Facility provides for a letter of credit subfacility currently in the amount of $15.0 million, with the ability to increase such amount up to $500.0 million. Borrowings may be used for working capital and other general corporate purposes. The 2017 Credit Facility has an initial maturity of up to five years from the date on which the borrowings became available, or January 3, 2023. At December 31, 2017, we had no borrowings outstanding or letters of credit issued under the 2017 Credit Facility.

Both of our Credit Facilities have provisions which vary the applicable interest rates for borrowings based upon our debt ratings. We also pay a facility fee under each of the Credit Facilities on the daily unused amount of the underlying commitment which varies depending on our

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credit ratings. At December 31, 2017, the interest rates in effect under our Credit Facilities are the highest permitted interest rates under those agreements.

Debt Issuances

On January 31, 2018, we issued and sold $750.0 million aggregate principal amount of our Senior Notes due 2026 (the “2026 Notes”), through our indirect wholly-owned subsidiary, NHIL. The 2026 Notes are issued under an indenture by and among NHIL, Noble-Cayman, certain other subsidiaries of Noble-Cayman named therein (the “Subsidiary Guarantors”), and are guaranteed by Noble-Cayman and the Guarantor Subsidiaries. The proceeds of the offering of approximately $737.0 million, after estimated expenses, were used to retire a portion of our near-term senior notes in a related tender offer.

The 2026 Notes are redeemable, in whole or in part, prior to February 1, 2021, at a redemption price equal to 100% of the aggregate principal amount of the 2026 Notes being redeemed, plus a make-whole premium. The 2026 Notes are redeemable prior to February 1, 2021, at a redemption price equal to 40% of the aggregate principal amount in the event of an equity offering. Further, the 2026 Notes may be redeemed in whole as a result of changes in tax law. On or after February 1, 2021, we may redeem all or any portion of the 2026 Notes at various redemption prices set forth in the indenture.

Upon (i) the occurrence of a change of control and (ii) a downgrade of the rating of the 2026 Notes within 60 days after the change of control by at least two of Moody’s Investors Service, Inc., Standard & Poor’s Financial Services LLC or Fitch Ratings Inc., we will be required to make an offer to repurchase all outstanding 2026 Notes at a price in cash equal to 101% of the aggregate principal amount of the 2026 Notes repurchased, plus any accrued and unpaid interest to, but excluding, the repurchase date.

The indenture for the 2026 Notes contains certain covenants and restrictions, including, among others, restrictions on our and our subsidiaries’ ability, as applicable, to create certain liens, enter into certain sale and leaseback transactions, merge or consolidate with another entity, sell all or substantially all of their assets and allow our subsidiaries to incur certain additional indebtedness. Additionally, the Subsidiary Guarantors must own, directly or indirectly, (i) assets comprising at least 85%of the revenue of Noble-Cayman and its subsidiaries on a consolidated basis and (ii) jackups, semisubmersibles, drillships, submersibles or other mobile offshore drilling units of material importance, the combined book value of which comprises at least 85% of the combined book value of all such assets of Noble-Cayman and its subsidiaries on a consolidated basis, in each case, with respect to the most recently completed fiscal year.

In December 2016, we issued $1.0 billion aggregate principal amount of Senior Notes due 2024 (the “2024 Notes”), which we issued through our indirect wholly-owned subsidiary, NHIL. The net proceeds of approximately $967.6 million, after estimated expenses, were primarily used to retire a portion of our near-term senior notes in a related tender offer and the remaining portion was used for general corporate purposes.

Senior Notes Interest Rate Adjustments

During 2016 and 2017, we experienced debt rating downgrades by Moody’s Investors Service and S&P Global Ratings, which reduced our debt ratings significantly below investment grade. As a result of these downgrades, we experienced interest rate increases during 2016 and 2017 on the 2018 Notes, the 2025 Notes and the 2045 Notes, all of which are subject to provisions that vary the applicable interest rates based on our debt rating. On October 18, 2017, S&P Global Ratings further reduced our debt rating, which will increase the interest rates on the 2025 Notes and the 2045 Notes to 7.95% and 8.95%, respectively, beginning in April 2018. Once the new interest rates take effect in April 2018, these senior notes will have reached the contractually-defined maximum interest rate set for each rating agency and no further interest rate increase will occur

Our other outstanding senior notes, including the 2024 Notes issued in December 2016 and the 2026 Notes issued in January 2018, do not contain provisions varying applicable interest rates based upon our credit ratings.

Debt Tender Offers and Repayments

In January 2018, we commenced cash tender offers for our 2018 Notes, 2019 Notes, 2020 Notes, 2021 Notes, 2022 Notes and 2024 Notes. In February 2018, we purchased $754.2 million aggregate principal amount of these senior notes for $750.0 million, plus accrued interest, using the net proceeds of the 2026 Notes issuance in January 2018 and cash on hand. As a result of these tender offers, we recognized a net loss of approximately $2.0 million. In February 2018, we completed an optional redemption of our remaining 2019 Notes. Both the tender offers and redemption are described further in “Note 19— Subsequent Events.”

In March 2017, we repaid our 2017 Notes using cash on hand. We anticipate using cash on hand to repay the outstanding balance of our 2018 Notes, maturing in March 2018.

In December 2016, we commenced cash tender offers for our 2020 Notes, 2021 Notes and 2022 Notes. On December 28, 2016, we purchased $762.3 million of these senior notes for $750.0 million, plus accrued interest, using a portion of the net proceeds of the $1.0 billion 2024 Notes issuance in December 2016. In December 2016, as a result of these tender offers, we recognized a net gain of approximately $6.7 million.

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In March 2016, we commenced cash tender offers for our 2020 Notes and our 2021 Notes. On April 1, 2016, we purchased $36.0 million of these senior notes for $24.0 million, plus accrued interest, using cash on hand. In April 2016, as a result of these tender offers, we recognized a net gain of approximately $11.1 million.

Covenants

The 2015 Credit Facility is guaranteed by NHUS and NHIL. The 2015 Credit Facility contains a covenant that limits our ratio of debt to total tangible capitalization, as defined in the 2015 Credit Facility, to 0.60. At December 31, 2017, our ratio of debt to tangible capitalization was approximately 0.43.

The 2017 Credit Facility contains certain financial covenants (as defined in the 2017 Credit Facility) applicable to NHUK and its subsidiaries, including (i) a covenant restricting debt to total tangible capitalization to not greater than 55% at the end of each fiscal quarter, (ii) a minimum Liquidity requirement of $300.0 million, (iii) a covenant that, beginning with the fiscal quarter ending March 31, 2018, the ratio of the Rig Value of Marketed Rigs to the sum of commitments under the 2017 Credit Facility plus indebtedness for borrowed money of the borrowers and guarantors, in each case, that directly own Marketed Rigs, is not less than 3:00 to 1:00 at the end of each fiscal quarter and (iv) a covenant that, beginning with the fiscal quarter ending March 31, 2018, the ratio of (A) the Rig Value of the Closing Date Rigs that are directly wholly owned by the borrowers and guarantors to (B) the Rig Value of the Closing Date Rigs owned by NHUK, subsidiaries of NHUK and certain local content affiliates, is not less than 80% at the end of each fiscal quarter (such covenants described in (iii) and (iv) of this paragraph, the “Guarantor Ratio Covenants”). The 2017 Credit Facility also includes restrictions on borrowings if, after giving effect to any such borrowings and the application of the proceeds thereof, the aggregate amount of Available Cash (as defined in the 2017 Credit Facility) would exceed $200.0 million.

NHUK has guaranteed the obligations of the borrowers under the 2017 Credit Facility. Certain other subsidiaries of Noble-UK will be required from time to time to guarantee the obligations of the borrowers under the 2017 Credit Facility in order maintain compliance with the Guarantor Ratio Covenants.

The 2017 Credit Facility contains additional covenants generally applicable to NHUK and its subsidiaries that NCL considers usual and customary for an agreement of this type, including compliance with laws (including environmental laws, ERISA and anti-corruption and sanctions laws), delivery of quarterly and annual financial statements, maintenance and operation of property, restrictions on the incurrence of liens and indebtedness, mergers and other fundamental changes, restricted payments, repurchases and redemptions of indebtedness with maturities outside of the maturity of the 2017 Credit Facility, sale and leaseback transactions and transactions with affiliates. Borrowings under the 2017 Credit Facility are subject to acceleration upon the occurrence of events of default that NCL considers usual and customary for an agreement of this type.

In addition to the covenants from the Credit Facilities noted above, the indentures governing our outstanding senior unsecured notes contain covenants that place restrictions on certain merger and consolidation transactions, unless we are the surviving entity or the other party assumes the obligations under the indenture, and on the ability to sell or transfer all or substantially all of our assets. In addition, there are restrictions on incurring debt or assuming certain liens and on entering into sale and lease-back transactions. The indenture for the 2026 Notes that we issued in January 2018 places more limitations on us and our subsidiaries than our other senior note indentures. See “—Debt Issuances” above.

At December 31, 2017, and February 20, 2018, we were in compliance with all of the debt covenants under our Credit Facilities and senior notes. We continually monitor compliance with the covenants under our Credit Facilities and senior notes and expect to remain in compliance during the remainder of 2018.

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Summary of Contractual Cash Obligations and Commitments

The following table summarizes our contractual cash obligations and commitments (in thousands):

			Payments Due by Period
			For the years ending December 31,
	Total		2018		2019		2020		2021		2022		Thereafter		Other
Contractual Cash Obligations
Debt obligations	$	4,103,797	$	250,000	$	201,695	$	167,766	$	208,675	$	125,661	$	3,150,000	$	—
Interest payments	3,525,623		264,221		249,270		242,735		229,898		224,345		2,315,154		—
Operating leases	42,609		18,720		14,046		2,564		1,853		1,586		3,840		—
Pension plan contributions	145,613		12,623		12,093		12,643		16,778		15,890		75,586		—
Tax reserves (1)	191,860		—		—		—		—		—		—		191,860
Total contractual cash obligations	$	8,009,502	$	545,564	$	477,104	$	425,708	$	457,204	$	367,482	$	5,544,580	$	191,860

⁽¹⁾  Tax reserves are included in “Other” due to the difficulty in making reasonably reliable estimates of the timing of cash settlements to taxing authorities. See “Note 10— Income Taxes” to our accompanying consolidated financial statements.

At December 31, 2017, we had other commitments that we are contractually obligated to fulfill with cash if the obligations are called. These obligations include letters of credit that guarantee our performance as it relates to our drilling contracts, tax and other obligations in various jurisdictions. These letters of credit obligations are not normally called, as we typically comply with the underlying performance requirement.

The following table summarizes our other commercial commitments at December 31, 2017 (in thousands):

			Amount of Commitment Expiration Per Period
	Total		2018		2019		2020		2021		2022		Thereafter
Total letters of credit and commercial commitments	$	7,846	$	2,231	$	2,038	$	25	$	—	$	—	$	3,552

Critical Accounting Policies

We consider the following to be our critical accounting policies and estimates since they are very important to the understanding of our financial condition and results and require our most subjective and complex judgments.  We have discussed the development, selection and disclosure of such policies and estimates with the Audit Committee of our Board of Directors.  For a discussion of our significant accounting policies, refer to Part II, Item 8, “Note 1— Organization and Significant Accounting Policies.”

We prepare our consolidated financial statements in accordance with accounting principles generally accepted in the U.S. (“GAAP”), which require us to make estimates that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures of contingent assets and liabilities.  These estimates require significant judgments and assumptions.  We base our estimates on historical experience and on various other assumptions that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying amounts of assets and liabilities that are not readily apparent from other sources.  Actual results may differ from these estimates.

Principles of Consolidation

The consolidated financial statements include our accounts, those of our wholly-owned subsidiaries and entities in which we hold a controlling financial interest. Our consolidated financial statements include the accounts of two joint ventures, in each of which we own a 50 percent interest. Our ownership interest meets the definition of variable interest under Financial Accounting Standards Board (“FASB”) codification and we have determined that we are the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.

The combined carrying amount of the Bully-class drillships at December 31, 2017 and 2016 totaled $1.3 billion and $1.4 billion, respectively. These assets were primarily funded through partner equity contributions. Cash held by the Bully joint ventures totaled approximately $41.6 million at December 31, 2017 as compared to approximately $34.7 million at December 31, 2016.

Basis of Presentation-U.K. Companies Act 2006 Section 435 Statement

The accompanying consolidated financial statements have been prepared in accordance with US GAAP, which the Board of Directors consider to be the most meaningful presentation of our results of operations and financial position. The accompanying consolidated financial statements do not constitute statutory accounts required by the UK Companies Act 2006 (“Companies Act”), which will be prepared in accordance

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with International Financial Reporting Standards, as adopted by the European Union and delivered to the Registrar of Companies in the UK following the annual general meeting of shareholders.

Property and Equipment

Property and equipment is stated at cost, reduced by provisions to recognize economic impairment in value whenever events or changes in circumstances indicate an asset’s carrying value may not be recoverable. At December 31, 2017 and 2016, we had $83.5 million and $112 million of construction-in-progress, respectively. Such amounts are included in “Property and equipment, at cost” in the accompanying Consolidated Balance Sheets. Major replacements and improvements are capitalized. When assets are sold, retired or otherwise disposed of, the cost and related accumulated depreciation are eliminated from the accounts and the gain or loss is recognized. Drilling equipment and facilities are depreciated using the straight-line method over their estimated useful lives as of the date placed in service or date of major refurbishment. Estimated useful lives of our drilling equipment range from three to thirty years. Other property and equipment is depreciated using the straight-line method over useful lives ranging from two to forty years.

Interest is capitalized on construction-in-progress using the weighted average cost of debt outstanding during the period of construction. During the year ended December 31, 2017, there was no capitalized interest due to the completion of our newbuild program. Capitalized interest was $22.4 million and$25.0 million for the years ended December 31, 2016 and 2015, respectively.

Scheduled maintenance of equipment is performed based on the number of hours operated in accordance with our preventative maintenance program. Routine repair and maintenance costs are charged to expense as incurred; however, the costs of the overhauls and asset replacement projects that benefit future periods and which typically occur every three to five years are capitalized when incurred and depreciated over an equivalent period. These overhauls and asset replacement projects are included in “Property and equipment, at cost” in the Consolidated Balance Sheets. Such amounts, net of accumulated depreciation, totaled $149.3 million and $187.0 million at December 31, 2017 and 2016, respectively. Depreciation expense from continuing operations related to overhauls and asset replacement totaled $79.2 million, $86.0 million and $75.0 million for the years ended December 31, 2017, 2016 and 2015, respectively.

We evaluate the impairment of property and equipment whenever events or changes in circumstances (including the decision to cold stack, retire or sell a rig) indicate that the carrying amount of an asset may not be recoverable. An impairment loss on our property and equipment may exist when the estimated undiscounted cash flows expected to result from the use of the asset and its eventual disposition are less than its carrying amount. Any impairment loss recognized represents the excess of the asset's carrying value over the estimated fair value. As part of this analysis, we make assumptions and estimates regarding future market conditions. To the extent actual results do not meet our estimated assumptions, for a given rig or piece of equipment, we may take an impairment loss in the future.

During the years ended December 31, 2017, 2016 and 2015 we recognized a non-cash loss on impairment of $121.6 million, $1.5 billion, and $418.3 million, respectively, related to our long-lived assets. See Part II, Item 7, “Management Discussion and Analysis— Executive Overview,” and Part II, Item 8, “Financial Statements and Supplementary Data, Note 6— Impairment,” for additional information.

Revenue Recognition

Our typical dayrate drilling contracts require our performance of a variety of services for a specified period of time. We determine progress towards completion of the contract by measuring efforts expended and the cost of services required to perform under a drilling contract, as the basis for our revenue recognition. Revenues generated from our dayrate-basis drilling contracts and labor contracts are recognized on a per day basis as services are performed and begin upon the contract commencement, as defined under the specified drilling contract. Dayrate revenues are typically earned, and contract drilling expenses are typically incurred ratably over the term of our drilling contracts. We review and monitor our performance under our drilling contracts to confirm the basis for our revenue recognition. Revenues from bonuses are recognized when earned, and when collectability is reasonably assured.

In our dayrate drilling contracts, we typically receive compensation and incur costs for mobilization, equipment modification or other activities prior to the commencement of a contract. Any such compensation may be paid through a lump-sum payment or other daily compensation. Pre-contract compensation and costs are deferred until the contract commences. The deferred pre-contract compensation and costs are amortized, using the straight-line method, into income or loss over the term of the initial contract period, regardless of the activity taking place. This approach is consistent with the economics for which the parties have contracted. Once a contract commences, we may conduct various activities, including drilling and well bore related activities, rig maintenance and equipment installation, movement between well locations or other activities.

Deferred revenues from drilling contracts totaled $114.3 million and $134.4 million at December 31, 2017 and 2016, respectively. Such amounts are included in either “Other current liabilities” or “Other liabilities” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition. Related expenses deferred under drilling contracts totaled $55.7 million at December 31, 2017 as compared to $72.8 million at December 31, 2016 and are included in either “Prepaid expenses and other current assets,” “Other assets,” or “Property and equipment, net” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

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In April 2015, we agreed to contract dayrate reductions for five rigs working for Saudi Aramco. Given current market conditions and based on discussions with the customer, we do not expect the rates for the rigs currently working for Saudi Aramco to return to the original contract rates during the remaining contract terms. In accordance with accounting guidance, we are recognizing the rate reductions on a straight-line basis over the remaining life of these Saudi Aramco contracts. At December 31, 2017 and 2016, two of the five original rigs had revenues recorded in excess of billings as a result of this recognition which totaled $6.9 million and $17.9 million, respectively, and are included in either “Prepaid expenses and other current assets” or “Other assets” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

We record reimbursements from customers for “out-of-pocket” expenses as revenues and the related direct cost as operating expenses.

Income Taxes

We operate in a number of countries throughout the world and our tax returns filed in those jurisdictions are subject to review and examination by tax authorities within those jurisdictions. We recognize uncertain tax positions that we believe have a greater than 50 percent likelihood of being sustained. We cannot predict or provide assurance as to the ultimate outcome of any existing or future assessments. Our net deferred tax asset balance at year-end reflects the application of our income tax accounting policies and is based on management’s estimates, judgments and assumptions regarding realizability. If it is more likely than not that a portion of the deferred tax assets will not be realized in a future period, the deferred tax assets will be reduced by a valuation allowance based on management’s estimates. The company has adopted an accounting policy to look through the outside basis of partnerships and all other flow-through entities and exclude these from the computation of deferred taxes.

During 2014, the IRS began its examination of our tax reporting in the U.S. for the taxable years ended December 31, 2010 and 2011. The IRS examination team has completed its examination of our 2010 and 2011 U.S. tax returns and proposed adjustments and deficiencies with respect to certain items that were reported by us for the 2010 and 2011 tax years. On December 19, 2016, we received the Revenue Agent Report (“RAR”) from the IRS. We believe that we have accurately reported all amounts in our tax returns, and have submitted administrative protests with the IRS Office of Appeals contesting the examination team’s proposed adjustments. We intend to vigorously defend our reported positions, and believe the ultimate resolution of the adjustments proposed by the IRS examination team will not have a material adverse effect on our consolidated financial statements. During the third quarter of 2017, the IRS initiated its examination of our 2012, 2013, 2014 and 2015 tax returns.

In previous periods, we reported that Mexican and Brazilian authorities had made significant tax assessments against Paragon Offshore entities, a portion of which related to Noble’s business that operated through Paragon Offshore-retained entities in Mexico and Brazil prior to the Spin-off. As a result of the termination of the Separation Agreements, we no longer have any indemnity obligations in respect of these tax claims made against Paragon Offshore entities, and responsibility for these claims has reverted back to the applicable Paragon Offshore entity. Audit claims of approximately $48.3 million attributable to income and other business taxes have been assessed against Noble entities in Mexico.

In previous periods, we also reported that Petrobras had notified us that it was challenging assessments by Brazilian tax authorities of withholding taxes associated with the provision of drilling rigs for its operations in Brazil during 2008 and 2009. Petrobras had also notified us that if Petrobras was ultimately forced to pay such withholding taxes, it would seek reimbursement from Paragon Offshore who would then seek reimbursement from us for the portion of the withholding that was allocable to our drilling rigs. As a result of the termination of the Separation Agreements, we no longer have any indemnity obligation in respect of these withholding claims made against a Paragon Offshore entity, and responsibility for these claims has reverted back to the applicable Paragon Offshore entity.

On December 22, 2017, the President of the United States signed the into law legislation informally known as the Tax Cuts and Job Act (the “Act”). The Act represents major tax reform legislation that, among other provisions, reduces the U.S. corporate tax rate. The Company recognized the income tax effects of the Act in its 2017 financial statements, including $109.0 million of tax benefit recorded principally due to the write-down of our net deferred tax liabilities, in accordance with Accounting Standards Codification ("ASC") Topic 740, Income Taxes, in the reporting period in which the Act was enacted. Based on guidance issued from Staff Accounting Bulletin No. 118 ("SAB 118"), the Company has not provided provisional estimates for items in which the accounting for certain income tax effects of the Act is incomplete and as such, the Company will continue to apply ASC 740 on the basis of the laws in effect immediately before the enactment of the Act. For more information on the Act and its effect on our consolidated financial statements, see Part II, Item 8, “Note 10— Income Taxes.”

The Act introduces a new anti-deferral provision, which subjects a U.S. parent shareholder to current tax on certain income referred to as Global Intangible Low-Taxed Income (“GILTI”), of its foreign subsidiaries. The company has not made any adjustments related to potential GILTI tax in its financial statements and has adopted a policy to treat tax due on future U.S. inclusions in taxable income as period costs when incurred.

Insurance Reserves

We maintain various levels of self-insured retention for certain losses including property damage, loss of hire, employment practices liability, employers’ liability and general liability, among others. We accrue for property damage and loss of hire charges on a per event basis.

Employment practices liability claims are accrued based on actual claims during the year. Maritime employer’s liability claims are generally estimated using actuarial determinations. General liability claims are estimated by our internal claims department by evaluating the facts and

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circumstances of each claim (including incurred but not reported claims) and making estimates based upon historical experience with similar claims. At December 31, 2017 and 2016, loss reserves for personal injury and protection claims totaled $22.0 million and $22.1 million, respectively, and such amounts are included in “Other current liabilities” in the accompanying Consolidated Balance Sheets.

Certain Significant Estimates and Contingent Liabilities

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Certain accounting policies involve judgments and uncertainties to such an extent that there is reasonable likelihood that materially different amounts could have been reported under different conditions, or if different assumptions had been used. We evaluate our estimates and assumptions on a regular basis. We base our estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates and assumptions used in preparation of our consolidated financial statements. We follow FASB standards regarding contingent liabilities, which are discussed in Part II, Item 8, "Financial Statements and Supplementary Data, “Note 14— Commitments and Contingencies.”

Off-Balance Sheet Arrangements

We have no off-balance sheet arrangements as that term is defined in Item 303(a)(4)(ii) of Regulation S-K.

New Accounting Pronouncements

See Part II, Item 8, “Financial Statements and Supplementary Data, Note 1— Organization and Significant Accounting Policies,” to the Consolidated Financial Statements for a description of the recent accounting pronouncements.

Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

Market risk is the potential for loss due to a change in the value of a financial instrument as a result of fluctuations in interest rates, currency exchange rates or equity prices, as further described below.

Interest Rate Risk

We are subject to market risk exposure related to changes in interest rates on borrowings under the Credit Facilities. Interest on borrowings under our Credit Facilities is at an agreed upon percentage point spread over LIBOR, or a base rate stated in the agreements. At December 31, 2017, we had no borrowings outstanding under our Credit Facilities.

During 2017 and 2016, we experienced debt rating downgrades by Moody’s Investors Service and S&P Global Ratings, which reduced our debt ratings significantly below investment grade. As a result of these downgrades, we experienced interest rate increases during 2017 and 2016 on the 2018 Notes, 2025 Notes and 2045 Notes, all of which are subject to provisions that vary the applicable interest rates based on our debt rating. On October 18, 2017 S&P Global Ratings further reduced our debt rating, which will increase the interest rates on the 2025 Notes and 2045 Notes to 7.95% and 8.95%, respectively, beginning in April 2018. Once the new interest rates take effect in April 2018, these senior notes will have reached the contractually-defined maximum interest rate set for each rating agency and no further interest rate increase will occur.

Our other outstanding senior notes, including the 2024 Notes issued in December 2016, and 2026 Notes issued in January 2018, do not contain provisions varying applicable interest rates based upon our credit ratings.

We maintain certain debt instruments at a fixed rate whose fair value will fluctuate based on changes in market expectations for interest rates and perceptions of our credit risk. The fair value of our total debt was $3.4 billion and $3.8 billion at December 31, 2017 and December 31, 2016, respectively. The decrease in the fair value of debt relates to the maturity of our 2017 Notes and changes in market expectations for interest rates and perceptions of our credit risk.

Foreign Currency Risk

Although we are a UK company, we define foreign currency as any non-U.S. denominated currency. Our functional currency is primarily the U.S. Dollar, which is consistent with the oil and gas industry. However, outside the United States, a portion of our expenses are incurred in local currencies. Therefore, when the U.S. Dollar weakens (strengthens) in relation to the currencies of the countries in which we operate, our expenses reported in U.S. Dollars will increase (decrease).

We are exposed to risks on future cash flows to the extent that local currency expenses exceed revenues denominated in local currency that are other than the functional currency. To help manage this potential risk, we periodically enter into derivative instruments to manage our exposure to fluctuations in currency exchange rates, and we may conduct hedging activities in future periods to mitigate such exposure. These contracts are

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primarily accounted for as cash flow hedges, with the effective portion of changes in the fair value of the hedge recorded on the Consolidated Balance Sheet and in “Accumulated other comprehensive income (loss)” (“AOCI”). Amounts recorded in AOCI are reclassified into earnings in the same period or periods that the hedged item is recognized in earnings. The ineffective portion of changes in the fair value of the hedged item is recorded directly to earnings. We have documented policies and procedures to monitor and control the use of derivative instruments. We do not engage in derivative transactions for speculative or trading purposes, nor are we a party to leveraged derivatives.

Several of our regional shorebases, including our North Sea operations, have a significant amount of their cash operating expenses payable in local currencies. To limit the potential risk of currency fluctuations, we periodically enter into forward contracts, which settle monthly in the operations’ respective local currencies. All of these contracts have a maturity of less than 12 months. During 2017 and 2016, we entered into forward contracts of approximately $37.6 million and $53.1 million, respectively, all of which settled during their respective years. At both December 31, 2017 and 2016, we had no outstanding derivative contracts.

Market Risk

We have a U.S. noncontributory defined benefit pension plan that covers certain salaried employees and a U.S. noncontributory defined benefit pension plan that covers certain hourly employees, whose initial date of employment is prior to August 1, 2004 (collectively referred to as our “qualified U.S. plans”). These plans are governed by the Noble Drilling Employees’ Retirement Trust. The benefits from these plans are based primarily on years of service and, for the salaried plan, employees’ compensation near retirement. These plans are designed to qualify under the Employee Retirement Income Security Act of 1974 (“ERISA”), and our funding policy is consistent with funding requirements of ERISA and other applicable laws and regulations. We make cash contributions, or utilize credits available to us, for the qualified U.S. plans when required. The benefit amount that can be covered by the qualified U.S. plans is limited under ERISA and the Internal Revenue Code (“IRC”) of 1986. Therefore, we maintain an unfunded, nonqualified excess benefit plan designed to maintain benefits for specified employees at the formula level in the qualified salary U.S. plan. We refer to the qualified U.S. plans and the excess benefit plan collectively as the “U.S. plans.”

In addition to the U.S. plans, each of Noble Drilling (Land Support) Limited and Noble Resources Limited, both indirect, wholly-owned subsidiaries of Noble-UK, maintains a pension plan that covers all of its salaried, non-union employees, whose most recent date of employment is prior to April 1, 2014 (collectively referred to as our “non-U.S. plans”). Benefits are based on credited service and employees’ compensation, as defined by the plans.

Changes in market asset values related to the pension plans noted above could have a material impact upon our Consolidated Statement of Comprehensive Income (Loss) and could result in material cash expenditures in future periods.

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Item 8. Financial Statements and Supplementary Data.

The following financial statements are filed in this Item 8: 

	Page
Report of Independent Registered Public Accounting Firm (Noble-UK)	47
Noble Corporation plc (Noble-UK) and Subsidiaries Consolidated Balance Sheet as of December 31, 2017 and 2016	49
Noble Corporation plc (Noble-UK) and Subsidiaries Consolidated Statements of Operations for the Years Ended December 31, 2017, 2016 and 2015	50
Noble Corporation plc (Noble-UK) and Subsidiaries Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2017, 2016 and 2015	51
Noble Corporation plc (Noble-UK) and Subsidiaries Consolidated Statements of Cash Flows for the Years Ended December 31, 2017, 2016 and 2015	52
Noble Corporation plc (Noble-UK) and Subsidiaries Consolidated Statements of Equity for the Years Ended December 31, 2017, 2016 and 2015	53
Report of Independent Registered Public Accounting Firm (Noble-Cayman)	54
Noble Corporation (Noble-Cayman) and Subsidiaries Consolidated Balance Sheet as of December  31, 2017 and 2016	56
Noble Corporation (Noble-Cayman) and Subsidiaries Consolidated Statements of Operations for the Years Ended December 31, 2017, 2016 and 2015	57
Noble Corporation (Noble-Cayman) and Subsidiaries Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2017, 2016 and 2015	58
Noble Corporation (Noble-Cayman) and Subsidiaries Consolidated Statements of Cash Flows for the Years Ended December 31, 2017, 2016 and 2015	59
Noble Corporation (Noble-Cayman) and Subsidiaries Consolidated Statements of Equity for the Years Ended December 31, 2017, 2016 and 2015	60
Notes to Consolidated Financial Statements	61

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Tothe Board of Directors and

Shareholders of Noble Corporation plc

Opinions on the Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying consolidated balance sheets of Noble Corporation plc and its subsidiaries (the “Company”) as of December 31, 2017 and 2016, and the related consolidated statements of operations, comprehensive income (loss), cash flows, and equity for each of the three years in the period ended December 31, 2017, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2017 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Basis for Opinions

The Company's management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in Management's Annual Report on Internal Control Over Financial Reporting as appearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company's internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

47

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Houston, Texas

February 23, 2018

We have served as the Company’s auditor since 1994.

48

NOBLE CORPORATION PLC AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	December 31, 2017			December 31, 2016
ASSETS
Current assets
Cash and cash equivalents	$	662,829		$	725,722
Accounts receivable, net	204,696			319,152
Taxes receivable	105,345			55,480
Prepaid expenses and other current assets	66,105			92,260
Total current assets	1,038,975			1,192,614
Property and equipment, at cost	12,034,331			12,364,888
Accumulated depreciation	(2,545,091		)	(2,302,940		)
Property and equipment, net	9,489,240			10,061,948
Other assets	266,444			185,555
Total assets	$	10,794,659		$	11,440,117
LIABILITIES AND EQUITY
Current liabilities
Current maturities of long-term debt	$	249,843		$	299,882
Accounts payable	84,032			108,224
Accrued payroll and related costs	54,904			48,383
Taxes payable	34,391			46,561
Interest payable	98,189			61,299
Other current liabilities	71,665			68,944
Total current liabilities	593,024			633,293
Long-term debt	3,795,867			4,040,229
Deferred income taxes	164,962			2,084
Other liabilities	290,178			297,066
Total liabilities	4,844,031			4,972,672
Commitments and contingencies (Note 14)
Shareholders' equity
Common stock, $0.01 par value, ordinary shares; 244,971 and 243,239 shares outstanding as of December 31, 2017 and December 31, 2016, respectively.	2,450			2,432
Additional paid-in capital	678,922			654,168
Retained earnings	4,637,677			5,154,221
Accumulated other comprehensive loss	(42,888		)	(52,140		)
Total shareholders' equity	5,276,161			5,758,681
Noncontrolling interests	674,467			708,764
Total equity	5,950,628			6,467,445
Total liabilities and equity	$	10,794,659		$	11,440,117

See accompanying notes to the consolidated financial statements.

49

NOBLE CORPORATION PLC AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Year Ended December 31,
	2017			2016			2015
Operating revenues
Contract drilling services	$	1,207,026		$	2,242,200		$	3,261,610
Reimbursables and other	29,889			59,865			90,642
	1,236,915			2,302,065			3,352,252
Operating costs and expenses
Contract drilling services	640,489			879,438			1,232,529
Reimbursables	18,435			45,499			70,276
Depreciation and amortization	547,990			611,067			634,305
General and administrative	71,634			69,258			76,843
Loss on impairment	121,639			1,458,749			418,298
	1,400,187			3,064,011			2,432,251
Operating income (loss)	(163,272		)	(761,946		)	920,001
Other income (expense)
Interest expense, net of amount capitalized	(291,989		)	(222,915		)	(213,854		)
Gain on extinguishment of debt, net	—			17,814			—
Interest income and other, net	5,449			18			36,286
Income (loss) from continuing operations before income taxes	(449,812		)	(967,029		)	742,433
Income tax benefit (provision)	(42,629		)	109,156			(159,232		)
Net income (loss) from continuing operations	(492,441		)	(857,873		)	583,201
Net income (loss) from discontinued operations, net of tax	(1,486		)	—			—
Net income (loss)	(493,927		)	(857,873		)	583,201
Net (income) attributable to noncontrolling interests	(22,584		)	(71,707		)	(72,201		)
Net income (loss) attributable to Noble Corporation plc	$	(516,511	)	$	(929,580	)	$	511,000
Net income (loss) attributable to Noble Corporation plc
Income (loss) from continuing operations	$	(515,025	)	$	(929,580	)	$	511,000
Net loss from discontinued operations, net of tax	(1,486		)	—			—
Net income (loss) attributable to Noble Corporation plc	$	(516,511	)	$	(929,580	)	$	511,000
Per share data
Basic:
Income (loss) from continuing operations	$	(2.10	)	$	(3.82	)	$	2.06
(Loss) from discontinued operations	(0.01		)	—			—
Net income (loss) attributable to Noble Corporation plc	$	(2.11	)	$	(3.82	)	$	2.06
Diluted:
Income (loss) from continuing operations	$	(2.10	)	$	(3.82	)	$	2.06
(Loss) from discontinued operations	(0.01		)	—			—
Net income (loss) attributable to Noble Corporation plc	$	(2.11	)	$	(3.82	)	$	2.06
Weighted- Average Shares Outstanding
Basic	244,743			243,127			242,146
Diluted	244,743			243,127			247,402

See accompanying notes to the consolidated financial statements.

50

NOBLE CORPORATION PLC AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Year Ended December 31,
	2017			2016			2015
Net income (loss)	$	(493,927	)	$	(857,873	)	$	583,201
Other comprehensive income (loss)
Foreign currency translation adjustments	990			(19		)	(5,278		)
Net pension plan gain (loss) (net of tax provision (benefit) of   $523, ($1,828) and $4,021 for the year ended December 31, 2017, 2016 and 2015, respectively)	6,774			(8,237		)	7,099
Amortization of deferred pension plan amounts (net of tax provision of $623, $1,635 and $2,297 for the year ended December 31, 2017, 2016 and 2015, respectively)	1,393			3,127			4,422
Net pension plan curtailment and settlement expense (net of tax    provision of zero, $7,218 and zero for the year ended December 31, 2017, 2016 and 2015, respectively)	95			15,216			—
Prior service cost arising during the period (net of tax provision of zero, $344 and zero for the year ended December 31, 2017, 2016 and 2015, respectively)	—			948			—
Other comprehensive income, net	9,252			11,035			6,243
Net comprehensive (income) attributable to noncontrolling interests	(22,584		)	(71,707		)	(72,201		)
Comprehensive income (loss) attributable to Noble Corporation plc	$	(507,259	)	$	(918,545	)	$	517,243

See accompanying notes to the consolidated financial statements.

51

NOBLE CORPORATION PLC AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Year Ended December 31,
	2017			2016			2015
Cash flows from operating activities
Net income (loss)	$	(493,927	)	$	(857,873	)	$	583,201
Adjustments to reconcile net income to net cash flow from operating activities:
Depreciation and amortization	547,990			611,067			634,305
Loss on impairment	121,639			1,458,749			418,298
Gain on extinguishment of debt, net	—			(17,814		)	—
Deferred income taxes	241,326			(189,897		)	(36,172		)
Amortization of share-based compensation	29,115			34,720			39,172
Other long-term asset write-off	29,032			—			—
Net change in other assets and liabilities	(21,237		)	87,124			126,103
Net cash provided by operating activities	453,938			1,126,076			1,764,907
Cash flows from investing activities
Capital expenditures	(111,140		)	(659,925		)	(422,544		)
Change in accrued capital expenditures	(46,830		)	(34,814		)	(14,607		)
Proceeds from disposal of assets	2,382			24,808			4,614
Net cash used in investing activities	(155,588		)	(669,931		)	(432,537		)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	—			—			(1,123,495		)
Issuance of senior notes	—			980,100			1,092,728
Repayments of debt	(300,000		)	(1,049,338		)	(350,000		)
Debt issuance costs on senior notes and credit facility	(42		)	(12,111		)	(16,070		)
Dividend payments	—			(47,534		)	(315,534		)
Dividends paid to noncontrolling interests	(56,881		)	(85,944		)	(71,504		)
Repurchases of shares	—			—			(100,630		)
Tender offer premium	—			(24,649		)	—
Employee stock transactions	(4,320		)	(3,192		)	(4,130		)
Net cash used in financing activities	(361,243		)	(242,668		)	(888,635		)
Net increase (decrease) in cash and cash equivalents	(62,893		)	213,477			443,735
Cash and cash equivalents, beginning of period	725,722			512,245			68,510
Cash and cash equivalents, end of period	$	662,829		$	725,722		$	512,245

See accompanying notes to the consolidated financial statements.

52

NOBLE CORPORATION PLC AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF EQUITY

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Shares					Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Noncontrolling Interests			Total Equity
	Balance		Par Value
Balance at December 31, 2014	247,501		$	2,475		$	695,638		$	5,936,035		$	(69,418	)	$	722,304		$	7,287,034
Employee related equity activity
Amortization of share-based compensation	—		—			39,172			—			—			—			39,172
Issuance of share-based compensation shares	685		7			(4,178		)	—			—			—			(4,171		)
Tax benefit of equity transactions	—		—			(1,581		)	—			—			—			(1,581		)
Repurchases of shares	(6,209	)	(62		)	(100,568		)	—			—			—			(100,630		)
Net income	—		—			—			511,000			—			72,201			583,201
Dividends paid to noncontrolling interests	—		—			—			—			—			(71,504		)	(71,504		)
Dividends	—		—			—			(315,534		)	—			—			(315,534		)
Other comprehensive income, net	—		—			—			—			6,243			—			6,243
Balance at December 31, 2015	241,977		$	2,420		$	628,483		$	6,131,501		$	(63,175	)	$	723,001		$	7,422,230
Employee related equity activity
Amortization of share-based compensation	—		—			34,720			—			—			—			34,720
Issuance of share-based compensation shares	1,262		12			(3,625		)	—			—			—			(3,613		)
Tax benefit of equity transactions	—		—			(5,410		)	—			—			—			(5,410		)
Net income (loss)	—		—			—			(929,580		)	—			71,707			(857,873		)
Dividends paid to noncontrolling interests	—		—			—			—			—			(85,944		)	(85,944		)
Dividends	—		—			—			(47,700		)	—			—			(47,700		)
Other comprehensive income, net	—		—			—			—			11,035			—			11,035
Balance at December 31, 2016	243,239		$	2,432		$	654,168		$	5,154,221		$	(52,140	)	$	708,764		$	6,467,445
Employee related equity activity
Amortization of share-based compensation	—		—			29,115			—			—			—			29,115
Issuance of share-based compensation shares	1,732		18			(23		)	—			—			—			(5		)
Shares withheld for taxes on equity transactions	—		—			(4,338		)	—			—			—			(4,338		)
Net income (loss)	—		—			—			(516,511		)	—			22,584			(493,927		)
Dividends paid to noncontrolling interests	—		—			—			—			—			(56,881		)	(56,881		)
Dividends equivalents (1)	—		—			—			(33		)	—			—			(33		)
Other comprehensive income, net	—		—			—			—			9,252			—			9,252
Balance at December 31, 2017	244,971		$	2,450		$	678,922		$	4,637,677		$	(42,888	)	$	674,467		$	5,950,628

⁽¹⁾  Activity associated with dividend equivalents, which are related to 2016 performance awards to be paid upon vesting.

See accompanying notes to the consolidated financial statements.

53

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Tothe Board of Directors and

Shareholder of Noble Corporation

Opinions on the Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying consolidated balance sheets of Noble Corporation and its subsidiaries (the “Company”) as of December 31, 2017 and 2016, and the related consolidated statements of operations, comprehensive income (loss), cash flows, and equity for each of the three years in the period ended December 31, 2017, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2017 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Basis for Opinions

The Company's management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in Management's Annual Report on Internal Control Over Financial Reporting as appearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company's internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

54

/s/ PricewaterhouseCoopers LLP

Houston, Texas

February 23, 2018

We have served as the Company’s auditor since 1994.

55

NOBLE CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	December 31, 2017			December 31, 2016
ASSETS
Current assets
Cash and cash equivalents	$	662,011		$	653,833
Accounts receivable, net	204,696			319,152
Taxes receivable	105,345			55,480
Prepaid expenses and other current assets	65,441			88,749
Total current assets	1,037,493			1,117,214
Property and equipment, at cost	12,034,331			12,364,888
Accumulated depreciation	(2,545,091		)	(2,302,940		)
Property and equipment, net	9,489,240			10,061,948
Other assets	266,528			178,552
Total assets	$	10,793,261		$	11,357,714
LIABILITIES AND EQUITY
Current liabilities
Current maturities of long-term debt	$	249,843		$	299,882
Accounts payable	83,873			107,868
Accrued payroll and related costs	54,904			48,319
Taxes payable	33,965			46,561
Interest payable	98,189			61,299
Other current liabilities	71,466			67,312
Total current liabilities	592,240			631,241
Long-term debt	3,795,867			4,040,229
Deferred income taxes	164,962			2,084
Other liabilities	290,178			292,183
Total liabilities	4,843,247			4,965,737
Commitments and contingencies (Note 14)
Shareholder equity
Common stock, $0.01 par value, ordinary shares; 261,246 shares outstanding as of December 31, 2017 and December 31, 2016	26,125			26,125
Capital in excess of par value	623,137			594,091
Retained earnings	4,669,173			5,115,137
Accumulated other comprehensive loss	(42,888		)	(52,140		)
Total shareholder equity	5,275,547			5,683,213
Noncontrolling interests	674,467			708,764
Total equity	5,950,014			6,391,977
Total liabilities and equity	$	10,793,261		$	11,357,714

See accompanying notes to the consolidated financial statements.

56

NOBLE CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Year Ended December 31,
	2017			2016			2015
Operating revenues
Contract drilling services	$	1,207,026		$	2,242,200		$	3,261,610
Reimbursables and other	29,889			60,565			90,842
	1,236,915			2,302,765			3,352,452
Operating costs and expenses
Contract drilling services	638,035			873,661			1,226,377
Reimbursables	18,435			45,499			70,276
Depreciation and amortization	543,119			611,013			633,244
General and administrative	41,087			46,045			55,435
Loss on impairment	121,639			1,458,749			418,298
	1,362,315			3,034,967			2,403,630
Operating income (loss)	(125,400		)	(732,202		)	948,822
Other income (expense)
Interest expense, net of amount capitalized	(291,989		)	(222,915		)	(213,854		)
Gain on extinguishment of debt, net	—			17,814			—
Interest income and other, net	5,285			133			34,664
Income (loss) from continuing operations before income taxes	(412,104		)	(937,170		)	769,632
Income tax benefit (provision)	(42,595		)	109,163			(162,620		)
Net income (loss) from continuing operations	(454,699		)	(828,007		)	607,012
Net income from discontinued operations, net of tax	2,967			—			—
Net income (loss)	(451,732		)	(828,007		)	607,012
Net income attributable to noncontrolling interests	(22,584		)	(71,707		)	(72,201		)
Net income (loss) attributable to Noble Corporation	$	(474,316	)	$	(899,714	)	$	534,811

See accompanying notes to the consolidated financial statements.

57

NOBLE CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Year Ended December 31,
	2017			2016			2015
Net income (loss)	$	(451,732	)	$	(828,007	)	$	607,012
Other comprehensive income (loss)
Foreign currency translation adjustments	990			(19		)	(5,278		)
Net pension plan gain (loss) (net of tax provision (benefit) of    $523, ($1,828) and $4,021 for the year ended December 31, 2017, 2016 and 2015, respectively)	6,774			(8,237		)	7,099
Amortization of deferred pension plan amounts (net of tax provision of $623, $1,635 and $2,297 for the year ended December 31, 2017, 2016 and 2015, respectively)	1,393			3,127			4,422
Net pension plan curtailment and settlement expense (net of tax    provision (benefit) of zero, $7,218 and zero for the year ended December 31, 2017, 2016 and 2015, respectively)	95			15,216			—
Prior service cost arising during the period (net of tax provision of zero, $344 and zero for the year ended December 31, 2017, 2016 and 2015, respectively)	—			948			—
Other comprehensive income, net	9,252			11,035			6,243
Net comprehensive (income) attributable to noncontrolling interests	(22,584		)	(71,707		)	(72,201		)
Comprehensive income (loss) attributable to Noble Corporation	$	(465,064	)	$	(888,679	)	$	541,054

See accompanying notes to the consolidated financial statements.

58

NOBLE CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Year Ended December 31,
	2017			2016			2015
Cash flows from operating activities
Net income (loss)	$	(451,732	)	$	(828,007	)	$	607,012
Adjustments to reconcile net income to net cash flow from operating activities:
Depreciation and amortization	543,119			611,013			633,244
Loss on impairment	121,639			1,458,749			418,298
Gain on extinguishment of debt, net	—			(17,814		)	—
Deferred income taxes	241,326			(189,897		)	(34,108		)
Amortization of share-based compensation	29,046			32,782			30,652
Other long-term asset write-off	29,030			—			—
Net change in other assets and liabilities	(20,091		)	89,445			92,409
Net cash provided by operating activities	492,337			1,156,271			1,747,507
Cash flows from investing activities
Capital expenditures	(111,140		)	(659,925		)	(422,544		)
Change in accrued capital expenditures	(46,830		)	(34,814		)	(14,607		)
Proceeds from disposal of assets	2,382			24,808			4,614
Net cash used in investing activities	(155,588		)	(669,931		)	(432,537		)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	—			—			(1,123,495		)
Issuance of senior notes	—			980,100			1,092,728
Repayments of debt	(300,000		)	(1,049,338		)	(350,000		)
Debt issuance costs on senior notes and credit facility	(42		)	(12,111		)	(16,070		)
Tender offer premium	—			(24,649		)	—
Dividends paid to noncontrolling interests	(56,881		)	(85,944		)	(71,504		)
Contributions (distributions) from (to) parent company, net	28,352			(152,360		)	(400,614		)
Net cash used in financing activities	(328,571		)	(344,302		)	(868,955		)
Net increase in cash and cash equivalents	8,178			142,038			446,015
Cash and cash equivalents, beginning of period	653,833			511,795			65,780
Cash and cash equivalents, end of period	$	662,011		$	653,833		$	511,795

See accompanying notes to the consolidated financial statements.

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CONSOLIDATED STATEMENTS OF EQUITY

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Shares			Capital in Excess of Par Value		Retained Earnings			Accumulated Other Comprehensive Loss			Noncontrolling Interests			Total Equity
	Balance	Par Value
Balance at December 31, 2014	261,246	$	26,125	$	530,657	$	6,009,114		$	(69,418	)	$	722,304		$	7,218,782
Distributions to parent company, net	—	—		—		(376,714		)	—			—			(376,714		)
Capital contribution by parent - share-based compensation	—	—		30,652		—			—			—			30,652
Net income	—	—		—		534,811			—			72,201			607,012
Dividends paid to noncontrolling interests	—	—		—		—			—			(71,504		)	(71,504		)
Other comprehensive income, net	—	—		—		—			6,243			—			6,243
Balance at December 31, 2015	261,246	$	26,125	$	561,309	$	6,167,211		$	(63,175	)	$	723,001		$	7,414,471
Distributions to parent company, net	—	—		—		(152,360		)	—			—			(152,360		)
Capital contribution by parent - share-based compensation	—	—		32,782		—			—			—			32,782
Net income	—	—		—		(899,714		)	—			71,707			(828,007		)
Dividends paid to noncontrolling interests	—	—		—		—			—			(85,944		)	(85,944		)
Other comprehensive income, net	—	—		—		—			11,035			—			11,035
Balance at December 31, 2016	261,246	$	26,125	$	594,091	$	5,115,137		$	(52,140	)	$	708,764		$	6,391,977
Contributions from parent company, net	—	—		—		28,352			—			—			28,352
Share-based compensation contribution by parent	—	—		29,046		—			—			—			29,046
Net income (loss)	—	—		—		(474,316		)	—			22,584			(451,732		)
Dividends paid to noncontrolling interests	—	—		—		—			—			(56,881		)	(56,881		)
Other comprehensive income, net	—	—		—		—			9,252			—			9,252
Balance at December 31, 2017	261,246	$	26,125	$	623,137	$	4,669,173		$	(42,888	)	$	674,467		$	5,950,014

See accompanying notes to the consolidated financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Note 1— Organization and Significant Accounting Policies

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), is a leading offshore drilling contractor for the oil and gas industry. We provide contract drilling services with our global fleet of mobile offshore drilling units. As of December 31, 2017, our fleet consisted of eight drillships, six semisubmersibles and 14 jackups.

We report our contract drilling operations as a single reportable segment, Contract Drilling Services, which reflects how we manage our business. The mobile offshore drilling units comprising our offshore rig fleet operate in a global market for contract drilling services and are often redeployed to different regions due to changing demands of our customers, which consist primarily of large, integrated, independent and government-owned or controlled oil and gas companies throughout the world.

Noble Corporation, a Cayman Islands company (“Noble-Cayman”), is an indirect, wholly-owned subsidiary of Noble-UK, our publicly-traded parent company. Noble-UK’s principal asset is all of the shares of Noble-Cayman. Noble-Cayman has no public equity outstanding. The consolidated financial statements of Noble-UK include the accounts of Noble-Cayman, and Noble-UK conducts substantially all of its business through Noble-Cayman and its subsidiaries.

Principles of Consolidation

The consolidated financial statements include our accounts, those of our wholly-owned subsidiaries and entities in which we hold a controlling financial interest. Our consolidated financial statements also include the accounts of two joint ventures, in each of which we own a 50 percent interest. Our ownership interest meets the definition of variable interest under Financial Accounting Standards Board (“FASB”) codification and we have determined that we are the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.

The combined carrying amount of the Bully-class drillships at December 31, 2017 and 2016 totaled $1.3 billion and $1.4 billion, respectively. These assets were primarily funded through partner equity contributions. Cash held by the Bully joint ventures totaled approximately $41.6 million at December 31, 2017 as compared to approximately $34.7 million at December 31, 2016.

Prior Period Reclassification

We have made certain reclassifications to our prior period amounts in our operating revenue on our Consolidated Statements of Operations by combining our other revenue with reimbursables revenue to conform to the current period presentation. Such reclassification did not have a material effect on our results of operations and had no effect on our financial position or cash flows.

We have made certain reclassifications to our prior period amounts in our operating and investing sections on our Consolidated Statements of Cash Flows in accordance with ASU No. 2016-9, which amends ASC Topic 718, “Compensation— Stock Compensation.” See “— Accounting Pronouncements” below.

Foreign Currency Translation

Although we are a UK company, our functional currency is the U.S. dollar, and we define any non-U.S. dollar denominated currency as “foreign currencies”. In non-U.S. locations where the U.S. Dollar has been designated as the functional currency (based on an evaluation of factors including the markets in which the subsidiary operates, inflation, generation of cash flow, financing activities and intercompany arrangements), local currency transaction gains and losses are included in net income or loss. In non-U.S. locations where the local currency is the functional currency, assets and liabilities are translated at the rates of exchange on the balance sheet date, while statement of operations items are translated at average rates of exchange during the year. The resulting gains or losses arising from the translation of accounts from the functional currency to the U.S. Dollar are included in “Accumulated other comprehensive loss” in the Consolidated Balance Sheets. We did not recognize any material gains or losses on foreign currency transactions or translations during the three years ended December 31, 2017.

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, demand deposits with banks and all highly liquid investments with original maturities of three months or less. Our cash, cash equivalents and short-term investments are subject to potential credit risk, and certain of our cash accounts carry balances greater than the federally insured limits. Cash and cash equivalents are primarily held by major banks or investment firms. Our cash management and investment policies restrict investments to lower risk, highly liquid securities and we perform periodic evaluations of the relative credit standing of the financial institutions with which we conduct business.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Accounts Receivable

We record accounts receivable at the amount we invoice our clients, net of allowance for doubtful accounts. We provide an allowance for uncollectible accounts, as necessary. Our allowance for doubtful accounts as of December 31, 2017 and 2016 was $20.8 million, respectively.

Property and Equipment

Property and equipment is stated at cost, reduced by provisions to recognize economic impairment. Major replacements and improvements are capitalized. When assets are sold, retired or otherwise disposed of, the cost and related accumulated depreciation are eliminated from the accounts and the gain or loss is recognized. Drilling equipment and facilities are depreciated using the straight-line method over their estimated useful lives as of the date placed in service or date of major refurbishment. Estimated useful lives of our drilling equipment range from three to thirty years. Other property and equipment is depreciated using the straight-line method over useful lives ranging from two to forty years. Included in accounts payable were $21.0 million and $25.8 million of capital accruals as of December 31, 2017 and 2016, respectively.

Interest is capitalized on long-term construction project using the weighted average cost of debt outstanding during the period of construction.

Scheduled maintenance of equipment is performed based on the number of hours operated in accordance with our preventative maintenance program. Routine repair and maintenance costs are charged to expense as incurred; however, the costs of the overhauls and asset replacement projects that benefit future periods and which typically occur every three to five years are capitalized when incurred and depreciated over an equivalent period. These overhauls and asset replacement projects are included in “Drilling equipment and facilities” in “Note 5— Property and Equipment.”

We evaluate property and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. For more detailed information, see “Note 6— Impairment.”

Fair Value Measurements

We measure certain of our assets and liabilities based on a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The three-level hierarchy, from highest to lowest level of observable inputs, are as follows:

Level 1 - Valuations based on quoted prices in active markets for identical assets;

Level 2 - Valuations based on observable inputs that do not meet the criteria for Level 1, including quoted prices in inactive markets and quoted prices in active markets for similar but not identical instruments; and

Level 3 - Valuations based on unobservable inputs.

Revenue Recognition

Our typical dayrate drilling contract revenue, excluding taxes or duty, require our performance of a variety of services for a specified period of time. We determine progress towards completion of the contract by measuring efforts expended and the cost of services required to perform under a drilling contract, as the basis for our revenue recognition. Revenues generated from our dayrate-basis drilling contracts and labor contracts are recognized on a per day basis as services are performed and begin upon the contract commencement, as defined under the specified drilling contract. Dayrate revenues are typically earned, and contract drilling expenses are typically incurred ratably over the term of our drilling contracts. We review and monitor our performance under our drilling contracts to confirm the basis for our revenue recognition. Revenues from bonuses are recognized when earned, and when collectability is reasonably assured.

In our dayrate drilling contracts, we typically receive compensation and incur costs for mobilization, equipment modification or other activities prior to the commencement of a contract. Any such compensation may be paid through a lump-sum payment or other daily compensation. Pre-contract compensation and costs are deferred until the contract commences. The deferred pre-contract compensation and costs are amortized, using the straight-line method, into income or loss over the term of the initial contract period, regardless of the activity taking place. This approach is consistent with the economics for which the parties have contracted. Once a contract commences, we may conduct various activities, including drilling and well bore related activities, rig maintenance and equipment installation, movement between well locations or other activities.

Deferred revenues from drilling contracts totaled $114.3 million and $134.4 million at December 31, 2017 and 2016, respectively. Such amounts are included in either “Other current liabilities” or “Other liabilities” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition. Related expenses deferred under drilling contracts totaled $55.7 million at December 31, 2017 as compared to $72.8

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

million at December 31, 2016 and are included in either “Prepaid expenses and other current assets,” “Other assets” or “Property and equipment, net” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

In April 2015, we agreed to contract dayrate reductions for five rigs working for Saudi Aramco. Given current market conditions and based on discussions with the customer, we do not expect the rates for the rigs currently working for Saudi Aramco to return to the original contract rates during the remaining contract terms. In accordance with accounting guidance, we are recognizing the rate reductions on a straight-line basis over the remaining life of these Saudi Aramco contracts. At December 31, 2017 and 2016, two of the five original rigs had revenues recorded in excess of billings as a result of this recognition which totaled $6.9 million and $17.9 million, respectively, and are included in either “Prepaid expenses and other current assets” or “Other assets” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

We record reimbursements from customers for “out-of-pocket” expenses as revenues and the related direct cost as operating expenses.

Income Taxes

Income taxes are based on the laws and rates in effect in the countries in which operations are conducted or in which we or our subsidiaries are considered resident for income tax purposes. In certain circumstances, we expect that, due to changing demands of the offshore drilling markets and the ability to redeploy our offshore drilling units, certain of such units will not reside in a location long enough to give rise to future tax consequences. As a result, no deferred tax asset or liability has been recognized in these circumstances. Should our expectations change regarding the length of time an offshore drilling unit will be used in a given location, we will adjust deferred taxes accordingly.

Deferred tax assets and liabilities are recognized for the anticipated future tax effects of temporary differences between the financial statement basis and the tax basis of our assets and liabilities using the applicable jurisdictional tax rates at year-end. A valuation allowance for deferred tax assets is recorded when it is more likely than not that the deferred tax asset will not be realized in a future period.

We operate through various subsidiaries in numerous countries throughout the world, including the United States. Consequently, we are subject to changes in tax laws, treaties or regulations or the interpretation or enforcement thereof in the U.S., UK or jurisdictions in which we or any of our subsidiaries operate or are resident. Our income tax expense is based upon our interpretation of the tax laws in effect in various countries at the time that the expense was incurred. If the U.S. Internal Revenue Service (“IRS”) or other taxing authorities do not agree with our assessment of the effects of such laws, treaties and regulations, this could have a material adverse effect on us including the imposition of a higher effective tax rate on our worldwide earnings or a reclassification of the tax impact of our significant corporate restructuring transactions. The company has adopted an accounting policy to look through the outside basis of partnerships and all other flow-through entities and exclude these from the computation of deferred taxes.

On December 22, 2017, the President of the United States signed The Act into law. The Act represents major tax reform legislation that, among other provisions, reduces the U.S. corporate tax rate. The Company recognized the income tax effects of the Act in its 2017 financial statements, including $109.0 million of tax benefit recorded principally due to the write-down of our net deferred tax liabilities, in accordance with Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, in the reporting period in which the Act was enacted. Based on guidance issued from Staff Accounting Bulletin No. 118 ("SAB 118"), the Company has not provided provisional estimates for items in which the accounting for certain income tax effects of the Act is incomplete and as such, the Company will continue to apply ASC 740 on the basis of the laws in effect immediately before the enactment of the Act. See “Note 10— Income Taxes,” for further information on the financial statement impact of the Act.

The Act introduces a new anti-deferral provision, which subjects a U.S. parent shareholder to current tax on certain income referred to as Global Intangible Low-Taxed Income (“GILTI”), of its foreign subsidiaries. The company has not made any adjustments related to potential GILTI tax in its financial statements and has adopted a policy to treat tax due on future U.S. inclusions in taxable income as period costs when incurred.

Insurance Reserves

We maintain various levels of self-insured retention for certain losses including property damage, loss of hire, employment practices liability, employers’ liability and general liability, among others. We accrue for property damage and loss of hire charges on a per event basis.

Employment practices liability claims are accrued based on actual claims during the year. Maritime employer’s liability claims are generally estimated using actuarial determinations. General liability claims are estimated by our internal claims department by evaluating the facts and circumstances of each claim (including incurred but not reported claims) and making estimates based upon historical experience with similar claims. At December 31, 2017 and 2016, loss reserves for personal injury and protection claims totaled $22.0 million and $22.1 million, respectively, and such amounts are included in “Other current liabilities” in the accompanying Consolidated Balance Sheets.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Earnings per Share

Our unvested share-based payment awards, which contain non-forfeitable rights to dividends, are participating securities and are included in the computation of earnings per share pursuant to the two-class method. The two-class method allocates undistributed earnings between common shares and participating securities. The diluted earnings per share calculation under the two-class method also includes the dilutive effect of potential shares issued in connection with stock options. The dilutive effect of stock options is determined using the treasury stock method.

Share-Based Compensation Plans

We record the grant date fair value of share-based compensation arrangements as compensation cost using a straight-line method over the service period. Share-based compensation is expensed or capitalized based on the nature of the employee’s activities.

Discontinued Operations

On August 1, 2014, Noble-UK completed the separation and spin-off of a majority of its standard specification offshore drilling business through a pro rata distribution of all of the ordinary shares of its wholly-owned subsidiary, Paragon Offshore, to the holders of Noble’s ordinary shares (the “Spin-off”). Paragon Offshore, which had been reflected as continuing operations in our consolidated financial statements prior to the Spin-off, meets the criteria for being reported as discontinued operations and has been reclassified as such in our results of operations.

Prior to the completion of the Spin-off, Noble-UK and Paragon Offshore entered into certain separation agreements to effect the separation and Spin-off of Paragon Offshore and govern the relationship between the parties after the Spin-off (the “Separation Agreements”), including the Master Service Agreement (the “MSA”), and the Tax Sharing Agreement (the “TSA”). During the year ended December 31, 2017, we recorded a non-cash loss of $1.5 million in “Net loss from discontinued operations, net of tax” on our Consolidated Statement of Operations from the effects of Paragon Offshore's rejection of the Separation Agreements. For additional information related to the Paragon Spin-off, refer to “Note 14— Commitments and Contingencies.”

Certain Significant Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Certain accounting policies involve judgments and uncertainties to such an extent that there is reasonable likelihood that materially different amounts could have been reported under different conditions, or if different assumptions had been used. We evaluate our estimates and assumptions on a regular basis. We base our estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates and assumptions used in preparation of our consolidated financial statements.

Accounting Pronouncements

Accounting Standards Adopted

In March 2016, the FASB issued ASU No. 2016-9, which amends ASC Topic 718, “Compensation – Stock Compensation.” This amendment simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. This standard is effective for interim and annual reporting periods beginning after December 31, 2016 and we adopted the standard as of January 1, 2017. Under the new provision, current period excess tax benefits related to stock compensation are now recognized in our Consolidated Statement of Operations in “Provision for income taxes,” rather than on our Consolidated Balance Sheet and Consolidated Statement of Cash Flows. This update has been applied on a prospective basis. Changes to our Consolidated Statement of Cash Flows related to the reclassification of prior period excess tax benefits and employee taxes paid for share-based payment arrangements have been implemented on a retrospective basis. In accordance with our adoption of this update, prior period excess tax benefits of approximately $5.5 million and $1.6 million, previously classified as a financing activity in “Employee stock transactions” in the Consolidated Statement of Cash Flows for the year ended December 31, 2016 and 2015, respectively, are now classified as an operating activity in “Net change in other assets and liabilities” on the accompanying Consolidated Statement of Cash Flows for the comparative periods. Additionally, prior period employee taxes paid for share-based payment arrangements of approximately $3.2 million and $4.1 million, previously classified as an operating activity in “Net change in other assets and liabilities” in the Consolidated Statement of Cash Flows for the year ended December 31, 2016 and 2015, respectively, are now classified as a financing activity in “Employee stock transactions” on the accompanying Consolidated Statement of Cash Flows for the comparative periods.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Recently Issued Accounting Standards

In May 2014, the FASB issued ASU No. 2014-9, which creates Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers,” and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, ASU No. 2014-9 supersedes the cost guidance in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts,” and creates new Subtopic 340-40, “Other Assets and Deferred Costs—Contracts with Customers.” In summary, the core principle of Topic 606 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The amendments in ASU No. 2014-9 are effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period, and early application is permitted for periods beginning after December 15, 2016. We have formed an implementation work team, completed training on ASC Topic 606 and are finishing a project to review relevant contracts. We have adopted the new standard effective January 1,2018under the modified retrospective approach.With respect to our revenue recognized, as of December 31, 2017, we have qualitatively assessed that the effect of adoption will have an impact to deferred revenues in either “Other current liabilities” or “Other liabilities”, to revenues recorded in excess of billings recorded in “Prepaid expenses and other current assets,” and the net impact recorded to “Retained earnings” on our accompanying Consolidated Balance Sheets. Quantitatively, we estimate that the effect of our retrospective adoption will be immaterial. Therefore, with respect to our modified retrospective adoption, we do not anticipate a change to our financial presentation on our Consolidated Balance Sheets as of December 31, 2017.

In February 2016, the FASB issued ASU No. 2016-2, which creates ASC Topic 842, “Leases.” This update increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. Our adoption, and the ultimate effect on our consolidated financial statements, will be based on an evaluation of the contract-specific facts and circumstances. We expect to adopt ASC 842 effective January 1, 2019. We expect to apply the modified retrospective approach to our adoption. Our adoption will have an impact on how our consolidated financial statements and related disclosures will be presented. With respect to leases whereby we are the lessee, we are currently expecting to recognize lease liabilities and offsetting “right of use” assets upon adoption. We are currently evaluating any other impacts ASC 842, including any newly issued guidance, will have on our consolidated financial statements and related disclosures. To facilitate that evaluation, we have completed training on the ASU, formed an implementation team and started the review and documentation of contracts.

In October 2016, the FASB issued ASU No. 2016-16 which amends ASC Topic 740, “Income Taxes.” The amendments in this update improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This standard is effective for interim and annual reporting periods beginning after December 15, 2017 and will be applied on a modified retrospective basis. As a result of the modified retrospective application, we will reduce “Other assets” in our Consolidated Balance Sheet with a cumulative adjustment to retained earnings of approximately $148.0 million as of January 1, 2018.

In February 2017, the FASB issued ASU No. 2017-6, which amends ASC Topic 960, “Defined Benefit Pension Plans,” ASC Topic 962, “Defined Contribution Pension Plans” and ASC Topic 965, “Health and Welfare Benefit Plans.” The amendments in this update clarify presentation requirements for an employee benefit plan’s interest in a master trust and require more detailed disclosures of the plan’s interest in the master trust. The amendments also eliminate a redundancy relating to 401(h) account disclosures. This standard is effective for fiscal years beginning after December 15, 2018, with early application permitted. We are evaluating what impact, if any, the adoption of this guidance will have on our financial condition, results of operations, cash flows or financial disclosures.

In February 2018, the FASB issued ASU No. 2018-2, which amends ASC Topic 220, “Income Statement—Reporting Comprehensive Income.” The amendments in this update allow for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Act. This standard is effective for interim and annual reporting periods beginning after December 15, 2018; however, we expect to early adopt ASC 220 effective January 1, 2018. The amendment should be applied on a retrospective basis to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Act is recognized. As a result of the retrospective application, we will reduce “Accumulated Other Comprehensive Income” with a cumulative adjustment to “Retained Earnings” of approximately $5.5 million as of January 1, 2018.

With the exception of the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our consolidated financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Note 2— Consolidated Joint Ventures

We maintain a 50 percent interest in two joint ventures, each with a subsidiary of Royal Dutch Shell plc (“Shell”), that own and operate the twoBully-class drillships. We have determined that we are the primary beneficiary of the joint ventures. Accordingly, we consolidate the entities in our consolidated financial statements after eliminating intercompany transactions. Shell’s equity interests are presented as noncontrolling interests on our Consolidated Balance Sheets.

During the years ended December 31, 2017, 2016 and 2015, the Bully joint ventures approved and paid dividends totaling $113.8 million, $171.9 million and $143.0 million, respectively. Of these amounts, 50 percent was paid to our joint venture partner.

The combined carrying amount of the Bully-class drillships at December 31, 2017 and 2016 totaled $1.3 billion and $1.4 billion, respectively. These assets were primarily funded through partner equity contributions. Cash held by the Bully joint ventures totaled approximately $41.6 million at December 31, 2017 as compared to approximately $34.7 million at December 31, 2016.

Note 3— Earnings Per Share

The following table presents the computation of basic and diluted earnings per share for Noble-UK:

	Year Ended December 31,
	2017			2016			2015
Numerator:
Basic
Net income (loss) attributable to Noble-UK	$	(516,511	)	$	(929,580	)	$	511,000
Net income (loss) from discontinued operations, net of tax	1,486			—			—
Earnings allocated to unvested share-based payment awards	—			—			(10,856		)
Net income (loss) from continuing operations to common shareholders - basic	$	(515,025	)	$	(929,580	)	$	500,144
Diluted
Net income (loss) attributable to Noble-UK	$	(516,511	)	$	(929,580	)	$	511,000
Net income (loss) from discontinued operations, net of tax	1,486			—			—
Net income (loss) from continuing operations to common shareholders - diluted	$	(515,025	)	$	(929,580	)	$	511,000
Denominator:
Weighted average shares outstanding - basic	244,743			243,127			242,146
Incremental shares issuable from assumed exercise of stock options and unvested share-based payment awards	—			—			5,256
Weighted average shares outstanding - diluted	244,743			243,127			247,402
Earnings per share
Basic:
Income (loss) from continuing operations	$	(2.10	)	$	(3.82	)	$	2.06
Income (loss) from discontinued operations	(0.01		)	—			—
Net income (loss) attributable to Noble-UK	$	(2.11	)	$	(3.82	)	$	2.06
Diluted:
Income (loss) from continuing operations	$	(2.10	)	$	(3.82	)	$	2.06
Income (loss) from discontinued operations	(0.01		)	—			—
Net income (loss) attributable to Noble-UK	$	(2.11	)	$	(3.82	)	$	2.06
Dividends per share	$	—		$	0.20		$	1.28

Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. For the years ended December 31, 2017 and 2016, 12.0 million and 9.9 million share-based awards, respectively, were excluded from the diluted earnings per share since the effect would have been anti-dilutive. For the year ended December 31, 2015, approximately 1.7 million underlying stock options were excluded from the diluted earnings per share as such stock options were anti-dilutive.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Note 4— Receivables from Customers

At December 31, 2016, we had receivables of approximately $14.4 million related to the Noble Max Smith, which had been disputed by our former customer, Petróleos Mexicanos (“Pemex”) and were classified as long-term and included in “Other assets” on our Consolidated Balance Sheet. The receivables were related to lost revenues for downtime that occurred after our rig was damaged when one of Pemex's supply boats collided with our rig in 2010. A Mexican subsidiary of Paragon Offshore, which had operated the Noble Max Smith, had been prosecuting the claim against Pemex. During the year ended December 31, 2017, Paragon Offshore has announced that, as part of its bankruptcy plan, it will liquidate the Mexican entity involved.

While Noble owns all rights to amounts from that claim and will take available actions to recover such amounts, we believe the announced actions by Paragon Offshore create uncertainty relating to the prosecution of the claim and associated recovery, and accordingly, the disputed amounts of approximately $14.4 million were written off through “Contract drilling services” costs on the accompanying Consolidated Statements of Operations during the year ended December 31, 2017.

Note 5— Property and Equipment

Property and equipment, at cost, for Noble-UK consisted of the following:

	Year Ended December 31,
	2017		2016
Drilling equipment and facilities	$	11,746,629	$	12,048,571
Construction in progress	83,509		112,103
Other	204,193		204,214
Property and equipment, at cost	$	12,034,331	$	12,364,888

Capital expenditures, including capitalized interest, totaled $111.1 million, $659.9 million and $422.5 million for the years ended December 31, 2017, 2016 and 2015, respectively. During the year ended December 31, 2017, there was no capitalized interest due to the completion of our newbuild program. Capitalized interest was $22.4 million and$25.0 million for the years ended December 31, 2016 and 2015, respectively.

We took delivery of our final newbuild project, the heavy-duty, harsh environment jackup, the Noble Lloyd Noble, in July 2016, which commenced operations in November 2016 under a four-year contract in the North Sea. The Noble Sam Hartley commenced operations in January 2016.

During the year ended December 31, 2017, we recognized a $14.3 million charge in “Contract drilling services” costs related to damages sustained on the Noble Danny Adkins and Noble Jim Day during Hurricane Harvey in the U.S. Gulf of Mexico region.

During the years ended December 31, 2017, 2016, and 2015 we recognized a non-cash loss on impairment of $121.6 million, $1.5 billion and $418.3 million, respectively, related to our long-lived assets. See “Note 6— Impairment” for additional information.

Note 6— Impairment

In connection with the preparation of the consolidated financial statements included in this Annual Report, consistent with our accounting policies discussed in “Note 1— Organization and Significant Accounting Policies,” we evaluate our property and equipment for impairment whenever there are circumstances that suggest the value of an asset may not be recoverable.

An impairment loss on our property and equipment may exist when the estimated undiscounted cash flows expected to result from the use of the asset and its eventual disposition are less than its carrying amount. An impairment loss may be recognized when the excess of the asset's carrying value exceeds the estimated fair value. We estimate the fair value by applying the income valuation approach utilizing significant unobservable inputs, representative of a Level 3 fair value measurement. Assumptions used in our assessment included, but were not limited to, timing of future contract awards and expected operating day rates, operating costs, utilization rates, capital expenditures, reactivation costs and estimated economic useful lives. In addition, if we believe that one of our drilling units is no longer marketable or is otherwise unlikely to return to active service, we may elect to retire the unit and/or sell the unit at a value that may be substantially below its book value, and recognize an impairment charge that reduces the asset’s carrying value to the estimated fair value.

During the years ended December 31, 2017, 2016, and 2015, we recognized a non-cash loss on impairment of $121.6 million, $1.5 billion and $418.3 million, respectively, related to certain rigs and related capital spares.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

During the year ended December 31, 2017, we identified indicators that certain assets in our fleet might not be recoverable. Such indicators included additional customer suspensions of drilling programs, contract cancellations, a further reduction in the number of new contract opportunities, resulting in reduced drilling contracts, and our belief that a drilling unit is no longer marketable and is unlikely to return to service. As a result, we determined that the carrying amounts of the Noble Amos Runner, Noble Alan Hay, NobleDavid Tinsley and certain capital spares were impaired and recorded an impairment charge of approximately $121.6 million.

During the year ended December 31, 2016, in connection with our impairment analysis, we impaired the carrying values to estimated fair values for the Noble Amos Runner, Noble Clyde Boudreaux and Noble Dave Beard and recorded a charge of $1.0 billion related to these units. In addition, we concluded that the semisubmersible, the Noble Homer Ferrington, and certain capital spare equipment would not be utilized in the foreseeable future, and we recognized impairment charges of approximately $120.1 million and $170.5 million, respectively. Further, we decided to retire our semisubmersible, Noble Max Smith, which was sold for $1.2 million after we recognized an impairment charge during the year of approximately $164.8 million.

During the year ended December 31, 2015, we decided that we would no longer market one of our drillships, the Noble Discoverer. The decision was a result of the termination of the contract for this rig by Shell in December 2015 and the decreased opportunities for rigs of this type in the current marketplace. We also reviewed assumptions on the future marketability of one of our jackups, the Noble Charles Copeland, after its contract completion in late September 2015, with consideration given to its years in service, limited technical features and anticipated capital requirements in light of the current market conditions, and we decided to discontinue marketing this unit. Additionally, based upon an analysis of capital spare equipment, we elected to retire certain capital spare equipment. Accordingly, we recorded an impairment charge of $406.0 million for the year ended December 31, 2015 for these rigs and certain capital spares.

Note 7— Debt

Credit Facilities and Commercial Paper Program

2015 Credit Facility

At December 31, 2017, we had a five-year $2.4 billion senior unsecured credit facility that matures in January 2020 and which is guaranteed by our indirect, wholly owned subsidiaries, Noble Holding (U.S.) LLC (“NHUS”) and Noble Holding International Limited (“NHIL”) (the “2015 Credit Facility”). The 2015 Credit Facility also provided us with the ability to issue up to $500.0 million in letters of credit. The issuance of letters of credit under the facility reduces the amount available for borrowing. At December 31, 2017, we had no borrowings outstanding or letters of credit issued under our 2015 Credit Facility.

On December 19, 2017, we entered into the First Amendment and Consent and Successor Agent Agreement, (the “Amendment”) amending the 2015 Credit Facility. Upon certain conditions, including the entering into of the Company's 2017 Credit Facility (as defined below), the Amendment provides for, on or after January 3, 2018, among other things (i) a reduction in the aggregate principal amount of commitments under the 2015 Credit Facility to $300.0 million and (ii) the reduction of the 2015 Credit Facility's letter of credit subfacility to zero dollars. The maturity of the 2015 Credit Facility remains January 2020.

2017 Credit Facility

On December 21, 2017, Noble Cayman Limited, a Cayman Islands company and a wholly-owned indirect subsidiary of Noble-Cayman (“NCL”); Noble International Finance Company (“NIFCO”); and Noble Holding UK Limited, a company incorporated under the laws of England and Wales and a wholly-owned direct subsidiary of Noble-UK (“NHUK”), as parent guarantor, entered into a new senior unsecured credit agreement (the “2017 Credit Facility” and together with the 2015 Credit Facility, the “Credit Facilities”). The maximum aggregate amount of borrowings under the 2017 Credit Facility of $1.5 billion became available on January 3, 2018 upon the effectiveness of the commitment reduction under the 2015 Credit Facility. Borrowings under the 2017 Credit Facility are subject to certain conditions precedent, including that there be no unused commitments to advance loans under the 2015 Credit Facility. The 2017 Credit Facility provides for a letter of credit subfacility currently in the amount of $15.0 million, with the ability to increase such amount up to $500.0 million. Borrowings may be used for working capital and other general corporate purposes. The 2017 Credit Facility has an initial maturity of up to five years from the date on which the borrowings became available, or January 3, 2023. At December 31, 2017, we had no borrowings outstanding or letters of credit issued under the 2017 Credit Facility.

Both of our Credit Facilities have provisions which vary the applicable interest rates for borrowings based upon our debt ratings. We also pay a facility fee under each of the Credit Facilities on the daily unused amount of the underlying commitment which varies depending on our credit ratings. At December 31, 2017, the interest rates in effect under our Credit Facilities are the highest permitted interest rates under those agreements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Debt Issuances

In December 2016, we issued $1.0 billion aggregate principal amount of the 2024 Notes, which we issued through our indirect wholly-owned subsidiary, NHIL. The net proceeds of approximately $967.6 million, after estimated expenses, were primarily used to retire a portion of our near-term senior notes in a related tender offer and the remaining portion was used for general corporate purposes. In January 2018, we issued and sold $750.0 million aggregate principal amount of our Senior Notes due 2026, which is described further in “Note 19— Subsequent Events.”

Senior Notes Interest Rate Adjustments

During 2017 and 2016, we experienced debt rating downgrades by Moody’s Investors Service and S&P Global Ratings, which reduced our debt ratings significantly below investment grade. As a result of these downgrades, we experienced interest rate increases during 2017 and 2016 on the 2018 Notes, 2025 Notes and 2045 Notes, all of which are subject to provisions that vary the applicable interest rates based on our debt rating. On October 18, 2017 S&P Global Ratings further reduced our debt rating, which will increase the interest rates on the 2025 Notes and 2045 Notes to 7.95% and 8.95%, respectively, beginning in April 2018. Once the new interest rates take effect in April 2018, these senior notes will have reached the contractually-defined maximum interest rate set for each rating agency and no further interest rate increase will occur.

Our other outstanding senior notes, including the 2024 Notes issued in December 2016, and 2026 Notes issued in January 2018, do not contain provisions varying applicable interest rates based upon our credit ratings.

Debt Tender Offers and Repayments

In March 2017, we repaid our 2017 Notes using cash on hand. We anticipate using cash on hand to repay the outstanding balance of our $300 million 2018 Notes, maturing in March 2018. In February 2018, we completed an optional redemption of our remaining 2019 Notes, which is described further in “Note 19— Subsequent Events.”

In December 2016, we commenced cash tender offers for our 2020 Notes, 2021 Notes and 2022 Notes. On December 28, 2016, we purchased $762.3 million of these Senior Notes for $750.0 million, plus accrued interest, using a portion of the net proceeds of the $1.0 billion2024 Notes issuance in December 2016. In December 2016, as a result of these tender offers, we recognized a net gain of approximately $6.7 million.

In March 2016, we commenced cash tender offers for our 2020 Notes and our 2021 Notes. On April 1, 2016, we purchased $36.0 million of these Senior Notes for $24.0 million, plus accrued interest, using cash on hand. In April 2016, as a result of these tender offers, we recognized a net gain of approximately $11.1 million.

Covenants

The 2015 Credit Facility is guaranteed by NHUS and NHIL. The 2015 Credit Facility contains a covenant that limits our ratio of debt to total tangible capitalization, as defined in the 2015 Credit Facility, to 0.60. At December 31, 2017, our ratio of debt to tangible capitalization was approximately 0.43. We were in compliance with all covenants under the 2015 Credit Facility as of December 31, 2017.

The 2017 Credit Facility contains certain financial covenants (as defined in the 2017 Credit Facility) applicable to NHUK and its subsidiaries, including (i) a covenant restricting debt to total tangible capitalization to not greater than 55% at the end of each fiscal quarter, (ii) a minimum Liquidity requirement of $300.0 million, (iii) a covenant that, beginning with the fiscal quarter ending March 31, 2018, the ratio of the Rig Value of Marketed Rigs to the sum of commitments under the 2017 Credit Facility plus indebtedness for borrowed money of the borrowers and guarantors, in each case, that directly own Marketed Rigs, is not less than 3:00 to 1:00 at the end of each fiscal quarter and (iv) a covenant that, beginning with the fiscal quarter ending March 31, 2018, the ratio of (A) the Rig Value of the Closing Date Rigs that are directly wholly owned by the borrowers and guarantors to (B) the Rig Value of the Closing Date Rigs owned by NHUK, subsidiaries of NHUK and certain local content affiliates, is not less than 80% at the end of each fiscal quarter (such covenants described in (iii) and (iv) of this paragraph, the “Guarantor Ratio Covenants”). The 2017 Credit Facility also includes restrictions on borrowings if, after giving effect to any such borrowings and the application of the proceeds thereof, the aggregate amount of Available Cash (as defined in the 2017 Credit Facility) would exceed $200.0 million.

NHUK has guaranteed the obligations of the borrowers under the 2017 Credit Facility. Certain other subsidiaries of Noble-UK will be required from time to time to guarantee the obligations of the borrowers under the 2017 Credit Facility in order maintain compliance with the Guarantor Ratio Covenants.

The 2017 Credit Facility contains additional covenants generally applicable to NHUK and its subsidiaries that NCL considers usual and customary for an agreement of this type, including compliance with laws (including environmental laws, ERISA and anti-corruption and sanctions laws), delivery of quarterly and annual financial statements, maintenance and operation of property, restrictions on the incurrence of liens and indebtedness, mergers and other fundamental changes, restricted payments, repurchases and redemptions of indebtedness with maturities outside of the maturity of the 2017 Credit Facility, sale and leaseback transactions and transactions with affiliates. Borrowings under the 2017 Credit Facility are subject to acceleration upon the occurrence of events of default that NCL considers usual and customary for an agreement of this type.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

In addition to the covenants from the Credit Facilities noted above, the indentures governing our outstanding senior unsecured notes contain covenants that place restrictions on certain merger and consolidation transactions, unless we are the surviving entity or the other party assumes the obligations under the indenture, and on the ability to sell or transfer all or substantially all of our assets. In addition, there are restrictions on incurring debt or assuming certain liens and on entering into sale and lease-back transactions. The indenture for the 2026 Notes that we issued in January 2018 places more limitations on us and our subsidiaries than our other senior note indentures. See “—Debt Issuances” above.

At December 31, 2017, we were in compliance with all of the debt covenants under our Credit Facilities and senior notes. We continually monitor compliance with the covenants under our Credit Facilities and senior notes and expect to remain in compliance throughout 2018.

Five-year debt obligations

At December 31, 2017, aggregate principal repayments of total debt for the next five years and thereafter are as follows:

2018		2019		2020		2021		2022		Thereafter		Total
$	250,000	$	201,695	$	167,766	$	208,675	$	125,661	$	3,150,000	$	4,103,797

Carrying value and estimated fair values

Fair value represents the amount at which an instrument could be exchanged in a current transaction between willing parties. The estimated fair value of our senior notes was based on the quoted market prices for similar issues or on the current rates offered to us for debt of similar remaining maturities (Level 2 measurement). All remaining fair value disclosures are presented in “Note 13— Fair Value of Financial Instruments.”

The following table presents the carrying value and the estimated fair value of our total debt, not including the effect of unamortized debt issuance costs, respectively:

	December 31, 2017						December 31, 2016
	Carrying Value			Estimated Fair Value			Carrying Value			Estimated Fair Value
Senior unsecured notes
2.50% Senior Notes due March 2017	$	—		$	—		$	299,992		$	299,128
5.75% Senior Notes due March 2018	249,959			250,830			249,771			249,808
7.50% Senior Notes due March 2019	201,695			206,881			201,695			209,524
4.90% Senior Notes due August 2020	167,625			163,283			167,576			167,329
4.625% Senior Notes due March 2021	208,568			195,687			208,538			196,416
3.95% Senior Notes due March 2022	125,518			107,348			125,488			112,791
7.75% Senior Notes due January 2024	982,301			861,160			980,117			945,317
7.70% Senior Notes due April 2025	449,008			380,732			448,909			423,267
6.20% Senior Notes due August 2040	399,900			274,988			399,898			280,221
6.05% Senior Notes due March 2041	397,800			273,988			397,758			273,854
5.25% Senior Notes due March 2042	498,400			315,430			498,369			325,814
8.70% Senior Notes due April 2045	394,659			320,396			394,613			328,608
Total debt	4,075,433			3,350,723			4,372,724			3,812,077
Less: Unamortized debt issuance costs	(29,723		)				(32,613		)
Less: Current maturities of long-term debt (1)	(249,843		)	(250,830		)	(299,882		)	(299,128		)
Long-term debt, net of debt issuance costs	$	3,795,867		$	3,099,893		$	4,040,229		$	3,512,949

⁽¹⁾  Presented net of current portion of unamortized debt issuance costs of $0.1 million and $0.1 million at December 31, 2017 and 2016, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Note 8— Equity

Share Capital

As of December 31, 2017 Noble-UK had approximately 245.0 million shares outstanding and trading as compared to approximately 243.2 million shares outstanding and trading at December 31, 2016. Repurchased shares are recorded at cost, and include shares repurchased pursuant to our approved share repurchase program discussed below. Our Board of Directors may increase our share capital through the issuance of up to 53 million authorized shares (at current nominal value of $0.01 per share) without obtaining shareholder approval.

The declaration and payment of dividends require the authorization of the Board of Directors of Noble-UK, provided that such dividends on issued share capital may be paid only out of Noble-UK’s “distributable reserves” on its statutory balance sheet in accordance with UK laws. Therefore, Noble-UK is not permitted to pay dividends out of share capital, which includes share premiums. The resumption of the payment of future dividends will depend on our results of operations, financial condition, cash requirements, future business prospects, contractual restrictions and other factors deemed relevant by our Board of Directors.

Share Repurchases

The Company is only permitted to purchase its own shares by way of an “off-market purchase” in a plan approved by shareholders. In December 2014, we received shareholder approval to repurchase up to 37 million ordinary shares, or approximately 15 percent of our outstanding ordinary shares at the time of the shareholder approval. The authority to make such repurchases expired at the end of the Company’s 2016 annual general meeting of shareholders, which was held on April 22, 2016. During 2015, we repurchased 6.2 million of our ordinary shares covered by this authorization at an average price of $16.10 per share, excluding commissions and stamp tax, for a total cost of approximately $100.6 million. All shares repurchased were made in the open market pursuant to the share repurchase program discussed above, and all shares repurchased were immediately canceled. During the years ended December 31, 2017 and 2016, we did not repurchase any of our shares.

Share-Based Compensation Plans

Stock Plans

During 2015, Noble Corporation plc shareholders approved a new equity plan, the Noble Corporation 2015 Omnibus Incentive Plan (the “2015 Incentive Plan”), which permits grants of options, stock appreciation rights (“SARs”), stock or stock unit awards or cash awards, any of which may be structured as a performance award, from time to time to employees who are to be granted awards under the 2015 Incentive Plan. Neither consultants nor non-employee directors are eligible for awards under the 2015 Incentive Plan.

During 2017 and 2016, the 2015 Incentive Plan was restated and shareholders approved amendments, primarily to increase the number of ordinary shares available for issuance as long-term incentive compensation under the 2015 Incentive Plan by 3.7 million and 9.5 million shares, respectively. The maximum aggregate number of ordinary shares that may be granted for any and all awards under the 2015 Incentive Plan will not exceed 20.5 million shares and at December 31, 2017, we had 10.4 million shares remaining available for grants to employees.

The Noble Corporation 1991 Stock Option and Restricted Stock Plan, as amended (the “1991 Plan”), provides for the granting of options to purchase our shares, with or without stock appreciation rights, and the awarding of restricted shares or units to selected employees. Upon shareholder approval of the 2015 Incentive Plan, as described above, the 1991 Plan was terminated and equity based awards to employees are now made only through the 2015 Incentive Plan. Equity based awards previously granted under the 1991 Plan remain outstanding in accordance with their terms, which include the 1991 Plan.

Prior to 2017, we used the Noble Corporation 1992 Nonqualified Stock Options and Share Plan for Non-Employee Directors (the “1992 Plan”), to issue stock awards to non-employee directors. During 2017, upon shareholder approval, the Noble Corporation plc 2017 Director Omnibus Plan (the “Director Plan”) replaced the 1992 Plan. At the same time, the 1992 Plan was terminated and equity based awards to non-employee directors are now made only through the Director Plan.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Stock Options

Options have a term of 10 years, an exercise price equal to the fair market value of a share on the date of grant and generally vest over a three-year period. A summary of the status of stock options granted under both the 1991 Plan and 1992 Plan as of December 31, 2017, 2016 and 2015 and the changes during the year ended on those dates is presented below:

	2017				2016				2015
	Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options		Weighted Average Exercise Price
Outstanding at beginning of year	1,420,175		$	29.52	1,677,154		$	29.48	1,958,633		$	28.43
Expired	(107,020	)	29.74		(256,979	)	29.22		(281,479	)	22.17
Outstanding at end of year (1)	1,313,155		29.51		1,420,175		29.52		1,677,154		29.48
Exercisable at end of year (1)	1,313,155		$	29.51	1,420,175		$	29.52	1,677,154		$	29.48

⁽¹⁾  Options outstanding and exercisable at December 31, 2017 had no intrinsic value.

The following table summarizes additional information about stock options outstanding at December 31, 2017:

	Options Outstanding and Exercisable
	Number of Shares Underlying Options	Weighted Average Remaining Life (Years)	Weighted Average Exercise Price
$20.49 to $26.18	302,854	2.67	$	21.37
$26.19 to $31.51	360,936	5.10	30.59
$31.52 to $35.73	649,365	3.16	32.70
Total	1,313,155	3.58	$	29.51

The fair value of each option is estimated on the date of grant using a Black-Scholes pricing model. The expected term of options granted represents the period of time that the options are expected to be outstanding and is derived from historical exercise behavior, current trends and values derived from lattice-based models. Expected volatilities are based on implied volatilities of traded options on our shares, historical volatility of our shares, and other factors. The expected dividend yield is based on historical yields on the date of grant. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant.

There were no non-vested stock option balances at December 31, 2017 or any changes during the year ended December 31, 2017. No new stock options were granted during the years ended December 31, 2017, 2016 and 2015.

There was no compensation cost recognized during the years ended December 31, 2017 and 2016, respectively, related to stock options. Compensation cost recognized during the year ended December 31, 2015 related to stock options totaled $0.1 million.

Restricted Stock Units (“RSUs”)

We have awarded both TVRSUs and PVRSUs under the 1991 Plan and the 2015 Incentive Plan. The TVRSUs generally vest over a three-year period. The number of PVRSUs which vest will depend on the degree of achievement of specified corporate performance criteria over a three-year performance period. These criteria are strictly market-based criteria as defined by FASB standards.

The TVRSUs are valued on the date of award at our underlying share price. The total compensation for units that ultimately vest is recognized over the service period. The shares and related nominal value are recorded when the restricted stock unit vests and additional paid-in capital is adjusted as the share-based compensation cost is recognized for financial reporting purposes.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

The market-based PVRSUs are valued on the date of grant based on the estimated fair value. Estimated fair value is determined based on numerous assumptions, including an estimate of the likelihood that our stock price performance will achieve the targeted thresholds and the expected forfeiture rate. The fair value is calculated using a Monte Carlo Simulation Model. The assumptions used to value the PVRSUs include historical volatility and risk-free interest rates over a time period commensurate with the remaining term prior to vesting, as follows:

	2017		2016		2015
Valuation assumptions:
Expected volatility	56.4	%	40.7	%	34.0	%
Expected dividend yield	—	%	—	%	9.4	%
Risk-free interest rate	1.49	%	0.97	%	0.8	%

Additionally, similar assumptions were made for each of the companies included in the defined index and the peer group of companies in order to simulate the future outcome using the Monte Carlo Simulation Model.

A summary of the RSUs awarded for each of the years ended December 31, 2017, 2016 and 2015 is as follows:

	2017		2016		2015
TVRSU
Units awarded (maximum available)	3,231,225		3,624,182		2,004,311
Weighted-average share price at award date	$	6.96	$	7.78	$	15.90
Weighted-average vesting period (years)	3.0		3.0		3.0
PVRSU
Units awarded (maximum available)	2,474,978		2,914,044		1,205,130
Weighted-average share price at award date	$	7.28	$	7.79	$	15.94
Three-year performance period ended December 31	2019		2018		2017
Weighted-average award-date fair value	$	4.37	$	3.81	$	9.12

During the years ended December 31, 2017, 2016 and 2015, we awarded 212,849, 227,937 and 99,063 shares, respectively, to our employees. During the year ended December 31, 2017, we awarded 197,316 shares to our non-employee directors.

A summary of the status of non-vested RSUs at December 31, 2017 and changes during the year ended December 31, 2017 is presented below:

	TVRSUs Outstanding		Weighted Average Award-Date Fair Value		PVRSUs Outstanding (1)		Weighted Average Award-Date Fair Value
Non-vested RSUs at January 1, 2017	4,089,167		$	11.18	4,378,825		$	7.85
Awarded	3,231,225		6.96		2,474,978		4.37
Vested	(1,768,175	)	47.20		(367,794	)	65.56
Forfeited	(508,715	)	8.41		(840,555	)	10.67
Non-vested RSUs at December 31, 2017	5,043,502		$	7.95	5,645,454		$	4.98

(1)The number of PVRSUs shown equals the units that would vest if the “maximum” level of performance is achieved. The minimum number of units is zero and the “target” level of performance is 50 percent of the amounts shown.

At December 31, 2017, there was $21.5 million of total unrecognized compensation cost related to the TVRSUs, which is expected to be recognized over a remaining weighted-average period of 1.6 years. The total award-date fair value of TVRSUs vested during the year ended December 31, 2017 was $23.8 million.

At December 31, 2017, there was $9.8 million of total unrecognized compensation cost related to the PVRSUs, which is expected to be recognized over a remaining weighted-average period of 1.5 years. The total potential compensation for PVRSUs is recognized over the service period regardless of whether the performance thresholds are ultimately achieved. In February 2018, 603,440 PVRSUs for the 2015-2017 performance period were forfeited.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Share-based amortization recognized during the years ended December 31, 2017, 2016 and 2015 related to all restricted stock totaled $29.1 million ($26.3 million net of income tax), $34.7 million ($31.0 million net of income tax) and $39.0 million ($31.0 million net of income tax), respectively. During the year ended December 31, 2017, capitalized share-based amortization was zero. During the years ended December 31, 2016 and 2015, capitalized share-based amortization totaled approximately $0.2 million and $1.0 million, respectively.

Note 9— Accumulated Other Comprehensive Income (Loss)

The following table presents the changes in the accumulated balances for each component of AOCI for the years ended December 31, 2017 and 2016. All amounts within the tables are shown net of tax.

	Unrealized Gains /(Losses) on Cash Flow Hedges (1)			Defined Benefit Pension Items (2)			Foreign Currency Items			Total
Balance at December 31, 2015	$	—		$	(46,919	)	$	(16,256	)	$	(63,175	)
Activity during period:
Other comprehensive income (loss) before reclassifications	1,187			(8,237		)	(19		)	(7,069		)
Amounts reclassified from AOCI	(1,187		)	19,291			—			18,104
Net other comprehensive income (loss)	—			11,054			(19		)	11,035
Balance at December 31, 2016	$	—		$	(35,865	)	$	(16,275	)	$	(52,140	)
Activity during period:
Other comprehensive income before reclassifications	1,239			6,630			990			8,859
Amounts reclassified from AOCI	(1,239		)	1,632			—			393
Net other comprehensive income	—			8,262			990			9,252
Balance at December 31, 2017	$	—		$	(27,603	)	$	(15,285	)	$	(42,888	)

⁽¹⁾  Unrealized gains/(losses) on cash flow hedges are related to foreign currency forward contracts. Reclassifications from AOCI are recognized through “Contract drilling services” costs on our Consolidated Statements of Operations. See “Note 12— Derivative Instruments and Hedging Activities” for additional information.

⁽²⁾  Defined benefit pension items relate to actuarial changes and the amortization of prior service costs. Reclassifications from AOCI are recognized as expense on our Consolidated Statements of Operations through either “Contract drilling services” or “General and administrative.” “See Note 11— Employee Benefit Plans ” for additional information.

Note 10— Income Taxes

Noble-UK is a company which is a tax resident in the UK and, as such, will be subject to UK corporation tax on its taxable profits and gains. A UK tax exemption is available in respect of qualifying dividends income and capital gains related to the sale of qualifying participations. We operate in various countries throughout the world, including the United States. The income or loss of the non-UK subsidiaries is not expected to be subject to UK corporation tax. Prior to the redomiciliation, Noble-Swiss was the group holding company and was exempt from Swiss cantonal and communal income tax on its worldwide income or loss, and was also granted participation relief from Swiss federal tax for qualifying dividend income and capital gains related to the sale of qualifying participations. It is expected that the participation relief will result in a full exemption of participation income from Swiss federal income tax. We do not expect the redomiciliation from Switzerland to the UK to have a material impact on our effective tax rate.

Consequently, we have taken account of those tax exemptions and provided for income taxes based on the laws and rates in effect in the countries in which operations are conducted, or in which we or our subsidiaries have a taxable presence for income tax purposes.

On December 22, 2017, the President of the United States signed The Act into law. The Act makes significant changes to various areas of U.S. federal income tax law by, among other things, lowering corporate income tax rates, implementing the territorial tax system, and rules limiting base erosion, and imposing a repatriation tax on deemed repatriated earnings of foreign subsidiaries of U.S parent shareholders.

The Company recognized the income tax effects of the Act in its 2017 financial statements in accordance with ASC Topic 740, Income Taxes, in the reporting period in which the Act was enacted. Based on guidance issued from SAB 118, the Company has not provided provisional estimates for items in which the accounting for certain income tax effects of the Act is incomplete and as such, the Company will continue to apply ASC 740 on the basis of the laws in effect immediately before the enactment of the Act.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

The changes to existing U.S. tax law as a result of the Act, which had an impact on the Company's federal income taxes for 2017, are as follows:

• The Act reduces the federal corporate income tax rate to 21% from 35% effective January 1, 2018. Accordingly, the Company recorded a financial statement benefit of $109.0 million as a result of the remeasurement of its net deferred tax liabilities during the quarter ended December 31, 2017.

• The Act provides for a Deemed Repatriation Transition Tax (the “Transition Tax”), which is a one-time tax on previously untaxed accumulated earnings and profits (“E&P”) of certain foreign subsidiaries. For the quarter ended December 31, 2017, no additional income taxes were provided for as the Company has estimated there to be no untaxed accumulated E&P.

• The Act provides for immediate an deduction of 100% of the costs of qualified property that is placed in service after September 27, 2017 and before January 1, 2023.The deduction will phase out by 20 percentage points each calendar year for qualified property that is placed in service after December 21, 2022. The company has estimated no material impact from this provision for the quarter ended December 31, 2017.

The estimates above are provisional amounts based on information available as of December 31, 2017. These amounts are subject to changes as we refine our estimates and our interpretation of the Act. Any adjustments to these provisional amounts will be included in the financial statements in the reporting period in which such adjustments are determined, which will be no later than the fourth quarter of 2018.

Other provisions of the Act, which are effective January 1, 2018 and could have an impact on the Company's financial results for 2018 and later periods are as follows:

• The Act limits the deduction of business interest to 30% of “adjusted taxable income”, which is taxable income computed without regard to (i) any items not attributable to a trade or business, (ii) business interest income and business interest expense, (iii) any net operating loss deduction, and (iv) for taxable years beginning before January 1, 2022, deductions for depreciation , amortization and depletion. This limitation could result in a deferral or permanent reduction in the amount of interest that is deductible for U.S. federal income tax purposes after 2017.

• The Act eliminates the U.S. federal income tax carryback provision for net operating losses (“NOLs”) generated after 2017 and limits the taxpayer's ability to utilize NOL carryforwards to 80% of taxable income. These changes could impact the company's valuation allowance assessment for NOLs generated after December 31, 2017.

• The Act includes an anti-base erosion provision which establishes a tax on certain payments made by U.S. corporate taxpayers to related foreign persons, also referred to as Base Erosion and Anti-Abuse Tax (“BEAT”). The company is continuing to gather additional information to determine the ultimate impact of BEAT.

• The Act introduces a new anti-deferral provision, which subjects a U.S. parent shareholder to current tax on certain income referred to as GILTI, of its foreign subsidiaries. The company has not made any adjustments related to potential GILTI tax in its financial statements and has adopted a policy to treat tax due on future U.S. inclusions in taxable income as period costs when incurred.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

The components of the net deferred taxes are as follows:

	2017			2016
Deferred tax assets
United States
Excess of net tax basis over remaining book basis	$	—		$	56,351
Deferred pension plan amounts	10,758			16,797
Accrued expenses not currently deductible	11,585			19,012
Other	2,150			6,803
Non-U.S.
Net operating loss carry forwards	—			3,800
Deferred pension plan amounts	134			3,120
Accrued expense not currently deductible	14,085			2,064
Deferred tax assets	38,712			107,947
Less: valuation allowance	—			(3,800		)
Net deferred tax assets	$	38,712		$	104,147
Deferred tax liabilities
United States
Excess of net book basis over remaining tax basis	$	(182,401	)	$	—
Other	(6,652		)	(7,672		)
Non-U.S.
Excess of net book basis over remaining tax basis	—			(200		)
Other	(402		)	(4,305		)
Deferred tax liabilities	(189,455		)	(12,177		)
Net deferred tax assets (liabilities)	$	(150,743	)	$	91,970

Income (loss) from continuing operations before income taxes consists of the following:

	Year Ended December 31,
	2017			2016			2015
United States	$	(81,329	)	$	(428,087	)	$	4,031
Non-U.S.	(368,485		)	(538,942		)	738,402
Total	$	(449,814	)	$	(967,029	)	$	742,433

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

The income tax provision (benefit) for continuing operations consists of the following: 

	Year Ended December 31,
	2017			2016			2015
Current- United States	$	(227,707	)	$	61,928		$	113,648
Current- Non-U.S.	29,010			18,813			81,756
Deferred- United States	257,432			(189,880		)	(38,103		)
Deferred- Non-U.S.	(16,106		)	(17		)	1,931
Total	$	42,629		$	(109,156	)	$	159,232

The following is a reconciliation of our reserve for uncertain tax positions, excluding interest and penalties. In 2016, we released an uncertain tax position in Libya in the gross amount of $40 million coupled with a related tax benefit of $13 million.

	2017			2016			2015
Gross balance at January 1,	$	159,826		$	169,687		$	108,812
Additions based on tax positions related to current year	14,187			15,665			31,022
Additions for tax positions of prior years	1,284			18,662			47,561
Reductions for tax positions of prior years	(860		)	(43,701		)	(11,945		)
Expiration of statutes	—			(487		)	(1,237		)
Tax settlements	—			—			(4,526		)
Gross balance at December 31,	174,437			159,826			169,687
Related tax benefits	(1,008		)	(1,008		)	(14,369		)
Net reserve at December 31,	$	173,429		$	158,818		$	155,318

The liabilities related to our reserve for uncertain tax positions are comprised of the following:

	2017		2016
Reserve for uncertain tax positions, excluding interest and penalties	$	173,429	$	158,818
Interest and penalties included in “Other liabilities”	18,431		13,702
Reserve for uncertain tax positions, including interest and penalties	$	191,860	$	172,520

At December 31, 2017, the reserves for uncertain tax positions totaled $191.9 million (net of related tax benefits of 1.0 million). If the December 31, 2017 reserves are not realized, the provision for income taxes would be reduced by $186.6 million. At December 31, 2016, the reserves for uncertain tax positions totaled $172.5 million (net of related tax benefits of 1.0 million).

It is reasonably possible that our existing liabilities related to our reserve for uncertain tax positions may fluctuate in the next 12 months primarily due to the completion of open audits or the expiration of statutes of limitation. However, we cannot reasonably estimate a range of changes in our existing liabilities due to various uncertainties, such as the unresolved nature of various audits.

We include, as a component of our “Income tax provision,” potential interest and penalties related to recognized tax contingencies within our global operations. Interest and penalties resulted in an income tax expense of $4.7 million in 2017, an income tax expense of $2.7 million in 2016 and an income tax benefit of $2.9 million in 2015.

During the year ended December 31, 2017, our income tax provision included a non-cash, discrete item of $260.7 million as the result of an internal tax restructuring, which was implemented to reduce costs associated with the ownership of multiple legal entities, simplify the overall legal entity structure, ease deployment of cash throughout the business and consolidate operations into one centralized group of entities.

As of December 31, 2017, we recorded deferred charges of $145.3 million related to the deferral of income tax expense on intercompany asset transfers as a result of our internal tax restructuring. The deferred charges are included in “Other assets” on the accompanying Consolidated Balance Sheet and are amortized as a component of income tax expense over the remaining life of the underlying assets.

We conduct business globally and, as a result, we file numerous income tax returns in U.S. and in non-U.S. jurisdictions. In the normal course of business we are subject to examination by taxing authorities throughout the world, including in jurisdictions such as Brazil, Brunei, Bulgaria, Cyprus, Mexico, Norway, Saudi Arabia, Argentina, Australia, Denmark, Gabon, Luxembourg, Malaysia, the Netherlands, Tanzania,

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Singapore, Switzerland, the United Kingdom and the United States. We are no longer subject to U.S. Federal income tax examinations for years before 2010 and non-U.S. income tax examinations for years before 2000.

Noble-UK conducts substantially all of its business through Noble-Cayman and its subsidiaries. The income or loss of our non-UK subsidiaries is not subject to UK income tax. Earnings are taxable in the United Kingdom at the UK statutory rate of 19 percent. The ongoing consultative process in the United Kingdom and a possible change in law could materially impact our tax rate on operations in the United Kingdom continental shelf. A reconciliation of tax rates outside of the United Kingdom and the Cayman Islands to our Noble-UK effective rate for continuing operations is shown below:

	Year Ended December 31,
	2017		2016		2015
Effect of:
Tax rates which are different than the UK and Cayman Island rates	23.4	%	8.4	%	14.4	%
Tax impact of asset impairment	11.7	%	3.9	%	5.3	%
Tax impact of tax restructuring	(76.1	)%	—	%	—	%
Tax impact of tax reform	33.4	%	—	%	—	%
Reserve for (resolution of) tax authority audits	(1.9	)%	(1.0	)%	1.7	%
Total	(9.5	)%	11.3	%	21.4	%

We generated and fully utilized U.S. foreign tax credits of $15.0 million in 2015. Due to foreign tax credit limitation constraints, in 2017 and 2016, the Company has made the determination to take foreign tax expense as a deduction against U.S. taxable income.

At December 31, 2017, the company asserts that the investment in foreign subsidiaries is permanent in nature, and estimates that there are no net cumulative earnings in its foreign subsidiaries. At December 31, 2016, we had no undistributed earnings of our subsidiaries for which deferred income taxes have not been provided. 

Note 11— Employee Benefit Plans

Defined Benefit Plans

Noble maintains two pension plans for certain of our employees whose most recent date of employment is prior to April 1, 2014 operating in the North Sea, the Noble Drilling (Land Support) Limited (“NDLS”) and the Noble Resources Limited (“NRL”), both indirect, wholly-owned subsidiaries of Noble-UK. Reference to our “non-U.S. plans” included throughout this report relates to both the NDLS and NRL plans, as well as the activity for the two legacy plans for the periods prior to the Spin-off.

In addition to the non-U.S. plans discussed above, we have two U.S. noncontributory defined benefit pension plans: one which covers certain salaried employees and one which covers certain hourly employees, whose initial date of employment is prior to August 1, 2004 (collectively referred to as our “qualified U.S. plans”). These plans are governed by the Noble Drilling Employees’ Retirement Trust (the “Trust”). These plans qualify under the Employee Retirement Income Security Act of 1974 (“ERISA”), and our funding policy is consistent with funding requirements of ERISA and other applicable laws and regulations. We make cash contributions, or utilize credit balances available to us under the plan, for the qualified U.S. plans when required. The benefit amount that can be covered by the qualified U.S. plans is limited under ERISA and the Internal Revenue Code (“IRC”) of 1986. Therefore, we maintain an unfunded, nonqualified excess benefit plan designed to maintain benefits for specified employees at the formula level in the qualified salary U.S. plan. We refer to the qualified U.S. plans and the excess benefit plan collectively as the “U.S. plans.”

During the fourth quarter of 2016, we approved amendments, effective as of December 31, 2016, to our non-U.S. and U.S. defined benefit plans. With these amendments, employees and alternate payees will accrue no future benefits under the plans after December 31, 2016. However, these amendments will not affect any benefits earned through that date.

During the years ended December 31, 2017, we made contributions to our pension plans of approximately $0.6 million, which satisfied our obligations under our defined benefit plan for the North Sea region.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

A reconciliation of the changes in projected benefit obligations (“PBO”) for our non-U.S. and U.S. plans is as follows:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Benefit obligation at beginning of year	$	72,347		$	216,577		$	69,372		$	228,390
Service cost	—			—			2,914			6,647
Interest cost	2,151			8,593			2,412			9,557
Actuarial loss (gain)	(11,265		)	19,113			19,296			(5,178		)
Benefits paid	(2,836		)	(6,795		)	(3,515		)	(5,747		)
Settlements and curtailments	(4,825		)	(2,313		)	(5,735		)	(17,092		)
Plan participants’ contributions	—			—			307			—
Foreign exchange rate changes	6,380			—			(12,704		)	—
Benefit obligation at end of year	$	61,952		$	235,175		$	72,347		$	216,577

A reconciliation of the changes in fair value of plan assets is as follows:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Fair value of plan assets at beginning of year	$	71,286		$	171,240		$	75,855		$	167,947
Actual return on plan assets	5,594			24,760			9,371			8,657
Employer contributions	651			2,348			2,832			383
Benefits paid	(2,836		)	(6,795		)	(3,515		)	(5,747		)
Plan participants’ contributions	—			—			307			—
Settlement and curtailment	(4,597		)	(2,313		)	—			—
Foreign exchange rate changes	7,043			—			(13,564		)	—
Fair value of plan assets at end of year	$	77,141		$	189,240		$	71,286		$	171,240

The funded status of the plans is as follows:

	Years Ended December 31,
	2017					2016
	Non-U.S.		U.S.			Non-U.S.			U.S.
Funded status	$	15,189	$	(45,935	)	$	(1,061	)	$	(45,337	)

Amounts recognized in the Consolidated Balance Sheets consist of:

	Years Ended December 31,
	2017					2016
	Non-U.S.		U.S.			Non-U.S.			U.S.
Other assets (noncurrent)	$	15,189	$	—		$	313		$	229
Other liabilities (current)	—		(2,312		)	—			(3,857		)
Other liabilities (noncurrent)	—		(43,623		)	(1,374		)	(41,709		)
Net amount recognized	$	15,189	$	(45,935	)	$	(1,061	)	$	(45,337	)

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Amounts recognized in AOCI consist of:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Net actuarial loss	$	2,258		$	39,569		$	17,035		$	34,200
Deferred income tax asset	(375		)	(13,849		)	(3,120		)	(12,250		)
Accumulated other comprehensive loss	$	1,883		$	25,720		$	13,915		$	21,950

Pension costs include the following components:

	Years Ended December 31,
	2017						2016						2015
	Non-U.S.			U.S.			Non-U.S.			U.S.			Non-U.S.			U.S.
Service cost	$	—		$	—		$	2,914		$	6,647		$	3,344		$	8,596
Interest cost	2,151			8,593			2,412			9,557			2,546			9,198
Return on plan assets	(2,879		)	(11,764		)	(3,393		)	(12,389		)	(3,673		)	(13,146		)
Amortization of prior service cost	—			—			104			118			104			142
Recognized net actuarial loss	743			1,464			142			4,398			315			6,158
Settlement and curtailment gains	(838		)	82			600			200			—			—
Net pension benefit cost (gain)	$	(823	)	$	(1,625	)	$	2,779		$	8,531		$	2,636		$	10,948

There is no estimated net actuarial losses or prior service cost for either of the non-U.S. plans or U.S. plans that will be amortized from AOCI into net periodic pension cost in 2018.

During the years ended December 31, 2017, 2016 and 2015, we adopted the Retirement Plan (“RP”) mortality tables with the Mortality Projection (“MP”) scale as issued by the Society of Actuaries for each of the respective years. The RP 2017, 2016 and 2015 mortality tables represent the new standard for defined benefit mortality assumptions due to adjusted life expectancies. The adoption of the updated mortality tables and the mortality improvement scales decreased our pension liability on our U.S. plans by approximately $1.6 million, $2.9 million and $3.0 million as of December 31, 2017, 2016 and 2015.

Defined Benefit Plans—Disaggregated Plan Information

Disaggregated information regarding our non-U.S. and U.S. plans is summarized below:

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Projected benefit obligation	$	61,952	$	235,175	$	72,347	$	216,577
Accumulated benefit obligation	61,952		235,175		72,347		216,577
Fair value of plan assets	77,141		189,240		71,286		171,240

The following table provides information related to those plans in which the PBO exceeded the fair value of the plan assets at December 31, 2017 and 2016. The PBO is the actuarially computed present value of earned benefits based on service to date and includes the estimated effect of any future salary increases. Employees and alternate payees have no longer accrued future benefits under the plans since December 31, 2016.

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Projected benefit obligation	$	—	$	235,175	$	5,015	$	189,244
Fair value of plan assets	—		189,240		3,642		143,678

The PBO for the unfunded excess benefit plan was $16.4 million at December 31, 2017 as compared to $16.9 million in 2016, and is included under “U.S.” in the above tables.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

The following table provides information related to those plans in which the accumulated benefit obligation (“ABO”) exceeded the fair value of plan assets at December 31, 2017 and 2016. The ABO is the actuarially computed present value of earned benefits based on service to date, but differs from the PBO in that it is based on current salary levels. Employees and alternate payees will accrue no future benefits under the plans after December 31, 2016.

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Accumulated benefit obligation	$	—	$	235,175	$	5,015	$	189,244
Fair value of plan assets	—		189,240		3,642		143,678

The ABO for the unfunded excess benefit plan was $16.4 million at December 31, 2017 as compared to $16.9 million in 2016, and is included under “U.S.” in the above tables.

Defined Benefit Plans—Key Assumptions

The key assumptions for the plans are summarized below:

	Years Ended December 31,
	2017			2016
	Non-U.S.		U.S.	Non-U.S.		U.S.
Weighted-average assumptions used to determine benefit obligations:
Discount Rate	2.60	%	2.84%-3.66%	2.15%-2.70%		3.00%-4.24%
Rate of compensation increase	N/A		N/A	3.6	%	N/A

	Years Ended December 31,
	2017			2016			2015
	Non-U.S.		U.S.	Non-U.S.	U.S.		Non-U.S.	U.S.
Weighted-average assumptions used to determine periodic benefit cost:
Discount Rate	2.48%-2.70%		3.00%-4.24%	2.15%-3.90%	3.09%-4.48%		2.60%-3.70%	2.98%-4.38%
Expected long-term return on assets	4.10	%	6.00%-6.50%	1.60%-5.00%	7.00	%	1.60%-4.90%	7.50	%
Rate of compensation increase	N/A		N/A	3.60%-4.20%	N/A		3.60%-4.10%	2.00%-5.00%

The discount rate used to calculate the net present value of future benefit obligations for our U.S. plan is based on the average of current rates earned on long-term bonds that receive a Moody’s rating of “Aa” or better. We have determined that the timing and amount of expected cash outflows on our plan reasonably match this index. For non-U.S. plans, the discount rates used to calculate the net present value of future benefit obligations are determined by using a yield curve of high quality bond portfolios with an average maturity approximating that of the liabilities.

In developing the expected long-term rate of return on assets, we considered the current level of expected returns on risk free investments (primarily government bonds), the historical level of risk premium associated with the other asset classes in which the portfolio is invested and the expectations for future returns of each asset class. The expected return for each asset class was then weighted based on the target asset allocation to develop the expected long-term rate of return on assets for the portfolio. To assist us with this analysis, we employ third-party consultants for our U.S. and non U.S. plans that use a portfolio return model.

Defined Benefit Plans—Plan Assets

Non-U.S. Plans

The NDLS pension plan has a target asset allocation of 70 percent equity securities and 30 percent debt securities. The investment objective of the plan, as adopted by the plan’s trustees, is to achieve a favorable return against a benchmark of blended United Kingdom market indices. By achieving this objective, the trustees believe the plan will be able to avoid significant volatility in the contribution rate and provide sufficient plan assets to cover the plan’s benefit obligations were the plan to be liquidated. To achieve these objectives, the trustees have given the plan’s investment managers full discretion in the day-to-day management of the plan’s assets. The plan’s assets are invested with two investment managers. The performance objective communicated to one of these investment managers is to exceed a blend of FTSE A Over 15 Year Gilts index and iBoxx

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Sterling Non Gilts All Stocks index by 1.25 percent per annum gross of fees over rolling three year periods. The performance objective communicated to the other investment manager is to exceed a blend of FTSE’s All Share index, All World North America index, All World Europe index and All World Asia Pacific index by 1.00 to 2.00 percent per annum gross of fees over rolling five year periods. This investment manager is prohibited by the trustees from investing in real estate. The trustees meet with the investment managers periodically to review and discuss their investment performance.

The actual fair values of Non-U.S. pension plans are as follows:

	Year Ended December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	280	$	280	$	—	$	—
Equity securities:
International companies	54,145		54,145		—		—
Fixed income securities:
Corporate bonds	22,716		22,716		—		—
Total	$	77,141	$	77,141	$	—	$	—

	Year Ended December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	337	$	337	$	—	$	—
Equity securities:
International companies	46,845		46,845		—		—
Fixed income securities:
Corporate bonds	20,462		20,462		—		—
Other	3,642		—		—		3,642
Total	$	71,286	$	67,644	$	—	$	3,642

U.S. Plans

The Trust invests in equity securities, fixed income debt securities, and cash equivalents and other short-term investments. The Trust may invest in these investments directly or through pooled vehicles, including mutual funds.

The Company’s overall investment strategy, or target range, is to achieve a mix of approximately 31.5 percent in equity securities, 67.3 percent in debt securities and 1.2 percent in cash holdings. Actual results may deviate from the target range, however any deviation from the target range of asset allocations must be approved by the Trust’s governing committee.

The performance objective of the Trust is to outperform the return of the Total Index Composite as constructed to reflect the target allocation weightings for each asset class. This objective should be met over a market cycle, which is defined as a period not less than three years or more than five years. U.S. equity securities (common stock, convertible preferred stock and convertible bonds) should achieve a total return (after fees) that exceeds the total return of an appropriate market index over a full market cycle of three to five years. Non-U.S. equity securities (common stock, convertible preferred stock and convertible bonds), either from developed or emerging markets, should achieve a total return (after fees) that exceeds the total return of an appropriate market index over a full market cycle of three to five years. Fixed income debt securities should achieve a total return (after fees) that exceeds the total return of an appropriate market index over a full market cycle of three to five years.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

For investments in mutual funds, the assets of the Trust are subject to the guidelines and limits imposed by such mutual fund’s prospectus and the other governing documentation at the fund level.

No shares of Noble were included in equity securities at either December 31, 2017 or 2016.

The actual fair values of U.S. pension plan assets are as follows:

	Year Ended December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	3,275	$	3,275	$	—	$	—
Equity securities:
United States	43,535		16,430		27,105		—
International	17,712		17,712		—		—
Fixed income securities:
Corporate bonds	40,793		40,793		—		—
Treasury bonds	83,925		83,925		—		—
Total	$	189,240	$	162,135	$	27,105	$	—

	Year Ended December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	2,524	$	2,524	$	—	$	—
Equity securities:
United States	80,264		80,264		—		—
International	34,049		34,049		—		—
Fixed income securities:
Corporate bonds	54,403		54,403		—		—
Total	$	171,240	$	171,240	$	—	$	—

As of December 31, 2017, no single security made up more than 10 percent of total assets of either the U.S. or the Non-U.S. plans.

Defined Benefit Plans—Cash Flows

In 2017, we made total contributions of $0.7 million and $2.3 million to our non-U.S. and U.S. pension plans, respectively. In 2016, we made total contributions of $2.8 million and $0.4 million to our non-U.S. and U.S. pension plans, respectively. In 2015, we made total contributions of $2.2 million and $0.5 million to our non-U.S. and U.S. pension plans, respectively. We expect our aggregate minimum contributions to our non-U.S. and U.S. plans in 2018, subject to applicable law, to be zero and $2.3 million, respectively. We continue to monitor and evaluate funding options based upon market conditions and may increase contributions at our discretion.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

The following table summarizes our estimated benefit payments at December 31, 2017:

			Payments by Period
	Total		2018		2019		2020		2021		2022		Thereafter
Estimated benefit payments
Non U.S. plans	$	36,203	$	3,079	$	3,189	$	3,301	$	3,419	$	3,540	$	19,675
U.S. plans	109,410		9,544		8,904		9,342		13,359		12,350		55,911
Total estimated benefit payments	$	145,613	$	12,623	$	12,093	$	12,643	$	16,778	$	15,890	$	75,586

Other Benefit Plans

We sponsor a 401(k) Restoration Plan, which is a nonqualified, unfunded employee benefit plan under which specified employees may elect to defer compensation in excess of amounts deferrable under our 401(k) savings plan. The 401(k) Restoration Plan has no assets, and amounts withheld for the 401(k) Restoration Plan are kept by us for general corporate purposes. The investments selected by employees and associated returns are tracked on a phantom basis. Accordingly, we have a liability to the employee for amounts originally withheld plus phantom investment income or less phantom investment losses. We are at risk for phantom investment income and, conversely, benefit should phantom investment losses occur. At both December 31, 2017 and 2016, our liability for the 401(k) Restoration Plan was $8.8 million and $7.7 million, respectively, and is included in “Accrued payroll and related costs.”

In 2005 we enacted a profit sharing plan, the Noble Drilling Services Inc. Profit Sharing Plan, which covers eligible employees, as defined. Participants in the plan become fully vested in the plan after three-years of service. Profit sharing contributions are discretionary, require Board of Directors approval and are made in the form of cash. Contributions recorded related to this plan totaled $3.1 million, $6.0 million and $6.5 million, respectively, for three years ended December 31, 2017, 2016 and 2015.

We sponsor other retirement, health and welfare plans and a 401(k) savings plan for the benefit of our employees. The cost of maintaining these plans for continuing operations aggregated approximately $27.6 million, $37.2 million and $54.8 million in 2017, 2016 and 2015, respectively. We do not provide post-retirement benefits (other than pensions) or any post-employment benefits to our employees.

Note 12— Derivative Instruments and Hedging Activities

We periodically enter into derivative instruments to manage our exposure to fluctuations in interest rates and foreign currency exchange rates. We have documented policies and procedures to monitor and control the use of derivative instruments. We do not engage in derivative transactions for speculative or trading purposes, nor are we a party to leveraged derivatives.

For foreign currency forward contracts, hedge effectiveness is evaluated at inception based on the matching of critical terms between derivative contracts and the hedged item. Any change in fair value resulting from ineffectiveness is recognized immediately in earnings.

On May 10, 2016, Freeport-McMoRan Inc. (“Freeport”), Freeport-McMoRan Oil & Gas LLC and one of our subsidiaries entered into an agreement terminating the contracts on the Noble Sam Croft and Noble Tom Madden (“FCX Settlement”), which were scheduled to end in July 2017 and November 2017, respectively. The FCX Settlement included two contingent payments, which are further discussed below. We accounted for these contingent payments as derivative instruments that did not qualify under the FASB standards for hedge accounting treatment, and therefore, changes in fair values were recognized as a loss in our accompanying Consolidated Statements of Operations.

Cash Flow Hedges

Several of our regional shorebases, including our North Sea operations, have a significant amount of their cash operating expenses payable in local currencies. To limit the potential risk of currency fluctuations, we periodically enter into forward contracts, which settle monthly in the operations’ respective local currencies. All of these contracts have a maturity of less than 12 months. During 2017 and 2016, we entered into forward contracts of approximately $37.6 million and $53.1 million, respectively, all of which settled during their respective years. At both December 31, 2017 and 2016, we had no outstanding derivative contracts.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

FCX Settlement

Pursuant to the FCX Settlement, Noble could have received contingent payments from the FCX Settlement on September 30, 2017, depending on the average price of oil over a 12-month period from June 30, 2016 through June 30, 2017. The average price of oil was calculated using the daily closing price of West Texas Intermediate crude oil (“WTI”) (CL1) on the New York Mercantile Exchange for the period of June 30, 2016 through June 30, 2017. If the price of WTI averaged more than $50 per barrel during such period, Freeport would have paid $25.0 million to Noble. In addition to the $25.0 million contingent payment, if the price of WTI averaged more than $65 per barrel during such period, Freeport would have paid an additional $50.0 million to Noble. These contingent payments did not qualify for hedge accounting treatment under FASB standards, and therefore, the change in fair value was recognized as a loss in our Consolidated Statements of Operations. These contingent payments are referred to as non-designated derivatives in the following tables.

The price of WTI did not average more than $50 per barrel during the 12-month period. As of June 30, 2017, the fair value of these contingent payments was reduced to zero, as the period for earning the contingent payments had ended.

Financial Statement Presentation

The following table, together with “Note 13— Fair Value of Financial Instruments,” summarizes the financial statement presentation and fair value of our derivative positions as of December 31, 2017 and 2016:

		Estimated fair value
	Balance sheet classification	December 31, 2017		December 31, 2016
Asset derivatives
Non-designated derivatives
FCX Settlement	Prepaid expenses and other current assets	$	—	$	14,400

The following table, together with “Note 13— Fair Value of Financial Instruments,” summarizes the recognized gains and losses of cash flow hedges and non-designated derivatives through AOCI or as “Contract drilling services” revenue or costs for the years ended December 31, 2017 and 2016:

	Year Ended December 31,
	2017			2016			2017		2016		2017			2016
	Unrealized gain/(loss) recognized through AOCI						Gain/(loss) reclassified from AOCI to "Contract drilling services" costs				Gain/(loss) recognized through "Contract drilling services" revenue
Cash flow hedges
Foreign currency forward contracts	$	(1,239	)	$	(1,187	)	$	—	$	—	$	1,239		$	1,187
Non-designated derivatives
FCX Settlement	$	—		$	—		$	—	$	—	$	(14,400	)	$	14,400

Note 13— Fair Value of Financial Instruments

The following tables present the carrying amount and estimated fair value of our financial instruments recognized at fair value on a recurring basis:

	December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets -
Marketable securities	$	7,321	$	7,321	$	—	$	—

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets -
Marketable securities	$	6,246	$	6,246	$	—	$	—
FCX Settlement	$	14,400	$	—	$	—	$	14,400

Our cash and cash equivalents, accounts receivable, marketable securities and accounts payable are by their nature short-term. As a result, the carrying values included in the accompanying Consolidated Balance Sheets approximate fair value.

The following table presents the activity related to the FCX Settlement asset classified within Level 3 of the valuation hierarchy for the years ended December 31, 2017 and 2016:

Balance as of December 31, 2015	$	—
Fair value recognized in earnings	17,600
Change in fair value recognized in earnings	(3,200		)
Balance as of December 31, 2016	14,400
Change in fair value recognized in earnings	(14,400		)
Balance as of December 31, 2017	$	—

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Note 14— Commitments and Contingencies

Transocean Ltd.

In January 2017, a subsidiary of Transocean Ltd. (“Transocean”) filed suit against us and certain of our subsidiaries for patent infringement in a Texas federal court. The suit claims that five of our newbuild rigs that operated in the U.S. Gulf of Mexico violated Transocean patents relating to what is generally referred to as dual-activity drilling. We were aware of the patents when we constructed the rigs, and we do not believe that our rigs infringe the Transocean patents, which are now expired. The lawsuit is proceeding and we intend to defend ourselves vigorously against this claim.

Department of Justice settlement.

In December 2014, one of our subsidiaries reached a settlement with the U.S. Department of Justice (“DOJ”) regarding our former drillship, the Noble Discoverer, and the Kulluk, a rig we were providing contract labor services for, in respect of violations of applicable law discovered in connection with a 2012 Coast Guard inspection in Alaska and our own subsequent internal investigation. Under the terms of the agreement, the subsidiary pled guilty to oil record book, ballast record and required hazardous condition reporting violations with respect to the Noble Discoverer and an oil record book violation with respect to the Kulluk. The subsidiary paid $8.2 million in fines and $4.0 million in community service payments and was placed on probation for four years, with the right to petition the court for early dismissal of probation after three years. We were granted our motion to early terminate the plea agreement effective as of March 1, 2018. If, during the remaining term of probation, the subsidiary fails to adhere to the terms of the plea agreement, the DOJ may withdraw from the plea agreement and would be free to prosecute the subsidiary on all charges arising out of its investigation, including any charges dismissed pursuant to the terms of the plea agreement, as well as potentially other charges. We also implemented a comprehensive environmental compliance plan in connection with the settlement.

Brazil commercial agent.

We have used a commercial agent in Brazil in connection with our Petróleo Brasileiro S.A. (“Petrobras”) drilling contracts. We understand that this agent has represented a number of different companies in Brazil over many years, including several offshore drilling contractors. In November 2015, this agent pled guilty in Brazil in connection with the award of a drilling contract to a competitor and implicated a Petrobras official as part of a wider investigation of Petrobras’ business practices. Following news reports relating to the agent’s involvement in the Brazil investigation in connection with his activities with other companies, we conducted a review, which is now substantially complete, of our relationship with the agent and with Petrobras. We have been in contact with the SEC, the Brazilian federal prosecutor’s office and the DOJ about this matter. We have cooperated with these agencies and they are aware of our internal review. To our knowledge, neither the agent, nor the government authorities investigating the matter, has alleged that the agent or Noble acted improperly in connection with our contracts with Petrobras.

Paragon Offshore.

On August 1, 2014, Noble-UK completed the Spin-off of its wholly-owned subsidiary, Paragon Offshore, to the holders of Noble’s ordinary shares. In February 2016, Paragon Offshore sought approval of a pre-negotiated plan of reorganization (the “Prior Plan”) by filing for voluntary relief under Chapter 11 of the United States Bankruptcy Code. As part of the Prior Plan, we entered into a settlement agreement with Paragon Offshore (the “Settlement Agreement”). The Prior Plan was rejected by the bankruptcy court in October 2016.

In April 2017, Paragon Offshore filed an updated disclosure statement and a revised plan of reorganization (the “New Plan”) in its bankruptcy proceeding. Under the New Plan, including Paragon Offshore’s revised business plan, Paragon Offshore no longer needed the Mexican tax bonding that Noble-UK was to provide under the Settlement Agreement. As a result, the Settlement Agreement was no longer applicable to the ongoing business of Paragon Offshore. Consequently, Paragon Offshore abandoned the Settlement Agreement as part of the New Plan, and the Settlement Agreement was terminated at the time of the filing of the New Plan. On May 2, 2017, Paragon Offshore announced that it had reached an agreement in principle with both its secured and unsecured creditors to revise the New Plan to, among other things, create and fund a $10.0 million litigation trust to pursue litigation against us. On June 7, 2017, the revised New Plan was approved by the bankruptcy court and Paragon Offshore emerged from bankruptcy on July 18, 2017.

On December 15, 2017, the litigation trust filed claims relating to the Spin-off against us and certain of our current and former officers and directors in the Delaware bankruptcy court that heard Paragon Offshore’s bankruptcy. The complaint alleges claims of alleged actual and constructive fraudulent conveyance, unjust enrichment and recharacterization of intercompany notes as equity claims against Noble and claims of breach of fiduciary duty and aiding and abetting breach of fiduciary duty against the officer and director defendants. We continue to believe that Paragon Offshore, at the time of the Spin-off, was properly funded, solvent and had appropriate liquidity and that the claims brought by the litigation trust are without merit and will be contested vigorously by us.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

If any of the litigation trust’s claims are successful, or if we elect to settle any claims, any damages or other amounts we would be required to or agree to pay could have a material adverse effect on our business, financial condition and results of operations. The litigation is in the very early stages, no schedule has been established, and we are not able to predict when, or if, the matters will go to trial or otherwise be concluded. We may be required to establish reserves on our financial statements in advance of the conclusion of the litigation. Such reserves may be substantial and could have a material adverse effect on our financial condition as presented in such financial statements.

Prior to the completion of the Spin-off, Noble-UK and Paragon Offshore entered into the Separation Agreements to effect the separation and Spin-off and govern the relationship between the parties after the Spin-off, including the MSA and the TSA.

As part of its final bankruptcy plan, Paragon Offshore rejected the Separation Agreements. Accordingly, the indemnity obligations that Paragon Offshore potentially would have owed us under the Separation Agreements have now terminated, including indemnities arising under the MSA and the TSA in respect of obligations related to Paragon Offshore’s business that were incurred through Noble-retained entities prior to the Spin-off. Likewise, any potential indemnity obligations that we would have owed Paragon Offshore under the Separation Agreements, including those under the MSA and the TSA in respect of Noble-UK’s business that was conducted prior to the Spin-off through Paragon Offshore-retained entities, are now also extinguished. In the absence of the Separation Agreements, liabilities relating to the respective parties will be borne by the owner of the legal entity or asset at issue and neither party will look to an allocation based on the historic relationship of an entity or asset to one of the party’s business, as had been the case under the Separation Agreements.

The rejection and ultimate termination of the indemnity and related obligations under the Separation Agreements has resulted in a number of accounting charges and benefits for the year ended December 31, 2017, and such termination may continue to affect us in the future as liabilities arise for which we would have been indemnified by Paragon Offshore or would have had to indemnify Paragon Offshore. We do not expect that, overall, the rejection of the Separation Agreements by Paragon Offshore will have a material adverse effect on our financial condition or liquidity. However, any loss we experience with respect to which we would have been able to secure indemnification from Paragon Offshore under one or more of the Separation Agreements could have an adverse impact on our results of operations in any period, which impact may be material depending on our results of operations during this down-cycle.

During the year ended December 31, 2017, we recognized net charges of $15.9 million, with a non-cash loss of $1.5 million in “Net loss from discontinued operations, net of tax” on our Consolidated Statements of Operations related to Paragon Offshore's emergence from bankruptcy.

Tax matters.

During 2014, the IRS began its examination of our tax reporting in the U.S. for the taxable years ended December 31, 2010 and 2011. The IRS examination team has completed its examination of our 2010 and 2011 U.S. tax returns and proposed adjustments and deficiencies with respect to certain items that were reported by us for the 2010 and 2011 tax year. On December 19, 2016, we received the Revenue Agent Report (“RAR”) from the IRS. We believe that we have accurately reported all amounts in our tax returns, and have submitted administrative protests with the IRS Office of Appeals contesting the examination team’s proposed adjustments. We intend to vigorously defend our reported positions, and believe the ultimate resolution of the adjustments proposed by the IRS examination team will not have a material adverse effect on our consolidated financial statements. During the third quarter of 2017, the IRS initiated its examination of our 2012, 2013, 2014 and 2015 tax returns.

In previous periods, we reported that Mexican and Brazilian authorities had made significant tax assessments against Paragon Offshore entities, a portion of which related to Noble’s business that operated through Paragon Offshore-retained entities in Mexico and Brazil prior to the spin-off. As a result of the termination of the Separation Agreements, we no longer have any indemnity obligations in respect of these tax claims made against Paragon Offshore entities, and responsibility for these claims has reverted back to the applicable Paragon Offshore entity. Audit claims of approximately $48.3 million attributable to income and other business taxes have been assessed against Noble entities in Mexico.

In previous periods, we also reported that Petrobras had notified us that it was challenging assessments by Brazilian tax authorities of withholding taxes associated with the provision of drilling rigs for its operations in Brazil during 2008 and 2009. Petrobras had also notified us that if Petrobras was ultimately forced to pay such withholding taxes, it would seek reimbursement from Paragon Offshore who would then seek reimbursement from us for the portion of the withholding that was allocable to our drilling rigs. As a result of the termination of the Separation Agreements, we no longer have any indemnity obligation in respect of these withholding claims made against a Paragon Offshore entity, and responsibility for these claims has reverted back to the applicable Paragon Offshore entity.

We operate in a number of countries throughout the world and our tax returns filed in those jurisdictions are subject to review and examination by tax authorities within those jurisdictions. We recognize uncertain tax positions that we believe have a greater than 50 percent likelihood of being sustained. We cannot predict or provide assurance as to the ultimate outcome of any existing or future assessments.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Other legal matters.

We have entered into agreements with certain of our executive officers, as well as certain other employees. These agreements become effective upon a change of control of Noble-UK (within the meaning set forth in the agreements) or a termination of employment in connection with or in anticipation of a change of control, and remain effective for three years thereafter. These agreements provide for compensation and certain other benefits under such circumstances.

We are a defendant in certain claims and litigation arising out of operations in the ordinary course of business, including personal injury claims, the resolution of which, in the opinion of management, will not be material to our financial position, results of operations or cash flows. There is inherent risk in any litigation or dispute and no assurance can be given as to the outcome of these claims.

We lease certain office space and warehouse facilities under cancelable and non-cancelable leases. Rent expense under these arrangements totaled $8.3 million, $7.8 million and $8.7 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The table below depicts future minimum rental commitments under our operating leases as of December 31, 2017:

2018		2019		2020		2021		2022		Thereafter		Total
$	18,720	$	14,046	$	2,564	$	1,853	$	1,586	$	3,840	$	42,609

Note 15— Segment and Related Information

We report our contract drilling operations as a single reportable segment, Contract Drilling Services, which reflects how we manage our business. The mobile offshore drilling units comprising our offshore rig fleet operate in a global market for contract drilling services and are often redeployed to different regions due to changing demands of our customers, which consist primarily of large, integrated, independent and government-owned or controlled oil and gas companies throughout the world. As of December 31, 2017, our contract drilling services segment conducts contract drilling operations in Canada, Far East Asia, the Middle East, the North Sea, Oceania, South America and the Gulf of Mexico.

The following table presents revenues and identifiable assets by country based on the location of the service provided:

	Revenues for Year Ended December 31,							Identifiable Assets as of December 31,
	2017			2016		2015		2017		2016
Africa	$	48,228		$	1,803	$	—	$	—	$	673,486
Argentina	—			51,627		111,589		—		—
Australia	12,262			89,847		204,822		257,415		—
Brazil	—			27,640		78,683		25,645		25,474
Brunei	45,450			42,710		—		119		312,494
Bulgaria	55,145			78,985		—		657,806		—
Canada	1,639			—		—		238,902		—
Curacao	—			—		—		647,554		—
Denmark	44,671			46,342		77,934		250,851		250,776
Gabon	—			23,385		90,082		8,378		—
Libya	—			—		136,406		—		—
Malaysia	131,696			168,826		149,597		293,297		747,059
Mexico	—			—		—		27,391		—
Qatar	16,488			608		—		—		263,108
Saudi Arabia	140,453			120,132		226,251		455,296		443,965
Singapore	—			—		—		911,515		230,897
Suriname	13,034			—		—		—		—
Tanzania	1,526			48,394		—		—		—
The Netherlands	—			42		67,765		—		—
Turkey	(3		)	—		97,065		—		—

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

United Arab Emirates	99,825		86,446		67,117		590,863		591,306
United Kingdom	209,338		95,621		87,896		894,902		1,475,651
United States	417,163		1,404,365		1,941,485		5,534,725		6,399,119
Other	—		15,292		15,560		—		26,782
Total	$	1,236,915	$	2,302,065	$	3,352,252	$	10,794,659	$	11,440,117

Note 16— Supplemental Financial Information

Consolidated Balance Sheets Information

Deferred revenues from drilling contracts totaled $114.3 million and $134.4 million at December 31, 2017 and 2016, respectively. Such amounts are included in either “Other current liabilities” or “Other liabilities” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition. Related expenses deferred under drilling contracts totaled $55.7 million at December 31, 2017 as compared to $72.8 million at December 31, 2016, and are included in either “Prepaid expenses and other current assets,” “Other assets” or “Property and equipment, net” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

In April 2015, we agreed to contract dayrate reductions for five rigs working for Saudi Arabian Oil Company (“Saudi Aramco”), which were effective from January 1, 2015 through December 31, 2015. These rates were once again adjusted downward in 2016 to the adjusted 2015 levels for the then-operating rigs. Given current market conditions and based on discussions with the customer, we do not expect the rates to return to the original contract rates on the remaining terms of the contracts. In accordance with accounting standards, we are recognizing the reductions on a straight-line basis over the remaining life of the existing Saudi Aramco contracts. At December 31, 2017 and 2016 revenues recorded in excess of billings as a result of this recognition totaled $6.9 million and $17.9 million, respectively, of which $6.9 million and $9.2 million, respectively, are included in “Prepaid expenses and other current assets” and $8.7 million, as of December 31, 2016, is included in “Other assets,” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

Consolidated Statements of Cash Flows Information

The net effect of changes in other assets and liabilities on cash flows from operating activities is as follows:

	Noble-UK									Noble-Cayman
	December 31,									December 31,
	2017			2016			2015			2017			2016			2015
Accounts receivable	$	114,456		$	179,779		$	70,165		$	114,456		$	179,779		$	70,165
Other current assets	(23,710		)	81,702			61,514			(26,556		)	79,682			23,047
Other assets	(87,377		)	139,872			106,354			(89,591		)	137,792			89,877
Accounts payable	22,638			(84,873		)	(30,771		)	22,834			(83,085		)	(28,538		)
Other current liabilities	34,568			(209,739		)	(54,940		)	35,695			(205,969		)	(34,024		)
Other liabilities	(81,812		)	(19,617		)	(26,219		)	(76,929		)	(20,960		)	(25,562		)
	$	(21,237	)	$	87,124		$	126,103		$	(20,091	)	$	87,239		$	94,965

Additional cash flow information is as follows: 

	Noble - UK						Noble - Cayman
	December 31,						December 31,
	2017		2016		2015		2017		2016		2015
Cash paid during the period for:
Interest, net of amounts capitalized	$	246,960	$	232,907	$	190,917	$	246,960	$	232,907	$	190,917
Income taxes (net of refunds)	$	30,590	$	100,544	$	89,292	$	30,590	$	100,717	$	88,948
Non-cash activities during the period:
Spin-off of Paragon Offshore	N/A		N/A		N/A		N/A		N/A		N/A

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

In accordance with our adoption of ASU No. 2016-9, prior period excess tax benefits, which were previously classified as a financing activity in “Employee stock transactions,” are now classified as an operating activity in “Net change in other assets and liabilities” on our Consolidated Statement of Cash Flows and current period excess tax benefits are now recognized in our Consolidated Statement of Operations through income taxes. Additionally, shares withheld for taxes on employee stock transactions, which were previously classified as an operating activity in “Net change in other assets and liabilities,” are now classified as a financing activity in “Employee stock transactions” on our Consolidated Statement of Cash Flows.

91

NOBLE CORPORATION PLC AND SUBSIDIARIES

NOBLE CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands)

Note 17— Condensed Consolidating Financial Information

Guarantees of Registered Securities

Noble-Cayman, or one or more 100 percent owned subsidiaries of Noble-Cayman, is a co-issuer or full and unconditional guarantor or otherwise obligated as of December 31, 2017 as follows:

	Issuer
Notes	(Co-Issuer(s))	Guarantor
$250 million 5.75% Senior Notes due 2018	NHIL	Noble-Cayman
$202 million 7.50% Senior Notes due 2019	NHUS	Noble-Cayman
	Noble Drilling Holding, LLC (“NDH” )
	Noble Drilling Services 6 LLC (“NDS6”)
$168 million 4.90% Senior Notes due 2020	NHIL	Noble-Cayman
$209 million 4.625% Senior Notes due 2021	NHIL	Noble-Cayman
$126 million 3.95% Senior Notes due 2022	NHIL	Noble-Cayman
$1 billion 7.75% Senior Notes due 2024	NHIL	Noble-Cayman
$450 million 7.70% Senior Notes due 2025	NHIL	Noble-Cayman
$400 million 6.20% Senior Notes due 2040	NHIL	Noble-Cayman
$400 million 6.05% Senior Notes due 2041	NHIL	Noble-Cayman
$500 million 5.25% Senior Notes due 2042	NHIL	Noble-Cayman
$400 million 8.70% Senior Notes due 2045	NHIL	Noble-Cayman

The following consolidating financial statements of Noble-Cayman, NHUS, NDH, NHIL, NDS6 and all other subsidiaries present investments in both consolidated and unconsolidated affiliates using the equity method of accounting.

92

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble - Cayman		NHUS		NDH			NHIL		NDS6		Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	11	$	—	$	23,160		$	29,324	$	—	$	609,516		$	—		$	662,011
Accounts receivable	—		—		24,722			—		—		179,974			—			204,696
Taxes receivable	—		93,302		3			—		—		12,040			—			105,345
Short-term notes receivable from affiliates	—		—		119,476			—		2,373,452		—			(2,492,928		)	—
Accounts receivable from affiliates	594,456		1,454		144,367			60,945		465,749		5,813,846			(7,080,817		)	—
Prepaid expenses and other current assets	—		—		1,477			—		1		63,963			—			65,441
Total current assets	594,467		94,756		313,205			90,269		2,839,202		6,679,339			(9,573,745		)	1,037,493
Property and equipment, at cost	—		—		857,784			—		—		11,176,547			—			12,034,331
Accumulated depreciation	—		—		(110,005		)	—		—		(2,435,086		)	—			(2,545,091		)
Property and equipment, net	—		—		747,779			—		—		8,741,461			—			9,489,240
Notes receivable from affiliates	3,177,248		—		1,199,815			—		3,943,299		1,175,300			(9,495,662		)	—
Investments in affiliates	4,933,978		4,550,358		5,252,135			12,560,598		7,237,474		—			(34,534,543		)	—
Other assets	2,663		16,775		8,372			—		—		238,718			—			266,528
Total assets	$	8,708,356	$	4,661,889	$	7,521,306		$	12,650,867	$	14,019,975	$	16,834,818		$	(53,603,950	)	$	10,793,261
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables to affiliates	$	—	$	1,605,243	$	—		$	—	$	—	$	887,685		$	(2,492,928	)	$	—
Current maturities of long-term debt	—		—		—			249,843		—		—			—			249,843
Accounts payable	—		—		1,467			—		—		82,406			—			83,873
Accrued payroll and related costs	—		—		4,780			—		—		50,124			—			54,904
Accounts payable to affiliates	3,410,669		393,073		1,770,066			661,375		—		845,634			(7,080,817		)	—
Taxes payable	—		—		—			—		—		33,965			—			33,965
Interest payable	2,211		—		—			83,960		12,018		—			—			98,189
Other current liabilities	—		—		5,169			—		—		66,297			—			71,466
Total current liabilities	3,412,880		1,998,316		1,781,482			995,178		12,018		1,966,111			(9,573,745		)	592,240
Long-term debt	—		—		—			3,594,332		201,535		—			—			3,795,867
Notes payable to affiliates	—		700,000		474,637			3,175,663		—		5,145,362			(9,495,662		)	—
Deferred income taxes	—		—		5			—		—		164,957			—			164,962
Other liabilities	19,929		—		30,330			—		—		239,919			—			290,178
Total liabilities	3,432,809		2,698,316		2,286,454			7,765,173		213,553		7,516,349			(19,069,407		)	4,843,247
Commitments and contingencies
Total shareholder equity	5,275,547		1,963,573		5,234,852			4,885,694		13,806,422		8,644,002			(34,534,543		)	5,275,547
Noncontrolling interests	—		—		—			—		—		674,467			—			674,467
Total equity	5,275,547		1,963,573		5,234,852			4,885,694		13,806,422		9,318,469			(34,534,543		)	5,950,014
Total liabilities and equity	$	8,708,356	$	4,661,889	$	7,521,306		$	12,650,867	$	14,019,975	$	16,834,818		$	(53,603,950	)	$	10,793,261

93

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman		NHUS		NDH			NHIL		NDS6		Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	2,537	$	—	$	10,855		$	—	$	—	$	640,441		$	—		$	653,833
Accounts receivable	—		—		33,162			—		—		285,990			—			319,152
Taxes receivable	—		21,428		—			—		—		34,052			—			55,480
Short-term notes receivable from affiliates	—		—		243,915			—		1,349,708		52,611			(1,646,234		)	—
Accounts receivable from affiliates	361,313		—		137,476			67,560		85,274		3,038,658			(3,690,281		)	—
Prepaid expenses and other current assets	270		—		1,611			—		—		86,868			—			88,749
Total current assets	364,120		21,428		427,019			67,560		1,434,982		4,138,620			(5,336,515		)	1,117,214
Property and equipment, at cost	—		—		2,376,862			—		—		9,988,026			—			12,364,888
Accumulated depreciation	—		—		(428,308		)	—		—		(1,874,632		)	—			(2,302,940		)
Property and equipment, net	—		—		1,948,554			—		—		8,113,394			—			10,061,948
Notes receivable from affiliates	3,304,672		—		112,706			69,564		5,000		1,798,614			(5,290,556		)	—
Investments in affiliates	2,848,855		2,007,016		1,411,874			8,369,728		6,129,082		—			(20,766,555		)	—
Other assets	4,292		—		5,687			—		—		168,573			—			178,552
Total assets	$	6,521,939	$	2,028,444	$	3,905,840		$	8,506,852	$	7,569,064	$	14,219,201		$	(31,393,626	)	$	11,357,714
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables to affiliates	$	—	$	171,925	$	—		$	—	$	—	$	1,474,309		$	(1,646,234	)	$	—
Current maturities of long-term debt	—		—		—			299,882		—		—			—			299,882
Accounts payable	—		—		4,228			—		—		103,640			—			107,868
Accrued payroll and related costs	—		—		4,882			—		—		43,437			—			48,319
Accounts payable to affiliates	818,737		111,801		1,995,788			123,642		—		640,313			(3,690,281		)	—
Taxes payable	—		—		—			—		—		46,561			—			46,561
Interest payable	48		—		—			56,839		4,412		—			—			61,299
Other current liabilities	12		—		4,296			—		—		63,004			—			67,312
Total current liabilities	818,797		283,726		2,009,194			480,363		4,412		2,371,264			(5,336,515		)	631,241
Long-term debt	—		—		—			3,838,807		201,422		—			—			4,040,229
Notes payable to affiliates	—		700,000		467,139			744,181		—		3,379,236			(5,290,556		)	—
Deferred income taxes	—		—		534			—		—		1,550			—			2,084
Other liabilities	19,929		—		24,035			—		—		248,219			—			292,183
Total liabilities	838,726		983,726		2,500,902			5,063,351		205,834		6,000,269			(10,627,071		)	4,965,737
Commitments and contingencies
Total shareholder equity	5,683,213		1,044,718		1,404,938			3,443,501		7,363,230		7,106,323			(20,362,710		)	5,683,213
Noncontrolling interests	—		—		—			—		—		1,112,609			(403,845		)	708,764
Total equity	5,683,213		1,044,718		1,404,938			3,443,501		7,363,230		8,218,932			(20,766,555		)	6,391,977
Total liabilities and equity	$	6,521,939	$	2,028,444	$	3,905,840		$	8,506,852	$	7,569,064	$	14,219,201		$	(31,393,626	)	$	11,357,714

94

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	168,592		$	—		$	—		$	1,086,320		$	(47,886	)	$	1,207,026
Reimbursables and other	—			—			3,443			—			—			26,446			—			29,889
Total operating revenues	—			—			172,035			—			—			1,112,766			(47,886		)	1,236,915
Operating costs and expenses
Contract drilling services	304			12,090			43,161			3,115			—			627,251			(47,886		)	638,035
Reimbursables	—			—			1,992			—			—			16,443			—			18,435
Depreciation and amortization	—			—			58,236			—			—			484,883			—			543,119
General and administrative	129			5,761			—			1,588			9			33,600			—			41,087
Loss on impairment	—			—			45,012			—			—			76,627			—			121,639
Total operating costs and expenses	433			17,851			148,401			4,703			9			1,238,804			(47,886		)	1,362,315
Operating income (loss)	(433		)	(17,851		)	23,634			(4,703		)	(9		)	(126,038		)	—			(125,400		)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	(476,382		)	(528,702		)	82,596			188,809			17,874			—			715,805			—
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax	2,967			4,566			—			—			—			—			(7,533		)	—
Interest expense, net of amounts capitalized	(10,951		)	(32,838		)	(13,493		)	(430,580		)	(15,288		)	(130,442		)	341,603			(291,989		)
Interest income and other, net	10,483			(141		)	87,287			4,771			224,772			19,716			(341,603		)	5,285
Income (loss) before income taxes	(474,316		)	(574,966		)	180,024			(241,703		)	227,349			(236,764		)	708,272			(412,104		)
Income tax benefit (provision)	—			241,960			(440		)	—			—			(284,115		)	—			(42,595		)
Net income (loss) from continuing operations	(474,316		)	(333,006		)	179,584			(241,703		)	227,349			(520,879		)	708,272			(454,699		)
Net income (loss) from discontinuing operations, net of tax	—			(1,598		)	—			—			—			4,565			—			2,967
Net income (loss)	(474,316		)	(334,604		)	179,584			(241,703		)	227,349			(516,314		)	708,272			(451,732		)
Net (income) loss attributable to noncontrolling interests	—			—			—			—			—			(20,589		)	(1,995		)	(22,584		)
Net income (loss) attributable to Noble Corporation	(474,316		)	(334,604		)	179,584			(241,703		)	227,349			(536,903		)	706,277			(474,316		)
Other comprehensive income (loss), net	9,252			—			—			—			—			9,252			(9,252		)	9,252
Comprehensive income (loss) attributable to Noble Corporation	$	(465,064	)	$	(334,604	)	$	179,584		$	(241,703	)	$	227,349		$	(527,651	)	$	697,025		$	(465,064	)

95

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	250,049		$	—		$	—		$	2,086,848		$	(94,697	)	$	2,242,200
Reimbursables and other	—			—			9,190			—			—			51,375			—			60,565
Total operating revenues	—			—			259,239			—			—			2,138,223			(94,697		)	2,302,765
Operating costs and expenses
Contract drilling services	4,532			18,902			70,801			84,309			—			789,814			(94,697		)	873,661
Reimbursables	—			—			8,231			—			—			37,268			—			45,499
Depreciation and amortization	—			—			91,802			—			—			519,211			—			611,013
General and administrative	1,264			8,716			—			40,082			1			(4,018		)	—			46,045
Loss on impairment	—			—			—			—			—			1,458,749			—			1,458,749
Total operating costs and expenses	5,796			27,618			170,834			124,391			1			2,801,024			(94,697		)	3,034,967
Operating income (loss)	(5,796		)	(27,618		)	88,405			(124,391		)	(1		)	(662,801		)	—			(732,202		)
Other income (expense)
Income (loss) of unconsolidated affiliates	(962,662		)	(257,142		)	(980,099		)	(333,446		)	515,518			—			2,017,831			—
Interest expense, net of amounts capitalized	(27,891		)	(70,494		)	(11,461		)	(228,423		)	(15,117		)	(122,345		)	252,816			(222,915		)
Gain on extinguishment of debt, net	—			—			—			17,814			—			—			—			17,814
Interest income and other, net	96,635			120			12,616			20,412			15,058			108,108			(252,816		)	133
Income (loss) before income taxes	(899,714		)	(355,134		)	(890,539		)	(648,034		)	515,458			(677,038		)	2,017,831			(937,170		)
Income tax benefit (provision)	—			(42,522		)	163			—			—			151,522			—			109,163
Net Income (loss)	(899,714		)	(397,656		)	(890,376		)	(648,034		)	515,458			(525,516		)	2,017,831			(828,007		)
Net income attributable to noncontrolling interests	—			—			—			—			—			(39,294		)	(32,413		)	(71,707		)
Net income (loss) attributable to Noble Corporation	(899,714		)	(397,656		)	(890,376		)	(648,034		)	515,458			(564,810		)	1,985,418			(899,714		)
Other comprehensive income (loss), net	11,035			—			—			—			—			11,035			(11,035		)	11,035
Comprehensive income (loss) attributable to Noble Corporation	$	(888,679	)	$	(397,656	)	$	(890,376	)	$	(648,034	)	$	515,458		$	(553,775	)	$	1,974,383		$	(888,679	)

96

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF INCOME and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2015

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL				NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	354,657		$	—			$	—		$	3,325,608		$	(418,655	)	$	3,261,610
Reimbursables and other	—			—			18,529			—				—			72,313			—			90,842
Total operating revenues	—			—			373,186			—				—			3,397,921			(418,655		)	3,352,452
Operating costs and expenses
Contract drilling services	3,611			19,160			395,365			84,005				—			1,142,891			(418,655		)	1,226,377
Reimbursables	—			—			13,686			—				—			56,590			—			70,276
Depreciation and amortization	—			—			77,187			—				—			556,057			—			633,244
General and administrative	1,138			8,683			—			38,167				1			7,446			—			55,435
Loss on impairment	—			—			13			—				—			418,285			—			418,298
Total operating costs and expenses	4,749			27,843			486,251			122,172			—	1			2,181,269			(418,655		)	2,403,630
Operating income (loss)	(4,749		)	(27,843		)	(113,065		)	(122,172		)		(1		)	1,216,652			—			948,822
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	591,297			73,319			190,335			936,429				647,856			—			(2,439,236		)	—
Interest expense, net of amounts capitalized	(75,925		)	(4,932		)	(12,110		)	(224,894		)		(25,578		)	(68,670		)	198,255			(213,854		)
Gain on extinguishment of debt, net	—			—			—			—				—			—			—			—
Interest income and other, net	24,188			4,852			52,026			71,617				5,165			75,071			(198,255		)	34,664
Income (loss) from continuing operations before income taxes	534,811			45,396			117,186			660,980				627,442			1,223,053			(2,439,236		)	769,632
Income tax provision	—			(77,929		)	(4,466		)	—				—			(80,225		)	—			(162,620		)
Net income (loss)	534,811			(32,533		)	112,720			660,980				627,442			1,142,828			(2,439,236		)	607,012
Net (income) loss attributable to noncontrolling interests	—			—			—			—				—			(105,240		)	33,039			(72,201		)
Net income (loss) attributable to Noble Corporation	534,811			(32,533		)	112,720			660,980				627,442			1,037,588			(2,406,197		)	534,811
Other comprehensive income (loss), net	6,243			—			—			—				—			6,243			(6,243		)	6,243
Comprehensive income (loss) attributable to Noble Corporation	$	541,054		$	(32,533	)	$	112,720		$	660,980			$	627,442		$	1,043,831		$	(2,412,440	)	$	541,054

97

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments		Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	32,195		$	100,883		$	209,898		$	(403,391	)	$	217,080		$	335,672		$	—	$	492,337
Cash flows from investing activities
Capital expenditures	—			—			(3,622		)	—			—			(154,348		)	—		(157,970		)
Proceeds from disposal of assets	—			—			46			—			—			2,336			—		2,382
Net cash used in investing activities	—			—			(3,576		)	—			—			(152,012		)	—		(155,588		)
Cash flows from financing activities
Repayment of long-term debt	—			—			—			(300,000		)	—			—			—		(300,000		)
Debt issuance costs on senior notes and credit facility	—			—			—			(42		)	—			—			—		(42		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(56,881		)	—		(56,881		)
Contributions from parent company, net	28,352			—			—			—			—			—			—		28,352
Advances (to) from affiliates	(63,073		)	(100,883		)	(194,017		)	732,757			(217,080		)	(157,704		)	—		—
Net cash provided by (used in) financing activities	(34,721		)	(100,883		)	(194,017		)	432,715			(217,080		)	(214,585		)	—		(328,571		)
Net change in cash and cash equivalents	(2,526		)	—			12,305			29,324			—			(30,925		)	—		8,178
Cash and cash equivalents, beginning of period	2,537			—			10,855			—			—			640,441			—		653,833
Cash and cash equivalents, end of period	$	11		$	—		$	23,160		$	29,324		$	—		$	609,516		$	—	$	662,011

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CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments		Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	97,388		$	(150,735	)	$	149,431		$	(344,112	)	$	(60	)	$	1,404,359		$	—	$	1,156,271
Cash flows from investing activities
Capital expenditures	—			—			(492,985		)	—			—			(201,754		)	—		(694,739		)
Proceeds from disposal of assets	—			—			—			—			—			24,808			—		24,808
Net cash used in investing activities	—			—			(492,985		)	—			—			(176,946		)	—		(669,931		)
Cash flows from financing activities
Repayment of long-term debt	—			—			—			(1,049,338		)	—			—			—		(1,049,338		)
Issuance of senior notes	—			—			—			980,100			—			—			—		980,100
Tender offer premium	—			—			—			(24,649		)	—			—			—		(24,649		)
Debt issuance costs on senior notes and credit facilities	—			—			—			(12,111		)	—			—			—		(12,111		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(85,944		)	—		(85,944		)
Distributions to parent company, net	(152,360		)	—			—			—			—			—			—		(152,360		)
Advances (to) from affiliates	55,882			150,735			352,308			450,110			60			(1,009,095		)	—		—
Net cash provided by (used in) financing activities	(96,478		)	150,735			352,308			344,112			60			(1,095,039		)	—		(344,302		)
Net change in cash and cash equivalents	910			—			8,754			—			—			132,374			—		142,038
Cash and cash equivalents, beginning of period	1,627			—			2,101			—			—			508,067			—		511,795
Cash and cash equivalents, end of period	$	2,537		$	—		$	10,855		$	—		$	—		$	640,441		$	—	$	653,833

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CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2015

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	(31,562	)	$	(53,686	)	$	15,207		$	(267,735	)	$	(20,292	)	$	2,105,575		$	—		$	1,747,507
Cash flows from investing activities
Capital expenditures	—			—			(116,594		)	—			—			(320,557		)	—			(437,151		)
Proceeds from disposal of assets	—			—			—			—			—			4,614			—			4,614
Notes receivable from affiliates	124,951			—			—			608,771			—			—			(733,722		)	—
Net cash provided by (used in) investing activities	124,951			—			(116,594		)	608,771			—			(315,943		)	(733,722		)	(432,537		)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	(1,123,495		)	—			—			—			—			—			—			(1,123,495		)
Repayment of long-term debt	—			—			—			(350,000		)	—			—			—			(350,000		)
Issuance of senior notes	—			—			—			1,092,728			—			—			—			1,092,728
Debt issuance costs on senior notes and credit facilities	(6,450		)	—			—			(9,620		)	—			—			—			(16,070		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(71,504		)	—			(71,504		)
Distributions to parent company, net	(400,614		)	—			—			—			—			—			—			(400,614		)
Notes payable to affiliates	(608,771		)	—			—			—			—			(124,951		)	733,722			—
Advances (to) from affiliates	2,047,563			53,686			103,234			(1,074,144		)	20,292			(1,150,631		)	—			—
Net cash provided by (used in) financing activities	(91,767		)	53,686			103,234			(341,036		)	20,292			(1,347,086		)	733,722			(868,955		)
Net change in cash and cash equivalents	1,622			—			1,847			—			—			442,546			—			446,015
Cash and cash equivalents, beginning of period	5			—			254			—			—			65,521			—			65,780
Cash and cash equivalents, end of period	$	1,627		$	—		$	2,101		$	—		$	—		$	508,067		$	—		$	511,795

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NOBLE CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

Note 18— Unaudited Interim Financial Data

Unaudited interim consolidated financial information from continuing operations for Noble-UK is as follows:

	Quarters Ended
	March 31			June 30			September 30			December 31
2017
Operating revenues	$	362,976		$	278,142		$	266,212		$	329,585
Operating income (loss)	45,847			(43,875		)	(55,588		)	(109,656		)
Net loss from continuing operations	(301,694		)	(91,864		)	(96,792		)	(24,675		)
Net loss from discontinued operations, net of tax	—			(1,486		)	—			—
Net loss per share from continuing operations attributable to Noble-UK (1)
Basic
Net loss from continuing operations	(1.24		)	(0.37		)	(0.40		)	(0.10		)
Net loss from discontinued operations, net of tax	—			(0.01		)	—			—
Diluted
Net loss from continuing operations	(1.24		)	(0.37		)	(0.40		)	(0.10		)
Net loss from discontinued operations, net of tax	—			(0.01		)	—			—

	Quarter Ended
	March 31		June 30		September 30			December 31
2016
Operating revenues	$	611,973	$	894,783	$	385,153		$	410,156
Operating income (loss)	175,460		449,714		(2,208		)	(1,384,912		)
Net income (loss) from continuing operations attributable to Noble-UK	105,485		322,866		(55,081		)	(1,302,850		)
Net income (loss) per share from continuing operations attributable to Noble-UK (1)
Basic
Net income (loss) from continuing operations	0.42		1.28		(0.23		)	(5.36		)
Diluted
Net income (loss) from continuing operations	0.42		1.28		(0.23		)	(5.36		)

⁽¹⁾  Net income (loss) per share is computed independently for each of the quarters presented. Therefore, the sum of the quarters’ net income (loss) per share may not equal the total computed for the year.

Note 19— Subsequent Events

2015 Credit Facility Amendment Effectiveness

On January 3, 2018, the Amendment to the 2015 Credit Facility became fully effective. The Amendment caused, among other things a reduction in the aggregate principal amount of commitments under the 2015 Credit Facility to $300.0 million and the reduction of the 2015 Credit Facility's letter of credit sub-facility to zero dollars. The maturity of the 2015 Credit Facility remains January 2020.

2017 Credit Facility Amendment Effectiveness

On January 3, 2018, borrowings up to a maximum aggregate amount of $1.5 billion became available under the 2017 Credit Facility. The 2017 Credit Facility matures in January 2023.

Debt Issuance

On January 31, 2018, NHIL issued and sold $750.0 million aggregate principal amount of the 2026 Notes, through our indirect wholly-owned subsidiary, NHIL. The 2026 Notes are issued under an indenture by and among NHIL, Noble-Cayman, certain other subsidiaries of Noble-Cayman named therein (the “Subsidiary Guarantors”), and are guaranteed by Noble-Cayman and the Guarantor Subsidiaries. The proceeds of the

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NOBLE CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

offering of approximately $737.0 million, after estimated expenses, were used to retire a portion of our near-term senior notes in a related tender offer.

The 2026 Notes are redeemable, in whole or in part, prior to February 1, 2021, at a redemption price equal to 100% of the aggregate principal amount of the 2026 Notes being redeemed, plus a make-whole premium. The 2026 Notes are redeemable prior to February 1, 2021, at a redemption price equal to 40% of the aggregate principal amount in the event of an equity offering. Further, the 2026 Notes may be redeemed in whole as a result of changes in tax law. On or after February 1, 2021, we may redeem all or any portion of the 2026 Notes at various redemption prices set forth in the indenture.

Upon (i) the occurrence of a change of control and (ii) a downgrade of the rating of the 2026 Notes within 60 days after the change of control by at least two of Moody’s Investors Service, Inc., Standard & Poor’s Financial Services LLC or Fitch Ratings Inc., We will be required to make an offer to repurchase all outstanding 2026 Notes at a price in cash equal to 101%of the aggregate principal amount of the 2026 Notes repurchased, plus any accrued and unpaid interest to, but excluding, the repurchase date.

The indenture for the 2026 Notes contains certain covenants and restrictions, including, among others, restrictions on our and our subsidiaries’ ability, as applicable, to create certain liens, enter into certain sale and leaseback transactions, merge or consolidate with another entity, sell all or substantially all of their assets and allow our subsidiaries to incur certain additional indebtedness. Additionally, the Subsidiary Guarantors must own, directly or indirectly, (i) assets comprising at least 85% of the revenue of Noble-Cayman and its subsidiaries on a consolidated basis and (ii) jackups, semisubmersibles, drillships, submersibles or other mobile offshore drilling units of material importance, the combined book value of which comprises at least 85% of the combined book value of all such assets of Noble-Cayman and its subsidiaries on a consolidated basis, in each case, with respect to the most recently completed fiscal year.

Tender Offer

In January 2018, we commenced cash tender offers for our 2018 Notes, 2019 Notes, 2020 Notes, 2021 Notes, 2022 Notes and 2024 Notes. On February 1, 2018, we purchased $754.2 million aggregate principal amount of these senior notes for $750.0 million, plus accrued interest, using the net proceeds of the $750.0 million2026 Notes issuance in January 2018 and cash on hand. In February 2018, as a result of this transaction, we recognized a net loss of approximately $2.0 million.

In February 2018, we purchased an aggregate principal amount of $61.9 million of the remaining 2019 Notes for approximately $65.3 million, plus accrued interest, in accordance with the optional redemption feature in our indenture. As a result of this transaction, we recognized a net loss of approximately $3.5 million.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 

None.

Item 9A. Evaluation of Disclosure Controls and Procedures

Julie J. Robertson, Chairman, President and Chief Executive Officer of Noble-UK, and Adam C. Peakes, Senior Vice President and Chief Financial Officer of Noble-UK, have evaluated the disclosure controls and procedures of Noble-UK as of the end of the period covered by this report. On the basis of this evaluation, Mrs. Robertson and Mr. Peakes have concluded that Noble-UK’s disclosure controls and procedures were effective as of December 31, 2017. Noble-UK’s disclosure controls and procedures are designed to ensure that information required to be disclosed by Noble-UK in the reports that it files with or submits to the SEC are recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and is accumulated and communicated to management as appropriate to allow timely decisions regarding required disclosure.

Julie J. Robertson, President and Chief Executive Officer of Noble-Cayman and Thomas B Sloan Jr., Vice President and Chief Financial Officer of Noble-Cayman, have evaluated the disclosure controls and procedures of Noble-Cayman as of the end of the period covered by this report. On the basis of this evaluation, Mrs. Robertson and Mr. Sloan have concluded that Noble-Cayman’s disclosure controls and procedures were effective as of December 31, 2017. Noble-Cayman’s disclosure controls and procedures are designed to ensure that information required to be disclosed by Noble-Cayman in the reports that it files with or submits to the SEC are recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and is accumulated and communicated to management as appropriate to allow timely decisions regarding required disclosure.

102

Changes in Internal Control Over Financial Reporting

There were no changes in either Noble-UK’s or Noble-Cayman’s internal control over financial reporting that occurred during the year ended December 31, 2017 that have materially affected, or are reasonably likely to materially affect, the internal control over financial reporting of each of Noble-UK or Noble-Cayman.

Management’s Annual Report on Internal Control Over Financial Reporting

The management of Noble-UK and Noble-Cayman is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rule 13a-15(f) promulgated under the U.S. Securities Exchange Act of 1934, as amended.

Internal control over financial reporting includes the controls themselves, monitoring (including internal auditing practices), and actions taken to correct deficiencies as identified. There are inherent limitations to the effectiveness of internal control over financial reporting, however well designed, including the possibility of human error and the possible circumvention or overriding of controls. The design of an internal control system is also based in part upon assumptions and judgments made by management about the likelihood of future events, and there can be no assurance that an internal control will be effective under all potential future conditions. As a result, even an effective system of internal controls can provide no more than reasonable assurance with respect to the fair presentation of financial statements and the processes under which they were prepared.

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013. Based on the assessment by management of Noble-UK and Noble-Cayman, both Noble-UK and Noble-Cayman maintained effective internal control over financial reporting as of December 31, 2017.

PricewaterhouseCoopers LLP, the independent registered public accounting firm that audited our financial statements included in this Annual Report on Form 10-K, has audited the effectiveness of internal control over financial reporting as of December 31, 2017 as stated in their report, which is provided in Part II, Item 8 “ Financial Statements and Supplementary Data” in this Annual Report on Form 10-K.

103

Item 9B. Other Information.

None.

PART III

Item 10. Directors, Executive Officers and Corporate Governance.

The sections entitled “Election of Directors,” “Additional Information Regarding the Board of Directors,” “Section 16(a) Beneficial Ownership Reporting Compliance” and “Other Matters” appearing in the proxy statement for the 2018 annual general meeting of shareholders (the “2018 Proxy Statement”), will set forth certain information with respect to directors, certain corporate governance matters and reporting under Section 16(a) of the Securities Exchange Act of 1934, and are incorporated in this report by reference.

Executive Officers of the Registrant

The following table presents certain information as of February 23, 2018 with respect to our executive officers:

Name	Age	Position
Julie J. Robertson	62	Chairman, President and Chief Executive Officer
Adam C. Peakes	44	Senior Vice President and Chief Financial Officer
William E. Turcotte	54	Senior Vice President and General Counsel
Robert W. Eifler	38	Vice President and General Manager - Marketing and Contracts
Scott W. Marks	58	Senior Vice President - Engineering
Bernie G. Wolford	58	Senior Vice President - Operations
Thomas B Sloan Jr.	51	Vice President and Controller

Julie J. Robertson was named Chairman of the Board, President and Chief Executive Officer of the Company in January, 2018. Previously, Ms. Robertson served as Executive Vice President of the Company from February 2006 and as Senior Vice President - Administration from July 2001 to February 2006. Ms. Robertson also served continuously as Corporate Secretary of the Company from December 1993 until assuming the Chairman’s role in 2018. Ms. Robertson has also served as Vice President - Administration of Noble Drilling from 1996 to July 2001 and as Vice President - Administration of Noble Drilling Services Inc beginning in 1994. From 1989 to 1994, Ms. Robertson served consecutively as Manager of Benefits and Director of Human Resources for Noble Drilling Services Inc. Prior to 1989, Ms. Robertson served consecutively in the positions of Risk and Benefits Manager and Marketing Services Coordinator for a predecessor subsidiary of Noble, beginning in 1979.

Adam C. Peakes was named Senior Vice President and Chief Financial Officer effective January 23, 2017. Prior to joining Noble, Mr. Peakes served as Managing Director and Head of OFS Investment Banking since 2011 at Tudor, Pickering, Holt & Company, an integrated investment and merchant bank serving the energy industry. Prior to that time, Mr. Peakes served in various roles at Goldman Sachs & Company from 1999 to 2011, including most recently as Managing Director, Global Natural Resources in the Investment Banking Division.

William E. Turcotte was named Senior Vice President and General Counsel effective December 16, 2008. Prior to joining Noble, Mr. Turcotte served as Senior Vice President, General Counsel and Corporate Secretary of Cornell Companies, Inc., a private corrections company, since March 2007. He served as Vice President, Associate General Counsel and Assistant Secretary of Transocean, Inc., an offshore oil and gas drilling contractor, from October 2005 to March 2007 and as Associate General Counsel and Assistant Secretary from January 2000 to October 2005. From 1992 to 2000, Mr. Turcotte served in various legal positions with Schlumberger Limited in Houston, Caracas and Paris. Mr. Turcotte was in private practice prior to joining Schlumberger.

Robert W. Eifler was named Vice President and General Manager - Marketing and Contracts effective July 17, 2017. Before assuming his currently role, Mr. Eifler led Noble's marketing and contracts efforts for the Eastern Hemisphere while based in London. From November 2013 to March 2015, Mr. Eifler worked for Hercules Offshore, Inc., and offshore driller, as Director International Marketing. Mr. Eifler originally joined Noble in February 2005 as part of the management development program and held numerous operational and held numerous operations and marketing roles with increasing responsibility around the world until joining Hercules in 2013.

Scott W. Marks was named Senior Vice President – Engineering effective January 1, 2007. Mr. Marks served as Vice President – Project Management and Construction from August 2006 to January 2007, as Vice President – Support Engineering from September 2005 to August 2006 and as Director of Engineering from January 2003 to September 2005. Mr. Marks has been with Noble since 1991, serving as a Project Manager and as a Drilling Superintendent prior to 2003.

104

Bernie G. Wolford was named Senior Vice President – Operations effective February 3, 2012. Mr. Wolford served as Vice President—Operational Excellence from March 2010 to February 2012. From January 2003 until March 2010, Mr. Wolford was self-employed. During that time, he provided consulting services to Noble as a contractor on the construction of the Noble Dave Beard from March 2009 to December 2009. Mr. Wolford is also a significant shareholder of Mass Technology Corporation, an independent downstream refining and storage company, and he supported the operations of that company from February 2007 to February 2009. Mr. Wolford began his career in the offshore drilling industry with Transworld Drilling in 1981, which was acquired by Noble in 1991. From 1981 through December 2002, he served in various roles in engineering, project management and operations with Transworld and Noble.

Thomas B Sloan Jr. was named Vice President and Controller effective July 24, 2017. Mr. Sloan is also the Company's Principal Accounting Officer. Prior to joining Noble, Mr. Sloan served as Vice President, Controller and Principal Accounting Officer at Tesco Corporation, a drilling equipment manufacturer from May 2014. Prior to that time, Mr. Sloan held several positions from 2011 to 2013 at the offshore driller, Ocean Rig, including Vice President and Corporate Controller.

We have adopted a Code of Business Conduct and Ethics that applies to directors, officers and employees, including our principal executive officer, principal financial officer and principal accounting officer. Our Code of Business Conduct and Ethics is posted on our website at http://www.noblecorp.com in the “Governance” area. Changes to and waivers granted with respect to our Code of Business Conduct and Ethics related to the officers identified above, and our other executive officers and directors, that we are required to disclose pursuant to applicable rules and regulations of the SEC will also be posted on our website.

Item 11. Executive Compensation.

The sections entitled “Executive Compensation” and “Compensation Committee Report” appearing in the 2018 Proxy Statement set forth certain information with respect to the compensation of our management and our compensation committee report, and are incorporated in this report by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The sections entitled “Equity Compensation Plan Information” and “Security Ownership of Certain Beneficial Owners and Management” appearing in the 2018 Proxy Statement set forth certain information with respect to securities authorized for issuance under equity compensation plans and the ownership of our voting securities and equity securities, and are incorporated in this report by reference.

Item 13. Certain Relationships and Related Transactions and Director Independence.

The sections entitled “Additional Information Regarding the Board of Directors—Board Independence” and “Policies and Procedures Relating to Transactions with Related Persons” appearing in the 2018 Proxy Statement set forth certain information with respect to director independence and transactions with related persons, and are incorporated in this report by reference.

Item 14. Principal Accounting Fees and Services.

The section entitled “Auditors” appearing in the 2018 Proxy Statement sets forth certain information with respect to accounting fees and services, and is incorporated in this report by reference.

PART IV

Item 15. Exhibits, Financial Statement Schedules.

(a) The following documents are filed as part of this report:

(1) A list of the financial statements filed as a part of this report is set forth in Item 8 on page 49 and is incorporated herein by reference.

(2) Financial Statement Schedules:

All schedules are omitted because they are either not applicable or required information is shown in the financial statements or notes thereto.

(3) Exhibits:

105

The information required by this Item 15(a)(3) is set forth in the Index to Exhibits accompanying this Annual Report on Form 10-K and is incorporated herein by reference.

Item 16. Form 10-K Summary.

None.

106

Index to Exhibits

Exhibit Number	Exhibit
2.1	Merger Agreement, dated as of June 30, 2013, between Noble Corporation, a Swiss corporation (“Noble-Swiss”) and Noble Corporation Limited (filed as Exhibit 2.1 to Noble-Swiss’ Current Report on Form 8-K filed on July 1, 2013 and incorporated herein by reference).
2.2	Agreement and Plan of Merger, Reorganization and Consolidation, dated as of December 19, 2008, among Noble Corporation, a Swiss corporation, Noble Corporation, a Cayman Islands company (“Noble-Cayman”), and Noble Cayman Acquisition Ltd. (filed as Exhibit 1.1 to Noble-Cayman’s Current Report on Form 8-K filed on December 22, 2008 and incorporated herein by reference).
2.3	Amendment No. 1 to Agreement and Plan of Merger, Reorganization and Consolidation, dated as of February 4, 2009, among Noble-Swiss, Noble-Cayman and Noble Cayman Acquisition Ltd. (filed as Exhibit 2.2 to Noble-Cayman’s Current Report on Form 8-K filed on February 4, 2009 and incorporated herein by reference).
3.1	Composite Copy of Articles of Association of Noble Corporation plc, a company incorporated under the laws of England and Wales (“Noble-UK”), as of June 10, 2014 (filed as Exhibit 3.1 to Noble-UK’s Quarterly Report on Form 10-Q for the quarter ended March 30, 2014 and incorporated herein by reference).
3.2	Memorandum and Articles of Association of Noble-Cayman (filed as Exhibit 3.1 to Noble-Cayman’s Current Report on Form 8-K filed on March 30, 2009 and incorporated herein by reference).
4.1	Indenture, dated as of March 1, 1999, between Noble Drilling Corporation, as Issuer, and JPMorgan Chase Bank, N.A. (formerly Chase Bank of Texas, N.A.), as Trustee (filed as Exhibit 4.1 to Noble Drilling Corporation’s Current Report on Form 8-K filed on March 23, 1999 and incorporated herein by reference).
4.2	First Supplemental Indenture, dated as of March 16, 1999, between Noble Drilling Corporation, as Issuer, and JPMorgan Chase Bank, N.A. (formerly Chase Bank of Texas, N.A.), as Trustee, relating to 7.50% Senior Notes due 2019 of Noble Drilling Corporation (filed as Exhibit 4.2 to Noble Drilling Corporation’s Current Report on Form 8-K filed on March 23, 1999 and incorporated herein by reference).
4.3	Second Supplemental Indenture, dated as of April 30, 2002, between Noble Drilling Corporation, as Issuer, Noble Holding (U.S.) Corporation, as Guarantor, and Noble-Cayman, as Guarantor, and JPMorgan Chase Bank, N.A., as Trustee, relating to 7.50% Senior Notes due 2019 of Noble Drilling Corporation (filed as Exhibit 4.6 to Noble-Cayman’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2002 and incorporated herein by reference).
4.4	Third Supplemental Indenture, dated as of December 20, 2005, between Noble Drilling Corporation, as Issuer, Noble Drilling Holding LLC, as Co-Issuer, Noble Holding (U.S.) Corporation, as Guarantor, Noble-Cayman, as Guarantor, and JPMorgan Chase Bank, N.A., as Trustee, relating to 7.50% Senior Notes due 2019 of Noble Drilling Corporation (filed as Exhibit 4.14 to Noble-Cayman’s Registration Statement on Form S-3 (No. 333-131885) and incorporated herein by reference).
4.5	Fourth Supplemental Indenture, dated as of September 25, 2009, among Noble Drilling Corporation, as Issuer, Noble Drilling Holding LLC, as Co-Issuer, Noble Drilling Services 1 LLC, as Co-Issuer, Noble Holding (U.S.) Corporation, as Guarantor, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 7.50% Senior Notes due 2019 of Noble Drilling Corporation (filed as Exhibit 4.1 to Noble-Swiss’ Current Report on Form 8-K filed on October 1, 2009 and incorporated herein by reference).

107

Exhibit Number	Exhibit
4.6	Fifth Supplemental Indenture, dated as of October 1, 2009, among Noble Drilling Corporation, as Issuer, Noble Drilling Holding LLC, as Co-Issuer, Noble Drilling Services 6 LLC, as Co-Issuer, Noble Holding (U.S.) Corporation, as Guarantor, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 7.50% Senior Notes due 2019 of Noble Drilling Corporation (filed as Exhibit 4.2 to Noble-Swiss’ Current Report on Form 8-K filed on October 1, 2009 and incorporated herein by reference).
4.7	Sixth Supplemental Indenture, dated as of May 7, 2014, among Noble Drilling Corporation, as Issuer, Noble Holding (U.S.) Corporation, as Successor Issuer, Noble Drilling Services 6 LLC, as Co-Issuer, Noble Drilling Holding LLC, as Co-Issuer, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 7.50% Senior Notes due 2019 of Noble Holding (U.S.) Corporation (filed as Exhibit 4.1 to Noble-UK’s Current Report on Form 8-K filed on May 7, 2014 and incorporated herein by reference).
4.8	Seventh Supplemental Indenture, dated as of March 8, 2017, among Noble Holding (U.S.) LLC, as Successor Issuer, Noble Drilling Services 6 LLC, as Co-Issuer, Noble Drilling Holding LLC, as Co-Issuer, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 7.50% Senior Notes due 2019 of Noble Holding (U.S.) LLC (filed as Exhibit 4.1 to Noble-UK’s Current Report on Form 8-K/A filed on March 14, 2017 and incorporated herein by reference).
4.9	Eighth Supplemental Indenture, dated as of January 31, 2018, among Noble Holding (U.S.) LLC, as Successor Issuer, Noble Drilling Services 6 LLC, as Co-Issuer, Noble Drilling Holding LLC, as Co-Issuer, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 7.50% Senior Notes due 2019 of Noble Holding (U.S.) LLC (filed as Exhibit 4.4 to Noble-UK’s Current Report on Form 8-K filed on January 31, 2018 and incorporated herein by reference).
4.10	Indenture, dated as of November 21, 2008, between Noble Holding International Limited, as Issuer, and The Bank of New York Mellon Trust Company, N.A., as Trustee (filed as Exhibit 4.1 to Noble-Cayman’s Current Report on Form 8-K filed on November 21, 2008 and incorporated herein by reference).
4.11	First Supplemental Indenture, dated as of November 21, 2008, among Noble Holding International Limited, as Issuer, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 7.375% Senior Notes due 2014 of Noble Holding International Limited (filed as Exhibit 4.2 to Noble-Cayman’s Current Report on Form 8-K filed on November 21, 2008 and incorporated herein by reference).
4.12	Second Supplemental Indenture, dated as of July 26, 2010, among Noble Holding International Limited, as Issuer, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 3.45% Senior Notes due 2015 of Noble Holding International Limited, 4.90% Senior Notes due 2020 of Noble Holding International Limited, and 6.20% Senior Notes due 2040 of Noble Holding International Limited (filed as Exhibit 4.2 to Noble-Cayman’s Current Report on Form 8-K filed on July 26, 2010 and incorporated herein by reference).
4.13	Third Supplemental Indenture, dated as of February 3, 2011, among Noble Holding International Limited, as Issuer, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 3.05% Senior Notes due 2016 of Noble Holding International Limited, 4.625% Senior Notes due 2021 of Noble Holding International Limited, and 6.05% Senior Notes due 2041 of Noble Holding International Limited (filed as Exhibit 4.2 to Noble-Cayman’s Current Report on Form 8-K filed on February 3, 2011 and incorporated herein by reference).

108

Exhibit Number	Exhibit
4.14	Fourth Supplemental Indenture, dated as of February 10, 2012, among Noble Holding International Limited, as Issuer, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 2.50% Senior Notes due 2017 of Noble Holding International Limited, 3.95% Senior Notes due 2022 of Noble Holding International Limited, and 5.25% Senior Notes due 2042 of Noble Holding International Limited (filed as Exhibit 4.2 to Noble-Cayman’s Current Report on Form 8-K filed on February 13, 2012 and incorporated herein by reference).
4.15	Fifth Supplemental Indenture, dated as of January 31, 2018, among Noble Holding International Limited, as Issuer, Noble-Cayman, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 4.90% Senior Notes due 2020 of Noble Holding International Limited, 4.625% Senior Notes due 2021 of Noble Holding International Limited, and 3.95% Senior Notes due 2022 of Noble Holding International Limited (filed as Exhibit 4.5 to Noble-UK’s Current Report on Form 8-K filed on January 31, 2018 and incorporated herein by reference).
4.16	Revolving Credit Agreement, dated as of January 26, 2015, among Noble-Cayman and Noble International Finance Company, a Cayman Islands company, as borrowers; JPMorgan Chase Bank, N.A., as administrative agent and a swingline lender; Wells Fargo Bank, N.A., as a swingline lender; the lenders party thereto; Barclays Bank PLC, Citibank, N.A., DNB Bank ASA New York Branch, HSBC Bank USA, N.A., SunTrust Bank and Wells Fargo Bank, N.A., as co-syndication agents; BNP Paribas, Credit Suisse AG, Cayman Islands Branch and Mizuho Bank, Ltd, as co-documentation agents; and J.P. Morgan Securities LLC, Barclays Bank PLC, Citigroup Global Markets Inc., DNB Markets, Inc., HSBC Securities (USA) Inc., SunTrust Robinson Humphrey, Inc. and Wells Fargo Securities, LLC, as joint lead arrangers and joint lead bookrunners (filed as Exhibit 4.1 to Noble-UK’s Current Report on Form 8-K filed on January 29, 2015 and incorporated herein by reference).
4.17	First Amendment and Consent to Revolving Credit Agreement and Successor Agent Agreement, dated as of December 19, 2017, among Noble-Cayman and Noble International Finance Company, as borrowers; JPMorgan Chase Bank, N.A., as administrative agent and a swingline lender; Wilmington Trust, National Association, as successor administrative agent; the lenders party thereto; and the other parties party thereto (filed as Exhibit 4.2 to Noble-UK’s Current Report on Form 8-K filed on December 22, 2017 and incorporated herein by reference).
4.18	Indenture, dated as of March 16, 2015, between Noble Holding International Limited, as Issuer, and Wells Fargo Bank, N.A., as Trustee (filed as Exhibit 4.1 to Noble-UK’s Current Report on Form 8-K filed on March 16, 2015 and incorporated herein by reference).
4.19	First Supplemental Indenture, dated as of March 16, 2015, among Noble Holding International Limited, as Issuer, Noble-Cayman, as Guarantor, and Wells Fargo Bank, N.A., as Trustee, relating to 4.000% Senior Notes due 2018 of Noble Holding International Limited, 5.950% Senior Notes due 2025 of Noble Holding International Limited, and 6.950% Senior Notes due 2045 of Noble Holding International Limited (filed as Exhibit 4.2 to Noble-UK’s Current Report on Form 8-K filed on March 16, 2015 and incorporated herein by reference).
4.20	Second Supplemental Indenture, dated as of December 28, 2016, among Noble Holding International Limited, as Issuer, Noble-Cayman, as Guarantor, and Wells Fargo Bank, N.A., as Trustee, relating to 7.750% Senior Notes due 2024 of Noble Holding International Limited (filed as Exhibit 4.1 to Noble-UK’s Current Report on Form 8-K filed on December 28, 2016 and incorporated herein by reference).

109

Exhibit Number	Exhibit
4.21	Revolving Credit Agreement, dated as of December 21, 2017, among Noble Cayman Limited and Noble International Finance Company, as borrowers, Noble Holding UK Limited, as parent guarantor; the subsidiary guarantors from time to time party thereto; JPMorgan Chase Bank, N.A., as administrative agent, a swingline lender, lead arranger and lead bookrunner; Wells Fargo Bank, N.A., as a swingline lender; the lenders party thereto; SunTrust Bank, Wells Fargo Bank, N.A., Citibank, N.A., HSBC Bank USA, N.A., Barclays Bank PLC and DNB Bank ASA New York Branch, as co-syndication agents; and Credit Suisse AG, Cayman Islands Branch and BNP Paribas, as co-documentation agents (filed as Exhibit 4.1 to Noble-UK’s Current Report on Form 8-K filed on December 22, 2017 and incorporated herein by reference).
4.22	Indenture, dated as of January 31, 2018, among Noble Holding International Limited, as Issuer, Noble-Cayman, as Parent Guarantor, the Subsidiary Guarantors (as defined therein) and Wells Fargo Bank, N.A., as Trustee, relating to 7.875% Senior Guaranteed Notes due 2026 of Noble Holding International Limited (filed as Exhibit 4.1 to Noble-UK’s Current Report on Form 8-K filed on January 31, 2018 and incorporated herein by reference).
10.1*	Noble Drilling Corporation Equity Compensation Plan for Non-Employee Directors (filed as Exhibit 4.1 to Noble Drilling Corporation’s Registration Statement on Form S-8 (No. 333-17407) dated December 6, 1996 and incorporated herein by reference)
10.2*	Amendment to the Noble Drilling Corporation Equity Compensation Plan for Non-Employee Directors, effective as of May 1, 2002 (filed as Exhibit 10.1 to Post-Effective Amendment No. 1 to Noble-Cayman’s Registration Statement on Form S-8 (No. 333-17407) and incorporated herein by reference).
10.3*	Amendment No. 2 to the Noble Corporation Equity Compensation Plan for Non-Employee Directors, dated February 4, 2005 (filed as Exhibit 10.20 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).
10.4*	Amendment to the Noble Corporation Equity Compensation Plan for Non-Employee Directors, dated December 31, 2008 (filed as Exhibit 10.29 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2008 and incorporated herein by reference).
10.5*	Amended and Restated Noble Corporation Equity Compensation Plan for Non-Employee Directors, effective March 27, 2009 (filed as Exhibit 10.5 to Noble-Swiss’ Annual Report on Form 10-K for the year ended December 31, 2010 and incorporated herein by reference).
10.6*	Noble Corporation Equity Compensation Plan for Non-Employee Directors, effective as of November 20, 2013 (filed as Exhibit 10.7 to Noble-UK’s Current Report on Form 8-K filed on November 20, 2013 and incorporated herein by reference).
10.7*	Noble Drilling Corporation 401(k) Savings Restoration Plan (filed as Exhibit 10.1 to Noble Drilling Corporation’s Registration Statement on Form S-8 dated January 18, 2001 (No. 333-53912) and incorporated herein by reference)
10.8*	Amendment No. 1 to the Noble Drilling Corporation 401(k) Savings Restoration Plan (filed as Exhibit 10.1 to Post-Effective Amendment No. 1 to Noble-Cayman’s Registration Statement on Form S-8 (No. 333-53912) and incorporated herein by reference).
10.9*	Amendment No. 2 to the Noble Drilling Corporation 401(k) Savings Restoration Plan, dated February 25, 2003 (filed as Exhibit 10.30 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2005 and incorporated herein by reference).

110

Exhibit Number	Exhibit
10.10*	Amendment No. 3 to the Noble Drilling Corporation 401(k) Savings Restoration Plan, dated March 9, 2005 (filed as Exhibit 10.31 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2005 and incorporated herein by reference).
10.11*	Amendment No. 4 to the Noble Drilling Corporation 401(k) Savings Restoration Plan, dated March 30, 2007 (filed as Exhibit 10.41 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2007 and incorporated herein by reference).
10.12*	Amendment No. 5 to the Noble Drilling Corporation 401(k) Savings Restoration Plan, effective May 1, 2010 (filed as Exhibit 10.11 to Noble-Swiss’ Annual Report on Form 10-K for the year ended December 31, 2010 and incorporated herein by reference).
10.13*	Noble Drilling Corporation Retirement Restoration Plan, dated April 27, 1995 (filed as Exhibit 10.2 to Noble Drilling Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 1995 and incorporated herein by reference).
10.14*	Amendment No. 1 to the Noble Drilling Corporation Retirement Restoration Plan, dated January 29, 1998 (filed as Exhibit 10.18 to Noble Drilling Corporation’s Annual Report on Form 10-K for the year ended December 31, 1997 and incorporated herein by reference).
10.15*	Amendment No. 2 to the Noble Drilling Corporation Retirement Restoration Plan dated June 28, 2004, effective as of July 1, 2004 (filed as Exhibit 10.32 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2005 and incorporated herein by reference).
10.16*	Noble Drilling Corporation Retirement Restoration Plan dated December 29, 2008, effective as of January 1, 2009 (filed as Exhibit 10.32 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2008 and incorporated herein by reference).
10.17*	Amendment No. 1 to the Noble Drilling Corporation Retirement Restoration Plan, dated July 10, 2009 (filed as Exhibit 10.16 to Noble-Swiss’ Annual Report on Form 10-K for the year ended December 31, 2010 and incorporated herein by reference).
10.18*	Amended and Restated Noble Corporation 1992 Nonqualified Stock Option and Restricted Share Plan for Non-Employee Directors, dated February 4, 2005 (filed as Exhibit 10.21 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).
10.19*	Second Amended and Restated Noble Corporation 1992 Nonqualified Stock Option and Share Plan for Non-Employee Directors, dated as of October 25, 2007 (filed as Exhibit 10.2 to Noble-Cayman’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2007 and incorporated herein by reference).
10.20*	Amendment to the Second Amended and Restated Noble Corporation 1992 Nonqualified Stock Option and Share Plan for Non-Employee Directors, dated December 31, 2008 (filed as Exhibit 10.28 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2008 and incorporated herein by reference).
10.21*	Third Amended and Restated Noble Corporation 1992 Nonqualified Stock Option and Share Plan for Non-Employee Directors, effective March 27, 2009 (filed as Exhibit 10.20 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2010 and incorporated herein by reference).
10.22*	Fourth Amended and Restated Noble Corporation 1992 Nonqualified Stock Option and Share Plan for Non-Employee Directors, effective February 1, 2013 (filed as Exhibit 10.1 to Noble-Swiss’ Current Report on Form 8-K filed on February 5, 2013 and incorporated herein by reference).

111

Exhibit Number	Exhibit
10.23*	Fifth Amended and Restated Noble Corporation 1992 Nonqualified Stock Option and Share Plan for Non-Employee Directors, effective as of November 20, 2013 (filed as Exhibit 10.6 to Noble-UK’s Current Report on Form 8-K filed on November 20, 2013 and incorporated herein by reference).
10.24*	Sixth Amended and Restated Noble Corporation 1992 Nonqualified Stock Option and Share Plan for Non-Employee Directors, effective as of January 30, 2014 (filed as Exhibit 10.24 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference).
10.25*	Composite Copy of the Noble Corporation 1991 Stock Option and Restricted Stock Plan, dated as of February 6, 2010 (filed as Exhibit 10.18 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2009 and incorporated herein by reference).
10.26*	Third Amendment to the Noble Corporation 1991 Stock Option and Restricted Stock Plan, effective as of February 3, 2012 (filed as Exhibit 10.2 to Noble-Swiss’ Current Report on Form 8-K filed on February 7, 2012 and incorporated herein by reference).
10.27*	Amended and Restated Noble Corporation 1991 Stock Option and Restricted Stock Plan, effective as of April 27, 2012 (filed as Exhibit 10.2 to Noble-Swiss’ Current Report on Form 8-K filed on April 30, 2012 and incorporated herein by reference).
10.28*	Noble Corporation 1991 Stock Option and Restricted Stock Plan, effective as of November 20, 2013 (filed as Exhibit 10.5 to Noble-UK’s Current Report on Form 8-K filed on November 20, 2013 and incorporated herein by reference).
10.29*	Noble Corporation 1991 Stock Option and Restricted Stock Plan, effective as of January 30, 2014 (filed as Exhibit 10.29 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference).
10.30*	Noble Drilling Corporation 2009 401(k) Savings Restoration Plan, effective January 1, 2009 (filed as Exhibit 10.31 to Noble-Cayman’s Annual Report on Form 10-K for the year ended December 31, 2008 and incorporated herein by reference).
10.31*	Amendment No. 1 to the Noble Drilling Corporation 2009 401(k) Savings Restoration Plan, effective May 1, 2010 (filed as Exhibit 10.23 to Noble-Swiss’ Annual Report on Form 10-K for the year ended December 31, 2010 and incorporated herein by reference).
10.32*	Amendment No. 2 to the Noble Drilling Corporation 2009 401(k) Savings Restoration Plan, effective November 1, 2013 (filed as Exhibit 10.32 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference).
10.33*	Noble Corporation Summary of Directors’ Compensation.
10.34*	Form of Noble Corporation Performance-Vested Restricted Stock Unit Agreement under the Noble Corporation 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.2 to Noble-Cayman’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2011 and incorporated herein by reference).

112

Exhibit Number	Exhibit
10.35*	Form of Noble Corporation Time-Vested Restricted Stock Unit Agreement under the Noble Corporation 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.2 to Noble-Swiss’ Current Report on Form 8-K filed on January 13, 2012 and incorporated herein by reference).
10.36*	Form of Noble Corporation Nonqualified Stock Option Agreement under the Noble Corporation 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.3 to Noble-Swiss’ Current Report on Form 8-K filed on January 13, 2012 and incorporated herein by reference).
10.37*	Form of Noble Corporation Performance-Vested Restricted Stock Unit Agreement under the Noble Corporation 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.7 to Noble-Cayman’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2012 and incorporated herein by reference).
10.38*	Form of Noble Corporation Performance-Vested Restricted Stock Unit Agreement under the Noble Corporation 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.39 to Noble-Swiss’ Annual Report on Form 10-K for the year ended December 31, 2012 and incorporated herein by reference).
10.39*	Form of Noble Corporation Performance-Vested Restricted Stock Unit Award under the Noble Corporation 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.39 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference).
10.40*	Form of Noble Corporation Time-Vested Restricted Stock Unit Award under the Noble Corporation 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.40 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference).
10.41*	Amended and Restated Form of Noble-UK 2013 Performance-Vested Restricted Stock Unit Award under the Noble-UK 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.1 to Noble-UK’s Current Report on Form 8-K for the year filed on October 16, 2014 and incorporated herein by reference).
10.42*	Amended and Restated Form of Noble-UK 2014 Performance-Vested Restricted Stock Unit Award under the Noble-UK 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.2 to Noble-UK’s Current Report on Form 8-K for the year filed on October 16, 2014 and incorporated herein by reference).
10.43*	Noble Corporation 2015 Omnibus Incentive Plan, effective May 1, 2015 and most recently restated as of May 1, 2017 (filed as Exhibit 10.1 to Noble-UK’s Current Report on Form 8-K filed on May 2, 2017 and incorporated herein by reference).
10.44*	Noble Corporation plc 2017 Director Omnibus Plan, effective as of May 1, 2017 (filed as Exhibit 10.2 to Noble-UK’s Current Report on Form 8-K filed on May 2, 2017 and incorporated herein by reference).
10.45*	Form of Noble Corporation Time-Vested Restricted Stock Unit Award under the Noble Corporation 2015 Omnibus Incentive Plan (filed as Exhibit 10.44 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2015 and incorporated herein by reference).
10.46*	Form of Noble Corporation Performance-Vested Restricted Stock Unit Award under the Noble Corporation 2015 Omnibus Incentive Plan (filed as Exhibit 10.45 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2015 and incorporated herein by reference).
10.47*	Noble Corporation 2012 Short Term Incentive Plan (filed as Exhibit 10.6 to Noble-Cayman’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2012 and incorporated herein by reference).

113

Exhibit Number	Exhibit
10.48*	Noble Corporation 2013 Short Term Incentive Plan (filed as Exhibit 10.41 to Noble-Swiss’ Annual Report on Form 10-K for the year ended December 31, 2012 and incorporated herein by reference).
10.49*	Noble Corporation 2013 Short Term Incentive Plan, effective as of November 20, 2013 (filed as Exhibit 10.8 to Noble-UK’s Current Report on Form 8-K filed on November 20, 2013 and incorporated herein by reference).
10.50*	Noble Corporation 2014 Short-Term Incentive Plan (filed as Exhibit 10.5 to Noble-UK’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 and incorporated herein by reference).
10.51*	Noble Corporation 2015 Short-Term Incentive Plan (filed as Exhibit 10.5 to Noble-UK’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 and incorporated herein by reference).
10.52*	Noble Corporation 2016 Short-Term Incentive Plan (filed as Exhibit 10.51 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2015 and incorporated herein by reference).
10.53*	Noble Corporation 2017 Short-Term Incentive Plan (filed as Exhibit 10.52 to Noble-UK’s Annual Report on Form 10-K for the year ended December 31, 2016 and incorporated herein by reference).
10.55*	Form of Restated Employment Agreement and Guaranty Agreement (2009 Form) (filed as Exhibit 10.2 to Noble-UK’s Current Report on Form 8-K filed on November 20, 2013 and incorporated herein by reference).
10.56*	Form of Restated Employment Agreement and Guaranty Agreement (2011 Form) (filed as Exhibit 10.3 to Noble-UK’s Current Report on Form 8-K filed on November 20, 2013 and incorporated herein by reference).
10.57*	Form of Restated Employment Agreement and Guaranty Agreement (2012 Form) (filed as Exhibit 10.4 to Noble-UK’s Current Report on Form 8-K filed on November 20, 2013 and incorporated herein by reference).
10.58*	Form of Commercial Paper Dealer Agreement dated as of September 19, 2012 between Noble Corporation, a Cayman Islands company, Noble Holding International Limited, a Cayman Islands company, Noble Drilling Corporation, a Delaware corporation, and certain investment banks (filed as Exhibit 10.1 to Noble-Swiss’ Current Report on Form 8-K filed on September 20, 2012 and incorporated herein by reference).
10.59*	Form of Commercial Paper Issuing and Paying Agent Agreement dated as of September 19, 2012 between Noble Corporation, a Cayman Islands company, and the Issuing and Paying Agent (filed as Exhibit 10.2 to Noble-Swiss’ Current Report on Form 8-K filed on September 20, 2012 and incorporated herein by reference).
10.60*	Form of Indemnity Agreement (filed as Exhibit 10.1 to Noble-UK’s Current Report on Form 8-K filed on November 20, 2013 and incorporated herein by reference).
10.61*	General Release Agreement and Special Release Agreement, each dated February 27, 2016, between Noble Drilling Services Inc. and James MacLennan (filed as Exhibit 10.5 to Noble-UK's Quarterly Report on Form 10-Q for the quarter ended March 31, 2016 and incorporated herein by reference).
10.62	Settlement and Termination Agreement, dated as of May 10, 2016, by and among Freeport-McMoRan Inc., Freeport-McMoRan Oil & Gas, LLC and Noble Drilling (U.S.) LLC (filed as Exhibit 10.1 to Noble-UK’s Current Report on Form 8-K filed on May 10, 2016 and incorporated herein by reference).
10.63	Termination Letter, dated April 21, 2017, by and between Paragon Offshore plc and Noble-UK (filed as Exhibit 10.12 to Noble-UK’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 and incorporated herein by reference).

114

Exhibit Number	Exhibit
10.64*	Separation Agreement, effective on January 11, 2018, between David W. Williams, Noble-UK and Noble Drilling Services Inc. (filed as Exhibit 10.1 to Noble-UK’s Current Report on Form 8-K filed on January 12, 2018 and incorporated herein by reference).
10.65*	Inducement Agreement, effective on January 11, 2018, by and among Julie J. Robertson, Noble-UK and Noble Drilling Services Inc. (filed as Exhibit 10.2 to Noble-UK’s Current Report on Form 8-K filed on January 12, 2018 and incorporated herein by reference).
10.66*	Restated Employment Agreement by and between Julie J. Robertson and Noble Drilling Services Inc., executed as of February 21, 2018.
21.1	Subsidiaries of Noble-UK and Noble-Cayman.
23.1	Consent of PricewaterhouseCoopers LLP.
23.2	Consent of PricewaterhouseCoopers LLP.
31.1	Certification of Julie J. Robertson pursuant to the U.S. Securities Exchange Act of 1934, as amended (“Exchange Act”), Rule 13a-14(a) or Rule 15d-14(a).
31.2	Certification of Adam C. Peakes pursuant to Exchange Act Rule 13a-14(a) or Rule 15d-14(a).
31.3	Certification of Thomas B Sloan Jr. pursuant to Exchange Act Rule 13a- 14(a) or Rule 15d-14(a).
32.1+	Certification of Julie J. Robertson pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2+	Certification of Adam C. Peakes pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.3+	Certification of Thomas B Sloan Jr. pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	Interactive Data File

______________________________________________________

* Management contract or compensatory plan or arrangement.

+ Furnished in accordance with Item 601(b)(32)(ii) of Regulation S-K.

115

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Noble Corporation plc,a company registered under the laws of England and Wales

February 23, 2018	By:	/s/ Julie J. Robertson
		Julie J. Robertson Chairman, President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

/s/ Julie J. Robertson	February 23, 2018
Julie J. Robertson Chairman, President and Chief Executive Officer (Principal Executive Officer)	Date
/s/ Adam C. Peakes	February 23, 2018
Adam C. Peakes Senior Vice President and Chief Financial Officer (Principal Financial Officer)	Date
/s/ Thomas B Sloan Jr.	February 23, 2018
Thomas B Sloan Jr. Vice President and Controller (Principal Accounting Officer)	Date
/s/ Ashley Almanza	February 23, 2018
Ashley Almanza Director	Date
/s/ Julie H. Edwards	February 23, 2018
Julie H. Edwards Director	Date
/s/ Gordon T. Hall	February 23, 2018
Gordon T. Hall Director	Date
/s/ Scott D. Josey	February 23, 2018
Scott D. Josey Director	Date

116

/s/ Jon A. Marshall	February 23, 2018
Jon A. Marshall Director	Date
/s/ Mary P. Ricciardello	February 23, 2018
Mary P. Ricciardello Director	Date

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Noble Corporation, a Cayman Islands company

February 23, 2018	By:	/s/ Julie J. Robertson
		Julie J. Robertson President and Chief Executive Officer

/s/ Julie J. Robertson	February 23, 2018
Julie J. Robertson President and Chief Executive Officer (Principal Executive Officer)	Date
/s/ Thomas B Sloan Jr.	February 23, 2018
Thomas B Sloan Jr. Vice President and Chief Financial Officer (Principal Financial and Accounting Officer)	Date
/s/ David M.J. Dujacquier	February 23, 2018
David M.J. Dujacquier Director	Date
/s/ Alan R. Hay	February 23, 2018
Alan R. Hay Director	Date

117

EX-10.33

Exhibit 10.33

Noble Corporation

Summary of Director Compensation

Annual Retainer. Noble Corporation plc, a company organized under the laws of England and Wales, (the “Company”) pays each of its non-employee directors an annual retainer of $50,000. Under the Noble Corporation plc 2017 Director Omnibus Plan (the “Director Plan”), non-employee directors may elect to receive up to all of the retainer in shares. The number of shares to be issued under the plan in any particular quarter is generally determined using the average of the high and low trading price on the date of grant.

Board Meeting Fees. In addition, the Company pays its non-employee directors a Board meeting fee of $2,000. The Company pays each member of its committees a committee meeting fee of $2,000 per meeting. The Company also reimburses directors for travel, lodging and related expenses they may incur in attending Board and committee meetings, and related activities in connection with the duties as director.

Committee Fees. The chair of the audit committee and the compensation committee receives an annual retainer of $20,000, and the chair of each other standing Board committee receives an annual retainer of $10,000. The lead director also receives an annual fee of $22,500.

Equity Compensation. Under the Director Plan, each annually-determined award of a variable number of restricted shares or share units is made on a date selected by the Board, or if no such date is selected by the Board, the date on which the Board action approving such award is taken. The compensation committee has adopted a policy providing that all equity awards to directors under the Director Plan (other than shares issued to pay the quarterly retainer discussed above) will include a one-year vesting period. Any future award of restricted shares or units will be evidenced by a written agreement that will include such terms and conditions not inconsistent with the terms and conditions of the Director Plan as the Board considers appropriate in each case.

EX-10.66

Exhibit 10.66

RESTATED EMPLOYMENT AGREEMENT

by and between

NOBLE DRILLING SERVICES INC.

and

JULIE J. ROBERTSON

EFFECTIVE JANUARY 11, 2018

Exhibit 10.66

			RESTATED EMPLOYMENT AGREEMENT
			TABLE OF CONTENTS
				Page
1			Employment	1
			2.     Employment Term 2
			Term	2
	(a)		Relationship Prior to Effective Date	2
3	(b)		Positions and Duties	2
4			Compensation and Related Matters	3
			Base Salary	3
	(a)		Annual Bonus	4
	(b)		Employee Benefits.	4
	(c)	(i)	Incentive, Savings and Retirement Plans	4
	(i)	(ii)	Welfare Benefit Plans	4
	(ii)		Expenses	5
	(d)		Fringe Benefits	5
	(e)		Vacation	5
	(f)		Termination of Employment.	5
5			Death	5
	(a)		Disability	5
	(b)		Termination by Company	6
	(c)		Termination by Executive	6
	(d)		Notice of Termination	7
	(e)		Date of Termination	7
	(f)		Obligations of the Company upon Separation from Service	8
6			Good Reason or During the Window Period; Other Than for Cause, Death or Disability	8
	(a)		Death	10
	(b)		Disability	10
	(c)		Cause; Other than for Good Reason or During the Window Period	11
	(d)		Payment Delay for Specified Employee	11
	(e)		Certain Additional Payments by the Company	12
7			Representations and Warranties	14
8			Confidential Information	15
9			Certain Definitions	15
10	(a)		Effective Date	15
	(b)		Change of Control Period	15
	(c)		Change of Control	15
	(d)		Separation from Service	18
	(e)		Specified Employee	18

Exhibit 10.66

	(f)	Separation Date	18
11		Full Settlement	18
12		No Effect on Other Contractual Rights	19
13		Indemnification; Directors and Officers Insurance	19
14		Injunctive Relief	19
15		Governing Law	20
16		Notices	20
17		Binding Effect; Assignment; No Third Party Benefit	20
18		Miscellaneous	21
	(a)	Amendment	21
	(b)	Waiver	21
	(c)	Withholding Taxes	21
	(d)	Nonalienation of Benefits	21
	(e)	Severability	21
	(f)	Entire Agreement	21
	(g)	Captions	21
	(h)	References	22

Exhibit 10.66

RESTATED EMPLOYMENT AGREEMENT

This RESTATED EMPLOYMENT AGREEMENT (this “Agreement”), is made as of February 21, 2018 and effective as of January 11, 2018, by and between Noble Drilling Services Inc., a Delaware corporation (the “Company”), and Julie J. Robertson (the “Executive”);

WITNESSETH:

WHEREAS, the Company and the Executive have previously entered into a form of this Agreement (the “2013 Agreement”); and

WHEREAS, the Board of Directors of the Company (the “Board”) has determined that it is in the best interests of the Company, its parent, Noble Corporation plc, a public limited company formed under the laws of England and Wales (“Noble-London”), and each other affiliated company (as defined in Paragraph 1 below), to assure that the group will have the continued dedication of the Executive, notwithstanding the possibility, threat or occurrence of a Change of Control (as defined in Paragraph 10 below); and

WHEREAS, the Board believes it is imperative to diminish the inevitable distraction of the Executive by virtue of the personal uncertainties and risks created by a pending or threatened Change of Control and to encourage the Executive’s full attention and dedication to the Company and/or its affiliated companies currently and in the event of any pending or threatened Change of Control, and to provide the Executive with compensation and benefits upon a Change of Control which ensure that the compensation and benefits expectations of the Executive will be satisfied and which are competitive with those of other corporations; and

WHEREAS, effective as of January 11, 2018, the Executive was named Chairman of the Board of Directors, President and Chief Executive Officer of Noble-London (the “Appointment”); and

WHEREAS, in connection with the Appointment, (i) the Executive, Noble-London and the Company entered into that certain Inducement Agreement, effective as of January 11, 2018 (the “Inducement Agreement”) and (ii) the Executive and the Company wish to restate the 2013 Agreement to make certain technical and clarifying changes; and

WHEREAS, Noble-London has guaranteed performance by the Company of the Company’s obligations pursuant to the 2013 Agreement and will guarantee the Company’s obligations under this Agreement;

NOW, THEREFORE, in consideration of the premises and the mutual covenants and agreements herein contained, and intending to be legally bound hereby, the Company and the Executive hereby restate the 2013 Agreement as follows:

1.Employment. The Company agrees that the Company or an affiliated company will employ the Executive, and the Executive agrees to be employed by the Company or an affiliated company, for the period set forth in Paragraph 2(a), in the positions and with the duties and responsibilities set forth in Paragraph 3, and upon the other terms and conditions herein provided. As used in this Agreement, the term “affiliated company” shall mean any incorporated or unincorporated trade or business or other entity or person, other than the Company, that along with the Company is considered a single employer under Section 414(b) or 414(c) of the U.S. Internal Revenue Code of 1986, as amended (the “Code”); provided, however, that (i) in applying Section 1563(a)(1), (2), and (3) of the Code for the purposes of determining a controlled group of corporations under Section 414(b) of the Code, the phrase “at least 50 percent” shall be used instead of the

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Exhibit 10.66

phrase “at least 80 percent” in each place the phrase “at least 80 percent” appears in Section 1563(a)(1), (2), and (3) of the Code, and (ii) in applying Treas. Reg. section 1.414(c)-2 for the purposes of determining trades or businesses (whether or not incorporated) that are under common control for the purposes of Section 414(c) of the Code, the phrase “at least 50 percent” shall be used instead of the phrase “at least 80 percent” in each place the phrase “at least 80 percent” appears in Treas. Reg. section 1.414(c)-2.

2.Employment Term.

(a)Term. The employment of the Executive by the Company or an affiliated company as provided in Paragraph 1 shall be for the period commencing on the Effective Date (as defined in Paragraph 10 below) through and ending on the third anniversary of such date (the “Employment Term”).

(b)Relationship Prior to Effective Date. The Executive and the Company acknowledge that, except as may otherwise be provided under any written agreement between the Executive and the Company other than this Agreement, the employment of the Executive by the Company is “at will” and, prior to the Effective Date, may be terminated by either the Executive or the Company at any time. Moreover, if prior to the Effective Date, the Executive’s employment with the Company terminates, then the Executive shall have no further rights under this Agreement. For purposes of this Paragraph 2(b) only, the term “Company” shall mean and include the company that employs Executive, whether Noble Drilling Services Inc. or an affiliated company of Noble Drilling Services Inc.

3.Positions and Duties.

(a)    During the Employment Term, the Executive’s position (including status, offices, titles and reporting requirements), duties, functions, responsibilities and authority shall be at least commensurate in all material respects with the most significant of those held or exercised by or assigned to the Executive in respect of the Company or any affiliated company at any time during the 120-day period immediately preceding the Effective Date, except that this Paragraph 3(a) shall not require that the Executive retain the positions of Chairman of the Board of Directors or President of Noble-London so long as the Executive retains the position of Chief Executive Officer of Noble-London.

(b)    During the Employment Term, the Executive shall devote the Executive’s full time, skill and attention, and the Executive’s reasonable best efforts, during normal business hours to the business and affairs of the Company, and in furtherance of the business and affairs of its affiliated companies, to the extent necessary to discharge faithfully and efficiently the duties and responsibilities delegated and assigned to the Executive herein or pursuant hereto, except for usual, ordinary and customary periods of vacation and absence due to illness or other disability; provided, however, that the Executive may (i) serve on industry-related, civic or charitable boards or committees, (ii) with the approval of the Board of Directors of Noble-London (the “Noble-London Board”), serve on corporate boards or committees, (iii) deliver lectures, fulfill speaking engagements or teach at educational institutions, and (iv) manage the Executive’s personal investments, so long as such activities do not significantly interfere with the performance and fulfillment of the Executive’s duties and responsibilities as an employee of the Company or an affiliated company in accordance with this Agreement and, in the case of the activities described in clause (ii) of this proviso, will not, in the good faith judgment of the Noble-London Board, constitute an actual or potential conflict of interest with the business of the Company or an affiliated company. It is expressly understood and agreed that, to the extent that any such activities have been conducted by the Executive during the term of the Executive’s employment by the Company or its affiliated companies prior to the Effective Date consistent with the provisions of this Paragraph 3(b), the continued conduct of such activities (or of activities similar in nature and scope thereto) subsequent to the Effective Date shall not thereafter be deemed to interfere with

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Exhibit 10.66

the performance and fulfillment of the Executive’s duties and responsibilities to the Company and its affiliated companies.

(c)    In connection with the Executive’s employment hereunder, the Executive shall be based at the location where the Executive was regularly employed immediately prior to the Effective Date or any office which is the headquarters of the Company or Noble-London and is less than 50 miles from such location, subject, however, to required travel on the business of the Company and its affiliated companies to an extent substantially consistent with the Executive’s business travel obligations during the three-year period immediately preceding the Effective Date.

(d)    All services that the Executive may render to the Company or any of its affiliated companies in any capacity during the Employment Term shall be deemed to be services required by this Agreement and consideration for the compensation provided for herein.

4.Compensation and Related Matters.

(a)Base Salary. During the Employment Term, the Executive shall receive an annual base salary (“Base Salary”) at least equal to 12 times the highest monthly base salary paid or payable, including any base salary that has been earned but deferred, to the Executive by the Company and its affiliated companies in respect of the 12-month period immediately preceding the month in which the Effective Date occurs. The Base Salary shall be payable in installments in accordance with the general payroll practices of the Company in effect at the time such payment is made, but in no event less frequently than monthly, or as otherwise mutually agreed upon. During the Employment Term, the Executive’s Base Salary shall be subject to such increases (but not decreases) as may be determined from time to time by the Noble-London Board in its sole discretion; provided, however, that the Executive’s Base Salary (i) shall be reviewed by the Noble-London Board no later than 12 months after the last salary increase awarded to the Executive prior to the Effective Date and thereafter at least annually, with a view to making such upward adjustment, if any, as the Noble-London Board deems appropriate, and (ii) shall be increased at any time and from time to time as shall be substantially consistent with increases in base salary generally awarded in the ordinary course of business to the Executive’s peer executives of the Company or any of its affiliated companies. Base Salary shall not be reduced after any such increase. The term Base Salary as used in this Agreement shall refer to the Base Salary as so increased. Payments of Base Salary to the Executive shall not be deemed exclusive and shall not prevent the Executive from participating in any employee benefit plans, programs or arrangements of the Company and its affiliated companies in which the Executive is entitled to participate. Payments of Base Salary to the Executive shall not in any way limit or reduce any other obligation of the Company hereunder, and no other compensation, benefit or payment to the Executive hereunder shall in any way limit or reduce the obligation of the Company regarding the Executive’s Base Salary hereunder.

(b)Annual Bonus.  In addition to Base Salary, the Executive shall be awarded, in respect of each fiscal year of the Company ending during the Employment Term, an annual bonus (the “Annual Bonus”) in cash in an amount at least equal to the Executive’s highest aggregate bonus under all Company and affiliated company bonus plans, programs, arrangements and awards (including the Company’s Short-Term Incentive Plan and any successor plan) in respect of any fiscal year in the three full fiscal year period ended immediately prior to the Effective Date (annualized for any fiscal year consisting of less than 12 full months or with respect to which the Executive has been employed by the Company or any of its affiliated companies for less than 12 full months) (such highest amount is hereinafter referred to as the “Recent Annual Bonus”). Each such Annual Bonus shall be paid no later than the end of the third month of the fiscal year next following the fiscal year in respect of which the Annual Bonus is awarded, unless the Executive shall elect to defer the receipt of such Annual Bonus.

3

Exhibit 10.66

(c)Employee Benefits.

(i)Incentive, Savings and Retirement Plans. During the Employment Term, the Executive shall be entitled to participate in all incentive, savings and retirement plans, programs and arrangements applicable generally to the Executive’s peer executives of the Company and its affiliated companies, but in no event shall such plans, programs and arrangements provide the Executive with incentive opportunities (measured with respect to both regular and special incentive opportunities, to the extent, if any, that such distinction is applicable), savings opportunities and retirement benefit opportunities, in each case, less favorable, in the aggregate, than the most favorable of those provided by the Company and its affiliated companies for the Executive under such plans, programs and arrangements as in effect at any time during the 120-day period immediately preceding the Effective Date or, if more favorable to the Executive, those provided generally at any time after the Effective Date to the Executive’s peer executives of the Company and its affiliated companies.

(ii)Welfare Benefit Plans. During the Employment Term, the Executive and/or the Executive’s family, as the case may be, shall be eligible to participate in and shall receive all benefits under all welfare benefit plans, programs and arrangements provided by the Company and its affiliated companies (including, without limitation, medical, prescription, dental, disability, employee life, group life, accidental death and travel accident insurance plans, programs and arrangements) to the extent applicable generally to the Executive’s peer executives of the Company and its affiliated companies, but in no event shall such plans, programs and arrangements provide the Executive with welfare benefits that are less favorable, in the aggregate, than the most favorable of such plans, programs and arrangements as in effect for the Executive at any time during the 120-day period immediately preceding the Effective Date or, if more favorable to the Executive, those provided generally at any time after the Effective Date to the Executive’s peer executives of the Company and its affiliated companies.

(d)Expenses. During the Employment Term, the Executive shall be entitled to receive prompt reimbursement for all reasonable expenses incurred by the Executive in performing the Executive’s duties and responsibilities hereunder in accordance with the most favorable policies, practices and procedures of the Company and its affiliated companies as in effect for the Executive at any time during the 120-day period immediately preceding the Effective Date or, if more favorable to the Executive, as in effect generally at any time thereafter with respect to the Executive’s peer executives of the Company and its affiliated companies.

(e)Fringe Benefits. During the Employment Term, the Executive shall be entitled to fringe benefits, including, without limitation, tax and financial planning services, payment of club dues and, if applicable, use of an automobile and payment of related expenses, in accordance with the most favorable policies, practices and procedures of the Company and its affiliated companies as in effect for the Executive at any time during the 120-day period immediately preceding the Effective Date or, if more favorable to the Executive, as in effect generally at any time after the Effective Date with respect to the Executive’s peer executives of the Company and its affiliated companies.

(f)Vacation. During the Employment Term, the Executive shall be entitled to paid vacation and such other paid absences, whether for holidays, illness, personal time or any similar purposes, in accordance with the most favorable policies, practices and procedures of the Company and its affiliated companies as in effect for the Executive at any time during the 120-day period immediately preceding the Effective Date or, if more favorable to the Executive, as in effect generally at any time after the Effective Date with respect to the Executive’s peer executives of the Company and its affiliated companies.

4

Exhibit 10.66

5.Termination of Employment.

(a)Death. The Executive’s employment shall terminate automatically upon the Executive’s death during the Employment Term.

(b)Disability. If the Company determines in good faith that the Disability (as defined below) of the Executive has occurred during the Employment Term, the Company may give the Executive notice of its intention to terminate the Executive’s employment. In such event, the Executive’s employment hereunder shall terminate effective on the 30th day after receipt of such notice by the Executive (the “Disability Effective Date”); provided, that within the 30-day period after such receipt, the Executive shall not have returned to full-time performance of the Executive’s duties. For purposes of this Agreement, “Disability” shall mean the absence of the Executive from the Executive’s duties hereunder on a full-time basis for an aggregate of 180 days within any given period of 270 consecutive days (in addition to any statutorily required leave of absence and any leave of absence approved by the Company) as a result of incapacity of the Executive, despite any reasonable accommodation required by law, due to bodily injury or disease or any other mental or physical illness, which will, in the opinion of a physician selected by the Company or its insurers and acceptable to the Executive or the Executive’s legal representative, be permanent and continuous during the remainder of the Executive’s life.

(c)Termination by Company. The Company may terminate the Executive’s employment hereunder for Cause (as defined below). For purposes of this Agreement, “Cause” shall mean:

(i)    the willful and continued failure of the Executive to perform substantially the Executive’s duties hereunder (other than any such failure resulting from bodily injury or disease or any other incapacity due to mental or physical illness) after a written demand for substantial performance is delivered to the Executive by the Board or the Noble-London Board, which specifically identifies the manner in which the Board or the Noble-London Board believes the Executive has not substantially performed the Executive’s duties; or

(ii)    the willful engaging by the Executive in illegal conduct or gross misconduct that is materially and demonstrably detrimental to the Company and/or its affiliated companies, monetarily or otherwise.

For purposes of this provision, no act, or failure to act, on the part of the Executive shall be considered “willful” unless done, or omitted to be done, by the Executive in bad faith or without reasonable belief that the Executive’s action or omission was in the best interests of Noble-London. Any act, or failure to act, based upon authority given pursuant to a resolution duly adopted by the Board or the Noble-London Board or based upon the advice of counsel for the Company shall be conclusively presumed to be done, or omitted to be done, by the Executive in good faith and in the best interests of the Company and its affiliated companies. The cessation of employment of the Executive shall not be deemed to be for Cause unless and until there shall have been delivered to the Executive a copy of a resolution duly adopted by the affirmative vote of not less than two-thirds of the entire membership of the Noble-London Board then in office at a meeting of the Noble-London Board called and held for such purpose (after reasonable notice is provided to the Executive and the Executive is given an opportunity, together with counsel, to be heard before the Noble-London Board) finding that, in the good faith opinion of the Noble-London Board, the Executive is guilty of the conduct described in subparagraph (i) or (ii) above, and specifying the particulars thereof in detail.

(d)Termination by Executive. The Executive may terminate the Executive’s employment hereunder (i) at any time during the Employment Term for Good Reason (as defined below), or (ii) during the Window Period (as defined below) without any reason. For purposes of this Agreement,

5

Exhibit 10.66

the “Window Period” shall mean the 30-day period immediately following the first anniversary of the Effective Date, and “Good Reason” shall mean any of the following (without the Executive’s express written consent):

(i)    a material diminution in the Executive’s position (including status, offices, titles and reporting requirements), duties, functions, responsibilities or authority as contemplated by Paragraph 3(a) of this Agreement;

(ii)    a material failure by the Company to comply with the provisions of Paragraph 4 of this Agreement;

(iii)    the Company’s requiring the Executive to be based at any office or location other than as provided in Paragraph 3(c) of this Agreement, or the Company’s requiring the Executive to travel on the Company’s or its affiliated companies’ business to a substantially greater extent than during the three-year period immediately preceding the Effective Date;

(iv)    any failure by the Company to comply with and satisfy Paragraph 17(c) of this Agreement; or

(v)    any other action or inaction that constitutes a material breach by the Company of the provisions of this Agreement.

Notwithstanding the foregoing, the Executive shall not have the right to terminate the Executive’s employment hereunder for Good Reason unless (i) within 60 days of the initial existence of the condition or conditions giving rise to such right the Executive provides written notice to the Company of the existence of such condition or conditions, and (ii) the Company fails to remedy such condition or conditions within 30 days following the receipt of such written notice. If any such condition is not remedied within such 30-day period, the Executive may provide a Notice of Termination for Good Reason in accordance with the provisions of Paragraph 5(e). In no event shall Good Reason arise hereunder (or pursuant to any other agreement with the Executive, including the Inducement Agreement) upon a termination of the Executive’s role as Chairman of the Board of Directors and/or President of Noble-London so long as Executive retains the role of Chief Executive Officer of Noble-London.

(e)Notice of Termination. Any termination of the Executive’s employment hereunder by the Company or by the Executive (other than a termination pursuant to Paragraph 5(a)) shall be communicated by a Notice of Termination (as defined below) to the other party hereto. For purposes of this Agreement, a “Notice of Termination” shall mean a notice which (i) indicates the specific termination provision in this Agreement relied upon, (ii) in the case of a termination for Disability, Cause or Good Reason, sets forth in reasonable detail the facts and circumstances claimed to provide a basis for termination of the Executive’s employment under the provision so indicated, and (iii) specifies the Date of Termination (as defined in Paragraph 5(f) below); provided, however, that notwithstanding any provision in this Agreement to the contrary, a Notice of Termination given in connection with a termination for Good Reason shall be given by the Executive within a reasonable period of time, not to exceed 150 days, following the initial existence of one or more of the conditions giving rise to such right of termination. The failure by the Company or the Executive to set forth in the Notice of Termination any fact or circumstance which contributes to a showing of Disability, Cause or Good Reason shall not waive any right of the Company or the Executive hereunder or preclude the Company or the Executive from asserting such fact or circumstance in enforcing the Company’s or the Executive’s rights hereunder.

6

Exhibit 10.66

(f)Date of Termination. For purposes of this Agreement, the “Date of Termination” shall mean the effective date of the termination of the Executive’s employment hereunder, which date shall be (i) if the Executive’s employment is terminated by the Executive’s death, the date of the Executive’s death, (ii) if the Executive’s employment is terminated because of the Executive’s Disability, the Disability Effective Date, (iii) if the Executive’s employment is terminated by the Company (or applicable affiliated company) for Cause or by the Executive for Good Reason, the date on which the Notice of Termination is given, (iv) if the Executive’s employment is terminated pursuant to Paragraph 2(a), the date on which the Employment Term ends pursuant to Paragraph 2(a) due to a party’s delivery of a Notice of Termination thereunder, and (v) if the Executive’s employment is terminated for any other reason, the date specified in the Notice of Termination, which date shall in no event be earlier than the date such notice is given.

6.Obligations of the Company upon Separation from Service.

(a)Good Reason or During the Window Period; Other Than for Cause, Death or Disability. Subject to the provisions of Paragraph 6(e) of this Agreement, if prior to the end of the Employment Term the Executive’s Separation from Service (as defined in Paragraph 10 below) shall occur (i) by reason of the Company’s termination of the Executive’s employment hereunder other than for Cause or Disability, or (ii) by reason of the Executive’s termination of the Executive’s employment hereunder either for Good Reason or without any reason during the Window Period, the Company shall pay to the Executive when due under the Company’s normal payroll practices the Executive’s Base Salary through the Separation Date (as defined in Paragraph 10 below) to the extent not theretofore paid, and:

(i)    the Company shall pay to the Executive within 30 days after the Executive’s Separation Date a lump sum payment in cash equal to the sum of the following amounts:

(A)    the sum of (1) the product of (x) the greater of (I) the Recent Annual Bonus and (II) the Annual Bonus paid or payable, including by reason of any deferral, to the Executive (and annualized for any fiscal year consisting of less than 12 full months or for which the Executive has been employed by the Company or any of its affiliated companies for less than 12 full months) in respect of the most recently completed fiscal year of the Company during the Employment Term, if any; provided that, in any case, the minimum amount determinable under this clause (II) shall be an amount equal to the bonus that would have been payable to the Executive under the Company’s Short-Term Incentive Plan and any successor plan for the most recently ended full fiscal year period immediately prior to the Effective Date assuming the Executive had been eligible to receive a bonus thereunder for such period (such greater amount hereinafter referred to as the “Highest Annual Bonus”), and (y) a fraction, the numerator of which is the number of days in the current fiscal year through the Separation Date, and the denominator of which is 365, and (2) an amount equal to the sum of (x) 18 multiplied by the amount of the highest monthly premium for COBRA continuation coverage (within the meaning of Section 4980B of the Code) under the group health plan of the Company and its affiliated companies as in effect and applicable generally to the Executive’s peer executives of the Company and its affiliated companies during the 12-month period immediately preceding the Executive’s Separation Date, and (y) any accrued vacation pay to the extent not theretofore paid (the sum of the amounts described in clauses (1) and (2) are hereinafter referred to as the “Accrued Obligations”); and

(B)    an amount (such amount is hereinafter referred to as the “Severance Amount”) equal to the product of (1) three and (2) the sum of (x) the Executive’s Base Salary and (y) the Highest Annual Bonus; and

7

Exhibit 10.66

(C)    a separate lump-sum supplemental retirement benefit (the amount of such benefit hereinafter referred to as the “Supplemental Retirement Amount”) equal to the difference between (1) the actuarial equivalent (utilizing for this purpose the actuarial assumptions utilized with respect to the qualified defined benefit retirement plan of the Company and its affiliated companies in which the Executive is eligible to participate (or any successor plan thereto) (the “Retirement Plan”) during the 120-day period immediately preceding the Effective Date) of the benefit payable under the Retirement Plan and any supplemental and/or excess retirement plan of the Company and its affiliated companies providing benefits for the Executive (the “SERP”) which the Executive would receive if the Executive’s employment continued at the compensation level provided for in Paragraphs 4(a) and 4(b)(i) for the remainder of the Employment Term, assuming for this purpose that all accrued benefits are fully vested and that benefit accrual formulas are no less advantageous to the Executive than those in effect during the 120-day period immediately preceding the Effective Date, and (2) the actuarial equivalent (utilizing for this purpose the actuarial assumptions utilized with respect to the Retirement Plan during the 120-day period immediately preceding the Effective Date) of the Executive’s actual benefit (paid or payable), if any, under the Retirement Plan and the SERP; and

(ii)    for eighteen months after the Executive’s Separation Date, the Company shall continue benefits to the Executive and/or the Executive’s family at least equal to those that would have been provided to them in accordance with the plans, programs and arrangements described in Paragraph 4(c)(ii) if the Executive’s employment hereunder was continuing, in accordance with the most favorable plans, programs and arrangements of the Company and its affiliated companies as in effect and applicable generally to the Executive’s peer executives of the Company and its affiliated companies and their families during the 120-day period immediately preceding the Effective Date or, if more favorable to the Executive, as in effect generally at any time thereafter with respect to the Executive’s peer executives of the Company and its affiliated companies and their families; provided, however, that if the Executive becomes reemployed with another employer and is eligible to receive medical or other welfare benefits under another employer provided plan, the medical and other welfare benefits described herein shall be secondary to those provided under such other plan during such applicable period of eligibility (such continuation of such benefits for the applicable period herein set forth is hereinafter referred to as “Welfare Benefit Continuation”) (for purpose of determining eligibility of the Executive for retiree benefits pursuant to such plans, programs and arrangements, the Executive shall be considered to have remained employed hereunder until three years after the Separation Date and to have retired on the last day of such period); and

(iii)    for six months following the Executive’s Separation Date, the Company shall, at its sole expense as incurred, provide the Executive with outplacement services the scope and provider of which shall be selected by the Executive in the Executive’s sole discretion; provided, however, that (A) an expense for such outplacement services shall be paid by the Company or reimbursed by the Company to the Executive as soon as practicable after such expense is incurred (but in no event later than 30 days after such expense is incurred), and (B) the total amount of the expenses paid or reimbursed by the Company pursuant to this Paragraph 6(a)(iii) shall not exceed $50,000; and

(iv)    no later than 90 days after Executive’s Separation Date, all club memberships and other memberships that the Company was providing for the Executive’s use at the earlier of the Executive’s Separation Date or the time Notice of Termination is given shall, to the extent possible, be transferred and assigned to the Executive at no cost to the Executive (other than income taxes owed), the cost of transfer, if any, to be borne by the Company; and

8

Exhibit 10.66

(v)    all benefits under the Noble Corporation 1991 Stock Option and Restricted Stock Plan and any other similar plans, including any stock options or restricted stock held by the Executive, not already vested shall be 100% vested, to the extent such vesting is permitted under the Code; and

(vi)    to the extent not theretofore paid or provided, the Company shall timely pay or provide to the Executive when otherwise due any other amounts or benefits required to be paid or provided or which the Executive is eligible to receive under any plan, program, policy, practice or arrangement or contract or agreement of the Company and its affiliated companies (such other amounts and benefits hereinafter referred to as the “Other Benefits”), it being understood that in no event shall the Inducement Agreement, or any amounts that would arguably be payable to the Executive thereunder, qualify as Other Benefits.

(b)Death. If the Executive’s Separation from Service occurs by reason of the Executive’s death, this Agreement shall terminate without further obligations to the Executive’s legal representatives under this Agreement, other than for (i) payment of the Accrued Obligations (which shall be paid to the Executive’s estate or beneficiary, as applicable, in a lump sum in cash within 30 days after the Executive’s Separation Date) and the timely payment or provision of the Welfare Benefit Continuation and the Other Benefits and (ii) payment to the Executive’s estate or beneficiaries, as applicable, in a lump sum in cash within 30 days after the Executive’s Separation Date of an amount equal to the sum of the Severance Amount and the Supplemental Retirement Amount. With respect to the provision of Other Benefits, the term “Other Benefits” as used in this Paragraph 6(b) shall include, without limitation, and the Executive’s estate and/or beneficiaries shall be entitled to receive, death benefits at least equal to the most favorable benefits provided by the Company and its affiliated companies to the estates and beneficiaries of the Executive’s peer executives of the Company and such affiliated companies under such plans, programs, practices and policies relating to death benefits, if any, as in effect with respect to the peer executives and their beneficiaries at any time during the 120-day period immediately preceding the Effective Date or, if more favorable to the Executive’s estate and/or the Executive’s beneficiaries, as in effect on the date of the Executive’s death with respect to other of the Executive’s peer executives of the Company and its affiliated companies and their beneficiaries.

(c)Disability. Subject to the provisions of Paragraph 6(e) of this Agreement, if the Executive’s Separation from Service occurs by reason of the Executive’s Disability, this Agreement shall terminate without further obligations to the Executive, other than for (i) payment of the Accrued Obligations, the Severance Amount and the Supplemental Retirement Amount (each of which shall be paid to the Executive in a lump sum in cash within 30 days after the Executive’s Separation Date), (ii) the timely payment or provision of the Other Benefits, and (iii) the timely payment or provision of the Welfare Benefit Continuation. With respect to the provision of Other Benefits, the term “Other Benefits” as used in this Paragraph 6(c) shall include, without limitation, and the Executive shall be entitled upon Separation from Service to receive, disability benefits at least equal to the most favorable of those generally provided by the Company and its affiliated companies to disabled executives and/or their families in accordance with such plans, programs, practices and policies relating to disability, if any, as in effect generally with respect to other of the Executive’s peer executives of the Company and their families at any time during the 120-day period immediately preceding the Effective Date or, if more favorable to the Executive and/or the Executive’s family, as in effect at any time thereafter generally with respect to other of the Executive’s peer executives of the Company and its affiliated companies and their families.

(d)Cause; Other than for Good Reason or During the Window Period.

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Exhibit 10.66

(i)    If the Executive’s Separation from Service occurs by reason of the Company’s termination of Executive’s employment hereunder for Cause, this Agreement shall terminate without further obligations to the Executive hereunder other than the obligation to pay the Executive’s Base Salary through the Executive’s Separation Date and the timely payment or provision of deferred compensation and other employee benefits if and when otherwise due.

(ii)    If the Executive’s Separation from Service occurs by reason of the Executive’s voluntary termination of the Executive’s employment hereunder, excluding a termination of such employment by the Executive either for Good Reason or without any reason during the Window Period, this Agreement shall terminate without further obligations to the Executive hereunder other than for (1) the payment of the Executive’s Base Salary through the Executive’s Separation Date to the extent not theretofore paid, (2) the payment of the Accrued Obligations (which, subject to the provisions of Paragraph 6(e) of this Agreement, shall be paid to the Executive in a lump sum in cash within 30 days after the Executive’s Separation Date), and (3) the timely payment or provision of deferred compensation and other employee benefits if and when otherwise due.

(e)Payment Delay for Specified Employee. Any provision of this Agreement to the contrary notwithstanding, if the Executive is a Specified Employee (as defined in Paragraph 10 below) on the Executive’s Separation Date, then any payment or benefit to be paid, transferred or provided to the Executive pursuant to the provisions of this Agreement that would be subject to the tax imposed by Section 409A of the Code if paid, transferred or provided at the time otherwise specified in this Agreement shall be delayed and thereafter paid, transferred or provided on the first business day that is 6 months after the Executive’s Separation Date (or if earlier, within 30 days after the date of the Executive’s death following the Executive’s Separation from Service) to the extent necessary for such payment or benefit to avoid being subject to the tax imposed by Section 409A of the Code.

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Exhibit 10.66

7.Certain Additional Payments by the Company.

(a)    Notwithstanding any provision in this Agreement to the contrary and except as set forth below, if it shall be determined that any payment or distribution by the Company to or for the benefit of the Executive (whether paid or payable or distributed or distributable pursuant to the terms of this Agreement or otherwise, but determined without regard to any additional payments required pursuant to this Paragraph 7) (a “Payment”) would be subject to the excise tax imposed by Section 4999 of the Code or any interest or penalties are incurred by the Executive with respect to such excise tax (such excise tax, together with any such interest and penalties, are hereinafter collectively referred to as the “Excise Tax”), then the Executive shall be entitled to receive an additional payment (a “Gross-Up Payment”) in an amount such that after payment by the Executive of all taxes (including any interest or penalties imposed with respect to such taxes), including any income taxes (and any interest and penalties imposed with respect thereto) and Excise Tax imposed upon the Gross-Up Payment, the Executive retains an amount of the Gross-Up Payment equal to the Excise Tax imposed upon the Payments. Notwithstanding the foregoing provisions of this Paragraph 7(a), if it shall be determined that the Executive is entitled to a Gross-Up Payment, but that the Executive, after taking into account the Payments and the Gross-Up Payment, would not receive a net after-tax benefit of at least $50,000 (taking into account both income taxes and any Excise Tax) as compared to the net after-tax proceeds to the Executive resulting from an elimination of the Gross-Up Payment and a reduction of the Payments, in the aggregate, to an amount (the “Reduced Amount”) such that the receipt of payments would not give rise to any Excise Tax, then no Gross-Up Payment shall be made to the Executive and the Payments, in the aggregate, shall be reduced to the Reduced Amount.

(b)    Subject to the provisions of Paragraph 7(c), all determinations required to be made under this Paragraph 7, including whether and when a Gross-Up Payment is required and the amount of such Gross-Up Payment and the assumptions to be utilized in arriving at such determination, shall be made by PricewaterhouseCoopers LLP (the “Accounting Firm”) or, as provided below, such other certified public accounting firm as may be designated by the Executive, which shall provide detailed supporting calculations both to the Company and the Executive within 15 business days after the receipt of notice from the Executive that there has been a Payment, or such earlier time as is requested by the Company. If the Accounting Firm is serving as accountant or auditor for the individual, entity or group effecting the Change of Control, the Executive shall have the option, in the Executive’s sole discretion, to appoint another nationally recognized accounting firm to make the determinations required hereunder (which accounting firm shall then be referred to as the “Accounting Firm” hereunder). All fees and expenses of the Accounting Firm shall be borne solely by the Company. Any Gross-Up Payment, as determined pursuant to this Paragraph 7, shall be paid by the Company to the Executive within five days of the receipt of the Accounting Firm’s determination. If the Accounting Firm determines that no Excise Tax is payable by the Executive, it shall furnish the Executive with a written opinion that failure to report the Excise Tax on the Executive’s applicable federal income tax return would not result in the imposition of a negligence or similar penalty. Any determination by the Accounting Firm shall be binding upon the Company and the Executive. As a result of the uncertainty in the application of Section 4999 of the Code at the time of the initial determination by the Accounting Firm hereunder, it is possible that Gross-Up Payments that will not have been made by the Company should have been made (“Underpayment”), consistent with the calculations required to be made hereunder. If the Company exhausts its remedies pursuant to Paragraph 7(c) and the Executive thereafter is required to make a payment of any Excise Tax, the Accounting Firm shall determine the amount of the Underpayment that has occurred and any such Underpayment shall be promptly paid by the Company to or for the benefit of the Executive.

(c)    The Executive shall notify the Company in writing of any claim by the Internal Revenue Service of the United States (the “Internal Revenue Service”) that, if successful, would require the payment by the Company of the Gross-Up Payment (or an additional amount of Gross-Up Payment) in the

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Exhibit 10.66

event the Internal Revenue Service seeks higher payment. Such notification shall be given as soon as practicable but no later than 10 business days after the Executive is informed in writing of such claim and shall apprise the Company of the nature of such claim and the date on which such claim is requested to be paid. The Executive shall not pay such claim prior to the expiration of the 30-day period following the date on which it gives such notice to the Company (or such shorter period ending on the date that any payment of taxes with respect to such claim is due). If the Company notifies the Executive in writing prior to the expiration of such period that it desires to contest such claim, the Executive shall:

(i)    give the Company any information reasonably requested by the Company relating to such claim;

(ii)    take such action in connection with contesting such claim as the Company shall reasonably request in writing from time to time, including the acceptance of legal representation with respect to such claim by an attorney reasonably selected by the Company;

(iii)    cooperate with the Company in good faith in order effectively to contest such claim; and

(iv)    permit the Company and/or Noble-London to participate in any proceedings relating to such claim;

provided, however, that the Company shall bear and pay directly all costs and expenses (including additional interest and penalties) incurred in connection with such contest and shall indemnify and hold the Executive harmless, on an after-tax basis, for any Excise Tax or income tax (including interest and penalties with respect thereto) imposed as a result of such representation and payment of costs and expenses. Without limitation of the foregoing provisions of this Paragraph 7(c), the Company shall control all proceedings taken in connection with such contest and, at its sole option, may pursue or forgo any and all administrative appeals, proceedings, hearings and conferences with the taxing authority in respect of such claim and may, at its sole option, either direct the Executive to pay the tax claimed and sue for a refund or contest the claim in any permissible manner, and the Executive agrees to prosecute such contest to a determination before any administrative tribunal, in a court of initial jurisdiction, and in one or more appellate courts, as the Company shall determine; provided, however, that if the Company directs the Executive to pay such claim and sue for a refund, the Company shall advance the amount of such payment to the Executive, on an interest-free basis, and shall indemnify and hold the Executive harmless, on an after-tax basis, from any Excise Tax or income tax (including interest or penalties with respect thereto) imposed with respect to such advance or with respect to any imputed income with respect to such advance; and provided further, that any extension of the statute of limitations relating to payment of taxes for the taxable year of the Executive with respect to which such contested amount is claimed to be due is limited solely to such contested amount. Furthermore, the Company’s control of the contest shall be limited to issues with respect to which a Gross-Up Payment would be payable hereunder and the Executive shall be entitled to settle or contest, as the case may be, any other issue raised by the Internal Revenue Service or any other taxing authority.

(d)    If, after the receipt by the Executive of an amount advanced by the Company pursuant to Paragraph 7(c), the Executive becomes entitled to receive any refund with respect to such claim, the Executive shall (subject to the Company’s complying with the requirements of Paragraph 7(c)) pay the amount of such refund to the Company within 30 days of the receipt thereof by the Executive (together with any interest paid or credited thereon after taxes applicable thereto). If, after the receipt by the Executive of an amount advanced by the Company pursuant to Paragraph 7(c), a determination is made that the Executive shall not be entitled to any refund with respect to such claim and the Company does not notify the Executive

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Exhibit 10.66

in writing of its intent to contest such denial of refund prior to the expiration of 30 days after such determination, then such advance shall be forgiven and shall not be required to be repaid and the amount of such advance shall offset, to the extent thereof, the amount of Gross-Up Payment required to be paid.

(e)    Unless sooner paid pursuant to the foregoing provisions of this Paragraph 7, (i) any tax gross-up payment (within the meaning of Treas. Reg. section 1.409A-3(i)(1)(v)) to be paid to or for the benefit of the Executive pursuant to this Paragraph 7 shall be paid no later than the end of the Executive’s taxable year that immediately follows the taxable year of the Executive in which the Executive remits the related taxes, and (ii) any amount to be paid to or for the benefit of the Executive pursuant to this Paragraph 7 for expenses incurred due to a tax audit or litigation addressing the existence or the amount of a tax liability referred to in this Paragraph 7 shall be paid no later than the end of the Executive’s taxable year that immediately follows the taxable year of the Executive in which the taxes that are the subject matter of the audit or litigation are remitted to the taxing authority, or where as a result of such audit or litigation no taxes are remitted, the end of the Executive’s taxable year that immediately follows the taxable year of the Executive in which the audit is completed or there is a final and non-appealable settlement or other resolution of the litigation.

8.Representations and Warranties.

(a)    The Company represents and warrants to the Executive that the execution, delivery and performance by the Company of this Agreement have been duly authorized by all necessary corporate action of the Company and do not and will not conflict with or result in a violation of any provision of, or constitute a default under, any contract, agreement, instrument or obligation to which the Company is a party or by which it is bound.

(b)    The Executive represents and warrants to the Company that the execution, delivery and performance by the Executive of this Agreement do not and will not conflict with or result in a violation of any provision of, or constitute a default under, any contract, agreement, instrument or obligation to which the Executive is a party or by which the Executive is bound.

9.Confidential Information. The Executive recognizes and acknowledges that the Company’s and its affiliated companies’ trade secrets and other confidential or proprietary information, as they may exist from time to time, are valuable, special and unique assets of the Company’s and/or such affiliated companies’ business, access to and knowledge of which are essential to the performance of the Executive’s duties hereunder. The Executive confirms that all such trade secrets and other information constitute the exclusive property of the Company and/or such affiliated companies. During the Employment Term and thereafter without limitation of time, the Executive shall hold in strict confidence and shall not, directly or indirectly, disclose or reveal to any person, or use for the Executive’s own personal benefit or for the benefit of anyone else, any trade secrets, confidential dealings or other confidential or proprietary information of any kind, nature or description (whether or not acquired, learned, obtained or developed by the Executive alone or in conjunction with others) belonging to or concerning the Company or any of its affiliated companies, except (i) with the prior written consent of the Company duly authorized by its Board, (ii) in the course of the proper performance of the Executive’s duties hereunder, (iii) for information (x) that becomes generally available to the public other than as a result of unauthorized disclosure by the Executive or the Executive’s affiliates or (y) that becomes available to the Executive on a nonconfidential basis from a source other than the Company or its affiliated companies who is not bound by a duty of confidentiality, or other contractual, legal or fiduciary obligation, to the Company, or (iv) as required by applicable law or legal process. The provisions of this Paragraph 9 shall continue in effect notwithstanding termination of the Executive’s employment hereunder for any reason.

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Exhibit 10.66

10.Certain Definitions.

(a)Effective Date. For purposes of this Agreement, “Effective Date” shall mean the first date during the Change of Control Period (as defined in Paragraph 10 below) on which a Change of Control occurs. Notwithstanding anything in this Agreement to the contrary, if a Change of Control occurs and if the Executive’s Separation from Service occurs prior to the date on which the Change of Control occurs, and if it is reasonably demonstrated by the Executive that such Separation from Service (i) was at the request of a third party who has taken steps reasonably calculated to effect a Change of Control or (ii) otherwise arose in connection with or anticipation of a Change of Control, then for all purposes of this Agreement the “Effective Date” shall mean the date immediately prior to the date of such Separation from Service.

(b)Change of Control Period. For purposes of this Agreement, “Change of Control Period” shall mean the period commencing on the date of this Agreement and ending on the third anniversary of such date; provided, however, that commencing on the date one year after the date hereof, and on each annual anniversary of such date (such date and each annual anniversary thereof herein referred to as the “Renewal Date”), the Change of Control Period shall be automatically extended so as to terminate three years after such Renewal Date, unless at least 60 days prior to the Renewal Date the Company shall give notice to the Executive that the Change of Control Period shall not be so extended.

(c)Change of Control. For purposes of this Agreement, a “Change of Control” shall mean:

(i)    the acquisition by any individual, entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act) (a “Person”) of beneficial ownership (within the meaning of Rule 13d-3 promulgated under the Exchange Act) of 15% or more of either (A) the then outstanding Registered Shares of Noble-London, excluding any treasury shares (the “Outstanding Parent Shares”), or (B) the combined voting power of the then outstanding voting securities of Noble-London entitled to vote generally in the election of directors (the “Outstanding Parent Voting Securities”); provided, however, that for purposes of this subparagraph (c)(i) the following acquisitions shall not constitute a Change of Control: (w) any acquisition directly from Noble-London (excluding an acquisition by virtue of the exercise of a conversion privilege), (x) any acquisition by Noble-London, (y) any acquisition by any employee benefit plan (or related trust) sponsored or maintained by Noble-London or any company controlled by Noble-London, or (z) any acquisition by any corporation pursuant to a reorganization, merger, amalgamation or consolidation, if, following such reorganization, merger, amalgamation or consolidation, the conditions described in clauses (A), (B) and (C) of subparagraph (iii) of this Paragraph 10(c) are satisfied; or

(ii)    individuals who, as of the date of this Agreement, constitute the Noble-London Board (the “Incumbent Board”) cease for any reason to constitute a majority of such Board of Directors; provided, however, that any individual becoming a director of Noble-London subsequent to the date hereof whose election, or nomination for election by Noble-London’s shareholders, was approved by a vote of a majority of the directors of Noble-London then comprising the Incumbent Board shall be considered as though such individual were a member of the Incumbent Board, but excluding, for this purpose, any such individual whose initial assumption of office occurs as a result of either an actual or threatened election contest or other actual or threatened solicitation of proxies or consents by or on behalf of a Person other than the Noble-London Board; or

(iii)    consummation of a reorganization, merger, amalgamation or consolidation of Noble-London, with or without approval by the shareholders of Noble-London, in each case, unless,

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Exhibit 10.66

following such reorganization, merger, amalgamation or consolidation, (A) more than 50% of, respectively, the then outstanding shares of common stock (or equivalent security) of the company resulting from such reorganization, merger, amalgamation or consolidation and the combined voting power of the then outstanding voting securities of such company entitled to vote generally in the election of directors is then beneficially owned, directly or indirectly, by all or substantially all of the individuals and entities who were the beneficial owners, respectively, of the Outstanding Parent Shares and Outstanding Parent Voting Securities immediately prior to such reorganization, merger, amalgamation or consolidation in substantially the same proportions as their ownership, immediately prior to such reorganization, merger, amalgamation or consolidation, of the Outstanding Parent Shares and Outstanding Parent Voting Securities, as the case may be, (B) no Person (excluding Noble-London, any employee benefit plan (or related trust) of Noble-London or such company resulting from such reorganization, merger, amalgamation or consolidation, and any Person beneficially owning, immediately prior to such reorganization, merger, amalgamation or consolidation, directly or indirectly, 15% or more of the Outstanding Parent Shares or Outstanding Parent Voting Securities, as the case may be) beneficially owns, directly or indirectly, 15% or more of, respectively, the then outstanding shares of common stock (or equivalent security) of the company resulting from such reorganization, merger, amalgamation or consolidation or the combined voting power of the then outstanding voting securities of such company entitled to vote generally in the election of directors, and (C) a majority of the members of the board of directors of the company resulting from such reorganization, merger, amalgamation or consolidation were members of the Incumbent Board at the time of the execution of the initial agreement providing for such reorganization, merger, amalgamation or consolidation; or

(iv)    consummation of a sale or other disposition of all or substantially all the assets of Noble-London, with or without approval by the shareholders of Noble-London, other than to a corporation, with respect to which following such sale or other disposition, (A) more than 50% of, respectively, the then outstanding shares of common stock (or equivalent security) of such corporation and the combined voting power of the then outstanding voting securities of such corporation entitled to vote generally in the election of directors is then beneficially owned, directly or indirectly, by all or substantially all the individuals and entities who were the beneficial owners, respectively, of the Outstanding Parent Shares and Outstanding Parent Voting Securities immediately prior to such sale or other disposition in substantially the same proportion as their ownership, immediately prior to such sale or other disposition, of the Outstanding Parent Shares and Outstanding Parent Voting Securities, as the case may be, (B) no Person (excluding Noble-London, any employee benefit plan (or related trust) of Noble-London or such corporation, and any Person beneficially owning, immediately prior to such sale or other disposition, directly or indirectly, 15% or more of the Outstanding Parent Shares or Outstanding Parent Voting Securities, as the case may be) beneficially owns, directly or indirectly, 15% or more of, respectively, the then outstanding shares of common stock (or equivalent security) of such corporation or the combined voting power of the then outstanding voting securities of such corporation entitled to vote generally in the election of directors, and (C) a majority of the members of the board of directors of such corporation were members of the Incumbent Board at the time of the execution of the initial agreement or action of the Noble-London Board providing for such sale or other disposition of assets of Noble-London; or

(v)    approval by the shareholders of Noble-London of a complete liquidation or dissolution of Noble-London.

Notwithstanding the foregoing, or anything to the contrary set forth herein, a transaction or series of related transactions will not be considered to be a Change of Control if (i) Noble-London becomes a direct or indirect wholly owned subsidiary of a holding company and (ii) (A) immediately following such transaction(s), the then outstanding shares of common stock (or equivalent security) of such holding company and the combined voting power of the then outstanding voting securities of such holding company entitled to vote generally

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Exhibit 10.66

in the election of directors is then beneficially owned, directly or indirectly, by all or substantially all the individuals and entities who were the beneficial owners, respectively, of the Outstanding Parent Shares and Outstanding Parent Voting Securities immediately prior to such transaction(s) in substantially the same proportion as their ownership immediately prior to such transaction(s) of the Outstanding Parent Shares and Outstanding Parent Voting Securities, as the case may be, or (B) the shares of Outstanding Parent Voting Securities outstanding immediately prior to such transaction(s) constitute, or are converted into or exchanged for, a majority of the outstanding voting securities of such holding company immediately after giving effect to such transaction(s).

(d)Separation from Service. For purposes of this Agreement, “Separation from Service” shall mean the Executive’s separation from service (within the meaning of Section 409A of the Code and the regulations and other guidance promulgated thereunder) with the group of employers that includes the Company and each affiliated company. For this purpose, with respect to services as an employee, an employee’s Separation from Service shall occur on the date as of which the employee and his or her employer reasonably anticipate that no further services will be performed after such date or that the level of bona fide services the employee will perform after such date (whether as an employee or an independent contractor) will permanently decrease to no more than 20% of the average level of bona fide services performed (whether as an employee or an independent contractor) over the immediately preceding 36-month period (or the full period of services to the employer if the employee has been providing services to the employer less than 36 months).

(e)Specified Employee. For purposes of this Agreement, “Specified Employee” shall mean a specified employee within the meaning of Section 409A(a)(2) of the Code and the regulations and other guidance promulgated thereunder. Each Specified Employee will be identified by the Chief Executive Officer of Noble-London on each December 31, using such definition of compensation permissible under Treas. Reg. section 1.409A-1(i)(2) as said Chief Executive Officer shall determine in his or her discretion, and each Specified Employee so identified shall be treated as a Specified Employee for the purposes of this Agreement for the entire 12-month period beginning on the April 1 following a December 31 Specified Employee identification date.

(f)Separation Date. For purposes of this Agreement, “Separation Date” shall mean the date on which the Executive’s Separation from Service occurs.

11.Full Settlement.

(a)    There shall be no right of set off or counterclaim against, or delay in, any payments to the Executive, or to the Executive’s heirs or legal representatives, provided for in this Agreement, in respect of any claim against or debt or other obligation of the Executive or others, whether arising hereunder or otherwise.

(b)    In no event shall the Executive be obligated to seek other employment or take any other action by way of mitigation of the amounts payable to the Executive under any of the provisions of this Agreement, and such amounts shall not be reduced whether or not the Executive obtains other employment.

(c)    The Company agrees to pay as incurred, to the full extent permitted by law, all costs and expenses (including attorneys’ fees) that the Executive, or the Executive’s heirs or legal representatives, may reasonably incur as a result of any contest (regardless of the outcome thereof) by the Company, the Executive or others of the validity or enforceability of, or liability under, any provision of this Agreement, or any guarantee of performance thereof (including as a result of any contest by the Executive, or the

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Exhibit 10.66

Executive’s heirs or legal representatives, about the amount of any payment pursuant to this Agreement), plus in each case interest on any delayed payment at the applicable federal rate provided for in Section 7872(f)(2) of the Code. The amounts payable by the Company pursuant to this Paragraph 11(c) shall be paid as soon as practicable after such costs and expenses are incurred, but in no event later than the end of the taxable year of the Executive that immediately follows the taxable year of the Executive in which such costs and expenses were incurred.

12.No Effect on Other Contractual Rights. The provisions of this Agreement, and any payment provided for hereunder, shall not reduce any amounts otherwise payable to the Executive, or in any way diminish the Executive’s rights as an employee of the Company or any of its affiliated companies, whether existing on the date of this Agreement or hereafter, under any employee benefit plan, program or arrangement or other contract or agreement of the Company or any of its affiliated companies providing benefits to the Executive, it being understood any benefits described in Paragraphs 6(a)(i)-(v) that become payable hereunder shall be reduced by the amount of any “Separation Payment” that is paid or payable under the Inducement Agreement.

13.Indemnification; Directors and Officers Insurance. The Company shall (a) during the Employment Term and thereafter without limitation of time, indemnify and advance expenses to the Executive to the fullest extent permitted by the laws of the State of Delaware from time to time in effect and (b) ensure that during the Employment Term, Noble-London acquires and maintains directors and officers liability insurance covering the Executive (and to the extent Noble-London desires, other directors and officers of Noble-London and/or the Company and its affiliated companies) to the extent it is available at commercially reasonable rates as determined by the Noble-London Board; provided, however, that in no event shall the Executive be entitled to indemnification or advancement of expenses under this Paragraph 13 with respect to any proceeding or matter therein brought or made by the Executive against the Company or Noble-London other than one initiated by the Executive to enforce the Executive’s rights under this Paragraph 13. The rights of indemnification and to receive advancement of expenses as provided in this Paragraph 13 shall not be deemed exclusive of any other rights to which the Executive may at any time be entitled under applicable law, the Certificate of Incorporation or Bylaws of the Company, the Articles of Association of Noble-London, any agreement, a vote of shareholders, a resolution of the Board or the Noble-London Board, or otherwise. The provisions of this Paragraph 13 shall continue in effect notwithstanding termination of the Executive’s employment hereunder for any reason.

14.Injunctive Relief. In recognition of the fact that a breach by the Executive of any of the provisions of Paragraph 9 will cause irreparable damage to the Company and/or its affiliated companies for which monetary damages alone will not constitute an adequate remedy, the Company shall be entitled as a matter of right (without being required to prove damages or furnish any bond or other security) to obtain a restraining order, an injunction, an order of specific performance, or other equitable or extraordinary relief from any court of competent jurisdiction restraining any further violation of such provisions by the Executive or requiring the Executive to perform the Executive’s obligations hereunder. Such right to equitable or extraordinary relief shall not be exclusive but shall be in addition to all other rights and remedies to which the Company or any of its affiliated companies may be entitled at law or in equity, including without limitation the right to recover monetary damages for the breach by the Executive of any of the provisions of this Agreement.

15.Governing Law. This Agreement shall be governed by and construed and enforced in accordance with the laws of the State of Texas, without regard to the principles of conflicts of laws thereof.

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Exhibit 10.66

16.Notices. All notices, requests, demands and other communications required or permitted to be given or made hereunder by either party hereto shall be in writing and shall be deemed to have been duly given or made (i) when delivered personally, (ii) when sent by telefacsimile transmission, or (iii) five days after being deposited in the United States mail, first class registered or certified mail, postage prepaid, return receipt requested, to the party for which intended at the following addresses (or at such other addresses as shall be specified by the parties by like notice, except that notices of change of address shall be effective only upon receipt):

If to the Company, at:    Noble Drilling Services Inc.
    13135 S. Dairy Ashford, Ste. 800
    Sugar Land, TX 77478
    Fax No.: (281) 276-6336
    Attention: Legal Department

If to the Executive, at:     Noble Drilling Services Inc.
    13135 S. Dairy Ashford, Ste. 800
    Sugar Land, TX 77478
    Fax No.: (281) 276-6336
    Attention: Julie J. Robertson

17.Binding Effect; Assignment; No Third Party Benefit.

(a)    This Agreement is personal to the Executive and without the prior written consent of the Company shall not be assignable by the Executive otherwise than by will or the laws of descent and distribution. This Agreement shall inure to the benefit of and shall be enforceable by the Executive’s legal representatives.

(b)    This Agreement shall inure to the benefit of and be binding upon the Company and its successors and assigns.

(c)    The Company shall require any successor or assign (whether direct or indirect, by purchase, merger, consolidation, amalgamation or otherwise) to all or substantially all the business and/or assets of the Company, by agreement in writing in form and substance reasonably satisfactory to the Executive, expressly, absolutely and unconditionally to assume and agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform it if no such succession or assignment had taken place. As used in this Agreement, the “Company” shall mean the Company as hereinbefore defined and any successor or assign to the business and/or assets of the Company as aforesaid which executes and delivers the agreement provided for in this Paragraph 17(c) or which otherwise becomes bound by all the terms and provisions of this Agreement by operation of law. The Company shall require that the guaranty of Noble-London of the obligations of the Company under this Agreement shall contain a similar provision regarding any successor or assign of Noble-London.

(d)    Nothing in this Agreement, express or implied, is intended to or shall confer upon any person other than the parties hereto and Noble-London, and their respective heirs, legal representatives, successors and permitted assigns, any rights, benefits or remedies of any nature whatsoever under or by reason of this Agreement.

18.Miscellaneous.

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Exhibit 10.66

(a)Amendment. This Agreement may not be modified or amended in any respect except by an instrument in writing signed by the party against whom such modification or amendment is sought to be enforced. No person, other than pursuant to a resolution of the Board or a committee thereof, which resolution is approved by the Noble-London Board or a committee thereof, shall have authority on behalf of the Company to agree to modify, amend or waive any provision of this Agreement or anything in reference thereto.

(b)Waiver. Any term or condition of this Agreement may be waived at any time by the party hereto which is entitled to have the benefit thereof, but such waiver shall only be effective if evidenced by a writing signed by such party, and a waiver on one occasion shall not be deemed to be a waiver of the same or any other type of breach on a future occasion. No failure or delay by a party hereto in exercising any right or power hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right or power.

(c)Withholding Taxes. The Company may withhold from any amounts payable under this Agreement such federal, state, local or foreign taxes as shall be required to be withheld pursuant to any applicable law or regulation.

(d)Nonalienation of Benefits. The Executive shall not have any right to pledge, hypothecate, anticipate or in any way create a lien upon any payments or other benefits provided under this Agreement; and no benefits payable hereunder shall be assignable in anticipation of payment either by voluntary or involuntary acts, or by operation of law, except by will or pursuant to the laws of descent and distribution.

(e)Severability. If any provision of this Agreement is held to be invalid or unenforceable, (a) this Agreement shall be considered divisible, (b) such provision shall be deemed inoperative to the extent it is deemed invalid or unenforceable, and (c) in all other respects this Agreement shall remain in full force and effect; provided, however, that if any such provision may be made valid or enforceable by limitation thereof, then such provision shall be deemed to be so limited and shall be valid and/or enforceable to the maximum extent permitted by applicable law.

(f)Entire Agreement. This Agreement constitutes the entire agreement between the parties hereto concerning the subject matter hereof, and from and after the date of this Agreement, this Agreement shall supersede any other prior agreement or understanding, both written and oral, between the parties with respect to such subject matter.

(g)Captions. The captions herein are inserted for convenience of reference only, do not constitute a part of this Agreement, and shall not affect in any manner the meaning or interpretation of this Agreement.

(h)References. All references in this Agreement to Paragraphs, subparagraphs and other subdivisions refer to the Paragraphs, subparagraphs and other subdivisions of this Agreement unless expressly provided otherwise. The words “this Agreement”, “herein”, “hereof”, “hereby”, “hereunder” and words of similar import refer to this Agreement as a whole and not to any particular subdivision unless expressly so limited. Whenever the words “include”, “includes” and “including” are used in this Agreement, such words shall be deemed to be followed by the words “without limitation”. Words in the singular form shall be construed to include the plural and vice versa, unless the context otherwise requires.

[Execution page follows]

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Exhibit 10.66

IN WITNESS WHEREOF, the Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and the Executive has executed this Agreement.

“COMPANY”

Noble Drilling Services Inc.

By:     /s/ Thomas A. Madden        

Name: Thomas A. Madden

Title: Vice President & General Manager of Administration, Human Resources

“EXECUTIVE”

/s/ Julie J. Robertson            

Julie J. Robertson

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Exhibit 10.66

GUARANTY

This DEED OF GUARANTY is made as of February 21, 2018 and effective January 11, 2018 by Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (the “Parent Company”), for the benefit of Julie J. Robertson (the “Executive”);

WITNESSETH:

WHEREAS, Noble Drilling Services Inc., a Delaware corporation and an indirect, wholly owned subsidiary of the Parent Company (“Noble”), has previously entered into a Restated Employment Agreement with the Executive as of November 20, 2013 (the “Original Employment Agreement”); and

WHEREAS, the Parent Company desires to guarantee the performance by Noble of its obligations under that certain Restated Employment Agreement of even date herewith by and between Noble Drilling Services Inc., a Delaware corporation, and Julie J. Robertson (the “Employment Agreement”), and the Board of Directors of the Parent Company has determined that it is reasonable and prudent for the Parent Company to deliver this Guaranty and necessary to promote and ensure the best interests of the Parent Company and its shareholders;

NOW, THEREFORE, in consideration of the premises, the Parent Company hereby irrevocably and unconditionally guarantees, as primary obligor, the due and punctual performance by Noble of its agreements and obligations, all and singular, under the Employment Agreement. This Guaranty shall survive any liquidation of Noble or any of its subsidiaries. This Guaranty shall be governed by and construed in accordance with the laws of the State of Texas.

The obligations of the Parent Company hereunder shall be absolute and unconditional and shall remain in full force and effect until the termination of the Employment Agreement or the complete performance by Noble of its obligations thereunder, irrespective of the validity, regularity or enforceability of the Employment Agreement, any change or amendment thereto, the absence of any action to enforce the same, any waiver or consent by the Executive or Noble with respect to any provision of the Employment Agreement, the recovery of any judgment against Noble or any action to enforce the same, or any other circumstances that may otherwise constitute a legal or equitable discharge or defense of the Parent Company. The Parent Company waives any right of set-off or counterclaim it may have against the Executive arising from any other obligations the Executive may have to Noble or the Parent Company.

The Parent Company shall require any successor or assign (whether direct or indirect, by purchase, merger, reorganization, consolidation, amalgamation or otherwise) to all or substantially all the business and/or assets of the Parent Company, by agreement in writing in form and substance reasonably satisfactory to the Executive, expressly, absolutely and unconditionally to assume and agree to perform this Guaranty in the same manner and to the same extent that the Parent Company would be required to perform it if no such succession or assignment had taken place. As used in this Guaranty, the “Parent Company” shall mean the Parent Company as hereinbefore defined and any successor or assign to the business and/or assets of the Parent Company

21

Exhibit 10.66

as aforesaid which executes and delivers the agreement provided for in this paragraph or which otherwise becomes bound by all the terms and provisions of this Guaranty by operation of law.

[Execution page follows]

22

Exhibit 10.66

IN WITNESS WHEREOF, the Parent Company has caused this Deed of Guaranty to be executed as a deed on its behalf, and duly delivered, as of the date first above set forth.

EXECUTED as a DEED by
NOBLE CORPORATION PLC

Acting by: /s/ Adam C. Peakes            Adam C. Peakes,

Senior Vice President and

Chief Financial Officer

In the presence of:

Witness signature:    /s/ Sarah M. Rechter_________

Witness Name: Sarah M. Rechter

Address: 13135 South Dairy Ashford

Sugar Land, Texas 77478

Occupation: Attorney

23

EX-21.1

Exhibit 21.1

NOBLE CORPORATION PLC SUBSIDIARIES (as of December 31, 2017)
Name	Country of incorporation
Noble Corporation Holdings Limited	Cayman Islands	*
Noble Financing Services Limited	Cayman Islands	*
Noble (Servco) UK Limited	United Kingdom	*
Noble Corporation	Cayman Islands
Noble Aviation GmbH	Switzerland
Noble Services (Switzerland) GmbH	Switzerland
Noble NDC Holding (Cyprus) Limited	Cyprus
Noble FDR Holdings Limited	Cayman Islands
Noble Holding International (Luxembourg NHIL) S.à r.l	Luxembourg
Noble Holding International (Luxembourg) S.à r.l	Luxembourg
Noble Drilling (Luxembourg) S.à r.l	Luxembourg
Noble Drillships Holdings, Ltd.	Cayman Islands
Noble Drillships Holdings 2, Ltd.	Cayman Islands
Frontier Driller, Ltd.	Cayman Islands/Luxembourg
Frontier Drilling Cayman, Ltd.	Cayman Islands
Noble Holding S.C.S.	Luxembourg
Noble Drilling (Cyprus) Limited (pending dissolution)	Cyprus
Noble Downhole Technology Ltd.	Cayman Islands
Noble Drilling International GmbH	Switzerland
Noble Drilling Holding GmbH	Switzerland
Noble Holding UK Limited	United Kingdom
Noble Holding (U.S.) Corporation	Delaware
Noble Drillships S.à r.l	Luxembourg
Noble Drillships 2 S.à r.l	Luxembourg
Frontier Driller Kft.	Hungary
Noble Holding International S.à r.l.	Luxembourg
Noble Technology (Canada) Ltd.	Alberta, Canada
Noble Engineering & Development de Venezuela C.A.	Venezuela
Triton Engineering Services Company	Delaware
Noble Drilling (U.S.) LLC	Delaware
Noble Drilling Services 3 LLC	Delaware
Noble Drilling Services 2 LLC	Delaware
Noble Drilling Services Inc.	Delaware
Maurer Technology Incorporated	Delaware
Bully 1 (Switzerland) GmbH	Switzerland
Bully 2 (Switzerland) GmbH	Switzerland
Frontier Driller, Inc.	Delaware
Noble Drilling (Jim Thompson) LLC	Delaware
Noble Johnnie Hoffman LLC	Delaware
Noble John Sandifer LLC	Delaware
Noble Drilling Exploration Company	Delaware
Bully 1 (US) Corporation	Delaware
Bully 2 (Luxembourg) S.à r.l.	Luxembourg
Noble Drilling Holding LLC	Delaware

Exhibit 21.1

NOBLE CORPORATION PLC SUBSIDIARIES (as of December 31, 2017)
Noble International Services LLC	Delaware
Noble Drilling Americas LLC	Delaware
Noble North Africa Limited	Cayman Islands
Noble Drilling Services 6 LLC	Delaware
Noble Cayman Limited	Cayman Islands
Triton International, Inc.	Delaware
Triton Engineering Services Company, S.A.	Venezuela
Noble Deepwater Ltd.	Cayman Islands
Triton International de Mexico S.A. de C.V.	Mexico
Noble Deepwater (B) Sdn. Bhd.	Brunei
Noble Drilling West Africa Limited	Nigeria
Noble Drilling Offshore Limited	Cayman Islands
TSIA International (Antilles) N.V. (pending dissolution)	Curacao
Noble Drilling Singapore Pte. Ltd.	Singapore
Noble Resources Limited	Cayman Islands
Noble Services International Limited	Cayman Islands
NE Drilling Servicos do Brasil Ltda.	Brazil
NE do Brasil Participacoes E Investimentos Ltda.	Brazil
Noble Earl Frederickson LLC	Delaware
Noble Bill Jennings LLC	Delaware
Noble Asset Mexico LLC	Delaware
Noble Holding (Luxembourg) S.à r.l	Luxembourg
Noble Drilling Holdings (Cyprus) Limited	Cyprus
Noble Drilling Egypt LLC	Egypt
Noble Leasing III (Switzerland) GmbH	Switzerland
Noble Drilling (N.S.) Limited	Scotland
Noble Drilling (Nederland) II B.V.	Netherland
Noble Contracting II GmbH	Switzerland
Noble Holding Europe S.à r.l.	Luxembourg
Noble Leasing (Switzerland) GmbH	Switzerland
Noble Mexico Services Limited	Cayman Islands
Noble Mexico Limited	Cayman Islands
Noble International Finance Company	Cayman Islands
Noble Drilling (TVL) Ltd.	Cayman Islands
Noble Drilling (Carmen) Limited	Cayman Islands
Noble Gene Rosser Limited	Cayman Islands
Noble Campeche Limited	Cayman Islands
Noble Offshore Mexico Limited	Cayman Islands
Noble Offshore Contracting Limited	Cayman Islands
Noble Dave Beard Limited	Cayman Islands
Sedco Dubai LLC	Dubai, UAE
Noble Drilling (Paul Wolff) Ltd.	Cayman Islands
Noble India Limited	Cayman Islands
Noble Drilling Arabia Company Ltd.	Saudi Arabia
Noble Drilling (Land Support) Limited	Scotland
Noble Drilling (Norway) AS	Norway
Noble Drilling Offshore (Labuan) Pte Ltd.	Labuan, Malaysia

Exhibit 21.1

NOBLE CORPORATION PLC SUBSIDIARIES (as of December 31, 2017)
Noble Contracting Offshore Drilling (M) Sdn Bhd	Malaysia
Noble Drilling International Services Pte. Ltd. (pending dissolution)	Singapore
Noble Offshore (North Sea) Ltd.	Cayman Islands
Noble Offshore Services de Mexico, S. de R.L. de C.V.	Mexico
Noble Drilling Services (Canada) Corporation	Nova Scotia, Canada

* Indicates subsidiary of Noble Corporation plc only.

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Forms S-8 (Nos. 333-218129, 333-218128, 333-214476, 333-206802, 333-181204, 333-133601-99, 333-107451-99, 033-62394-99, 333-107450-99, 333-80511-99, 033-46724-99, 333-25857-99, 333-179329, 333-133599-99, 333-17407-99, and 033-57675-99) of Noble Corporation plc of our reportdated February 23, 2018 relating to the consolidated financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

Houston, Texas

February 23, 2018

EX-23.2

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form S‑3 (No. 333-202378) of Noble Corporation of our report dated February 23, 2018 relating to the consolidated financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

Houston, Texas

February 23, 2018

EX-31.1

EXHIBIT 31.1

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales

Noble Corporation, a Cayman Islands company

I, Julie J. Robertson, certify that:

1. I have reviewed this annual report on Form 10-K of Noble Corporation plc and Noble Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Julie J. Robertson	February 23, 2018
Julie J. Robertson	Date
Chairman, President and Chief Executive Officer of Noble Corporation plc, a public limited company incorporated under the laws of England and Wales, and President and Chief Executive Officer of Noble Corporation, a Cayman Islands company

EX-31.2

EXHIBIT 31.2

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales

I, Adam C. Peakes, certify that:

1. I have reviewed this annual report on Form 10-K of Noble Corporation plc ;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Adam C. Peakes	February 23, 2018
Adam C. Peakes	Date
Senior Vice President and Chief Financial Officer of Noble Corporation plc, a public limited company incorporated under the laws of England and Wales

EX-31.3

EXHIBIT 31.3

Noble Corporation, a Cayman Islands company

I, Thomas B Sloan Jr., certify that:

1. I have reviewed this annual report on Form 10-K of Noble Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/  Thomas B Sloan Jr.	February 23, 2018
Thomas B Sloan Jr.	Date
Vice President and Chief Financial Officer of Noble Corporation, a Cayman Islands company

EX-32.1

EXHIBIT 32.1

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales

Noble Corporation, a Cayman Islands company

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), and Noble Corporation, a Cayman Islands company (“Noble-Cayman”) on Form 10-K for the period ended December 31, 2017, as filed with the United States Securities and Exchange Commission on the date hereof (the “Report”), I, Julie J. Robertson, Chairman, President and Chief Executive Officer of Noble-UK and President and Chief Executive Officer of Noble-Cayman, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

February 23, 2018	/s/ Julie J. Robertson
	Julie J. Robertson
	Chairman, President and Chief Executive Officer of Noble Corporation plc, a public limited company incorporated under the laws of England and Wales, and President and Chief Executive Officer of Noble Corporation, a Cayman Islands company

EX-32.2

EXHIBIT 32.2

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Noble Corporation plc (the “Company”) on Form 10-K for the period ended December 31, 2017, as filed with the United States Securities and Exchange Commission on the date hereof (the “Report”), I, Adam C. Peakes, Senior Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

February 23, 2018	/s/ Adam C. Peakes
	Adam C. Peakes
	Senior Vice President and Chief Financial Officer of Noble Corporation plc, a public limited company incorporated under the laws of England and Wales

EX-32.3

EXHIBIT 32.3

Noble Corporation, a Cayman Islands company

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Noble Corporation (the “Company”) on Form 10-K for the period ended December 31, 2017, as filed with the United States Securities and Exchange Commission on the date hereof (the “Report”), I, Thomas B Sloan, Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

February 23, 2018	/s/ Thomas B Sloan Jr.
	Thomas B Sloan Jr.
	Vice President and Chief Financial Officer of Noble Corporation, a Cayman Islands company

XML

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Feb. 20, 2018	Jun. 30, 2017
Document Information [Line Items]
Entity Registrant Name	Noble Corp plc
Trading Symbol	NE
Entity Central Index Key	0001458891
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		244,776,217
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 876.0
Noble Corp
Document Information [Line Items]
Entity Registrant Name	Noble Corporation
Entity Central Index Key	0001169055
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		261,245,693

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 662,829	$ 725,722
Accounts receivable, net	204,696	319,152
Taxes receivable	105,345	55,480
Prepaid expenses and other current assets	66,105	92,260
Total current assets	1,038,975	1,192,614
Property and equipment, at cost	12,034,331	12,364,888
Accumulated depreciation	(2,545,091)	(2,302,940)
Property and equipment, net	9,489,240	10,061,948
Other assets	266,444	185,555
Total assets	10,794,659	11,440,117
Current liabilities
Current maturities of long-term debt	249,843	299,882
Accounts payable	84,032	108,224
Accrued payroll and related costs	54,904	48,383
Taxes payable	34,391	46,561
Interest payable	98,189	61,299
Other current liabilities	71,665	68,944
Total current liabilities	593,024	633,293
Long-term debt	3,795,867	4,040,229
Deferred income taxes	164,962	2,084
Other liabilities	290,178	297,066
Total liabilities	4,844,031	4,972,672
Commitments and contingencies (Note 14)
Shareholders' equity
Common stock	2,450	2,432
Additional paid-in capital	678,922	654,168
Retained earnings	4,637,677	5,154,221
Accumulated other comprehensive loss	(42,888)	(52,140)
Total shareholders' equity	5,276,161	5,758,681
Noncontrolling interests	674,467	708,764
Total equity	5,950,628	6,467,445
Total liabilities and equity	10,794,659	11,440,117
Noble Corp
Current assets
Cash and cash equivalents	662,011	653,833
Accounts receivable, net	204,696	319,152
Taxes receivable	105,345	55,480
Prepaid expenses and other current assets	65,441	88,749
Total current assets	1,037,493	1,117,214
Property and equipment, at cost	12,034,331	12,364,888
Accumulated depreciation	(2,545,091)	(2,302,940)
Property and equipment, net	9,489,240	10,061,948
Other assets	266,528	178,552
Total assets	10,793,261	11,357,714
Current liabilities
Current maturities of long-term debt	249,843	299,882
Accounts payable	83,873	107,868
Accrued payroll and related costs	54,904	48,319
Taxes payable	33,965	46,561
Interest payable	98,189	61,299
Other current liabilities	71,466	67,312
Total current liabilities	592,240	631,241
Long-term debt	3,795,867	4,040,229
Deferred income taxes	164,962	2,084
Other liabilities	290,178	292,183
Total liabilities	4,843,247	4,965,737
Commitments and contingencies (Note 14)
Shareholders' equity
Common stock	26,125	26,125
Additional paid-in capital	623,137	594,091
Retained earnings	4,669,173	5,115,137
Accumulated other comprehensive loss	(42,888)	(52,140)
Total shareholders' equity	5,275,547	5,683,213
Noncontrolling interests	674,467	708,764
Total equity	5,950,014	6,391,977
Total liabilities and equity	$ 10,793,261	$ 11,357,714

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Dec. 31, 2017	Dec. 31, 2016
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Ordinary shares, shares outstanding	244,971	243,239
Noble Corp
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Ordinary shares, shares outstanding	261,246	261,246

XML

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating revenues
Contract drilling services	$ 1,207,026	$ 2,242,200	$ 3,261,610
Reimbursables and other	29,889	59,865	90,642
Total operating revenues	1,236,915	2,302,065	3,352,252
Operating costs and expenses
Contract drilling services	640,489	879,438	1,232,529
Reimbursables	18,435	45,499	70,276
Depreciation and amortization	547,990	611,067	634,305
General and administrative	71,634	69,258	76,843
Loss on impairment	121,639	1,458,749	418,298
Total operating costs and expenses	1,400,187	3,064,011	2,432,251
Operating income (loss)	(163,272)	(761,946)	920,001
Other income (expense)
Interest expense, net of amount capitalized	(291,989)	(222,915)	(213,854)
Gain on extinguishment of debt, net	0	17,814	0
Interest income and other, net	5,449	18	36,286
Income (loss) from continuing operations before income taxes	(449,812)	(967,029)	742,433
Income tax benefit (provision)	(42,629)	109,156	(159,232)
Net income (loss) from continuing operations	(492,441)	(857,873)	583,201
Net income (loss) from discontinued operations, net of tax	(1,486)	0	0
Net income (loss)	(493,927)	(857,873)	583,201
Net (income) attributable to noncontrolling interests	(22,584)	(71,707)	(72,201)
Net income (loss) attributable to the company	(516,511)	(929,580)	511,000
Income (loss) from continuing operations	(515,025)	(929,580)	511,000
Net loss from discontinued operations, net of tax	(1,486)	0	0
Net income (loss) attributable to the company	$ (516,511)	$ (929,580)	$ 511,000
Basic:
Income (loss) from continuing operations (usd per share)	$ (2.10)	$ (3.82)	$ 2.06
Loss from discontinued operations (usd per share)	(0.01)	0.00	0.00
Net income (loss) (usd per share)	(2.11)	(3.82)	2.06
Diluted:
Income (loss) from continuing operations (usd per share)	(2.10)	(3.82)	2.06
Loss from discontinued operations (usd per share)	(0.01)	0.00	0.00
Net income (loss) (usd per share)	$ (2.11)	$ (3.82)	$ 2.06
Weighted- Average Shares Outstanding
Basic (in shares)	244,743	243,127	242,146
Diluted (in shares)	244,743	243,127	247,402
Noble Corp
Operating revenues
Contract drilling services	$ 1,207,026	$ 2,242,200	$ 3,261,610
Reimbursables and other	29,889	60,565	90,842
Total operating revenues	1,236,915	2,302,765	3,352,452
Operating costs and expenses
Contract drilling services	638,035	873,661	1,226,377
Reimbursables	18,435	45,499	70,276
Depreciation and amortization	543,119	611,013	633,244
General and administrative	41,087	46,045	55,435
Loss on impairment	121,639	1,458,749	418,298
Total operating costs and expenses	1,362,315	3,034,967	2,403,630
Operating income (loss)	(125,400)	(732,202)	948,822
Other income (expense)
Interest expense, net of amount capitalized	(291,989)	(222,915)	(213,854)
Gain on extinguishment of debt, net	0	17,814	0
Interest income and other, net	5,285	133	34,664
Income (loss) from continuing operations before income taxes	(412,104)	(937,170)	769,632
Income tax benefit (provision)	(42,595)	109,163	(162,620)
Net income (loss) from continuing operations	(454,699)	(828,007)	607,012
Net income (loss) from discontinued operations, net of tax	2,967	0	0
Net income (loss)	(451,732)	(828,007)	607,012
Net (income) attributable to noncontrolling interests	(22,584)	(71,707)	(72,201)
Net income (loss) attributable to the company	(474,316)	(899,714)	534,811
Net income (loss) attributable to the company	$ (474,316)	$ (899,714)	$ 534,811

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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income (loss)	$ (493,927)	$ (857,873)	$ 583,201
Other comprehensive income (loss)
Foreign currency translation adjustments	990	(19)	(5,278)
Net pension plan gain (loss) (net of tax provision (benefit) of $523, ($1,828) and $4,021 for the year ended December 31, 2017, 2016 and 2015, respectively)	6,774	(8,237)	7,099
Amortization of deferred pension plan amounts (net of tax provision of $623, $1,635 and $2,297 for the year ended December 31, 2017, 2016 and 2015, respectively)	1,393	3,127	4,422
Net pension plan curtailment and settlement expense (net of tax provision of zero, $7,218 and zero for the year ended December 31, 2017, 2016 and 2015, respectively)	95	15,216	0
Prior service cost arising during the period (net of tax provision of zero, $344 and zero for the year ended December 31, 2017, 2016 and 2015, respectively)	0	948	0
Other comprehensive income, net	9,252	11,035	6,243
Net comprehensive (income) attributable to noncontrolling interests	(22,584)	(71,707)	(72,201)
Comprehensive income (loss) attributable to the company	(507,259)	(918,545)	517,243
Noble Corp
Net income (loss)	(451,732)	(828,007)	607,012
Other comprehensive income (loss)
Foreign currency translation adjustments	990	(19)	(5,278)
Net pension plan gain (loss) (net of tax provision (benefit) of $523, ($1,828) and $4,021 for the year ended December 31, 2017, 2016 and 2015, respectively)	6,774	(8,237)	7,099
Amortization of deferred pension plan amounts (net of tax provision of $623, $1,635 and $2,297 for the year ended December 31, 2017, 2016 and 2015, respectively)	1,393	3,127	4,422
Net pension plan curtailment and settlement expense (net of tax provision of zero, $7,218 and zero for the year ended December 31, 2017, 2016 and 2015, respectively)	95	15,216	0
Prior service cost arising during the period (net of tax provision of zero, $344 and zero for the year ended December 31, 2017, 2016 and 2015, respectively)	0	948	0
Other comprehensive income, net	9,252	11,035	6,243
Net comprehensive (income) attributable to noncontrolling interests	(22,584)	(71,707)	(72,201)
Comprehensive income (loss) attributable to the company	$ (465,064)	$ (888,679)	$ 541,054

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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Benefit plans, before reclassifications, tax	$ 523	$ (1,828)	$ 4,021
Benefit plans, reclassification adjustments, tax	623	1,635	2,297
Benefit plans, settlement for curtailments, tax	0	7,218	0
Benefit plans, prior service costs, tax	0	344	0
Noble Corp
Benefit plans, reclassification adjustments, tax	$ 623	$ 1,635	$ 2,297

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income (loss)	$ (493,927)	$ (857,873)	$ 583,201
Adjustments to reconcile net income to net cash flow from operating activities:
Depreciation and amortization	547,990	611,067	634,305
Loss on impairment	121,639	1,458,749	418,298
Gain on extinguishment of debt, net	0	(17,814)	0
Deferred income taxes	241,326	(189,897)	(36,172)
Amortization of share-based compensation	29,115	34,720	39,172
Other long-term asset write-off	29,032	0	0
Net change in other assets and liabilities	(21,237)	87,124	126,103
Net cash provided by operating activities	453,938	1,126,076	1,764,907
Cash flows from investing activities
Capital expenditures	(111,140)	(659,925)	(422,544)
Change in accrued capital expenditures	(46,830)	(34,814)	(14,607)
Proceeds from disposal of assets	2,382	24,808	4,614
Net cash used in investing activities	(155,588)	(669,931)	(432,537)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	0	0	(1,123,495)
Issuance of senior notes	0	980,100	1,092,728
Repayments of debt	(300,000)	(1,049,338)	(350,000)
Debt issuance costs on senior notes and credit facility	(42)	(12,111)	(16,070)
Dividend payments	0	(47,534)	(315,534)
Dividends paid to noncontrolling interests	(56,881)	(85,944)	(71,504)
Repurchases of shares	0	0	(100,630)
Tender offer premium	0	(24,649)	0
Employee stock transactions	(4,320)	(3,192)	(4,130)
Net cash used in financing activities	(361,243)	(242,668)	(888,635)
Net increase (decrease) in cash and cash equivalents	(62,893)	213,477	443,735
Cash and cash equivalents, beginning of period	725,722	512,245	68,510
Cash and cash equivalents, end of period	662,829	725,722	512,245
Noble Corp
Cash flows from operating activities
Net income (loss)	(451,732)	(828,007)	607,012
Adjustments to reconcile net income to net cash flow from operating activities:
Depreciation and amortization	543,119	611,013	633,244
Loss on impairment	121,639	1,458,749	418,298
Gain on extinguishment of debt, net	0	(17,814)	0
Deferred income taxes	241,326	(189,897)	(34,108)
Capital contribution by parent - share-based compensation	29,046	32,782	30,652
Other long-term asset write-off	29,030	0	0
Net change in other assets and liabilities	(20,091)	89,445	92,409
Net cash provided by operating activities	492,337	1,156,271	1,747,507
Cash flows from investing activities
Capital expenditures	(111,140)	(659,925)	(422,544)
Change in accrued capital expenditures	(46,830)	(34,814)	(14,607)
Proceeds from disposal of assets	2,382	24,808	4,614
Net cash used in investing activities	(155,588)	(669,931)	(432,537)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	0	0	(1,123,495)
Issuance of senior notes	0	980,100	1,092,728
Repayments of debt	(300,000)	(1,049,338)	(350,000)
Debt issuance costs on senior notes and credit facility	(42)	(12,111)	(16,070)
Dividends paid to noncontrolling interests	(56,881)	(85,944)	(71,504)
Tender offer premium	0	(24,649)	0
Contributions (distributions) from (to) parent company, net	28,352
Contributions (distributions) from (to) parent company, net		(152,360)	(400,614)
Net cash used in financing activities	(328,571)	(344,302)	(868,955)
Net increase (decrease) in cash and cash equivalents	8,178	142,038	446,015
Cash and cash equivalents, beginning of period	653,833	511,795	65,780
Cash and cash equivalents, end of period	$ 662,011	$ 653,833	$ 511,795

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Consolidated Statements of Equity - USD ($) $ in Thousands		Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Noble Corp	Noble Corp Common Stock	Noble Corp Capital in Excess of Par Value	Noble Corp Retained Earnings	Noble Corp Accumulated Other Comprehensive Income (Loss)	Noble Corp Noncontrolling Interests
Beginning balance at Dec. 31, 2014		$ 7,287,034	$ 2,475	$ 695,638	$ 5,936,035	$ (69,418)	$ 722,304	$ 7,218,782	$ 26,125	$ 530,657	$ 6,009,114	$ (69,418)	$ 722,304
Beginning Balance, Shares at Dec. 31, 2014			247,501,000						261,246,000
Employee related equity activity
Amortization of share-based compensation		39,172		39,172
Issuance of share-based compensation shares		(4,171)	$ 7	(4,178)
Issuance of share-based compensation shares, Shares			685,000
Tax benefit of equity transactions		$ (1,581)		(1,581)
Repurchases of shares, Shares		(6,200,000)	(6,209,000)
Repurchases of shares		$ (100,630)	$ (62)	(100,568)
Distributions to parent company, net								(376,714)			(376,714)
Capital contribution by parent - share- based compensation								30,652		30,652
Net income (loss)		583,201			511,000		72,201	607,012			534,811	0	72,201
Dividends paid to noncontrolling interests		(71,504)					(71,504)	(71,504)				0	(71,504)
Dividends equivalents		(315,534)			(315,534)
Other comprehensive income, net		6,243				6,243		6,243				6,243	0
Ending Balance at Dec. 31, 2015		7,422,230	$ 2,420	628,483	6,131,501	(63,175)	723,001	7,414,471	$ 26,125	561,309	6,167,211	(63,175)	723,001
Ending Balance, Shares at Dec. 31, 2015			241,977,000						261,246,000
Employee related equity activity
Amortization of share-based compensation		34,720		34,720
Issuance of share-based compensation shares		(3,613)	$ 12	(3,625)
Issuance of share-based compensation shares, Shares			1,262,000
Tax benefit of equity transactions		$ (5,410)		(5,410)
Repurchases of shares, Shares		0
Distributions to parent company, net								(152,360)			(152,360)
Capital contribution by parent - share- based compensation								32,782		32,782
Net income (loss)		$ (857,873)			(929,580)		71,707	(828,007)			(899,714)		71,707
Dividends paid to noncontrolling interests		(85,944)					(85,944)	(85,944)					(85,944)
Dividends equivalents		(47,700)			(47,700)
Other comprehensive income, net		11,035				11,035		11,035				11,035
Ending Balance at Dec. 31, 2016		$ 6,467,445	$ 2,432	654,168	5,154,221	(52,140)	708,764	$ 6,391,977	$ 26,125	594,091	5,115,137	(52,140)	708,764
Ending Balance, Shares at Dec. 31, 2016		243,239,000	243,239,000					261,246,000	261,246,000
Employee related equity activity
Amortization of share-based compensation		$ 29,115		29,115
Issuance of share-based compensation shares		(5)	$ 18	(23)
Issuance of share-based compensation shares, Shares			1,732,000
Shares withheld for taxes on equity transactions		$ (4,338)		(4,338)
Repurchases of shares, Shares		0
Contributions from parent company, net								$ 28,352			28,352
Capital contribution by parent - share- based compensation								29,046		29,046
Net income (loss)		$ (493,927)			(516,511)		22,584	(451,732)			(474,316)		22,584
Dividends paid to noncontrolling interests		(56,881)					(56,881)	(56,881)					(56,881)
Dividends equivalents	[1]	(33)			(33)
Other comprehensive income, net		9,252				9,252		9,252				9,252
Ending Balance at Dec. 31, 2017		$ 5,950,628	$ 2,450	$ 678,922	$ 4,637,677	$ (42,888)	$ 674,467	$ 5,950,014	$ 26,125	$ 623,137	$ 4,669,173	$ (42,888)	$ 674,467
Ending Balance, Shares at Dec. 31, 2017		244,971,000	244,971,000					261,246,000	261,246,000

[1] Activity associated with dividend equivalents, which are related to 2016 performance awards to be paid upon vesting.

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Organization and Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Significant Accounting Policies

Note 1— Organization and Significant Accounting Policies

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), is a leading offshore drilling contractor for the oil and gas industry. We provide contract drilling services with our global fleet of mobile offshore drilling units. As of December 31, 2017, our fleet consisted of eight drillships, six semisubmersibles and 14 jackups.

We report our contract drilling operations as a single reportable segment, Contract Drilling Services, which reflects how we manage our business. The mobile offshore drilling units comprising our offshore rig fleet operate in a global market for contract drilling services and are often redeployed to different regions due to changing demands of our customers, which consist primarily of large, integrated, independent and government-owned or controlled oil and gas companies throughout the world.

Noble Corporation, a Cayman Islands company (“Noble-Cayman”), is an indirect, wholly-owned subsidiary of Noble-UK, our publicly-traded parent company. Noble-UK’s principal asset is all of the shares of Noble-Cayman. Noble-Cayman has no public equity outstanding. The consolidated financial statements of Noble-UK include the accounts of Noble-Cayman, and Noble-UK conducts substantially all of its business through Noble-Cayman and its subsidiaries.

Principles of Consolidation

The consolidated financial statements include our accounts, those of our wholly-owned subsidiaries and entities in which we hold a controlling financial interest. Our consolidated financial statements also include the accounts of two joint ventures, in each of which we own a 50 percent interest. Our ownership interest meets the definition of variable interest under Financial Accounting Standards Board (“FASB”) codification and we have determined that we are the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.

The combined carrying amount of the Bully-class drillships at December 31, 2017 and 2016 totaled $1.3 billion and $1.4 billion, respectively. These assets were primarily funded through partner equity contributions. Cash held by the Bully joint ventures totaled approximately $41.6 million at December 31, 2017 as compared to approximately $34.7 million at December 31, 2016.

Prior Period Reclassification

We have made certain reclassifications to our prior period amounts in our operating revenue on our Consolidated Statements of Operations by combining our other revenue with reimbursables revenue to conform to the current period presentation. Such reclassification did not have a material effect on our results of operations and had no effect on our financial position or cash flows.

We have made certain reclassifications to our prior period amounts in our operating and investing sections on our Consolidated Statements of Cash Flows in accordance with ASU No. 2016-9, which amends ASC Topic 718, “Compensation— Stock Compensation.” See “— Accounting Pronouncements” below.

Foreign Currency Translation

Although we are a UK company, our functional currency is the U.S. dollar, and we define any non-U.S. dollar denominated currency as “foreign currencies”. In non-U.S. locations where the U.S. Dollar has been designated as the functional currency (based on an evaluation of factors including the markets in which the subsidiary operates, inflation, generation of cash flow, financing activities and intercompany arrangements), local currency transaction gains and losses are included in net income or loss. In non-U.S. locations where the local currency is the functional currency, assets and liabilities are translated at the rates of exchange on the balance sheet date, while statement of operations items are translated at average rates of exchange during the year. The resulting gains or losses arising from the translation of accounts from the functional currency to the U.S. Dollar are included in “Accumulated other comprehensive loss” in the Consolidated Balance Sheets. We did not recognize any material gains or losses on foreign currency transactions or translations during the three years ended December 31, 2017.

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, demand deposits with banks and all highly liquid investments with original maturities of three months or less. Our cash, cash equivalents and short-term investments are subject to potential credit risk, and certain of our cash accounts carry balances greater than the federally insured limits. Cash and cash equivalents are primarily held by major banks or investment firms. Our cash management and investment policies restrict investments to lower risk, highly liquid securities and we perform periodic evaluations of the relative credit standing of the financial institutions with which we conduct business.

Accounts Receivable

We record accounts receivable at the amount we invoice our clients, net of allowance for doubtful accounts. We provide an allowance for uncollectible accounts, as necessary. Our allowance for doubtful accounts as of December 31, 2017 and 2016 was $20.8 million, respectively.

Property and Equipment

Property and equipment is stated at cost, reduced by provisions to recognize economic impairment. Major replacements and improvements are capitalized. When assets are sold, retired or otherwise disposed of, the cost and related accumulated depreciation are eliminated from the accounts and the gain or loss is recognized. Drilling equipment and facilities are depreciated using the straight-line method over their estimated useful lives as of the date placed in service or date of major refurbishment. Estimated useful lives of our drilling equipment range from three to thirty years. Other property and equipment is depreciated using the straight-line method over useful lives ranging from two to forty years. Included in accounts payable were $21.0 million and $25.8 million of capital accruals as of December 31, 2017 and 2016, respectively.

Interest is capitalized on long-term construction project using the weighted average cost of debt outstanding during the period of construction.

Scheduled maintenance of equipment is performed based on the number of hours operated in accordance with our preventative maintenance program. Routine repair and maintenance costs are charged to expense as incurred; however, the costs of the overhauls and asset replacement projects that benefit future periods and which typically occur every three to five years are capitalized when incurred and depreciated over an equivalent period. These overhauls and asset replacement projects are included in “Drilling equipment and facilities” in “Note 5— Property and Equipment.”

We evaluate property and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. For more detailed information, see “Note 6— Impairment.”

Fair Value Measurements

We measure certain of our assets and liabilities based on a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The three-level hierarchy, from highest to lowest level of observable inputs, are as follows:

Level 1 - Valuations based on quoted prices in active markets for identical assets;

Level 2 - Valuations based on observable inputs that do not meet the criteria for Level 1, including quoted prices in inactive markets and quoted prices in active markets for similar but not identical instruments; and

Level 3 - Valuations based on unobservable inputs.

Revenue Recognition

Our typical dayrate drilling contract revenue, excluding taxes or duty, require our performance of a variety of services for a specified period of time. We determine progress towards completion of the contract by measuring efforts expended and the cost of services required to perform under a drilling contract, as the basis for our revenue recognition. Revenues generated from our dayrate-basis drilling contracts and labor contracts are recognized on a per day basis as services are performed and begin upon the contract commencement, as defined under the specified drilling contract. Dayrate revenues are typically earned, and contract drilling expenses are typically incurred ratably over the term of our drilling contracts. We review and monitor our performance under our drilling contracts to confirm the basis for our revenue recognition. Revenues from bonuses are recognized when earned, and when collectability is reasonably assured.

In our dayrate drilling contracts, we typically receive compensation and incur costs for mobilization, equipment modification or other activities prior to the commencement of a contract. Any such compensation may be paid through a lump-sum payment or other daily compensation. Pre-contract compensation and costs are deferred until the contract commences. The deferred pre-contract compensation and costs are amortized, using the straight-line method, into income or loss over the term of the initial contract period, regardless of the activity taking place. This approach is consistent with the economics for which the parties have contracted. Once a contract commences, we may conduct various activities, including drilling and well bore related activities, rig maintenance and equipment installation, movement between well locations or other activities.

Deferred revenues from drilling contracts totaled $114.3 million and $134.4 million at December 31, 2017 and 2016, respectively. Such amounts are included in either “Other current liabilities” or “Other liabilities” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition. Related expenses deferred under drilling contracts totaled $55.7 million at December 31, 2017 as compared to $72.8 million at December 31, 2016 and are included in either “Prepaid expenses and other current assets,” “Other assets” or “Property and equipment, net” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

In April 2015, we agreed to contract dayrate reductions for five rigs working for Saudi Aramco. Given current market conditions and based on discussions with the customer, we do not expect the rates for the rigs currently working for Saudi Aramco to return to the original contract rates during the remaining contract terms. In accordance with accounting guidance, we are recognizing the rate reductions on a straight-line basis over the remaining life of these Saudi Aramco contracts. At December 31, 2017 and 2016, two of the five original rigs had revenues recorded in excess of billings as a result of this recognition which totaled $6.9 million and $17.9 million, respectively, and are included in either “Prepaid expenses and other current assets” or “Other assets” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

We record reimbursements from customers for “out-of-pocket” expenses as revenues and the related direct cost as operating expenses.

Income Taxes

Income taxes are based on the laws and rates in effect in the countries in which operations are conducted or in which we or our subsidiaries are considered resident for income tax purposes. In certain circumstances, we expect that, due to changing demands of the offshore drilling markets and the ability to redeploy our offshore drilling units, certain of such units will not reside in a location long enough to give rise to future tax consequences. As a result, no deferred tax asset or liability has been recognized in these circumstances. Should our expectations change regarding the length of time an offshore drilling unit will be used in a given location, we will adjust deferred taxes accordingly.

Deferred tax assets and liabilities are recognized for the anticipated future tax effects of temporary differences between the financial statement basis and the tax basis of our assets and liabilities using the applicable jurisdictional tax rates at year-end. A valuation allowance for deferred tax assets is recorded when it is more likely than not that the deferred tax asset will not be realized in a future period.

We operate through various subsidiaries in numerous countries throughout the world, including the United States. Consequently, we are subject to changes in tax laws, treaties or regulations or the interpretation or enforcement thereof in the U.S., UK or jurisdictions in which we or any of our subsidiaries operate or are resident. Our income tax expense is based upon our interpretation of the tax laws in effect in various countries at the time that the expense was incurred. If the U.S. Internal Revenue Service (“IRS”) or other taxing authorities do not agree with our assessment of the effects of such laws, treaties and regulations, this could have a material adverse effect on us including the imposition of a higher effective tax rate on our worldwide earnings or a reclassification of the tax impact of our significant corporate restructuring transactions. The company has adopted an accounting policy to look through the outside basis of partnerships and all other flow-through entities and exclude these from the computation of deferred taxes.

On December 22, 2017, the President of the United States signed The Act into law. The Act represents major tax reform legislation that, among other provisions, reduces the U.S. corporate tax rate. The Company recognized the income tax effects of the Act in its 2017 financial statements, including $109.0 million of tax benefit recorded principally due to the write-down of our net deferred tax liabilities, in accordance with Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, in the reporting period in which the Act was enacted. Based on guidance issued from Staff Accounting Bulletin No. 118 ("SAB 118"), the Company has not provided provisional estimates for items in which the accounting for certain income tax effects of the Act is incomplete and as such, the Company will continue to apply ASC 740 on the basis of the laws in effect immediately before the enactment of the Act. See “Note 10— Income Taxes,” for further information on the financial statement impact of the Act.

The Act introduces a new anti-deferral provision, which subjects a U.S. parent shareholder to current tax on certain income referred to as Global Intangible Low-Taxed Income (“GILTI”), of its foreign subsidiaries. The company has not made any adjustments related to potential GILTI tax in its financial statements and has adopted a policy to treat tax due on future U.S. inclusions in taxable income as period costs when incurred.

Insurance Reserves

We maintain various levels of self-insured retention for certain losses including property damage, loss of hire, employment practices liability, employers’ liability and general liability, among others. We accrue for property damage and loss of hire charges on a per event basis.

Employment practices liability claims are accrued based on actual claims during the year. Maritime employer’s liability claims are generally estimated using actuarial determinations. General liability claims are estimated by our internal claims department by evaluating the facts and circumstances of each claim (including incurred but not reported claims) and making estimates based upon historical experience with similar claims. At December 31, 2017 and 2016, loss reserves for personal injury and protection claims totaled $22.0 million and $22.1 million, respectively, and such amounts are included in “Other current liabilities” in the accompanying Consolidated Balance Sheets.

Earnings per Share

Our unvested share-based payment awards, which contain non-forfeitable rights to dividends, are participating securities and are included in the computation of earnings per share pursuant to the two-class method. The two-class method allocates undistributed earnings between common shares and participating securities. The diluted earnings per share calculation under the two-class method also includes the dilutive effect of potential shares issued in connection with stock options. The dilutive effect of stock options is determined using the treasury stock method.

Share-Based Compensation Plans

We record the grant date fair value of share-based compensation arrangements as compensation cost using a straight-line method over the service period. Share-based compensation is expensed or capitalized based on the nature of the employee’s activities.

Discontinued Operations

On August 1, 2014, Noble-UK completed the separation and spin-off of a majority of its standard specification offshore drilling business through a pro rata distribution of all of the ordinary shares of its wholly-owned subsidiary, Paragon Offshore, to the holders of Noble’s ordinary shares (the “Spin-off”). Paragon Offshore, which had been reflected as continuing operations in our consolidated financial statements prior to the Spin-off, meets the criteria for being reported as discontinued operations and has been reclassified as such in our results of operations.

Prior to the completion of the Spin-off, Noble-UK and Paragon Offshore entered into certain separation agreements to effect the separation and Spin-off of Paragon Offshore and govern the relationship between the parties after the Spin-off (the “Separation Agreements”), including the Master Service Agreement (the “MSA”), and the Tax Sharing Agreement (the “TSA”). During the year ended December 31, 2017, we recorded a non-cash loss of $1.5 million in “Net loss from discontinued operations, net of tax” on our Consolidated Statement of Operations from the effects of Paragon Offshore's rejection of the Separation Agreements. For additional information related to the Paragon Spin-off, refer to “Note 14— Commitments and Contingencies.”

Certain Significant Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Certain accounting policies involve judgments and uncertainties to such an extent that there is reasonable likelihood that materially different amounts could have been reported under different conditions, or if different assumptions had been used. We evaluate our estimates and assumptions on a regular basis. We base our estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates and assumptions used in preparation of our consolidated financial statements.

Accounting Pronouncements

Accounting Standards Adopted

In March 2016, the FASB issued ASU No. 2016-9, which amends ASC Topic 718, “Compensation – Stock Compensation.” This amendment simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. This standard is effective for interim and annual reporting periods beginning after December 31, 2016 and we adopted the standard as of January 1, 2017. Under the new provision, current period excess tax benefits related to stock compensation are now recognized in our Consolidated Statement of Operations in “Provision for income taxes,” rather than on our Consolidated Balance Sheet and Consolidated Statement of Cash Flows. This update has been applied on a prospective basis. Changes to our Consolidated Statement of Cash Flows related to the reclassification of prior period excess tax benefits and employee taxes paid for share-based payment arrangements have been implemented on a retrospective basis. In accordance with our adoption of this update, prior period excess tax benefits of approximately $5.5 million and $1.6 million, previously classified as a financing activity in “Employee stock transactions” in the Consolidated Statement of Cash Flows for the year ended December 31, 2016 and 2015, respectively, are now classified as an operating activity in “Net change in other assets and liabilities” on the accompanying Consolidated Statement of Cash Flows for the comparative periods. Additionally, prior period employee taxes paid for share-based payment arrangements of approximately $3.2 million and $4.1 million, previously classified as an operating activity in “Net change in other assets and liabilities” in the Consolidated Statement of Cash Flows for the year ended December 31, 2016 and 2015, respectively, are now classified as a financing activity in “Employee stock transactions” on the accompanying Consolidated Statement of Cash Flows for the comparative periods.

Recently Issued Accounting Standards

In May 2014, the FASB issued ASU No. 2014-9, which creates Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers,” and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, ASU No. 2014-9 supersedes the cost guidance in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts,” and creates new Subtopic 340-40, “Other Assets and Deferred Costs—Contracts with Customers.” In summary, the core principle of Topic 606 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The amendments in ASU No. 2014-9 are effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period, and early application is permitted for periods beginning after December 15, 2016. We have formed an implementation work team, completed training on ASC Topic 606 and are finishing a project to review relevant contracts. We have adopted the new standard effective January 1,2018under the modified retrospective approach.With respect to our revenue recognized, as of December 31, 2017, we have qualitatively assessed that the effect of adoption will have an impact to deferred revenues in either “Other current liabilities” or “Other liabilities”, to revenues recorded in excess of billings recorded in “Prepaid expenses and other current assets,” and the net impact recorded to “Retained earnings” on our accompanying Consolidated Balance Sheets. Quantitatively, we estimate that the effect of our retrospective adoption will be immaterial. Therefore, with respect to our modified retrospective adoption, we do not anticipate a change to our financial presentation on our Consolidated Balance Sheets as of December 31, 2017.

In February 2016, the FASB issued ASU No. 2016-2, which creates ASC Topic 842, “Leases.” This update increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. Our adoption, and the ultimate effect on our consolidated financial statements, will be based on an evaluation of the contract-specific facts and circumstances. We expect to adopt ASC 842 effective January 1, 2019. We expect to apply the modified retrospective approach to our adoption. Our adoption will have an impact on how our consolidated financial statements and related disclosures will be presented. With respect to leases whereby we are the lessee, we are currently expecting to recognize lease liabilities and offsetting “right of use” assets upon adoption. We are currently evaluating any other impacts ASC 842, including any newly issued guidance, will have on our consolidated financial statements and related disclosures. To facilitate that evaluation, we have completed training on the ASU, formed an implementation team and started the review and documentation of contracts.

In October 2016, the FASB issued ASU No. 2016-16 which amends ASC Topic 740, “Income Taxes.” The amendments in this update improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This standard is effective for interim and annual reporting periods beginning after December 15, 2017 and will be applied on a modified retrospective basis. As a result of the modified retrospective application, we will reduce “Other assets” in our Consolidated Balance Sheet with a cumulative adjustment to retained earnings of approximately $148.0 million as of January 1, 2018.

In February 2017, the FASB issued ASU No. 2017-6, which amends ASC Topic 960, “Defined Benefit Pension Plans,” ASC Topic 962, “Defined Contribution Pension Plans” and ASC Topic 965, “Health and Welfare Benefit Plans.” The amendments in this update clarify presentation requirements for an employee benefit plan’s interest in a master trust and require more detailed disclosures of the plan’s interest in the master trust. The amendments also eliminate a redundancy relating to 401(h) account disclosures. This standard is effective for fiscal years beginning after December 15, 2018, with early application permitted. We are evaluating what impact, if any, the adoption of this guidance will have on our financial condition, results of operations, cash flows or financial disclosures.

In February 2018, the FASB issued ASU No. 2018-2, which amends ASC Topic 220, “Income Statement—Reporting Comprehensive Income.” The amendments in this update allow for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Act. This standard is effective for interim and annual reporting periods beginning after December 15, 2018; however, we expect to early adopt ASC 220 effective January 1, 2018. The amendment should be applied on a retrospective basis to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Act is recognized. As a result of the retrospective application, we will reduce “Accumulated Other Comprehensive Income” with a cumulative adjustment to “Retained Earnings” of approximately $5.5 million as of January 1, 2018.

With the exception of the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our consolidated financial statements.

Note 1— Organization and Significant Accounting Policies

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), is a leading offshore drilling contractor for the oil and gas industry. We provide contract drilling services with our global fleet of mobile offshore drilling units. As of December 31, 2017, our fleet consisted of eight drillships, six semisubmersibles and 14 jackups.

We report our contract drilling operations as a single reportable segment, Contract Drilling Services, which reflects how we manage our business. The mobile offshore drilling units comprising our offshore rig fleet operate in a global market for contract drilling services and are often redeployed to different regions due to changing demands of our customers, which consist primarily of large, integrated, independent and government-owned or controlled oil and gas companies throughout the world.

Noble Corporation, a Cayman Islands company (“Noble-Cayman”), is an indirect, wholly-owned subsidiary of Noble-UK, our publicly-traded parent company. Noble-UK’s principal asset is all of the shares of Noble-Cayman. Noble-Cayman has no public equity outstanding. The consolidated financial statements of Noble-UK include the accounts of Noble-Cayman, and Noble-UK conducts substantially all of its business through Noble-Cayman and its subsidiaries.

Principles of Consolidation

The consolidated financial statements include our accounts, those of our wholly-owned subsidiaries and entities in which we hold a controlling financial interest. Our consolidated financial statements also include the accounts of two joint ventures, in each of which we own a 50 percent interest. Our ownership interest meets the definition of variable interest under Financial Accounting Standards Board (“FASB”) codification and we have determined that we are the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.

The combined carrying amount of the Bully-class drillships at December 31, 2017 and 2016 totaled $1.3 billion and $1.4 billion, respectively. These assets were primarily funded through partner equity contributions. Cash held by the Bully joint ventures totaled approximately $41.6 million at December 31, 2017 as compared to approximately $34.7 million at December 31, 2016.

Prior Period Reclassification

We have made certain reclassifications to our prior period amounts in our operating revenue on our Consolidated Statements of Operations by combining our other revenue with reimbursables revenue to conform to the current period presentation. Such reclassification did not have a material effect on our results of operations and had no effect on our financial position or cash flows.

We have made certain reclassifications to our prior period amounts in our operating and investing sections on our Consolidated Statements of Cash Flows in accordance with ASU No. 2016-9, which amends ASC Topic 718, “Compensation— Stock Compensation.” See “— Accounting Pronouncements” below.

Foreign Currency Translation

Although we are a UK company, our functional currency is the U.S. dollar, and we define any non-U.S. dollar denominated currency as “foreign currencies”. In non-U.S. locations where the U.S. Dollar has been designated as the functional currency (based on an evaluation of factors including the markets in which the subsidiary operates, inflation, generation of cash flow, financing activities and intercompany arrangements), local currency transaction gains and losses are included in net income or loss. In non-U.S. locations where the local currency is the functional currency, assets and liabilities are translated at the rates of exchange on the balance sheet date, while statement of operations items are translated at average rates of exchange during the year. The resulting gains or losses arising from the translation of accounts from the functional currency to the U.S. Dollar are included in “Accumulated other comprehensive loss” in the Consolidated Balance Sheets. We did not recognize any material gains or losses on foreign currency transactions or translations during the three years ended December 31, 2017.

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, demand deposits with banks and all highly liquid investments with original maturities of three months or less. Our cash, cash equivalents and short-term investments are subject to potential credit risk, and certain of our cash accounts carry balances greater than the federally insured limits. Cash and cash equivalents are primarily held by major banks or investment firms. Our cash management and investment policies restrict investments to lower risk, highly liquid securities and we perform periodic evaluations of the relative credit standing of the financial institutions with which we conduct business.

Accounts Receivable

We record accounts receivable at the amount we invoice our clients, net of allowance for doubtful accounts. We provide an allowance for uncollectible accounts, as necessary. Our allowance for doubtful accounts as of December 31, 2017 and 2016 was $20.8 million, respectively.

Property and Equipment

Property and equipment is stated at cost, reduced by provisions to recognize economic impairment. Major replacements and improvements are capitalized. When assets are sold, retired or otherwise disposed of, the cost and related accumulated depreciation are eliminated from the accounts and the gain or loss is recognized. Drilling equipment and facilities are depreciated using the straight-line method over their estimated useful lives as of the date placed in service or date of major refurbishment. Estimated useful lives of our drilling equipment range from three to thirty years. Other property and equipment is depreciated using the straight-line method over useful lives ranging from two to forty years. Included in accounts payable were $21.0 million and $25.8 million of capital accruals as of December 31, 2017 and 2016, respectively.

Interest is capitalized on long-term construction project using the weighted average cost of debt outstanding during the period of construction.

Scheduled maintenance of equipment is performed based on the number of hours operated in accordance with our preventative maintenance program. Routine repair and maintenance costs are charged to expense as incurred; however, the costs of the overhauls and asset replacement projects that benefit future periods and which typically occur every three to five years are capitalized when incurred and depreciated over an equivalent period. These overhauls and asset replacement projects are included in “Drilling equipment and facilities” in “Note 5— Property and Equipment.”

We evaluate property and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. For more detailed information, see “Note 6— Impairment.”

Fair Value Measurements

We measure certain of our assets and liabilities based on a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The three-level hierarchy, from highest to lowest level of observable inputs, are as follows:

Level 1 - Valuations based on quoted prices in active markets for identical assets;

Level 2 - Valuations based on observable inputs that do not meet the criteria for Level 1, including quoted prices in inactive markets and quoted prices in active markets for similar but not identical instruments; and

Level 3 - Valuations based on unobservable inputs.

Revenue Recognition

Our typical dayrate drilling contract revenue, excluding taxes or duty, require our performance of a variety of services for a specified period of time. We determine progress towards completion of the contract by measuring efforts expended and the cost of services required to perform under a drilling contract, as the basis for our revenue recognition. Revenues generated from our dayrate-basis drilling contracts and labor contracts are recognized on a per day basis as services are performed and begin upon the contract commencement, as defined under the specified drilling contract. Dayrate revenues are typically earned, and contract drilling expenses are typically incurred ratably over the term of our drilling contracts. We review and monitor our performance under our drilling contracts to confirm the basis for our revenue recognition. Revenues from bonuses are recognized when earned, and when collectability is reasonably assured.

In our dayrate drilling contracts, we typically receive compensation and incur costs for mobilization, equipment modification or other activities prior to the commencement of a contract. Any such compensation may be paid through a lump-sum payment or other daily compensation. Pre-contract compensation and costs are deferred until the contract commences. The deferred pre-contract compensation and costs are amortized, using the straight-line method, into income or loss over the term of the initial contract period, regardless of the activity taking place. This approach is consistent with the economics for which the parties have contracted. Once a contract commences, we may conduct various activities, including drilling and well bore related activities, rig maintenance and equipment installation, movement between well locations or other activities.

Deferred revenues from drilling contracts totaled $114.3 million and $134.4 million at December 31, 2017 and 2016, respectively. Such amounts are included in either “Other current liabilities” or “Other liabilities” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition. Related expenses deferred under drilling contracts totaled $55.7 million at December 31, 2017 as compared to $72.8 million at December 31, 2016 and are included in either “Prepaid expenses and other current assets,” “Other assets” or “Property and equipment, net” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

In April 2015, we agreed to contract dayrate reductions for five rigs working for Saudi Aramco. Given current market conditions and based on discussions with the customer, we do not expect the rates for the rigs currently working for Saudi Aramco to return to the original contract rates during the remaining contract terms. In accordance with accounting guidance, we are recognizing the rate reductions on a straight-line basis over the remaining life of these Saudi Aramco contracts. At December 31, 2017 and 2016, two of the five original rigs had revenues recorded in excess of billings as a result of this recognition which totaled $6.9 million and $17.9 million, respectively, and are included in either “Prepaid expenses and other current assets” or “Other assets” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

We record reimbursements from customers for “out-of-pocket” expenses as revenues and the related direct cost as operating expenses.

Income Taxes

Income taxes are based on the laws and rates in effect in the countries in which operations are conducted or in which we or our subsidiaries are considered resident for income tax purposes. In certain circumstances, we expect that, due to changing demands of the offshore drilling markets and the ability to redeploy our offshore drilling units, certain of such units will not reside in a location long enough to give rise to future tax consequences. As a result, no deferred tax asset or liability has been recognized in these circumstances. Should our expectations change regarding the length of time an offshore drilling unit will be used in a given location, we will adjust deferred taxes accordingly.

Deferred tax assets and liabilities are recognized for the anticipated future tax effects of temporary differences between the financial statement basis and the tax basis of our assets and liabilities using the applicable jurisdictional tax rates at year-end. A valuation allowance for deferred tax assets is recorded when it is more likely than not that the deferred tax asset will not be realized in a future period.

We operate through various subsidiaries in numerous countries throughout the world, including the United States. Consequently, we are subject to changes in tax laws, treaties or regulations or the interpretation or enforcement thereof in the U.S., UK or jurisdictions in which we or any of our subsidiaries operate or are resident. Our income tax expense is based upon our interpretation of the tax laws in effect in various countries at the time that the expense was incurred. If the U.S. Internal Revenue Service (“IRS”) or other taxing authorities do not agree with our assessment of the effects of such laws, treaties and regulations, this could have a material adverse effect on us including the imposition of a higher effective tax rate on our worldwide earnings or a reclassification of the tax impact of our significant corporate restructuring transactions. The company has adopted an accounting policy to look through the outside basis of partnerships and all other flow-through entities and exclude these from the computation of deferred taxes.

On December 22, 2017, the President of the United States signed The Act into law. The Act represents major tax reform legislation that, among other provisions, reduces the U.S. corporate tax rate. The Company recognized the income tax effects of the Act in its 2017 financial statements, including $109.0 million of tax benefit recorded principally due to the write-down of our net deferred tax liabilities, in accordance with Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, in the reporting period in which the Act was enacted. Based on guidance issued from Staff Accounting Bulletin No. 118 ("SAB 118"), the Company has not provided provisional estimates for items in which the accounting for certain income tax effects of the Act is incomplete and as such, the Company will continue to apply ASC 740 on the basis of the laws in effect immediately before the enactment of the Act. See “Note 10— Income Taxes,” for further information on the financial statement impact of the Act.

The Act introduces a new anti-deferral provision, which subjects a U.S. parent shareholder to current tax on certain income referred to as Global Intangible Low-Taxed Income (“GILTI”), of its foreign subsidiaries. The company has not made any adjustments related to potential GILTI tax in its financial statements and has adopted a policy to treat tax due on future U.S. inclusions in taxable income as period costs when incurred.

Insurance Reserves

We maintain various levels of self-insured retention for certain losses including property damage, loss of hire, employment practices liability, employers’ liability and general liability, among others. We accrue for property damage and loss of hire charges on a per event basis.

Employment practices liability claims are accrued based on actual claims during the year. Maritime employer’s liability claims are generally estimated using actuarial determinations. General liability claims are estimated by our internal claims department by evaluating the facts and circumstances of each claim (including incurred but not reported claims) and making estimates based upon historical experience with similar claims. At December 31, 2017 and 2016, loss reserves for personal injury and protection claims totaled $22.0 million and $22.1 million, respectively, and such amounts are included in “Other current liabilities” in the accompanying Consolidated Balance Sheets.

Earnings per Share

Our unvested share-based payment awards, which contain non-forfeitable rights to dividends, are participating securities and are included in the computation of earnings per share pursuant to the two-class method. The two-class method allocates undistributed earnings between common shares and participating securities. The diluted earnings per share calculation under the two-class method also includes the dilutive effect of potential shares issued in connection with stock options. The dilutive effect of stock options is determined using the treasury stock method.

Share-Based Compensation Plans

We record the grant date fair value of share-based compensation arrangements as compensation cost using a straight-line method over the service period. Share-based compensation is expensed or capitalized based on the nature of the employee’s activities.

Discontinued Operations

On August 1, 2014, Noble-UK completed the separation and spin-off of a majority of its standard specification offshore drilling business through a pro rata distribution of all of the ordinary shares of its wholly-owned subsidiary, Paragon Offshore, to the holders of Noble’s ordinary shares (the “Spin-off”). Paragon Offshore, which had been reflected as continuing operations in our consolidated financial statements prior to the Spin-off, meets the criteria for being reported as discontinued operations and has been reclassified as such in our results of operations.

Prior to the completion of the Spin-off, Noble-UK and Paragon Offshore entered into certain separation agreements to effect the separation and Spin-off of Paragon Offshore and govern the relationship between the parties after the Spin-off (the “Separation Agreements”), including the Master Service Agreement (the “MSA”), and the Tax Sharing Agreement (the “TSA”). During the year ended December 31, 2017, we recorded a non-cash loss of $1.5 million in “Net loss from discontinued operations, net of tax” on our Consolidated Statement of Operations from the effects of Paragon Offshore's rejection of the Separation Agreements. For additional information related to the Paragon Spin-off, refer to “Note 14— Commitments and Contingencies.”

Certain Significant Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Certain accounting policies involve judgments and uncertainties to such an extent that there is reasonable likelihood that materially different amounts could have been reported under different conditions, or if different assumptions had been used. We evaluate our estimates and assumptions on a regular basis. We base our estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates and assumptions used in preparation of our consolidated financial statements.

Accounting Pronouncements

Accounting Standards Adopted

In March 2016, the FASB issued ASU No. 2016-9, which amends ASC Topic 718, “Compensation – Stock Compensation.” This amendment simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. This standard is effective for interim and annual reporting periods beginning after December 31, 2016 and we adopted the standard as of January 1, 2017. Under the new provision, current period excess tax benefits related to stock compensation are now recognized in our Consolidated Statement of Operations in “Provision for income taxes,” rather than on our Consolidated Balance Sheet and Consolidated Statement of Cash Flows. This update has been applied on a prospective basis. Changes to our Consolidated Statement of Cash Flows related to the reclassification of prior period excess tax benefits and employee taxes paid for share-based payment arrangements have been implemented on a retrospective basis. In accordance with our adoption of this update, prior period excess tax benefits of approximately $5.5 million and $1.6 million, previously classified as a financing activity in “Employee stock transactions” in the Consolidated Statement of Cash Flows for the year ended December 31, 2016 and 2015, respectively, are now classified as an operating activity in “Net change in other assets and liabilities” on the accompanying Consolidated Statement of Cash Flows for the comparative periods. Additionally, prior period employee taxes paid for share-based payment arrangements of approximately $3.2 million and $4.1 million, previously classified as an operating activity in “Net change in other assets and liabilities” in the Consolidated Statement of Cash Flows for the year ended December 31, 2016 and 2015, respectively, are now classified as a financing activity in “Employee stock transactions” on the accompanying Consolidated Statement of Cash Flows for the comparative periods.

Recently Issued Accounting Standards

In May 2014, the FASB issued ASU No. 2014-9, which creates Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers,” and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, ASU No. 2014-9 supersedes the cost guidance in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts,” and creates new Subtopic 340-40, “Other Assets and Deferred Costs—Contracts with Customers.” In summary, the core principle of Topic 606 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The amendments in ASU No. 2014-9 are effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period, and early application is permitted for periods beginning after December 15, 2016. We have formed an implementation work team, completed training on ASC Topic 606 and are finishing a project to review relevant contracts. We have adopted the new standard effective January 1,2018under the modified retrospective approach.With respect to our revenue recognized, as of December 31, 2017, we have qualitatively assessed that the effect of adoption will have an impact to deferred revenues in either “Other current liabilities” or “Other liabilities”, to revenues recorded in excess of billings recorded in “Prepaid expenses and other current assets,” and the net impact recorded to “Retained earnings” on our accompanying Consolidated Balance Sheets. Quantitatively, we estimate that the effect of our retrospective adoption will be immaterial. Therefore, with respect to our modified retrospective adoption, we do not anticipate a change to our financial presentation on our Consolidated Balance Sheets as of December 31, 2017.

In February 2016, the FASB issued ASU No. 2016-2, which creates ASC Topic 842, “Leases.” This update increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. Our adoption, and the ultimate effect on our consolidated financial statements, will be based on an evaluation of the contract-specific facts and circumstances. We expect to adopt ASC 842 effective January 1, 2019. We expect to apply the modified retrospective approach to our adoption. Our adoption will have an impact on how our consolidated financial statements and related disclosures will be presented. With respect to leases whereby we are the lessee, we are currently expecting to recognize lease liabilities and offsetting “right of use” assets upon adoption. We are currently evaluating any other impacts ASC 842, including any newly issued guidance, will have on our consolidated financial statements and related disclosures. To facilitate that evaluation, we have completed training on the ASU, formed an implementation team and started the review and documentation of contracts.

In October 2016, the FASB issued ASU No. 2016-16 which amends ASC Topic 740, “Income Taxes.” The amendments in this update improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This standard is effective for interim and annual reporting periods beginning after December 15, 2017 and will be applied on a modified retrospective basis. As a result of the modified retrospective application, we will reduce “Other assets” in our Consolidated Balance Sheet with a cumulative adjustment to retained earnings of approximately $148.0 million as of January 1, 2018.

In February 2017, the FASB issued ASU No. 2017-6, which amends ASC Topic 960, “Defined Benefit Pension Plans,” ASC Topic 962, “Defined Contribution Pension Plans” and ASC Topic 965, “Health and Welfare Benefit Plans.” The amendments in this update clarify presentation requirements for an employee benefit plan’s interest in a master trust and require more detailed disclosures of the plan’s interest in the master trust. The amendments also eliminate a redundancy relating to 401(h) account disclosures. This standard is effective for fiscal years beginning after December 15, 2018, with early application permitted. We are evaluating what impact, if any, the adoption of this guidance will have on our financial condition, results of operations, cash flows or financial disclosures.

In February 2018, the FASB issued ASU No. 2018-2, which amends ASC Topic 220, “Income Statement—Reporting Comprehensive Income.” The amendments in this update allow for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Act. This standard is effective for interim and annual reporting periods beginning after December 15, 2018; however, we expect to early adopt ASC 220 effective January 1, 2018. The amendment should be applied on a retrospective basis to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Act is recognized. As a result of the retrospective application, we will reduce “Accumulated Other Comprehensive Income” with a cumulative adjustment to “Retained Earnings” of approximately $5.5 million as of January 1, 2018.

With the exception of the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our consolidated financial statements.

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Consolidated Joint Ventures

12 Months Ended

Dec. 31, 2017

Noncontrolling Interest [Abstract]

Consolidated Joint Ventures

Note 2— Consolidated Joint Ventures

We maintain a 50 percent interest in two joint ventures, each with a subsidiary of Royal Dutch Shell plc (“Shell”), that own and operate the twoBully-class drillships. We have determined that we are the primary beneficiary of the joint ventures. Accordingly, we consolidate the entities in our consolidated financial statements after eliminating intercompany transactions. Shell’s equity interests are presented as noncontrolling interests on our Consolidated Balance Sheets.

During the years ended December 31, 2017, 2016 and 2015, the Bully joint ventures approved and paid dividends totaling $113.8 million, $171.9 million and $143.0 million, respectively. Of these amounts, 50 percent was paid to our joint venture partner.

The combined carrying amount of the Bully-class drillships at December 31, 2017 and 2016 totaled $1.3 billion and $1.4 billion, respectively. These assets were primarily funded through partner equity contributions. Cash held by the Bully joint ventures totaled approximately $41.6 million at December 31, 2017 as compared to approximately $34.7 million at December 31, 2016.

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Earnings Per Share

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share

Note 3— Earnings Per Share

The following table presents the computation of basic and diluted earnings per share for Noble-UK:

	Year Ended December 31,
	2017			2016			2015
Numerator:
Basic
Net income (loss) attributable to Noble-UK	$	(516,511	)	$	(929,580	)	$	511,000
Net income (loss) from discontinued operations, net of tax	1,486			—			—
Earnings allocated to unvested share-based payment awards	—			—			(10,856		)
Net income (loss) from continuing operations to common shareholders - basic	$	(515,025	)	$	(929,580	)	$	500,144
Diluted
Net income (loss) attributable to Noble-UK	$	(516,511	)	$	(929,580	)	$	511,000
Net income (loss) from discontinued operations, net of tax	1,486			—			—
Net income (loss) from continuing operations to common shareholders - diluted	$	(515,025	)	$	(929,580	)	$	511,000
Denominator:
Weighted average shares outstanding - basic	244,743			243,127			242,146
Incremental shares issuable from assumed exercise of stock options and unvested share-based payment awards	—			—			5,256
Weighted average shares outstanding - diluted	244,743			243,127			247,402
Earnings per share
Basic:
Income (loss) from continuing operations	$	(2.10	)	$	(3.82	)	$	2.06
Income (loss) from discontinued operations	(0.01		)	—			—
Net income (loss) attributable to Noble-UK	$	(2.11	)	$	(3.82	)	$	2.06
Diluted:
Income (loss) from continuing operations	$	(2.10	)	$	(3.82	)	$	2.06
Income (loss) from discontinued operations	(0.01		)	—			—
Net income (loss) attributable to Noble-UK	$	(2.11	)	$	(3.82	)	$	2.06
Dividends per share	$	—		$	0.20		$	1.28

Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. For the years ended December 31, 2017 and 2016, 12.0 million and 9.9 million share-based awards, respectively, were excluded from the diluted earnings per share since the effect would have been anti-dilutive. For the year ended December 31, 2015, approximately 1.7 million underlying stock options were excluded from the diluted earnings per share as such stock options were anti-dilutive.

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Receivables from Customers

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Receivables from Customers

Note 4— Receivables from Customers

At December 31, 2016, we had receivables of approximately $14.4 million related to the Noble Max Smith, which had been disputed by our former customer, Petróleos Mexicanos (“Pemex”) and were classified as long-term and included in “Other assets” on our Consolidated Balance Sheet. The receivables were related to lost revenues for downtime that occurred after our rig was damaged when one of Pemex's supply boats collided with our rig in 2010. A Mexican subsidiary of Paragon Offshore, which had operated the Noble Max Smith, had been prosecuting the claim against Pemex. During the year ended December 31, 2017, Paragon Offshore has announced that, as part of its bankruptcy plan, it will liquidate the Mexican entity involved.

While Noble owns all rights to amounts from that claim and will take available actions to recover such amounts, we believe the announced actions by Paragon Offshore create uncertainty relating to the prosecution of the claim and associated recovery, and accordingly, the disputed amounts of approximately $14.4 million were written off through “Contract drilling services” costs on the accompanying Consolidated Statements of Operations during the year ended December 31, 2017.

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Property and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment

Note 5— Property and Equipment

Property and equipment, at cost, for Noble-UK consisted of the following:

	Year Ended December 31,
	2017		2016
Drilling equipment and facilities	$	11,746,629	$	12,048,571
Construction in progress	83,509		112,103
Other	204,193		204,214
Property and equipment, at cost	$	12,034,331	$	12,364,888

Capital expenditures, including capitalized interest, totaled $111.1 million, $659.9 million and $422.5 million for the years ended December 31, 2017, 2016 and 2015, respectively. During the year ended December 31, 2017, there was no capitalized interest due to the completion of our newbuild program. Capitalized interest was $22.4 million and$25.0 million for the years ended December 31, 2016 and 2015, respectively.

We took delivery of our final newbuild project, the heavy-duty, harsh environment jackup, the Noble Lloyd Noble, in July 2016, which commenced operations in November 2016 under a four-year contract in the North Sea. The Noble Sam Hartley commenced operations in January 2016.

During the year ended December 31, 2017, we recognized a $14.3 million charge in “Contract drilling services” costs related to damages sustained on the Noble Danny Adkins and Noble Jim Day during Hurricane Harvey in the U.S. Gulf of Mexico region.

During the years ended December 31, 2017, 2016, and 2015 we recognized a non-cash loss on impairment of $121.6 million, $1.5 billion and $418.3 million, respectively, related to our long-lived assets. See “Note 6— Impairment” for additional information.

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Impairment

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Impairment

Note 6— Impairment

In connection with the preparation of the consolidated financial statements included in this Annual Report, consistent with our accounting policies discussed in “Note 1— Organization and Significant Accounting Policies,” we evaluate our property and equipment for impairment whenever there are circumstances that suggest the value of an asset may not be recoverable.

An impairment loss on our property and equipment may exist when the estimated undiscounted cash flows expected to result from the use of the asset and its eventual disposition are less than its carrying amount. An impairment loss may be recognized when the excess of the asset's carrying value exceeds the estimated fair value. We estimate the fair value by applying the income valuation approach utilizing significant unobservable inputs, representative of a Level 3 fair value measurement. Assumptions used in our assessment included, but were not limited to, timing of future contract awards and expected operating day rates, operating costs, utilization rates, capital expenditures, reactivation costs and estimated economic useful lives. In addition, if we believe that one of our drilling units is no longer marketable or is otherwise unlikely to return to active service, we may elect to retire the unit and/or sell the unit at a value that may be substantially below its book value, and recognize an impairment charge that reduces the asset’s carrying value to the estimated fair value.

During the years ended December 31, 2017, 2016, and 2015, we recognized a non-cash loss on impairment of $121.6 million, $1.5 billion and $418.3 million, respectively, related to certain rigs and related capital spares.

During the year ended December 31, 2017, we identified indicators that certain assets in our fleet might not be recoverable. Such indicators included additional customer suspensions of drilling programs, contract cancellations, a further reduction in the number of new contract opportunities, resulting in reduced drilling contracts, and our belief that a drilling unit is no longer marketable and is unlikely to return to service. As a result, we determined that the carrying amounts of the Noble Amos Runner, Noble Alan Hay, NobleDavid Tinsley and certain capital spares were impaired and recorded an impairment charge of approximately $121.6 million.

During the year ended December 31, 2016, in connection with our impairment analysis, we impaired the carrying values to estimated fair values for the Noble Amos Runner, Noble Clyde Boudreaux and Noble Dave Beard and recorded a charge of $1.0 billion related to these units. In addition, we concluded that the semisubmersible, the Noble Homer Ferrington, and certain capital spare equipment would not be utilized in the foreseeable future, and we recognized impairment charges of approximately $120.1 million and $170.5 million, respectively. Further, we decided to retire our semisubmersible, Noble Max Smith, which was sold for $1.2 million after we recognized an impairment charge during the year of approximately $164.8 million.

During the year ended December 31, 2015, we decided that we would no longer market one of our drillships, the Noble Discoverer. The decision was a result of the termination of the contract for this rig by Shell in December 2015 and the decreased opportunities for rigs of this type in the current marketplace. We also reviewed assumptions on the future marketability of one of our jackups, the Noble Charles Copeland, after its contract completion in late September 2015, with consideration given to its years in service, limited technical features and anticipated capital requirements in light of the current market conditions, and we decided to discontinue marketing this unit. Additionally, based upon an analysis of capital spare equipment, we elected to retire certain capital spare equipment. Accordingly, we recorded an impairment charge of $406.0 million for the year ended December 31, 2015 for these rigs and certain capital spares.

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Debt

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Debt

Credit Facilities and Commercial Paper Program

2015 Credit Facility

At December 31, 2017, we had a five-year $2.4 billion senior unsecured credit facility that matures in January 2020 and which is guaranteed by our indirect, wholly owned subsidiaries, Noble Holding (U.S.) LLC (“NHUS”) and Noble Holding International Limited (“NHIL”) (the “2015 Credit Facility”). The 2015 Credit Facility also provided us with the ability to issue up to $500.0 million in letters of credit. The issuance of letters of credit under the facility reduces the amount available for borrowing. At December 31, 2017, we had no borrowings outstanding or letters of credit issued under our 2015 Credit Facility.

On December 19, 2017, we entered into the First Amendment and Consent and Successor Agent Agreement, (the “Amendment”) amending the 2015 Credit Facility. Upon certain conditions, including the entering into of the Company's 2017 Credit Facility (as defined below), the Amendment provides for, on or after January 3, 2018, among other things (i) a reduction in the aggregate principal amount of commitments under the 2015 Credit Facility to $300.0 million and (ii) the reduction of the 2015 Credit Facility's letter of credit subfacility to zero dollars. The maturity of the 2015 Credit Facility remains January 2020.

2017 Credit Facility

On December 21, 2017, Noble Cayman Limited, a Cayman Islands company and a wholly-owned indirect subsidiary of Noble-Cayman (“NCL”); Noble International Finance Company (“NIFCO”); and Noble Holding UK Limited, a company incorporated under the laws of England and Wales and a wholly-owned direct subsidiary of Noble-UK (“NHUK”), as parent guarantor, entered into a new senior unsecured credit agreement (the “2017 Credit Facility” and together with the 2015 Credit Facility, the “Credit Facilities”). The maximum aggregate amount of borrowings under the 2017 Credit Facility of $1.5 billion became available on January 3, 2018 upon the effectiveness of the commitment reduction under the 2015 Credit Facility. Borrowings under the 2017 Credit Facility are subject to certain conditions precedent, including that there be no unused commitments to advance loans under the 2015 Credit Facility. The 2017 Credit Facility provides for a letter of credit subfacility currently in the amount of $15.0 million, with the ability to increase such amount up to $500.0 million. Borrowings may be used for working capital and other general corporate purposes. The 2017 Credit Facility has an initial maturity of up to five years from the date on which the borrowings became available, or January 3, 2023. At December 31, 2017, we had no borrowings outstanding or letters of credit issued under the 2017 Credit Facility.

Both of our Credit Facilities have provisions which vary the applicable interest rates for borrowings based upon our debt ratings. We also pay a facility fee under each of the Credit Facilities on the daily unused amount of the underlying commitment which varies depending on our credit ratings. At December 31, 2017, the interest rates in effect under our Credit Facilities are the highest permitted interest rates under those agreements.

Debt Issuances

In December 2016, we issued $1.0 billion aggregate principal amount of the 2024 Notes, which we issued through our indirect wholly-owned subsidiary, NHIL. The net proceeds of approximately $967.6 million, after estimated expenses, were primarily used to retire a portion of our near-term senior notes in a related tender offer and the remaining portion was used for general corporate purposes. In January 2018, we issued and sold $750.0 million aggregate principal amount of our Senior Notes due 2026, which is described further in “Note 19— Subsequent Events.”

Senior Notes Interest Rate Adjustments

During 2017 and 2016, we experienced debt rating downgrades by Moody’s Investors Service and S&P Global Ratings, which reduced our debt ratings significantly below investment grade. As a result of these downgrades, we experienced interest rate increases during 2017 and 2016 on the 2018 Notes, 2025 Notes and 2045 Notes, all of which are subject to provisions that vary the applicable interest rates based on our debt rating. On October 18, 2017 S&P Global Ratings further reduced our debt rating, which will increase the interest rates on the 2025 Notes and 2045 Notes to 7.95% and 8.95%, respectively, beginning in April 2018. Once the new interest rates take effect in April 2018, these senior notes will have reached the contractually-defined maximum interest rate set for each rating agency and no further interest rate increase will occur.

Our other outstanding senior notes, including the 2024 Notes issued in December 2016, and 2026 Notes issued in January 2018, do not contain provisions varying applicable interest rates based upon our credit ratings.

Debt Tender Offers and Repayments

In March 2017, we repaid our 2017 Notes using cash on hand. We anticipate using cash on hand to repay the outstanding balance of our $300 million 2018 Notes, maturing in March 2018. In February 2018, we completed an optional redemption of our remaining 2019 Notes, which is described further in “Note 19— Subsequent Events.”

In December 2016, we commenced cash tender offers for our 2020 Notes, 2021 Notes and 2022 Notes. On December 28, 2016, we purchased $762.3 million of these Senior Notes for $750.0 million, plus accrued interest, using a portion of the net proceeds of the $1.0 billion2024 Notes issuance in December 2016. In December 2016, as a result of these tender offers, we recognized a net gain of approximately $6.7 million.

In March 2016, we commenced cash tender offers for our 2020 Notes and our 2021 Notes. On April 1, 2016, we purchased $36.0 million of these Senior Notes for $24.0 million, plus accrued interest, using cash on hand. In April 2016, as a result of these tender offers, we recognized a net gain of approximately $11.1 million.

Covenants

The 2015 Credit Facility is guaranteed by NHUS and NHIL. The 2015 Credit Facility contains a covenant that limits our ratio of debt to total tangible capitalization, as defined in the 2015 Credit Facility, to 0.60. At December 31, 2017, our ratio of debt to tangible capitalization was approximately 0.43. We were in compliance with all covenants under the 2015 Credit Facility as of December 31, 2017.

The 2017 Credit Facility contains certain financial covenants (as defined in the 2017 Credit Facility) applicable to NHUK and its subsidiaries, including (i) a covenant restricting debt to total tangible capitalization to not greater than 55% at the end of each fiscal quarter, (ii) a minimum Liquidity requirement of $300.0 million, (iii) a covenant that, beginning with the fiscal quarter ending March 31, 2018, the ratio of the Rig Value of Marketed Rigs to the sum of commitments under the 2017 Credit Facility plus indebtedness for borrowed money of the borrowers and guarantors, in each case, that directly own Marketed Rigs, is not less than 3:00 to 1:00 at the end of each fiscal quarter and (iv) a covenant that, beginning with the fiscal quarter ending March 31, 2018, the ratio of (A) the Rig Value of the Closing Date Rigs that are directly wholly owned by the borrowers and guarantors to (B) the Rig Value of the Closing Date Rigs owned by NHUK, subsidiaries of NHUK and certain local content affiliates, is not less than 80% at the end of each fiscal quarter (such covenants described in (iii) and (iv) of this paragraph, the “Guarantor Ratio Covenants”). The 2017 Credit Facility also includes restrictions on borrowings if, after giving effect to any such borrowings and the application of the proceeds thereof, the aggregate amount of Available Cash (as defined in the 2017 Credit Facility) would exceed $200.0 million.

NHUK has guaranteed the obligations of the borrowers under the 2017 Credit Facility. Certain other subsidiaries of Noble-UK will be required from time to time to guarantee the obligations of the borrowers under the 2017 Credit Facility in order maintain compliance with the Guarantor Ratio Covenants.

The 2017 Credit Facility contains additional covenants generally applicable to NHUK and its subsidiaries that NCL considers usual and customary for an agreement of this type, including compliance with laws (including environmental laws, ERISA and anti-corruption and sanctions laws), delivery of quarterly and annual financial statements, maintenance and operation of property, restrictions on the incurrence of liens and indebtedness, mergers and other fundamental changes, restricted payments, repurchases and redemptions of indebtedness with maturities outside of the maturity of the 2017 Credit Facility, sale and leaseback transactions and transactions with affiliates. Borrowings under the 2017 Credit Facility are subject to acceleration upon the occurrence of events of default that NCL considers usual and customary for an agreement of this type.

In addition to the covenants from the Credit Facilities noted above, the indentures governing our outstanding senior unsecured notes contain covenants that place restrictions on certain merger and consolidation transactions, unless we are the surviving entity or the other party assumes the obligations under the indenture, and on the ability to sell or transfer all or substantially all of our assets. In addition, there are restrictions on incurring debt or assuming certain liens and on entering into sale and lease-back transactions. The indenture for the 2026 Notes that we issued in January 2018 places more limitations on us and our subsidiaries than our other senior note indentures. See “—Debt Issuances” above.

At December 31, 2017, we were in compliance with all of the debt covenants under our Credit Facilities and senior notes. We continually monitor compliance with the covenants under our Credit Facilities and senior notes and expect to remain in compliance throughout 2018.

Five-year debt obligations

At December 31, 2017, aggregate principal repayments of total debt for the next five years and thereafter are as follows:

2018		2019		2020		2021		2022		Thereafter		Total
$	250,000	$	201,695	$	167,766	$	208,675	$	125,661	$	3,150,000	$	4,103,797

Carrying value and estimated fair values

Fair value represents the amount at which an instrument could be exchanged in a current transaction between willing parties. The estimated fair value of our senior notes was based on the quoted market prices for similar issues or on the current rates offered to us for debt of similar remaining maturities (Level 2 measurement). All remaining fair value disclosures are presented in “Note 13— Fair Value of Financial Instruments.”

The following table presents the carrying value and the estimated fair value of our total debt, not including the effect of unamortized debt issuance costs, respectively:

	December 31, 2017						December 31, 2016
	Carrying Value			Estimated Fair Value			Carrying Value			Estimated Fair Value
Senior unsecured notes
2.50% Senior Notes due March 2017	$	—		$	—		$	299,992		$	299,128
5.75% Senior Notes due March 2018	249,959			250,830			249,771			249,808
7.50% Senior Notes due March 2019	201,695			206,881			201,695			209,524
4.90% Senior Notes due August 2020	167,625			163,283			167,576			167,329
4.625% Senior Notes due March 2021	208,568			195,687			208,538			196,416
3.95% Senior Notes due March 2022	125,518			107,348			125,488			112,791
7.75% Senior Notes due January 2024	982,301			861,160			980,117			945,317
7.70% Senior Notes due April 2025	449,008			380,732			448,909			423,267
6.20% Senior Notes due August 2040	399,900			274,988			399,898			280,221
6.05% Senior Notes due March 2041	397,800			273,988			397,758			273,854
5.25% Senior Notes due March 2042	498,400			315,430			498,369			325,814
8.70% Senior Notes due April 2045	394,659			320,396			394,613			328,608
Total debt	4,075,433			3,350,723			4,372,724			3,812,077
Less: Unamortized debt issuance costs	(29,723		)				(32,613		)
Less: Current maturities of long-term debt (1)	(249,843		)	(250,830		)	(299,882		)	(299,128		)
Long-term debt, net of debt issuance costs	$	3,795,867		$	3,099,893		$	4,040,229		$	3,512,949

⁽¹⁾  Presented net of current portion of unamortized debt issuance costs of $0.1 million and $0.1 million at December 31, 2017 and 2016, respectively.

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Equity

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Equity

Note 8— Equity

Share Capital

As of December 31, 2017 Noble-UK had approximately 245.0 million shares outstanding and trading as compared to approximately 243.2 million shares outstanding and trading at December 31, 2016. Repurchased shares are recorded at cost, and include shares repurchased pursuant to our approved share repurchase program discussed below. Our Board of Directors may increase our share capital through the issuance of up to 53 million authorized shares (at current nominal value of $0.01 per share) without obtaining shareholder approval.

The declaration and payment of dividends require the authorization of the Board of Directors of Noble-UK, provided that such dividends on issued share capital may be paid only out of Noble-UK’s “distributable reserves” on its statutory balance sheet in accordance with UK laws. Therefore, Noble-UK is not permitted to pay dividends out of share capital, which includes share premiums. The resumption of the payment of future dividends will depend on our results of operations, financial condition, cash requirements, future business prospects, contractual restrictions and other factors deemed relevant by our Board of Directors.

Share Repurchases

The Company is only permitted to purchase its own shares by way of an “off-market purchase” in a plan approved by shareholders. In December 2014, we received shareholder approval to repurchase up to 37 million ordinary shares, or approximately 15 percent of our outstanding ordinary shares at the time of the shareholder approval. The authority to make such repurchases expired at the end of the Company’s 2016 annual general meeting of shareholders, which was held on April 22, 2016. During 2015, we repurchased 6.2 million of our ordinary shares covered by this authorization at an average price of $16.10 per share, excluding commissions and stamp tax, for a total cost of approximately $100.6 million. All shares repurchased were made in the open market pursuant to the share repurchase program discussed above, and all shares repurchased were immediately canceled. During the years ended December 31, 2017 and 2016, we did not repurchase any of our shares.

Share-Based Compensation Plans

Stock Plans

During 2015, Noble Corporation plc shareholders approved a new equity plan, the Noble Corporation 2015 Omnibus Incentive Plan (the “2015 Incentive Plan”), which permits grants of options, stock appreciation rights (“SARs”), stock or stock unit awards or cash awards, any of which may be structured as a performance award, from time to time to employees who are to be granted awards under the 2015 Incentive Plan. Neither consultants nor non-employee directors are eligible for awards under the 2015 Incentive Plan.

During 2017 and 2016, the 2015 Incentive Plan was restated and shareholders approved amendments, primarily to increase the number of ordinary shares available for issuance as long-term incentive compensation under the 2015 Incentive Plan by 3.7 million and 9.5 million shares, respectively. The maximum aggregate number of ordinary shares that may be granted for any and all awards under the 2015 Incentive Plan will not exceed 20.5 million shares and at December 31, 2017, we had 10.4 million shares remaining available for grants to employees.

The Noble Corporation 1991 Stock Option and Restricted Stock Plan, as amended (the “1991 Plan”), provides for the granting of options to purchase our shares, with or without stock appreciation rights, and the awarding of restricted shares or units to selected employees. Upon shareholder approval of the 2015 Incentive Plan, as described above, the 1991 Plan was terminated and equity based awards to employees are now made only through the 2015 Incentive Plan. Equity based awards previously granted under the 1991 Plan remain outstanding in accordance with their terms, which include the 1991 Plan.

Prior to 2017, we used the Noble Corporation 1992 Nonqualified Stock Options and Share Plan for Non-Employee Directors (the “1992 Plan”), to issue stock awards to non-employee directors. During 2017, upon shareholder approval, the Noble Corporation plc 2017 Director Omnibus Plan (the “Director Plan”) replaced the 1992 Plan. At the same time, the 1992 Plan was terminated and equity based awards to non-employee directors are now made only through the Director Plan.

Stock Options

Options have a term of 10 years, an exercise price equal to the fair market value of a share on the date of grant and generally vest over a three-year period. A summary of the status of stock options granted under both the 1991 Plan and 1992 Plan as of December 31, 2017, 2016 and 2015 and the changes during the year ended on those dates is presented below:

	2017				2016				2015
	Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options		Weighted Average Exercise Price
Outstanding at beginning of year	1,420,175		$	29.52	1,677,154		$	29.48	1,958,633		$	28.43
Expired	(107,020	)	29.74		(256,979	)	29.22		(281,479	)	22.17
Outstanding at end of year (1)	1,313,155		29.51		1,420,175		29.52		1,677,154		29.48
Exercisable at end of year (1)	1,313,155		$	29.51	1,420,175		$	29.52	1,677,154		$	29.48

⁽¹⁾  Options outstanding and exercisable at December 31, 2017 had no intrinsic value.

The following table summarizes additional information about stock options outstanding at December 31, 2017:

	Options Outstanding and Exercisable
	Number of Shares Underlying Options	Weighted Average Remaining Life (Years)	Weighted Average Exercise Price
$20.49 to $26.18	302,854	2.67	$	21.37
$26.19 to $31.51	360,936	5.10	30.59
$31.52 to $35.73	649,365	3.16	32.70
Total	1,313,155	3.58	$	29.51

The fair value of each option is estimated on the date of grant using a Black-Scholes pricing model. The expected term of options granted represents the period of time that the options are expected to be outstanding and is derived from historical exercise behavior, current trends and values derived from lattice-based models. Expected volatilities are based on implied volatilities of traded options on our shares, historical volatility of our shares, and other factors. The expected dividend yield is based on historical yields on the date of grant. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant.

There were no non-vested stock option balances at December 31, 2017 or any changes during the year ended December 31, 2017. No new stock options were granted during the years ended December 31, 2017, 2016 and 2015.

There was no compensation cost recognized during the years ended December 31, 2017 and 2016, respectively, related to stock options. Compensation cost recognized during the year ended December 31, 2015 related to stock options totaled $0.1 million.

Restricted Stock Units (“RSUs”)

We have awarded both TVRSUs and PVRSUs under the 1991 Plan and the 2015 Incentive Plan. The TVRSUs generally vest over a three-year period. The number of PVRSUs which vest will depend on the degree of achievement of specified corporate performance criteria over a three-year performance period. These criteria are strictly market-based criteria as defined by FASB standards.

The TVRSUs are valued on the date of award at our underlying share price. The total compensation for units that ultimately vest is recognized over the service period. The shares and related nominal value are recorded when the restricted stock unit vests and additional paid-in capital is adjusted as the share-based compensation cost is recognized for financial reporting purposes.

The market-based PVRSUs are valued on the date of grant based on the estimated fair value. Estimated fair value is determined based on numerous assumptions, including an estimate of the likelihood that our stock price performance will achieve the targeted thresholds and the expected forfeiture rate. The fair value is calculated using a Monte Carlo Simulation Model. The assumptions used to value the PVRSUs include historical volatility and risk-free interest rates over a time period commensurate with the remaining term prior to vesting, as follows:

	2017		2016		2015
Valuation assumptions:
Expected volatility	56.4	%	40.7	%	34.0	%
Expected dividend yield	—	%	—	%	9.4	%
Risk-free interest rate	1.49	%	0.97	%	0.8	%

Additionally, similar assumptions were made for each of the companies included in the defined index and the peer group of companies in order to simulate the future outcome using the Monte Carlo Simulation Model.

A summary of the RSUs awarded for each of the years ended December 31, 2017, 2016 and 2015 is as follows:

	2017		2016		2015
TVRSU
Units awarded (maximum available)	3,231,225		3,624,182		2,004,311
Weighted-average share price at award date	$	6.96	$	7.78	$	15.90
Weighted-average vesting period (years)	3.0		3.0		3.0
PVRSU
Units awarded (maximum available)	2,474,978		2,914,044		1,205,130
Weighted-average share price at award date	$	7.28	$	7.79	$	15.94
Three-year performance period ended December 31	2019		2018		2017
Weighted-average award-date fair value	$	4.37	$	3.81	$	9.12

During the years ended December 31, 2017, 2016 and 2015, we awarded 212,849, 227,937 and 99,063 shares, respectively, to our employees. During the year ended December 31, 2017, we awarded 197,316 shares to our non-employee directors.

A summary of the status of non-vested RSUs at December 31, 2017 and changes during the year ended December 31, 2017 is presented below:

	TVRSUs Outstanding		Weighted Average Award-Date Fair Value		PVRSUs Outstanding (1)		Weighted Average Award-Date Fair Value
Non-vested RSUs at January 1, 2017	4,089,167		$	11.18	4,378,825		$	7.85
Awarded	3,231,225		6.96		2,474,978		4.37
Vested	(1,768,175	)	47.20		(367,794	)	65.56
Forfeited	(508,715	)	8.41		(840,555	)	10.67
Non-vested RSUs at December 31, 2017	5,043,502		$	7.95	5,645,454		$	4.98

(1)The number of PVRSUs shown equals the units that would vest if the “maximum” level of performance is achieved. The minimum number of units is zero and the “target” level of performance is 50 percent of the amounts shown.

At December 31, 2017, there was $21.5 million of total unrecognized compensation cost related to the TVRSUs, which is expected to be recognized over a remaining weighted-average period of 1.6 years. The total award-date fair value of TVRSUs vested during the year ended December 31, 2017 was $23.8 million.

At December 31, 2017, there was $9.8 million of total unrecognized compensation cost related to the PVRSUs, which is expected to be recognized over a remaining weighted-average period of 1.5 years. The total potential compensation for PVRSUs is recognized over the service period regardless of whether the performance thresholds are ultimately achieved. In February 2018, 603,440 PVRSUs for the 2015-2017 performance period were forfeited.

Share-based amortization recognized during the years ended December 31, 2017, 2016 and 2015 related to all restricted stock totaled $29.1 million ($26.3 million net of income tax), $34.7 million ($31.0 million net of income tax) and $39.0 million ($31.0 million net of income tax), respectively. During the year ended December 31, 2017, capitalized share-based amortization was zero. During the years ended December 31, 2016 and 2015, capitalized share-based amortization totaled approximately $0.2 million and $1.0 million, respectively.

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Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Note 9— Accumulated Other Comprehensive Income (Loss)

The following table presents the changes in the accumulated balances for each component of AOCI for the years ended December 31, 2017 and 2016. All amounts within the tables are shown net of tax.

	Unrealized Gains /(Losses) on Cash Flow Hedges (1)			Defined Benefit Pension Items (2)			Foreign Currency Items			Total
Balance at December 31, 2015	$	—		$	(46,919	)	$	(16,256	)	$	(63,175	)
Activity during period:
Other comprehensive income (loss) before reclassifications	1,187			(8,237		)	(19		)	(7,069		)
Amounts reclassified from AOCI	(1,187		)	19,291			—			18,104
Net other comprehensive income (loss)	—			11,054			(19		)	11,035
Balance at December 31, 2016	$	—		$	(35,865	)	$	(16,275	)	$	(52,140	)
Activity during period:
Other comprehensive income before reclassifications	1,239			6,630			990			8,859
Amounts reclassified from AOCI	(1,239		)	1,632			—			393
Net other comprehensive income	—			8,262			990			9,252
Balance at December 31, 2017	$	—		$	(27,603	)	$	(15,285	)	$	(42,888	)

⁽¹⁾  Unrealized gains/(losses) on cash flow hedges are related to foreign currency forward contracts. Reclassifications from AOCI are recognized through “Contract drilling services” costs on our Consolidated Statements of Operations. See “Note 12— Derivative Instruments and Hedging Activities” for additional information.

⁽²⁾  Defined benefit pension items relate to actuarial changes and the amortization of prior service costs. Reclassifications from AOCI are recognized as expense on our Consolidated Statements of Operations through either “Contract drilling services” or “General and administrative.” “See Note 11— Employee Benefit Plans ” for additional information.

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Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Note 10— Income Taxes

Noble-UK is a company which is a tax resident in the UK and, as such, will be subject to UK corporation tax on its taxable profits and gains. A UK tax exemption is available in respect of qualifying dividends income and capital gains related to the sale of qualifying participations. We operate in various countries throughout the world, including the United States. The income or loss of the non-UK subsidiaries is not expected to be subject to UK corporation tax. Prior to the redomiciliation, Noble-Swiss was the group holding company and was exempt from Swiss cantonal and communal income tax on its worldwide income or loss, and was also granted participation relief from Swiss federal tax for qualifying dividend income and capital gains related to the sale of qualifying participations. It is expected that the participation relief will result in a full exemption of participation income from Swiss federal income tax. We do not expect the redomiciliation from Switzerland to the UK to have a material impact on our effective tax rate.

Consequently, we have taken account of those tax exemptions and provided for income taxes based on the laws and rates in effect in the countries in which operations are conducted, or in which we or our subsidiaries have a taxable presence for income tax purposes.

On December 22, 2017, the President of the United States signed The Act into law. The Act makes significant changes to various areas of U.S. federal income tax law by, among other things, lowering corporate income tax rates, implementing the territorial tax system, and rules limiting base erosion, and imposing a repatriation tax on deemed repatriated earnings of foreign subsidiaries of U.S parent shareholders.

The Company recognized the income tax effects of the Act in its 2017 financial statements in accordance with ASC Topic 740, Income Taxes, in the reporting period in which the Act was enacted. Based on guidance issued from SAB 118, the Company has not provided provisional estimates for items in which the accounting for certain income tax effects of the Act is incomplete and as such, the Company will continue to apply ASC 740 on the basis of the laws in effect immediately before the enactment of the Act.

The changes to existing U.S. tax law as a result of the Act, which had an impact on the Company's federal income taxes for 2017, are as follows:

• The Act reduces the federal corporate income tax rate to 21% from 35% effective January 1, 2018. Accordingly, the Company recorded a financial statement benefit of $109.0 million as a result of the remeasurement of its net deferred tax liabilities during the quarter ended December 31, 2017.

• The Act provides for a Deemed Repatriation Transition Tax (the “Transition Tax”), which is a one-time tax on previously untaxed accumulated earnings and profits (“E&P”) of certain foreign subsidiaries. For the quarter ended December 31, 2017, no additional income taxes were provided for as the Company has estimated there to be no untaxed accumulated E&P.

• The Act provides for immediate an deduction of 100% of the costs of qualified property that is placed in service after September 27, 2017 and before January 1, 2023.The deduction will phase out by 20 percentage points each calendar year for qualified property that is placed in service after December 21, 2022. The company has estimated no material impact from this provision for the quarter ended December 31, 2017.

The estimates above are provisional amounts based on information available as of December 31, 2017. These amounts are subject to changes as we refine our estimates and our interpretation of the Act. Any adjustments to these provisional amounts will be included in the financial statements in the reporting period in which such adjustments are determined, which will be no later than the fourth quarter of 2018.

Other provisions of the Act, which are effective January 1, 2018 and could have an impact on the Company's financial results for 2018 and later periods are as follows:

• The Act limits the deduction of business interest to 30% of “adjusted taxable income”, which is taxable income computed without regard to (i) any items not attributable to a trade or business, (ii) business interest income and business interest expense, (iii) any net operating loss deduction, and (iv) for taxable years beginning before January 1, 2022, deductions for depreciation , amortization and depletion. This limitation could result in a deferral or permanent reduction in the amount of interest that is deductible for U.S. federal income tax purposes after 2017.

• The Act eliminates the U.S. federal income tax carryback provision for net operating losses (“NOLs”) generated after 2017 and limits the taxpayer's ability to utilize NOL carryforwards to 80% of taxable income. These changes could impact the company's valuation allowance assessment for NOLs generated after December 31, 2017.

• The Act includes an anti-base erosion provision which establishes a tax on certain payments made by U.S. corporate taxpayers to related foreign persons, also referred to as Base Erosion and Anti-Abuse Tax (“BEAT”). The company is continuing to gather additional information to determine the ultimate impact of BEAT.

• The Act introduces a new anti-deferral provision, which subjects a U.S. parent shareholder to current tax on certain income referred to as GILTI, of its foreign subsidiaries. The company has not made any adjustments related to potential GILTI tax in its financial statements and has adopted a policy to treat tax due on future U.S. inclusions in taxable income as period costs when incurred.

The components of the net deferred taxes are as follows:

	2017			2016
Deferred tax assets
United States
Excess of net tax basis over remaining book basis	$	—		$	56,351
Deferred pension plan amounts	10,758			16,797
Accrued expenses not currently deductible	11,585			19,012
Other	2,150			6,803
Non-U.S.
Net operating loss carry forwards	—			3,800
Deferred pension plan amounts	134			3,120
Accrued expense not currently deductible	14,085			2,064
Deferred tax assets	38,712			107,947
Less: valuation allowance	—			(3,800		)
Net deferred tax assets	$	38,712		$	104,147
Deferred tax liabilities
United States
Excess of net book basis over remaining tax basis	$	(182,401	)	$	—
Other	(6,652		)	(7,672		)
Non-U.S.
Excess of net book basis over remaining tax basis	—			(200		)
Other	(402		)	(4,305		)
Deferred tax liabilities	(189,455		)	(12,177		)
Net deferred tax assets (liabilities)	$	(150,743	)	$	91,970

Income (loss) from continuing operations before income taxes consists of the following:

	Year Ended December 31,
	2017			2016			2015
United States	$	(81,329	)	$	(428,087	)	$	4,031
Non-U.S.	(368,485		)	(538,942		)	738,402
Total	$	(449,814	)	$	(967,029	)	$	742,433

The income tax provision (benefit) for continuing operations consists of the following: 

	Year Ended December 31,
	2017			2016			2015
Current- United States	$	(227,707	)	$	61,928		$	113,648
Current- Non-U.S.	29,010			18,813			81,756
Deferred- United States	257,432			(189,880		)	(38,103		)
Deferred- Non-U.S.	(16,106		)	(17		)	1,931
Total	$	42,629		$	(109,156	)	$	159,232

The following is a reconciliation of our reserve for uncertain tax positions, excluding interest and penalties. In 2016, we released an uncertain tax position in Libya in the gross amount of $40 million coupled with a related tax benefit of $13 million.

	2017			2016			2015
Gross balance at January 1,	$	159,826		$	169,687		$	108,812
Additions based on tax positions related to current year	14,187			15,665			31,022
Additions for tax positions of prior years	1,284			18,662			47,561
Reductions for tax positions of prior years	(860		)	(43,701		)	(11,945		)
Expiration of statutes	—			(487		)	(1,237		)
Tax settlements	—			—			(4,526		)
Gross balance at December 31,	174,437			159,826			169,687
Related tax benefits	(1,008		)	(1,008		)	(14,369		)
Net reserve at December 31,	$	173,429		$	158,818		$	155,318

The liabilities related to our reserve for uncertain tax positions are comprised of the following:

	2017		2016
Reserve for uncertain tax positions, excluding interest and penalties	$	173,429	$	158,818
Interest and penalties included in “Other liabilities”	18,431		13,702
Reserve for uncertain tax positions, including interest and penalties	$	191,860	$	172,520

At December 31, 2017, the reserves for uncertain tax positions totaled $191.9 million (net of related tax benefits of 1.0 million). If the December 31, 2017 reserves are not realized, the provision for income taxes would be reduced by $186.6 million. At December 31, 2016, the reserves for uncertain tax positions totaled $172.5 million (net of related tax benefits of 1.0 million).

It is reasonably possible that our existing liabilities related to our reserve for uncertain tax positions may fluctuate in the next 12 months primarily due to the completion of open audits or the expiration of statutes of limitation. However, we cannot reasonably estimate a range of changes in our existing liabilities due to various uncertainties, such as the unresolved nature of various audits.

We include, as a component of our “Income tax provision,” potential interest and penalties related to recognized tax contingencies within our global operations. Interest and penalties resulted in an income tax expense of $4.7 million in 2017, an income tax expense of $2.7 million in 2016 and an income tax benefit of $2.9 million in 2015.

During the year ended December 31, 2017, our income tax provision included a non-cash, discrete item of $260.7 million as the result of an internal tax restructuring, which was implemented to reduce costs associated with the ownership of multiple legal entities, simplify the overall legal entity structure, ease deployment of cash throughout the business and consolidate operations into one centralized group of entities.

As of December 31, 2017, we recorded deferred charges of $145.3 million related to the deferral of income tax expense on intercompany asset transfers as a result of our internal tax restructuring. The deferred charges are included in “Other assets” on the accompanying Consolidated Balance Sheet and are amortized as a component of income tax expense over the remaining life of the underlying assets.

We conduct business globally and, as a result, we file numerous income tax returns in U.S. and in non-U.S. jurisdictions. In the normal course of business we are subject to examination by taxing authorities throughout the world, including in jurisdictions such as Brazil, Brunei, Bulgaria, Cyprus, Mexico, Norway, Saudi Arabia, Argentina, Australia, Denmark, Gabon, Luxembourg, Malaysia, the Netherlands, Tanzania, Singapore, Switzerland, the United Kingdom and the United States. We are no longer subject to U.S. Federal income tax examinations for years before 2010 and non-U.S. income tax examinations for years before 2000.

Noble-UK conducts substantially all of its business through Noble-Cayman and its subsidiaries. The income or loss of our non-UK subsidiaries is not subject to UK income tax. Earnings are taxable in the United Kingdom at the UK statutory rate of 19 percent. The ongoing consultative process in the United Kingdom and a possible change in law could materially impact our tax rate on operations in the United Kingdom continental shelf. A reconciliation of tax rates outside of the United Kingdom and the Cayman Islands to our Noble-UK effective rate for continuing operations is shown below:

	Year Ended December 31,
	2017		2016		2015
Effect of:
Tax rates which are different than the UK and Cayman Island rates	23.4	%	8.4	%	14.4	%
Tax impact of asset impairment	11.7	%	3.9	%	5.3	%
Tax impact of tax restructuring	(76.1	)%	—	%	—	%
Tax impact of tax reform	33.4	%	—	%	—	%
Reserve for (resolution of) tax authority audits	(1.9	)%	(1.0	)%	1.7	%
Total	(9.5	)%	11.3	%	21.4	%

We generated and fully utilized U.S. foreign tax credits of $15.0 million in 2015. Due to foreign tax credit limitation constraints, in 2017 and 2016, the Company has made the determination to take foreign tax expense as a deduction against U.S. taxable income.

At December 31, 2017, the company asserts that the investment in foreign subsidiaries is permanent in nature, and estimates that there are no net cumulative earnings in its foreign subsidiaries. At December 31, 2016, we had no undistributed earnings of our subsidiaries for which deferred income taxes have not been provided.

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Employee Benefit Plans

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Employee Benefit Plans

Note 11— Employee Benefit Plans

Defined Benefit Plans

Noble maintains two pension plans for certain of our employees whose most recent date of employment is prior to April 1, 2014 operating in the North Sea, the Noble Drilling (Land Support) Limited (“NDLS”) and the Noble Resources Limited (“NRL”), both indirect, wholly-owned subsidiaries of Noble-UK. Reference to our “non-U.S. plans” included throughout this report relates to both the NDLS and NRL plans, as well as the activity for the two legacy plans for the periods prior to the Spin-off.

In addition to the non-U.S. plans discussed above, we have two U.S. noncontributory defined benefit pension plans: one which covers certain salaried employees and one which covers certain hourly employees, whose initial date of employment is prior to August 1, 2004 (collectively referred to as our “qualified U.S. plans”). These plans are governed by the Noble Drilling Employees’ Retirement Trust (the “Trust”). These plans qualify under the Employee Retirement Income Security Act of 1974 (“ERISA”), and our funding policy is consistent with funding requirements of ERISA and other applicable laws and regulations. We make cash contributions, or utilize credit balances available to us under the plan, for the qualified U.S. plans when required. The benefit amount that can be covered by the qualified U.S. plans is limited under ERISA and the Internal Revenue Code (“IRC”) of 1986. Therefore, we maintain an unfunded, nonqualified excess benefit plan designed to maintain benefits for specified employees at the formula level in the qualified salary U.S. plan. We refer to the qualified U.S. plans and the excess benefit plan collectively as the “U.S. plans.”

During the fourth quarter of 2016, we approved amendments, effective as of December 31, 2016, to our non-U.S. and U.S. defined benefit plans. With these amendments, employees and alternate payees will accrue no future benefits under the plans after December 31, 2016. However, these amendments will not affect any benefits earned through that date.

During the years ended December 31, 2017, we made contributions to our pension plans of approximately $0.6 million, which satisfied our obligations under our defined benefit plan for the North Sea region.

A reconciliation of the changes in projected benefit obligations (“PBO”) for our non-U.S. and U.S. plans is as follows:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Benefit obligation at beginning of year	$	72,347		$	216,577		$	69,372		$	228,390
Service cost	—			—			2,914			6,647
Interest cost	2,151			8,593			2,412			9,557
Actuarial loss (gain)	(11,265		)	19,113			19,296			(5,178		)
Benefits paid	(2,836		)	(6,795		)	(3,515		)	(5,747		)
Settlements and curtailments	(4,825		)	(2,313		)	(5,735		)	(17,092		)
Plan participants’ contributions	—			—			307			—
Foreign exchange rate changes	6,380			—			(12,704		)	—
Benefit obligation at end of year	$	61,952		$	235,175		$	72,347		$	216,577

A reconciliation of the changes in fair value of plan assets is as follows:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Fair value of plan assets at beginning of year	$	71,286		$	171,240		$	75,855		$	167,947
Actual return on plan assets	5,594			24,760			9,371			8,657
Employer contributions	651			2,348			2,832			383
Benefits paid	(2,836		)	(6,795		)	(3,515		)	(5,747		)
Plan participants’ contributions	—			—			307			—
Settlement and curtailment	(4,597		)	(2,313		)	—			—
Foreign exchange rate changes	7,043			—			(13,564		)	—
Fair value of plan assets at end of year	$	77,141		$	189,240		$	71,286		$	171,240

The funded status of the plans is as follows:

	Years Ended December 31,
	2017					2016
	Non-U.S.		U.S.			Non-U.S.			U.S.
Funded status	$	15,189	$	(45,935	)	$	(1,061	)	$	(45,337	)

Amounts recognized in the Consolidated Balance Sheets consist of:

	Years Ended December 31,
	2017					2016
	Non-U.S.		U.S.			Non-U.S.			U.S.
Other assets (noncurrent)	$	15,189	$	—		$	313		$	229
Other liabilities (current)	—		(2,312		)	—			(3,857		)
Other liabilities (noncurrent)	—		(43,623		)	(1,374		)	(41,709		)
Net amount recognized	$	15,189	$	(45,935	)	$	(1,061	)	$	(45,337	)

Amounts recognized in AOCI consist of:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Net actuarial loss	$	2,258		$	39,569		$	17,035		$	34,200
Deferred income tax asset	(375		)	(13,849		)	(3,120		)	(12,250		)
Accumulated other comprehensive loss	$	1,883		$	25,720		$	13,915		$	21,950

Pension costs include the following components:

	Years Ended December 31,
	2017						2016						2015
	Non-U.S.			U.S.			Non-U.S.			U.S.			Non-U.S.			U.S.
Service cost	$	—		$	—		$	2,914		$	6,647		$	3,344		$	8,596
Interest cost	2,151			8,593			2,412			9,557			2,546			9,198
Return on plan assets	(2,879		)	(11,764		)	(3,393		)	(12,389		)	(3,673		)	(13,146		)
Amortization of prior service cost	—			—			104			118			104			142
Recognized net actuarial loss	743			1,464			142			4,398			315			6,158
Settlement and curtailment gains	(838		)	82			600			200			—			—
Net pension benefit cost (gain)	$	(823	)	$	(1,625	)	$	2,779		$	8,531		$	2,636		$	10,948

There is no estimated net actuarial losses or prior service cost for either of the non-U.S. plans or U.S. plans that will be amortized from AOCI into net periodic pension cost in 2018.

During the years ended December 31, 2017, 2016 and 2015, we adopted the Retirement Plan (“RP”) mortality tables with the Mortality Projection (“MP”) scale as issued by the Society of Actuaries for each of the respective years. The RP 2017, 2016 and 2015 mortality tables represent the new standard for defined benefit mortality assumptions due to adjusted life expectancies. The adoption of the updated mortality tables and the mortality improvement scales decreased our pension liability on our U.S. plans by approximately $1.6 million, $2.9 million and $3.0 million as of December 31, 2017, 2016 and 2015.

Defined Benefit Plans—Disaggregated Plan Information

Disaggregated information regarding our non-U.S. and U.S. plans is summarized below:

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Projected benefit obligation	$	61,952	$	235,175	$	72,347	$	216,577
Accumulated benefit obligation	61,952		235,175		72,347		216,577
Fair value of plan assets	77,141		189,240		71,286		171,240

The following table provides information related to those plans in which the PBO exceeded the fair value of the plan assets at December 31, 2017 and 2016. The PBO is the actuarially computed present value of earned benefits based on service to date and includes the estimated effect of any future salary increases. Employees and alternate payees have no longer accrued future benefits under the plans since December 31, 2016.

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Projected benefit obligation	$	—	$	235,175	$	5,015	$	189,244
Fair value of plan assets	—		189,240		3,642		143,678

The PBO for the unfunded excess benefit plan was $16.4 million at December 31, 2017 as compared to $16.9 million in 2016, and is included under “U.S.” in the above tables.

The following table provides information related to those plans in which the accumulated benefit obligation (“ABO”) exceeded the fair value of plan assets at December 31, 2017 and 2016. The ABO is the actuarially computed present value of earned benefits based on service to date, but differs from the PBO in that it is based on current salary levels. Employees and alternate payees will accrue no future benefits under the plans after December 31, 2016.

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Accumulated benefit obligation	$	—	$	235,175	$	5,015	$	189,244
Fair value of plan assets	—		189,240		3,642		143,678

The ABO for the unfunded excess benefit plan was $16.4 million at December 31, 2017 as compared to $16.9 million in 2016, and is included under “U.S.” in the above tables.

Defined Benefit Plans—Key Assumptions

The key assumptions for the plans are summarized below:

	Years Ended December 31,
	2017			2016
	Non-U.S.		U.S.	Non-U.S.		U.S.
Weighted-average assumptions used to determine benefit obligations:
Discount Rate	2.60	%	2.84%-3.66%	2.15%-2.70%		3.00%-4.24%
Rate of compensation increase	N/A		N/A	3.6	%	N/A

	Years Ended December 31,
	2017			2016			2015
	Non-U.S.		U.S.	Non-U.S.	U.S.		Non-U.S.	U.S.
Weighted-average assumptions used to determine periodic benefit cost:
Discount Rate	2.48%-2.70%		3.00%-4.24%	2.15%-3.90%	3.09%-4.48%		2.60%-3.70%	2.98%-4.38%
Expected long-term return on assets	4.10	%	6.00%-6.50%	1.60%-5.00%	7.00	%	1.60%-4.90%	7.50	%
Rate of compensation increase	N/A		N/A	3.60%-4.20%	N/A		3.60%-4.10%	2.00%-5.00%

The discount rate used to calculate the net present value of future benefit obligations for our U.S. plan is based on the average of current rates earned on long-term bonds that receive a Moody’s rating of “Aa” or better. We have determined that the timing and amount of expected cash outflows on our plan reasonably match this index. For non-U.S. plans, the discount rates used to calculate the net present value of future benefit obligations are determined by using a yield curve of high quality bond portfolios with an average maturity approximating that of the liabilities.

In developing the expected long-term rate of return on assets, we considered the current level of expected returns on risk free investments (primarily government bonds), the historical level of risk premium associated with the other asset classes in which the portfolio is invested and the expectations for future returns of each asset class. The expected return for each asset class was then weighted based on the target asset allocation to develop the expected long-term rate of return on assets for the portfolio. To assist us with this analysis, we employ third-party consultants for our U.S. and non U.S. plans that use a portfolio return model.

Defined Benefit Plans—Plan Assets

Non-U.S. Plans

The NDLS pension plan has a target asset allocation of 70 percent equity securities and 30 percent debt securities. The investment objective of the plan, as adopted by the plan’s trustees, is to achieve a favorable return against a benchmark of blended United Kingdom market indices. By achieving this objective, the trustees believe the plan will be able to avoid significant volatility in the contribution rate and provide sufficient plan assets to cover the plan’s benefit obligations were the plan to be liquidated. To achieve these objectives, the trustees have given the plan’s investment managers full discretion in the day-to-day management of the plan’s assets. The plan’s assets are invested with two investment managers. The performance objective communicated to one of these investment managers is to exceed a blend of FTSE A Over 15 Year Gilts index and iBoxx Sterling Non Gilts All Stocks index by 1.25 percent per annum gross of fees over rolling three year periods. The performance objective communicated to the other investment manager is to exceed a blend of FTSE’s All Share index, All World North America index, All World Europe index and All World Asia Pacific index by 1.00 to 2.00 percent per annum gross of fees over rolling five year periods. This investment manager is prohibited by the trustees from investing in real estate. The trustees meet with the investment managers periodically to review and discuss their investment performance.

The actual fair values of Non-U.S. pension plans are as follows:

	Year Ended December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	280	$	280	$	—	$	—
Equity securities:
International companies	54,145		54,145		—		—
Fixed income securities:
Corporate bonds	22,716		22,716		—		—
Total	$	77,141	$	77,141	$	—	$	—

	Year Ended December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	337	$	337	$	—	$	—
Equity securities:
International companies	46,845		46,845		—		—
Fixed income securities:
Corporate bonds	20,462		20,462		—		—
Other	3,642		—		—		3,642
Total	$	71,286	$	67,644	$	—	$	3,642

U.S. Plans

The Trust invests in equity securities, fixed income debt securities, and cash equivalents and other short-term investments. The Trust may invest in these investments directly or through pooled vehicles, including mutual funds.

The Company’s overall investment strategy, or target range, is to achieve a mix of approximately 31.5 percent in equity securities, 67.3 percent in debt securities and 1.2 percent in cash holdings. Actual results may deviate from the target range, however any deviation from the target range of asset allocations must be approved by the Trust’s governing committee.

The performance objective of the Trust is to outperform the return of the Total Index Composite as constructed to reflect the target allocation weightings for each asset class. This objective should be met over a market cycle, which is defined as a period not less than three years or more than five years. U.S. equity securities (common stock, convertible preferred stock and convertible bonds) should achieve a total return (after fees) that exceeds the total return of an appropriate market index over a full market cycle of three to five years. Non-U.S. equity securities (common stock, convertible preferred stock and convertible bonds), either from developed or emerging markets, should achieve a total return (after fees) that exceeds the total return of an appropriate market index over a full market cycle of three to five years. Fixed income debt securities should achieve a total return (after fees) that exceeds the total return of an appropriate market index over a full market cycle of three to five years.

For investments in mutual funds, the assets of the Trust are subject to the guidelines and limits imposed by such mutual fund’s prospectus and the other governing documentation at the fund level.

No shares of Noble were included in equity securities at either December 31, 2017 or 2016.

The actual fair values of U.S. pension plan assets are as follows:

	Year Ended December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	3,275	$	3,275	$	—	$	—
Equity securities:
United States	43,535		16,430		27,105		—
International	17,712		17,712		—		—
Fixed income securities:
Corporate bonds	40,793		40,793		—		—
Treasury bonds	83,925		83,925		—		—
Total	$	189,240	$	162,135	$	27,105	$	—

	Year Ended December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	2,524	$	2,524	$	—	$	—
Equity securities:
United States	80,264		80,264		—		—
International	34,049		34,049		—		—
Fixed income securities:
Corporate bonds	54,403		54,403		—		—
Total	$	171,240	$	171,240	$	—	$	—

As of December 31, 2017, no single security made up more than 10 percent of total assets of either the U.S. or the Non-U.S. plans.

Defined Benefit Plans—Cash Flows

In 2017, we made total contributions of $0.7 million and $2.3 million to our non-U.S. and U.S. pension plans, respectively. In 2016, we made total contributions of $2.8 million and $0.4 million to our non-U.S. and U.S. pension plans, respectively. In 2015, we made total contributions of $2.2 million and $0.5 million to our non-U.S. and U.S. pension plans, respectively. We expect our aggregate minimum contributions to our non-U.S. and U.S. plans in 2018, subject to applicable law, to be zero and $2.3 million, respectively. We continue to monitor and evaluate funding options based upon market conditions and may increase contributions at our discretion.

The following table summarizes our estimated benefit payments at December 31, 2017:

			Payments by Period
	Total		2018		2019		2020		2021		2022		Thereafter
Estimated benefit payments
Non U.S. plans	$	36,203	$	3,079	$	3,189	$	3,301	$	3,419	$	3,540	$	19,675
U.S. plans	109,410		9,544		8,904		9,342		13,359		12,350		55,911
Total estimated benefit payments	$	145,613	$	12,623	$	12,093	$	12,643	$	16,778	$	15,890	$	75,586

Other Benefit Plans

We sponsor a 401(k) Restoration Plan, which is a nonqualified, unfunded employee benefit plan under which specified employees may elect to defer compensation in excess of amounts deferrable under our 401(k) savings plan. The 401(k) Restoration Plan has no assets, and amounts withheld for the 401(k) Restoration Plan are kept by us for general corporate purposes. The investments selected by employees and associated returns are tracked on a phantom basis. Accordingly, we have a liability to the employee for amounts originally withheld plus phantom investment income or less phantom investment losses. We are at risk for phantom investment income and, conversely, benefit should phantom investment losses occur. At both December 31, 2017 and 2016, our liability for the 401(k) Restoration Plan was $8.8 million and $7.7 million, respectively, and is included in “Accrued payroll and related costs.”

In 2005 we enacted a profit sharing plan, the Noble Drilling Services Inc. Profit Sharing Plan, which covers eligible employees, as defined. Participants in the plan become fully vested in the plan after three-years of service. Profit sharing contributions are discretionary, require Board of Directors approval and are made in the form of cash. Contributions recorded related to this plan totaled $3.1 million, $6.0 million and $6.5 million, respectively, for three years ended December 31, 2017, 2016 and 2015.

We sponsor other retirement, health and welfare plans and a 401(k) savings plan for the benefit of our employees. The cost of maintaining these plans for continuing operations aggregated approximately $27.6 million, $37.2 million and $54.8 million in 2017, 2016 and 2015, respectively. We do not provide post-retirement benefits (other than pensions) or any post-employment benefits to our employees.

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Derivative Instruments and Hedging Activities

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

Note 12— Derivative Instruments and Hedging Activities

We periodically enter into derivative instruments to manage our exposure to fluctuations in interest rates and foreign currency exchange rates. We have documented policies and procedures to monitor and control the use of derivative instruments. We do not engage in derivative transactions for speculative or trading purposes, nor are we a party to leveraged derivatives.

For foreign currency forward contracts, hedge effectiveness is evaluated at inception based on the matching of critical terms between derivative contracts and the hedged item. Any change in fair value resulting from ineffectiveness is recognized immediately in earnings.

On May 10, 2016, Freeport-McMoRan Inc. (“Freeport”), Freeport-McMoRan Oil & Gas LLC and one of our subsidiaries entered into an agreement terminating the contracts on the Noble Sam Croft and Noble Tom Madden (“FCX Settlement”), which were scheduled to end in July 2017 and November 2017, respectively. The FCX Settlement included two contingent payments, which are further discussed below. We accounted for these contingent payments as derivative instruments that did not qualify under the FASB standards for hedge accounting treatment, and therefore, changes in fair values were recognized as a loss in our accompanying Consolidated Statements of Operations.

Cash Flow Hedges

Several of our regional shorebases, including our North Sea operations, have a significant amount of their cash operating expenses payable in local currencies. To limit the potential risk of currency fluctuations, we periodically enter into forward contracts, which settle monthly in the operations’ respective local currencies. All of these contracts have a maturity of less than 12 months. During 2017 and 2016, we entered into forward contracts of approximately $37.6 million and $53.1 million, respectively, all of which settled during their respective years. At both December 31, 2017 and 2016, we had no outstanding derivative contracts.

FCX Settlement

Pursuant to the FCX Settlement, Noble could have received contingent payments from the FCX Settlement on September 30, 2017, depending on the average price of oil over a 12-month period from June 30, 2016 through June 30, 2017. The average price of oil was calculated using the daily closing price of West Texas Intermediate crude oil (“WTI”) (CL1) on the New York Mercantile Exchange for the period of June 30, 2016 through June 30, 2017. If the price of WTI averaged more than $50 per barrel during such period, Freeport would have paid $25.0 million to Noble. In addition to the $25.0 million contingent payment, if the price of WTI averaged more than $65 per barrel during such period, Freeport would have paid an additional $50.0 million to Noble. These contingent payments did not qualify for hedge accounting treatment under FASB standards, and therefore, the change in fair value was recognized as a loss in our Consolidated Statements of Operations. These contingent payments are referred to as non-designated derivatives in the following tables.

The price of WTI did not average more than $50 per barrel during the 12-month period. As of June 30, 2017, the fair value of these contingent payments was reduced to zero, as the period for earning the contingent payments had ended.

Financial Statement Presentation

The following table, together with “Note 13— Fair Value of Financial Instruments,” summarizes the financial statement presentation and fair value of our derivative positions as of December 31, 2017 and 2016:

		Estimated fair value
	Balance sheet classification	December 31, 2017		December 31, 2016
Asset derivatives
Non-designated derivatives
FCX Settlement	Prepaid expenses and other current assets	$	—	$	14,400

The following table, together with “Note 13— Fair Value of Financial Instruments,” summarizes the recognized gains and losses of cash flow hedges and non-designated derivatives through AOCI or as “Contract drilling services” revenue or costs for the years ended December 31, 2017 and 2016:

	Year Ended December 31,
	2017			2016			2017		2016		2017			2016
	Unrealized gain/(loss) recognized through AOCI						Gain/(loss) reclassified from AOCI to "Contract drilling services" costs				Gain/(loss) recognized through "Contract drilling services" revenue
Cash flow hedges
Foreign currency forward contracts	$	(1,239	)	$	(1,187	)	$	—	$	—	$	1,239		$	1,187
Non-designated derivatives
FCX Settlement	$	—		$	—		$	—	$	—	$	(14,400	)	$	14,400

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Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Note 13— Fair Value of Financial Instruments

The following tables present the carrying amount and estimated fair value of our financial instruments recognized at fair value on a recurring basis:

	December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets -
Marketable securities	$	7,321	$	7,321	$	—	$	—

	December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets -
Marketable securities	$	6,246	$	6,246	$	—	$	—
FCX Settlement	$	14,400	$	—	$	—	$	14,400

Our cash and cash equivalents, accounts receivable, marketable securities and accounts payable are by their nature short-term. As a result, the carrying values included in the accompanying Consolidated Balance Sheets approximate fair value.

The following table presents the activity related to the FCX Settlement asset classified within Level 3 of the valuation hierarchy for the years ended December 31, 2017 and 2016:

Balance as of December 31, 2015	$	—
Fair value recognized in earnings	17,600
Change in fair value recognized in earnings	(3,200		)
Balance as of December 31, 2016	14,400
Change in fair value recognized in earnings	(14,400		)
Balance as of December 31, 2017	$	—

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 14— Commitments and Contingencies

Transocean Ltd.

In January 2017, a subsidiary of Transocean Ltd. (“Transocean”) filed suit against us and certain of our subsidiaries for patent infringement in a Texas federal court. The suit claims that five of our newbuild rigs that operated in the U.S. Gulf of Mexico violated Transocean patents relating to what is generally referred to as dual-activity drilling. We were aware of the patents when we constructed the rigs, and we do not believe that our rigs infringe the Transocean patents, which are now expired. The lawsuit is proceeding and we intend to defend ourselves vigorously against this claim.

Department of Justice settlement.

In December 2014, one of our subsidiaries reached a settlement with the U.S. Department of Justice (“DOJ”) regarding our former drillship, the Noble Discoverer, and the Kulluk, a rig we were providing contract labor services for, in respect of violations of applicable law discovered in connection with a 2012 Coast Guard inspection in Alaska and our own subsequent internal investigation. Under the terms of the agreement, the subsidiary pled guilty to oil record book, ballast record and required hazardous condition reporting violations with respect to the Noble Discoverer and an oil record book violation with respect to the Kulluk. The subsidiary paid $8.2 million in fines and $4.0 million in community service payments and was placed on probation for four years, with the right to petition the court for early dismissal of probation after three years. We were granted our motion to early terminate the plea agreement effective as of March 1, 2018. If, during the remaining term of probation, the subsidiary fails to adhere to the terms of the plea agreement, the DOJ may withdraw from the plea agreement and would be free to prosecute the subsidiary on all charges arising out of its investigation, including any charges dismissed pursuant to the terms of the plea agreement, as well as potentially other charges. We also implemented a comprehensive environmental compliance plan in connection with the settlement.

Brazil commercial agent.

We have used a commercial agent in Brazil in connection with our Petróleo Brasileiro S.A. (“Petrobras”) drilling contracts. We understand that this agent has represented a number of different companies in Brazil over many years, including several offshore drilling contractors. In November 2015, this agent pled guilty in Brazil in connection with the award of a drilling contract to a competitor and implicated a Petrobras official as part of a wider investigation of Petrobras’ business practices. Following news reports relating to the agent’s involvement in the Brazil investigation in connection with his activities with other companies, we conducted a review, which is now substantially complete, of our relationship with the agent and with Petrobras. We have been in contact with the SEC, the Brazilian federal prosecutor’s office and the DOJ about this matter. We have cooperated with these agencies and they are aware of our internal review. To our knowledge, neither the agent, nor the government authorities investigating the matter, has alleged that the agent or Noble acted improperly in connection with our contracts with Petrobras.

Paragon Offshore.

On August 1, 2014, Noble-UK completed the Spin-off of its wholly-owned subsidiary, Paragon Offshore, to the holders of Noble’s ordinary shares. In February 2016, Paragon Offshore sought approval of a pre-negotiated plan of reorganization (the “Prior Plan”) by filing for voluntary relief under Chapter 11 of the United States Bankruptcy Code. As part of the Prior Plan, we entered into a settlement agreement with Paragon Offshore (the “Settlement Agreement”). The Prior Plan was rejected by the bankruptcy court in October 2016.

In April 2017, Paragon Offshore filed an updated disclosure statement and a revised plan of reorganization (the “New Plan”) in its bankruptcy proceeding. Under the New Plan, including Paragon Offshore’s revised business plan, Paragon Offshore no longer needed the Mexican tax bonding that Noble-UK was to provide under the Settlement Agreement. As a result, the Settlement Agreement was no longer applicable to the ongoing business of Paragon Offshore. Consequently, Paragon Offshore abandoned the Settlement Agreement as part of the New Plan, and the Settlement Agreement was terminated at the time of the filing of the New Plan. On May 2, 2017, Paragon Offshore announced that it had reached an agreement in principle with both its secured and unsecured creditors to revise the New Plan to, among other things, create and fund a $10.0 million litigation trust to pursue litigation against us. On June 7, 2017, the revised New Plan was approved by the bankruptcy court and Paragon Offshore emerged from bankruptcy on July 18, 2017.

On December 15, 2017, the litigation trust filed claims relating to the Spin-off against us and certain of our current and former officers and directors in the Delaware bankruptcy court that heard Paragon Offshore’s bankruptcy. The complaint alleges claims of alleged actual and constructive fraudulent conveyance, unjust enrichment and recharacterization of intercompany notes as equity claims against Noble and claims of breach of fiduciary duty and aiding and abetting breach of fiduciary duty against the officer and director defendants. We continue to believe that Paragon Offshore, at the time of the Spin-off, was properly funded, solvent and had appropriate liquidity and that the claims brought by the litigation trust are without merit and will be contested vigorously by us.

If any of the litigation trust’s claims are successful, or if we elect to settle any claims, any damages or other amounts we would be required to or agree to pay could have a material adverse effect on our business, financial condition and results of operations. The litigation is in the very early stages, no schedule has been established, and we are not able to predict when, or if, the matters will go to trial or otherwise be concluded. We may be required to establish reserves on our financial statements in advance of the conclusion of the litigation. Such reserves may be substantial and could have a material adverse effect on our financial condition as presented in such financial statements.

Prior to the completion of the Spin-off, Noble-UK and Paragon Offshore entered into the Separation Agreements to effect the separation and Spin-off and govern the relationship between the parties after the Spin-off, including the MSA and the TSA.

As part of its final bankruptcy plan, Paragon Offshore rejected the Separation Agreements. Accordingly, the indemnity obligations that Paragon Offshore potentially would have owed us under the Separation Agreements have now terminated, including indemnities arising under the MSA and the TSA in respect of obligations related to Paragon Offshore’s business that were incurred through Noble-retained entities prior to the Spin-off. Likewise, any potential indemnity obligations that we would have owed Paragon Offshore under the Separation Agreements, including those under the MSA and the TSA in respect of Noble-UK’s business that was conducted prior to the Spin-off through Paragon Offshore-retained entities, are now also extinguished. In the absence of the Separation Agreements, liabilities relating to the respective parties will be borne by the owner of the legal entity or asset at issue and neither party will look to an allocation based on the historic relationship of an entity or asset to one of the party’s business, as had been the case under the Separation Agreements.

The rejection and ultimate termination of the indemnity and related obligations under the Separation Agreements has resulted in a number of accounting charges and benefits for the year ended December 31, 2017, and such termination may continue to affect us in the future as liabilities arise for which we would have been indemnified by Paragon Offshore or would have had to indemnify Paragon Offshore. We do not expect that, overall, the rejection of the Separation Agreements by Paragon Offshore will have a material adverse effect on our financial condition or liquidity. However, any loss we experience with respect to which we would have been able to secure indemnification from Paragon Offshore under one or more of the Separation Agreements could have an adverse impact on our results of operations in any period, which impact may be material depending on our results of operations during this down-cycle.

During the year ended December 31, 2017, we recognized net charges of $15.9 million, with a non-cash loss of $1.5 million in “Net loss from discontinued operations, net of tax” on our Consolidated Statements of Operations related to Paragon Offshore's emergence from bankruptcy.

Tax matters.

During 2014, the IRS began its examination of our tax reporting in the U.S. for the taxable years ended December 31, 2010 and 2011. The IRS examination team has completed its examination of our 2010 and 2011 U.S. tax returns and proposed adjustments and deficiencies with respect to certain items that were reported by us for the 2010 and 2011 tax year. On December 19, 2016, we received the Revenue Agent Report (“RAR”) from the IRS. We believe that we have accurately reported all amounts in our tax returns, and have submitted administrative protests with the IRS Office of Appeals contesting the examination team’s proposed adjustments. We intend to vigorously defend our reported positions, and believe the ultimate resolution of the adjustments proposed by the IRS examination team will not have a material adverse effect on our consolidated financial statements. During the third quarter of 2017, the IRS initiated its examination of our 2012, 2013, 2014 and 2015 tax returns.

In previous periods, we reported that Mexican and Brazilian authorities had made significant tax assessments against Paragon Offshore entities, a portion of which related to Noble’s business that operated through Paragon Offshore-retained entities in Mexico and Brazil prior to the spin-off. As a result of the termination of the Separation Agreements, we no longer have any indemnity obligations in respect of these tax claims made against Paragon Offshore entities, and responsibility for these claims has reverted back to the applicable Paragon Offshore entity. Audit claims of approximately $48.3 million attributable to income and other business taxes have been assessed against Noble entities in Mexico.

In previous periods, we also reported that Petrobras had notified us that it was challenging assessments by Brazilian tax authorities of withholding taxes associated with the provision of drilling rigs for its operations in Brazil during 2008 and 2009. Petrobras had also notified us that if Petrobras was ultimately forced to pay such withholding taxes, it would seek reimbursement from Paragon Offshore who would then seek reimbursement from us for the portion of the withholding that was allocable to our drilling rigs. As a result of the termination of the Separation Agreements, we no longer have any indemnity obligation in respect of these withholding claims made against a Paragon Offshore entity, and responsibility for these claims has reverted back to the applicable Paragon Offshore entity.

We operate in a number of countries throughout the world and our tax returns filed in those jurisdictions are subject to review and examination by tax authorities within those jurisdictions. We recognize uncertain tax positions that we believe have a greater than 50 percent likelihood of being sustained. We cannot predict or provide assurance as to the ultimate outcome of any existing or future assessments.

Other legal matters.

We have entered into agreements with certain of our executive officers, as well as certain other employees. These agreements become effective upon a change of control of Noble-UK (within the meaning set forth in the agreements) or a termination of employment in connection with or in anticipation of a change of control, and remain effective for three years thereafter. These agreements provide for compensation and certain other benefits under such circumstances.

We are a defendant in certain claims and litigation arising out of operations in the ordinary course of business, including personal injury claims, the resolution of which, in the opinion of management, will not be material to our financial position, results of operations or cash flows. There is inherent risk in any litigation or dispute and no assurance can be given as to the outcome of these claims.

We lease certain office space and warehouse facilities under cancelable and non-cancelable leases. Rent expense under these arrangements totaled $8.3 million, $7.8 million and $8.7 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The table below depicts future minimum rental commitments under our operating leases as of December 31, 2017:

2018		2019		2020		2021		2022		Thereafter		Total
$	18,720	$	14,046	$	2,564	$	1,853	$	1,586	$	3,840	$	42,609

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Segment and Related Information

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Segment and Related Information

Note 15— Segment and Related Information

We report our contract drilling operations as a single reportable segment, Contract Drilling Services, which reflects how we manage our business. The mobile offshore drilling units comprising our offshore rig fleet operate in a global market for contract drilling services and are often redeployed to different regions due to changing demands of our customers, which consist primarily of large, integrated, independent and government-owned or controlled oil and gas companies throughout the world. As of December 31, 2017, our contract drilling services segment conducts contract drilling operations in Canada, Far East Asia, the Middle East, the North Sea, Oceania, South America and the Gulf of Mexico.

The following table presents revenues and identifiable assets by country based on the location of the service provided:

	Revenues for Year Ended December 31,							Identifiable Assets as of December 31,
	2017			2016		2015		2017		2016
Africa	$	48,228		$	1,803	$	—	$	—	$	673,486
Argentina	—			51,627		111,589		—		—
Australia	12,262			89,847		204,822		257,415		—
Brazil	—			27,640		78,683		25,645		25,474
Brunei	45,450			42,710		—		119		312,494
Bulgaria	55,145			78,985		—		657,806		—
Canada	1,639			—		—		238,902		—
Curacao	—			—		—		647,554		—
Denmark	44,671			46,342		77,934		250,851		250,776
Gabon	—			23,385		90,082		8,378		—
Libya	—			—		136,406		—		—
Malaysia	131,696			168,826		149,597		293,297		747,059
Mexico	—			—		—		27,391		—
Qatar	16,488			608		—		—		263,108
Saudi Arabia	140,453			120,132		226,251		455,296		443,965
Singapore	—			—		—		911,515		230,897
Suriname	13,034			—		—		—		—
Tanzania	1,526			48,394		—		—		—
The Netherlands	—			42		67,765		—		—
Turkey	(3		)	—		97,065		—		—

United Arab Emirates	99,825		86,446		67,117		590,863		591,306
United Kingdom	209,338		95,621		87,896		894,902		1,475,651
United States	417,163		1,404,365		1,941,485		5,534,725		6,399,119
Other	—		15,292		15,560		—		26,782
Total	$	1,236,915	$	2,302,065	$	3,352,252	$	10,794,659	$	11,440,117

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Supplemental Financial Information

12 Months Ended

Dec. 31, 2017

Supplemental Financial Information [Abstract]

Supplemental Financial Information

Note 16— Supplemental Financial Information

Consolidated Balance Sheets Information

Deferred revenues from drilling contracts totaled $114.3 million and $134.4 million at December 31, 2017 and 2016, respectively. Such amounts are included in either “Other current liabilities” or “Other liabilities” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition. Related expenses deferred under drilling contracts totaled $55.7 million at December 31, 2017 as compared to $72.8 million at December 31, 2016, and are included in either “Prepaid expenses and other current assets,” “Other assets” or “Property and equipment, net” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

In April 2015, we agreed to contract dayrate reductions for five rigs working for Saudi Arabian Oil Company (“Saudi Aramco”), which were effective from January 1, 2015 through December 31, 2015. These rates were once again adjusted downward in 2016 to the adjusted 2015 levels for the then-operating rigs. Given current market conditions and based on discussions with the customer, we do not expect the rates to return to the original contract rates on the remaining terms of the contracts. In accordance with accounting standards, we are recognizing the reductions on a straight-line basis over the remaining life of the existing Saudi Aramco contracts. At December 31, 2017 and 2016 revenues recorded in excess of billings as a result of this recognition totaled $6.9 million and $17.9 million, respectively, of which $6.9 million and $9.2 million, respectively, are included in “Prepaid expenses and other current assets” and $8.7 million, as of December 31, 2016, is included in “Other assets,” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

Consolidated Statements of Cash Flows Information

The net effect of changes in other assets and liabilities on cash flows from operating activities is as follows:

	Noble-UK									Noble-Cayman
	December 31,									December 31,
	2017			2016			2015			2017			2016			2015
Accounts receivable	$	114,456		$	179,779		$	70,165		$	114,456		$	179,779		$	70,165
Other current assets	(23,710		)	81,702			61,514			(26,556		)	79,682			23,047
Other assets	(87,377		)	139,872			106,354			(89,591		)	137,792			89,877
Accounts payable	22,638			(84,873		)	(30,771		)	22,834			(83,085		)	(28,538		)
Other current liabilities	34,568			(209,739		)	(54,940		)	35,695			(205,969		)	(34,024		)
Other liabilities	(81,812		)	(19,617		)	(26,219		)	(76,929		)	(20,960		)	(25,562		)
	$	(21,237	)	$	87,124		$	126,103		$	(20,091	)	$	87,239		$	94,965

Additional cash flow information is as follows: 

	Noble - UK						Noble - Cayman
	December 31,						December 31,
	2017		2016		2015		2017		2016		2015
Cash paid during the period for:
Interest, net of amounts capitalized	$	246,960	$	232,907	$	190,917	$	246,960	$	232,907	$	190,917
Income taxes (net of refunds)	$	30,590	$	100,544	$	89,292	$	30,590	$	100,717	$	88,948
Non-cash activities during the period:
Spin-off of Paragon Offshore	N/A		N/A		N/A		N/A		N/A		N/A

In accordance with our adoption of ASU No. 2016-9, prior period excess tax benefits, which were previously classified as a financing activity in “Employee stock transactions,” are now classified as an operating activity in “Net change in other assets and liabilities” on our Consolidated Statement of Cash Flows and current period excess tax benefits are now recognized in our Consolidated Statement of Operations through income taxes. Additionally, shares withheld for taxes on employee stock transactions, which were previously classified as an operating activity in “Net change in other assets and liabilities,” are now classified as a financing activity in “Employee stock transactions” on our Consolidated Statement of Cash Flows.

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Condensed Consolidating Financial Information

12 Months Ended

Dec. 31, 2017

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Consolidating Financial Information

Note 17— Condensed Consolidating Financial Information

Guarantees of Registered Securities

Noble-Cayman, or one or more 100 percent owned subsidiaries of Noble-Cayman, is a co-issuer or full and unconditional guarantor or otherwise obligated as of December 31, 2017 as follows:

	Issuer
Notes	(Co-Issuer(s))	Guarantor
$250 million 5.75% Senior Notes due 2018	NHIL	Noble-Cayman
$202 million 7.50% Senior Notes due 2019	NHUS	Noble-Cayman
	Noble Drilling Holding, LLC (“NDH” )
	Noble Drilling Services 6 LLC (“NDS6”)
$168 million 4.90% Senior Notes due 2020	NHIL	Noble-Cayman
$209 million 4.625% Senior Notes due 2021	NHIL	Noble-Cayman
$126 million 3.95% Senior Notes due 2022	NHIL	Noble-Cayman
$1 billion 7.75% Senior Notes due 2024	NHIL	Noble-Cayman
$450 million 7.70% Senior Notes due 2025	NHIL	Noble-Cayman
$400 million 6.20% Senior Notes due 2040	NHIL	Noble-Cayman
$400 million 6.05% Senior Notes due 2041	NHIL	Noble-Cayman
$500 million 5.25% Senior Notes due 2042	NHIL	Noble-Cayman
$400 million 8.70% Senior Notes due 2045	NHIL	Noble-Cayman

The following consolidating financial statements of Noble-Cayman, NHUS, NDH, NHIL, NDS6 and all other subsidiaries present investments in both consolidated and unconsolidated affiliates using the equity method of accounting.

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble - Cayman		NHUS		NDH			NHIL		NDS6		Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	11	$	—	$	23,160		$	29,324	$	—	$	609,516		$	—		$	662,011
Accounts receivable	—		—		24,722			—		—		179,974			—			204,696
Taxes receivable	—		93,302		3			—		—		12,040			—			105,345
Short-term notes receivable from affiliates	—		—		119,476			—		2,373,452		—			(2,492,928		)	—
Accounts receivable from affiliates	594,456		1,454		144,367			60,945		465,749		5,813,846			(7,080,817		)	—
Prepaid expenses and other current assets	—		—		1,477			—		1		63,963			—			65,441
Total current assets	594,467		94,756		313,205			90,269		2,839,202		6,679,339			(9,573,745		)	1,037,493
Property and equipment, at cost	—		—		857,784			—		—		11,176,547			—			12,034,331
Accumulated depreciation	—		—		(110,005		)	—		—		(2,435,086		)	—			(2,545,091		)
Property and equipment, net	—		—		747,779			—		—		8,741,461			—			9,489,240
Notes receivable from affiliates	3,177,248		—		1,199,815			—		3,943,299		1,175,300			(9,495,662		)	—
Investments in affiliates	4,933,978		4,550,358		5,252,135			12,560,598		7,237,474		—			(34,534,543		)	—
Other assets	2,663		16,775		8,372			—		—		238,718			—			266,528
Total assets	$	8,708,356	$	4,661,889	$	7,521,306		$	12,650,867	$	14,019,975	$	16,834,818		$	(53,603,950	)	$	10,793,261
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables to affiliates	$	—	$	1,605,243	$	—		$	—	$	—	$	887,685		$	(2,492,928	)	$	—
Current maturities of long-term debt	—		—		—			249,843		—		—			—			249,843
Accounts payable	—		—		1,467			—		—		82,406			—			83,873
Accrued payroll and related costs	—		—		4,780			—		—		50,124			—			54,904
Accounts payable to affiliates	3,410,669		393,073		1,770,066			661,375		—		845,634			(7,080,817		)	—
Taxes payable	—		—		—			—		—		33,965			—			33,965
Interest payable	2,211		—		—			83,960		12,018		—			—			98,189
Other current liabilities	—		—		5,169			—		—		66,297			—			71,466
Total current liabilities	3,412,880		1,998,316		1,781,482			995,178		12,018		1,966,111			(9,573,745		)	592,240
Long-term debt	—		—		—			3,594,332		201,535		—			—			3,795,867
Notes payable to affiliates	—		700,000		474,637			3,175,663		—		5,145,362			(9,495,662		)	—
Deferred income taxes	—		—		5			—		—		164,957			—			164,962
Other liabilities	19,929		—		30,330			—		—		239,919			—			290,178
Total liabilities	3,432,809		2,698,316		2,286,454			7,765,173		213,553		7,516,349			(19,069,407		)	4,843,247
Commitments and contingencies
Total shareholder equity	5,275,547		1,963,573		5,234,852			4,885,694		13,806,422		8,644,002			(34,534,543		)	5,275,547
Noncontrolling interests	—		—		—			—		—		674,467			—			674,467
Total equity	5,275,547		1,963,573		5,234,852			4,885,694		13,806,422		9,318,469			(34,534,543		)	5,950,014
Total liabilities and equity	$	8,708,356	$	4,661,889	$	7,521,306		$	12,650,867	$	14,019,975	$	16,834,818		$	(53,603,950	)	$	10,793,261

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman		NHUS		NDH			NHIL		NDS6		Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	2,537	$	—	$	10,855		$	—	$	—	$	640,441		$	—		$	653,833
Accounts receivable	—		—		33,162			—		—		285,990			—			319,152
Taxes receivable	—		21,428		—			—		—		34,052			—			55,480
Short-term notes receivable from affiliates	—		—		243,915			—		1,349,708		52,611			(1,646,234		)	—
Accounts receivable from affiliates	361,313		—		137,476			67,560		85,274		3,038,658			(3,690,281		)	—
Prepaid expenses and other current assets	270		—		1,611			—		—		86,868			—			88,749
Total current assets	364,120		21,428		427,019			67,560		1,434,982		4,138,620			(5,336,515		)	1,117,214
Property and equipment, at cost	—		—		2,376,862			—		—		9,988,026			—			12,364,888
Accumulated depreciation	—		—		(428,308		)	—		—		(1,874,632		)	—			(2,302,940		)
Property and equipment, net	—		—		1,948,554			—		—		8,113,394			—			10,061,948
Notes receivable from affiliates	3,304,672		—		112,706			69,564		5,000		1,798,614			(5,290,556		)	—
Investments in affiliates	2,848,855		2,007,016		1,411,874			8,369,728		6,129,082		—			(20,766,555		)	—
Other assets	4,292		—		5,687			—		—		168,573			—			178,552
Total assets	$	6,521,939	$	2,028,444	$	3,905,840		$	8,506,852	$	7,569,064	$	14,219,201		$	(31,393,626	)	$	11,357,714
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables to affiliates	$	—	$	171,925	$	—		$	—	$	—	$	1,474,309		$	(1,646,234	)	$	—
Current maturities of long-term debt	—		—		—			299,882		—		—			—			299,882
Accounts payable	—		—		4,228			—		—		103,640			—			107,868
Accrued payroll and related costs	—		—		4,882			—		—		43,437			—			48,319
Accounts payable to affiliates	818,737		111,801		1,995,788			123,642		—		640,313			(3,690,281		)	—
Taxes payable	—		—		—			—		—		46,561			—			46,561
Interest payable	48		—		—			56,839		4,412		—			—			61,299
Other current liabilities	12		—		4,296			—		—		63,004			—			67,312
Total current liabilities	818,797		283,726		2,009,194			480,363		4,412		2,371,264			(5,336,515		)	631,241
Long-term debt	—		—		—			3,838,807		201,422		—			—			4,040,229
Notes payable to affiliates	—		700,000		467,139			744,181		—		3,379,236			(5,290,556		)	—
Deferred income taxes	—		—		534			—		—		1,550			—			2,084
Other liabilities	19,929		—		24,035			—		—		248,219			—			292,183
Total liabilities	838,726		983,726		2,500,902			5,063,351		205,834		6,000,269			(10,627,071		)	4,965,737
Commitments and contingencies
Total shareholder equity	5,683,213		1,044,718		1,404,938			3,443,501		7,363,230		7,106,323			(20,362,710		)	5,683,213
Noncontrolling interests	—		—		—			—		—		1,112,609			(403,845		)	708,764
Total equity	5,683,213		1,044,718		1,404,938			3,443,501		7,363,230		8,218,932			(20,766,555		)	6,391,977
Total liabilities and equity	$	6,521,939	$	2,028,444	$	3,905,840		$	8,506,852	$	7,569,064	$	14,219,201		$	(31,393,626	)	$	11,357,714

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	168,592		$	—		$	—		$	1,086,320		$	(47,886	)	$	1,207,026
Reimbursables and other	—			—			3,443			—			—			26,446			—			29,889
Total operating revenues	—			—			172,035			—			—			1,112,766			(47,886		)	1,236,915
Operating costs and expenses
Contract drilling services	304			12,090			43,161			3,115			—			627,251			(47,886		)	638,035
Reimbursables	—			—			1,992			—			—			16,443			—			18,435
Depreciation and amortization	—			—			58,236			—			—			484,883			—			543,119
General and administrative	129			5,761			—			1,588			9			33,600			—			41,087
Loss on impairment	—			—			45,012			—			—			76,627			—			121,639
Total operating costs and expenses	433			17,851			148,401			4,703			9			1,238,804			(47,886		)	1,362,315
Operating income (loss)	(433		)	(17,851		)	23,634			(4,703		)	(9		)	(126,038		)	—			(125,400		)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	(476,382		)	(528,702		)	82,596			188,809			17,874			—			715,805			—
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax	2,967			4,566			—			—			—			—			(7,533		)	—
Interest expense, net of amounts capitalized	(10,951		)	(32,838		)	(13,493		)	(430,580		)	(15,288		)	(130,442		)	341,603			(291,989		)
Interest income and other, net	10,483			(141		)	87,287			4,771			224,772			19,716			(341,603		)	5,285
Income (loss) before income taxes	(474,316		)	(574,966		)	180,024			(241,703		)	227,349			(236,764		)	708,272			(412,104		)
Income tax benefit (provision)	—			241,960			(440		)	—			—			(284,115		)	—			(42,595		)
Net income (loss) from continuing operations	(474,316		)	(333,006		)	179,584			(241,703		)	227,349			(520,879		)	708,272			(454,699		)
Net income (loss) from discontinuing operations, net of tax	—			(1,598		)	—			—			—			4,565			—			2,967
Net income (loss)	(474,316		)	(334,604		)	179,584			(241,703		)	227,349			(516,314		)	708,272			(451,732		)
Net (income) loss attributable to noncontrolling interests	—			—			—			—			—			(20,589		)	(1,995		)	(22,584		)
Net income (loss) attributable to Noble Corporation	(474,316		)	(334,604		)	179,584			(241,703		)	227,349			(536,903		)	706,277			(474,316		)
Other comprehensive income (loss), net	9,252			—			—			—			—			9,252			(9,252		)	9,252
Comprehensive income (loss) attributable to Noble Corporation	$	(465,064	)	$	(334,604	)	$	179,584		$	(241,703	)	$	227,349		$	(527,651	)	$	697,025		$	(465,064	)

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	250,049		$	—		$	—		$	2,086,848		$	(94,697	)	$	2,242,200
Reimbursables and other	—			—			9,190			—			—			51,375			—			60,565
Total operating revenues	—			—			259,239			—			—			2,138,223			(94,697		)	2,302,765
Operating costs and expenses
Contract drilling services	4,532			18,902			70,801			84,309			—			789,814			(94,697		)	873,661
Reimbursables	—			—			8,231			—			—			37,268			—			45,499
Depreciation and amortization	—			—			91,802			—			—			519,211			—			611,013
General and administrative	1,264			8,716			—			40,082			1			(4,018		)	—			46,045
Loss on impairment	—			—			—			—			—			1,458,749			—			1,458,749
Total operating costs and expenses	5,796			27,618			170,834			124,391			1			2,801,024			(94,697		)	3,034,967
Operating income (loss)	(5,796		)	(27,618		)	88,405			(124,391		)	(1		)	(662,801		)	—			(732,202		)
Other income (expense)
Income (loss) of unconsolidated affiliates	(962,662		)	(257,142		)	(980,099		)	(333,446		)	515,518			—			2,017,831			—
Interest expense, net of amounts capitalized	(27,891		)	(70,494		)	(11,461		)	(228,423		)	(15,117		)	(122,345		)	252,816			(222,915		)
Gain on extinguishment of debt, net	—			—			—			17,814			—			—			—			17,814
Interest income and other, net	96,635			120			12,616			20,412			15,058			108,108			(252,816		)	133
Income (loss) before income taxes	(899,714		)	(355,134		)	(890,539		)	(648,034		)	515,458			(677,038		)	2,017,831			(937,170		)
Income tax benefit (provision)	—			(42,522		)	163			—			—			151,522			—			109,163
Net Income (loss)	(899,714		)	(397,656		)	(890,376		)	(648,034		)	515,458			(525,516		)	2,017,831			(828,007		)
Net income attributable to noncontrolling interests	—			—			—			—			—			(39,294		)	(32,413		)	(71,707		)
Net income (loss) attributable to Noble Corporation	(899,714		)	(397,656		)	(890,376		)	(648,034		)	515,458			(564,810		)	1,985,418			(899,714		)
Other comprehensive income (loss), net	11,035			—			—			—			—			11,035			(11,035		)	11,035
Comprehensive income (loss) attributable to Noble Corporation	$	(888,679	)	$	(397,656	)	$	(890,376	)	$	(648,034	)	$	515,458		$	(553,775	)	$	1,974,383		$	(888,679	)

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF INCOME and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2015

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL				NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	354,657		$	—			$	—		$	3,325,608		$	(418,655	)	$	3,261,610
Reimbursables and other	—			—			18,529			—				—			72,313			—			90,842
Total operating revenues	—			—			373,186			—				—			3,397,921			(418,655		)	3,352,452
Operating costs and expenses
Contract drilling services	3,611			19,160			395,365			84,005				—			1,142,891			(418,655		)	1,226,377
Reimbursables	—			—			13,686			—				—			56,590			—			70,276
Depreciation and amortization	—			—			77,187			—				—			556,057			—			633,244
General and administrative	1,138			8,683			—			38,167				1			7,446			—			55,435
Loss on impairment	—			—			13			—				—			418,285			—			418,298
Total operating costs and expenses	4,749			27,843			486,251			122,172			—	1			2,181,269			(418,655		)	2,403,630
Operating income (loss)	(4,749		)	(27,843		)	(113,065		)	(122,172		)		(1		)	1,216,652			—			948,822
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	591,297			73,319			190,335			936,429				647,856			—			(2,439,236		)	—
Interest expense, net of amounts capitalized	(75,925		)	(4,932		)	(12,110		)	(224,894		)		(25,578		)	(68,670		)	198,255			(213,854		)
Gain on extinguishment of debt, net	—			—			—			—				—			—			—			—
Interest income and other, net	24,188			4,852			52,026			71,617				5,165			75,071			(198,255		)	34,664
Income (loss) from continuing operations before income taxes	534,811			45,396			117,186			660,980				627,442			1,223,053			(2,439,236		)	769,632
Income tax provision	—			(77,929		)	(4,466		)	—				—			(80,225		)	—			(162,620		)
Net income (loss)	534,811			(32,533		)	112,720			660,980				627,442			1,142,828			(2,439,236		)	607,012
Net (income) loss attributable to noncontrolling interests	—			—			—			—				—			(105,240		)	33,039			(72,201		)
Net income (loss) attributable to Noble Corporation	534,811			(32,533		)	112,720			660,980				627,442			1,037,588			(2,406,197		)	534,811
Other comprehensive income (loss), net	6,243			—			—			—				—			6,243			(6,243		)	6,243
Comprehensive income (loss) attributable to Noble Corporation	$	541,054		$	(32,533	)	$	112,720		$	660,980			$	627,442		$	1,043,831		$	(2,412,440	)	$	541,054

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments		Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	32,195		$	100,883		$	209,898		$	(403,391	)	$	217,080		$	335,672		$	—	$	492,337
Cash flows from investing activities
Capital expenditures	—			—			(3,622		)	—			—			(154,348		)	—		(157,970		)
Proceeds from disposal of assets	—			—			46			—			—			2,336			—		2,382
Net cash used in investing activities	—			—			(3,576		)	—			—			(152,012		)	—		(155,588		)
Cash flows from financing activities
Repayment of long-term debt	—			—			—			(300,000		)	—			—			—		(300,000		)
Debt issuance costs on senior notes and credit facility	—			—			—			(42		)	—			—			—		(42		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(56,881		)	—		(56,881		)
Contributions from parent company, net	28,352			—			—			—			—			—			—		28,352
Advances (to) from affiliates	(63,073		)	(100,883		)	(194,017		)	732,757			(217,080		)	(157,704		)	—		—
Net cash provided by (used in) financing activities	(34,721		)	(100,883		)	(194,017		)	432,715			(217,080		)	(214,585		)	—		(328,571		)
Net change in cash and cash equivalents	(2,526		)	—			12,305			29,324			—			(30,925		)	—		8,178
Cash and cash equivalents, beginning of period	2,537			—			10,855			—			—			640,441			—		653,833
Cash and cash equivalents, end of period	$	11		$	—		$	23,160		$	29,324		$	—		$	609,516		$	—	$	662,011

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments		Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	97,388		$	(150,735	)	$	149,431		$	(344,112	)	$	(60	)	$	1,404,359		$	—	$	1,156,271
Cash flows from investing activities
Capital expenditures	—			—			(492,985		)	—			—			(201,754		)	—		(694,739		)
Proceeds from disposal of assets	—			—			—			—			—			24,808			—		24,808
Net cash used in investing activities	—			—			(492,985		)	—			—			(176,946		)	—		(669,931		)
Cash flows from financing activities
Repayment of long-term debt	—			—			—			(1,049,338		)	—			—			—		(1,049,338		)
Issuance of senior notes	—			—			—			980,100			—			—			—		980,100
Tender offer premium	—			—			—			(24,649		)	—			—			—		(24,649		)
Debt issuance costs on senior notes and credit facilities	—			—			—			(12,111		)	—			—			—		(12,111		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(85,944		)	—		(85,944		)
Distributions to parent company, net	(152,360		)	—			—			—			—			—			—		(152,360		)
Advances (to) from affiliates	55,882			150,735			352,308			450,110			60			(1,009,095		)	—		—
Net cash provided by (used in) financing activities	(96,478		)	150,735			352,308			344,112			60			(1,095,039		)	—		(344,302		)
Net change in cash and cash equivalents	910			—			8,754			—			—			132,374			—		142,038
Cash and cash equivalents, beginning of period	1,627			—			2,101			—			—			508,067			—		511,795
Cash and cash equivalents, end of period	$	2,537		$	—		$	10,855		$	—		$	—		$	640,441		$	—	$	653,833

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2015

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	(31,562	)	$	(53,686	)	$	15,207		$	(267,735	)	$	(20,292	)	$	2,105,575		$	—		$	1,747,507
Cash flows from investing activities
Capital expenditures	—			—			(116,594		)	—			—			(320,557		)	—			(437,151		)
Proceeds from disposal of assets	—			—			—			—			—			4,614			—			4,614
Notes receivable from affiliates	124,951			—			—			608,771			—			—			(733,722		)	—
Net cash provided by (used in) investing activities	124,951			—			(116,594		)	608,771			—			(315,943		)	(733,722		)	(432,537		)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	(1,123,495		)	—			—			—			—			—			—			(1,123,495		)
Repayment of long-term debt	—			—			—			(350,000		)	—			—			—			(350,000		)
Issuance of senior notes	—			—			—			1,092,728			—			—			—			1,092,728
Debt issuance costs on senior notes and credit facilities	(6,450		)	—			—			(9,620		)	—			—			—			(16,070		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(71,504		)	—			(71,504		)
Distributions to parent company, net	(400,614		)	—			—			—			—			—			—			(400,614		)
Notes payable to affiliates	(608,771		)	—			—			—			—			(124,951		)	733,722			—
Advances (to) from affiliates	2,047,563			53,686			103,234			(1,074,144		)	20,292			(1,150,631		)	—			—
Net cash provided by (used in) financing activities	(91,767		)	53,686			103,234			(341,036		)	20,292			(1,347,086		)	733,722			(868,955		)
Net change in cash and cash equivalents	1,622			—			1,847			—			—			442,546			—			446,015
Cash and cash equivalents, beginning of period	5			—			254			—			—			65,521			—			65,780
Cash and cash equivalents, end of period	$	1,627		$	—		$	2,101		$	—		$	—		$	508,067		$	—		$	511,795

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Unaudited Interim Financial Data

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Unaudited Interim Financial Data

Note 18— Unaudited Interim Financial Data

Unaudited interim consolidated financial information from continuing operations for Noble-UK is as follows:

	Quarters Ended
	March 31			June 30			September 30			December 31
2017
Operating revenues	$	362,976		$	278,142		$	266,212		$	329,585
Operating income (loss)	45,847			(43,875		)	(55,588		)	(109,656		)
Net loss from continuing operations	(301,694		)	(91,864		)	(96,792		)	(24,675		)
Net loss from discontinued operations, net of tax	—			(1,486		)	—			—
Net loss per share from continuing operations attributable to Noble-UK (1)
Basic
Net loss from continuing operations	(1.24		)	(0.37		)	(0.40		)	(0.10		)
Net loss from discontinued operations, net of tax	—			(0.01		)	—			—
Diluted
Net loss from continuing operations	(1.24		)	(0.37		)	(0.40		)	(0.10		)
Net loss from discontinued operations, net of tax	—			(0.01		)	—			—

	Quarter Ended
	March 31		June 30		September 30			December 31
2016
Operating revenues	$	611,973	$	894,783	$	385,153		$	410,156
Operating income (loss)	175,460		449,714		(2,208		)	(1,384,912		)
Net income (loss) from continuing operations attributable to Noble-UK	105,485		322,866		(55,081		)	(1,302,850		)
Net income (loss) per share from continuing operations attributable to Noble-UK (1)
Basic
Net income (loss) from continuing operations	0.42		1.28		(0.23		)	(5.36		)
Diluted
Net income (loss) from continuing operations	0.42		1.28		(0.23		)	(5.36		)

⁽¹⁾  Net income (loss) per share is computed independently for each of the quarters presented. Therefore, the sum of the quarters’ net income (loss) per share may not equal the total computed for the year.

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Subsequent Events

12 Months Ended

Dec. 31, 2017

Subsequent Events [Abstract]

Subsequent Events

Note 19— Subsequent Events

2015 Credit Facility Amendment Effectiveness

On January 3, 2018, the Amendment to the 2015 Credit Facility became fully effective. The Amendment caused, among other things a reduction in the aggregate principal amount of commitments under the 2015 Credit Facility to $300.0 million and the reduction of the 2015 Credit Facility's letter of credit sub-facility to zero dollars. The maturity of the 2015 Credit Facility remains January 2020.

2017 Credit Facility Amendment Effectiveness

On January 3, 2018, borrowings up to a maximum aggregate amount of $1.5 billion became available under the 2017 Credit Facility. The 2017 Credit Facility matures in January 2023.

Debt Issuance

On January 31, 2018, NHIL issued and sold $750.0 million aggregate principal amount of the 2026 Notes, through our indirect wholly-owned subsidiary, NHIL. The 2026 Notes are issued under an indenture by and among NHIL, Noble-Cayman, certain other subsidiaries of Noble-Cayman named therein (the “Subsidiary Guarantors”), and are guaranteed by Noble-Cayman and the Guarantor Subsidiaries. The proceeds of the offering of approximately $737.0 million, after estimated expenses, were used to retire a portion of our near-term senior notes in a related tender offer.

The 2026 Notes are redeemable, in whole or in part, prior to February 1, 2021, at a redemption price equal to 100% of the aggregate principal amount of the 2026 Notes being redeemed, plus a make-whole premium. The 2026 Notes are redeemable prior to February 1, 2021, at a redemption price equal to 40% of the aggregate principal amount in the event of an equity offering. Further, the 2026 Notes may be redeemed in whole as a result of changes in tax law. On or after February 1, 2021, we may redeem all or any portion of the 2026 Notes at various redemption prices set forth in the indenture.

Upon (i) the occurrence of a change of control and (ii) a downgrade of the rating of the 2026 Notes within 60 days after the change of control by at least two of Moody’s Investors Service, Inc., Standard & Poor’s Financial Services LLC or Fitch Ratings Inc., We will be required to make an offer to repurchase all outstanding 2026 Notes at a price in cash equal to 101%of the aggregate principal amount of the 2026 Notes repurchased, plus any accrued and unpaid interest to, but excluding, the repurchase date.

The indenture for the 2026 Notes contains certain covenants and restrictions, including, among others, restrictions on our and our subsidiaries’ ability, as applicable, to create certain liens, enter into certain sale and leaseback transactions, merge or consolidate with another entity, sell all or substantially all of their assets and allow our subsidiaries to incur certain additional indebtedness. Additionally, the Subsidiary Guarantors must own, directly or indirectly, (i) assets comprising at least 85% of the revenue of Noble-Cayman and its subsidiaries on a consolidated basis and (ii) jackups, semisubmersibles, drillships, submersibles or other mobile offshore drilling units of material importance, the combined book value of which comprises at least 85% of the combined book value of all such assets of Noble-Cayman and its subsidiaries on a consolidated basis, in each case, with respect to the most recently completed fiscal year.

Tender Offer

In January 2018, we commenced cash tender offers for our 2018 Notes, 2019 Notes, 2020 Notes, 2021 Notes, 2022 Notes and 2024 Notes. On February 1, 2018, we purchased $754.2 million aggregate principal amount of these senior notes for $750.0 million, plus accrued interest, using the net proceeds of the $750.0 million2026 Notes issuance in January 2018 and cash on hand. In February 2018, as a result of this transaction, we recognized a net loss of approximately $2.0 million.

In February 2018, we purchased an aggregate principal amount of $61.9 million of the remaining 2019 Notes for approximately $65.3 million, plus accrued interest, in accordance with the optional redemption feature in our indenture. As a result of this transaction, we recognized a net loss of approximately $3.5 million.

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Organization and Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Noble Corporation plc, a public limited company incorporated under the laws of England and Wales (“Noble-UK”), is a leading offshore drilling contractor for the oil and gas industry. We provide contract drilling services with our global fleet of mobile offshore drilling units. As of December 31, 2017, our fleet consisted of eight drillships, six semisubmersibles and 14 jackups.

We report our contract drilling operations as a single reportable segment, Contract Drilling Services, which reflects how we manage our business. The mobile offshore drilling units comprising our offshore rig fleet operate in a global market for contract drilling services and are often redeployed to different regions due to changing demands of our customers, which consist primarily of large, integrated, independent and government-owned or controlled oil and gas companies throughout the world.

Noble Corporation, a Cayman Islands company (“Noble-Cayman”), is an indirect, wholly-owned subsidiary of Noble-UK, our publicly-traded parent company. Noble-UK’s principal asset is all of the shares of Noble-Cayman. Noble-Cayman has no public equity outstanding. The consolidated financial statements of Noble-UK include the accounts of Noble-Cayman, and Noble-UK conducts substantially all of its business through Noble-Cayman and its subsidiaries.

Consolidation

Principles of Consolidation

The consolidated financial statements include our accounts, those of our wholly-owned subsidiaries and entities in which we hold a controlling financial interest. Our consolidated financial statements also include the accounts of two joint ventures, in each of which we own a 50 percent interest. Our ownership interest meets the definition of variable interest under Financial Accounting Standards Board (“FASB”) codification and we have determined that we are the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.

Prior Period Reclassification

Prior Period Reclassification

We have made certain reclassifications to our prior period amounts in our operating revenue on our Consolidated Statements of Operations by combining our other revenue with reimbursables revenue to conform to the current period presentation. Such reclassification did not have a material effect on our results of operations and had no effect on our financial position or cash flows.

Foreign Currency Translations

Foreign Currency Translation

Although we are a UK company, our functional currency is the U.S. dollar, and we define any non-U.S. dollar denominated currency as “foreign currencies”. In non-U.S. locations where the U.S. Dollar has been designated as the functional currency (based on an evaluation of factors including the markets in which the subsidiary operates, inflation, generation of cash flow, financing activities and intercompany arrangements), local currency transaction gains and losses are included in net income or loss. In non-U.S. locations where the local currency is the functional currency, assets and liabilities are translated at the rates of exchange on the balance sheet date, while statement of operations items are translated at average rates of exchange during the year. The resulting gains or losses arising from the translation of accounts from the functional currency to the U.S. Dollar are included in “Accumulated other comprehensive loss” in the Consolidated Balance Sheets.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, demand deposits with banks and all highly liquid investments with original maturities of three months or less. Our cash, cash equivalents and short-term investments are subject to potential credit risk, and certain of our cash accounts carry balances greater than the federally insured limits. Cash and cash equivalents are primarily held by major banks or investment firms. Our cash management and investment policies restrict investments to lower risk, highly liquid securities and we perform periodic evaluations of the relative credit standing of the financial institutions with which we conduct business.

Accounts Receivable

Accounts Receivable

We record accounts receivable at the amount we invoice our clients, net of allowance for doubtful accounts. We provide an allowance for uncollectible accounts, as necessary.

Property and Equipment

Property and Equipment

Property and equipment is stated at cost, reduced by provisions to recognize economic impairment. Major replacements and improvements are capitalized. When assets are sold, retired or otherwise disposed of, the cost and related accumulated depreciation are eliminated from the accounts and the gain or loss is recognized. Drilling equipment and facilities are depreciated using the straight-line method over their estimated useful lives as of the date placed in service or date of major refurbishment. Estimated useful lives of our drilling equipment range from three to thirty years. Other property and equipment is depreciated using the straight-line method over useful lives ranging from two to forty years. Included in accounts payable were $21.0 million and $25.8 million of capital accruals as of December 31, 2017 and 2016, respectively.

Interest is capitalized on long-term construction project using the weighted average cost of debt outstanding during the period of construction.

Scheduled maintenance of equipment is performed based on the number of hours operated in accordance with our preventative maintenance program. Routine repair and maintenance costs are charged to expense as incurred; however, the costs of the overhauls and asset replacement projects that benefit future periods and which typically occur every three to five years are capitalized when incurred and depreciated over an equivalent period. These overhauls and asset replacement projects are included in “Drilling equipment and facilities” in “Note 5— Property and Equipment.”

We evaluate property and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. For more detailed information, see “Note 6— Impairment.”

Fair Value Measurements

Fair Value Measurements

We measure certain of our assets and liabilities based on a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The three-level hierarchy, from highest to lowest level of observable inputs, are as follows:

Level 1 - Valuations based on quoted prices in active markets for identical assets;

Level 2 - Valuations based on observable inputs that do not meet the criteria for Level 1, including quoted prices in inactive markets and quoted prices in active markets for similar but not identical instruments; and

Level 3 - Valuations based on unobservable inputs.

Revenue Recognition

Revenue Recognition

Our typical dayrate drilling contract revenue, excluding taxes or duty, require our performance of a variety of services for a specified period of time. We determine progress towards completion of the contract by measuring efforts expended and the cost of services required to perform under a drilling contract, as the basis for our revenue recognition. Revenues generated from our dayrate-basis drilling contracts and labor contracts are recognized on a per day basis as services are performed and begin upon the contract commencement, as defined under the specified drilling contract. Dayrate revenues are typically earned, and contract drilling expenses are typically incurred ratably over the term of our drilling contracts. We review and monitor our performance under our drilling contracts to confirm the basis for our revenue recognition. Revenues from bonuses are recognized when earned, and when collectability is reasonably assured.

In our dayrate drilling contracts, we typically receive compensation and incur costs for mobilization, equipment modification or other activities prior to the commencement of a contract. Any such compensation may be paid through a lump-sum payment or other daily compensation. Pre-contract compensation and costs are deferred until the contract commences. The deferred pre-contract compensation and costs are amortized, using the straight-line method, into income or loss over the term of the initial contract period, regardless of the activity taking place. This approach is consistent with the economics for which the parties have contracted. Once a contract commences, we may conduct various activities, including drilling and well bore related activities, rig maintenance and equipment installation, movement between well locations or other activities.

Deferred revenues from drilling contracts totaled $114.3 million and $134.4 million at December 31, 2017 and 2016, respectively. Such amounts are included in either “Other current liabilities” or “Other liabilities” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition. Related expenses deferred under drilling contracts totaled $55.7 million at December 31, 2017 as compared to $72.8 million at December 31, 2016 and are included in either “Prepaid expenses and other current assets,” “Other assets” or “Property and equipment, net” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

In April 2015, we agreed to contract dayrate reductions for five rigs working for Saudi Aramco. Given current market conditions and based on discussions with the customer, we do not expect the rates for the rigs currently working for Saudi Aramco to return to the original contract rates during the remaining contract terms. In accordance with accounting guidance, we are recognizing the rate reductions on a straight-line basis over the remaining life of these Saudi Aramco contracts. At December 31, 2017 and 2016, two of the five original rigs had revenues recorded in excess of billings as a result of this recognition which totaled $6.9 million and $17.9 million, respectively, and are included in either “Prepaid expenses and other current assets” or “Other assets” in the accompanying Consolidated Balance Sheets, based upon our expected time of recognition.

We record reimbursements from customers for “out-of-pocket” expenses as revenues and the related direct cost as operating expenses.

Income Taxes

Income Taxes

Income taxes are based on the laws and rates in effect in the countries in which operations are conducted or in which we or our subsidiaries are considered resident for income tax purposes. In certain circumstances, we expect that, due to changing demands of the offshore drilling markets and the ability to redeploy our offshore drilling units, certain of such units will not reside in a location long enough to give rise to future tax consequences. As a result, no deferred tax asset or liability has been recognized in these circumstances. Should our expectations change regarding the length of time an offshore drilling unit will be used in a given location, we will adjust deferred taxes accordingly.

Deferred tax assets and liabilities are recognized for the anticipated future tax effects of temporary differences between the financial statement basis and the tax basis of our assets and liabilities using the applicable jurisdictional tax rates at year-end. A valuation allowance for deferred tax assets is recorded when it is more likely than not that the deferred tax asset will not be realized in a future period.

We operate through various subsidiaries in numerous countries throughout the world, including the United States. Consequently, we are subject to changes in tax laws, treaties or regulations or the interpretation or enforcement thereof in the U.S., UK or jurisdictions in which we or any of our subsidiaries operate or are resident. Our income tax expense is based upon our interpretation of the tax laws in effect in various countries at the time that the expense was incurred. If the U.S. Internal Revenue Service (“IRS”) or other taxing authorities do not agree with our assessment of the effects of such laws, treaties and regulations, this could have a material adverse effect on us including the imposition of a higher effective tax rate on our worldwide earnings or a reclassification of the tax impact of our significant corporate restructuring transactions.

Insurance Reserves

Insurance Reserves

We maintain various levels of self-insured retention for certain losses including property damage, loss of hire, employment practices liability, employers’ liability and general liability, among others. We accrue for property damage and loss of hire charges on a per event basis.

Employment practices liability claims are accrued based on actual claims during the year. Maritime employer’s liability claims are generally estimated using actuarial determinations. General liability claims are estimated by our internal claims department by evaluating the facts and circumstances of each claim (including incurred but not reported claims) and making estimates based upon historical experience with similar claims.

Earnings per Share

Earnings per Share

Our unvested share-based payment awards, which contain non-forfeitable rights to dividends, are participating securities and are included in the computation of earnings per share pursuant to the two-class method. The two-class method allocates undistributed earnings between common shares and participating securities. The diluted earnings per share calculation under the two-class method also includes the dilutive effect of potential shares issued in connection with stock options. The dilutive effect of stock options is determined using the treasury stock method.

Share-Based Compensation Plans

Share-Based Compensation Plans

We record the grant date fair value of share-based compensation arrangements as compensation cost using a straight-line method over the service period. Share-based compensation is expensed or capitalized based on the nature of the employee’s activities.

Discontinued Operations

Discontinued Operations

On August 1, 2014, Noble-UK completed the separation and spin-off of a majority of its standard specification offshore drilling business through a pro rata distribution of all of the ordinary shares of its wholly-owned subsidiary, Paragon Offshore, to the holders of Noble’s ordinary shares (the “Spin-off”). Paragon Offshore, which had been reflected as continuing operations in our consolidated financial statements prior to the Spin-off, meets the criteria for being reported as discontinued operations and has been reclassified as such in our results of operations.

Certain Significant Estimates

Certain Significant Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Certain accounting policies involve judgments and uncertainties to such an extent that there is reasonable likelihood that materially different amounts could have been reported under different conditions, or if different assumptions had been used. We evaluate our estimates and assumptions on a regular basis. We base our estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates and assumptions used in preparation of our consolidated financial statements.

Accounting Pronouncements

Accounting Standards Adopted

In March 2016, the FASB issued ASU No. 2016-9, which amends ASC Topic 718, “Compensation – Stock Compensation.” This amendment simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. This standard is effective for interim and annual reporting periods beginning after December 31, 2016 and we adopted the standard as of January 1, 2017. Under the new provision, current period excess tax benefits related to stock compensation are now recognized in our Consolidated Statement of Operations in “Provision for income taxes,” rather than on our Consolidated Balance Sheet and Consolidated Statement of Cash Flows. This update has been applied on a prospective basis. Changes to our Consolidated Statement of Cash Flows related to the reclassification of prior period excess tax benefits and employee taxes paid for share-based payment arrangements have been implemented on a retrospective basis. In accordance with our adoption of this update, prior period excess tax benefits of approximately $5.5 million and $1.6 million, previously classified as a financing activity in “Employee stock transactions” in the Consolidated Statement of Cash Flows for the year ended December 31, 2016 and 2015, respectively, are now classified as an operating activity in “Net change in other assets and liabilities” on the accompanying Consolidated Statement of Cash Flows for the comparative periods. Additionally, prior period employee taxes paid for share-based payment arrangements of approximately $3.2 million and $4.1 million, previously classified as an operating activity in “Net change in other assets and liabilities” in the Consolidated Statement of Cash Flows for the year ended December 31, 2016 and 2015, respectively, are now classified as a financing activity in “Employee stock transactions” on the accompanying Consolidated Statement of Cash Flows for the comparative periods.

Recently Issued Accounting Standards

In May 2014, the FASB issued ASU No. 2014-9, which creates Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers,” and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, ASU No. 2014-9 supersedes the cost guidance in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts,” and creates new Subtopic 340-40, “Other Assets and Deferred Costs—Contracts with Customers.” In summary, the core principle of Topic 606 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The amendments in ASU No. 2014-9 are effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period, and early application is permitted for periods beginning after December 15, 2016. We have formed an implementation work team, completed training on ASC Topic 606 and are finishing a project to review relevant contracts. We have adopted the new standard effective January 1,2018under the modified retrospective approach.With respect to our revenue recognized, as of December 31, 2017, we have qualitatively assessed that the effect of adoption will have an impact to deferred revenues in either “Other current liabilities” or “Other liabilities”, to revenues recorded in excess of billings recorded in “Prepaid expenses and other current assets,” and the net impact recorded to “Retained earnings” on our accompanying Consolidated Balance Sheets. Quantitatively, we estimate that the effect of our retrospective adoption will be immaterial. Therefore, with respect to our modified retrospective adoption, we do not anticipate a change to our financial presentation on our Consolidated Balance Sheets as of December 31, 2017.

In February 2016, the FASB issued ASU No. 2016-2, which creates ASC Topic 842, “Leases.” This update increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. Our adoption, and the ultimate effect on our consolidated financial statements, will be based on an evaluation of the contract-specific facts and circumstances. We expect to adopt ASC 842 effective January 1, 2019. We expect to apply the modified retrospective approach to our adoption. Our adoption will have an impact on how our consolidated financial statements and related disclosures will be presented. With respect to leases whereby we are the lessee, we are currently expecting to recognize lease liabilities and offsetting “right of use” assets upon adoption. We are currently evaluating any other impacts ASC 842, including any newly issued guidance, will have on our consolidated financial statements and related disclosures. To facilitate that evaluation, we have completed training on the ASU, formed an implementation team and started the review and documentation of contracts.

In October 2016, the FASB issued ASU No. 2016-16 which amends ASC Topic 740, “Income Taxes.” The amendments in this update improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This standard is effective for interim and annual reporting periods beginning after December 15, 2017 and will be applied on a modified retrospective basis. As a result of the modified retrospective application, we will reduce “Other assets” in our Consolidated Balance Sheet with a cumulative adjustment to retained earnings of approximately $148.0 million as of January 1, 2018.

In February 2017, the FASB issued ASU No. 2017-6, which amends ASC Topic 960, “Defined Benefit Pension Plans,” ASC Topic 962, “Defined Contribution Pension Plans” and ASC Topic 965, “Health and Welfare Benefit Plans.” The amendments in this update clarify presentation requirements for an employee benefit plan’s interest in a master trust and require more detailed disclosures of the plan’s interest in the master trust. The amendments also eliminate a redundancy relating to 401(h) account disclosures. This standard is effective for fiscal years beginning after December 15, 2018, with early application permitted. We are evaluating what impact, if any, the adoption of this guidance will have on our financial condition, results of operations, cash flows or financial disclosures.

In February 2018, the FASB issued ASU No. 2018-2, which amends ASC Topic 220, “Income Statement—Reporting Comprehensive Income.” The amendments in this update allow for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Act. This standard is effective for interim and annual reporting periods beginning after December 15, 2018; however, we expect to early adopt ASC 220 effective January 1, 2018. The amendment should be applied on a retrospective basis to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Act is recognized. As a result of the retrospective application, we will reduce “Accumulated Other Comprehensive Income” with a cumulative adjustment to “Retained Earnings” of approximately $5.5 million as of January 1, 2018.

With the exception of the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our consolidated financial statements.

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share for Noble-UK

The following table presents the computation of basic and diluted earnings per share for Noble-UK:

	Year Ended December 31,
	2017			2016			2015
Numerator:
Basic
Net income (loss) attributable to Noble-UK	$	(516,511	)	$	(929,580	)	$	511,000
Net income (loss) from discontinued operations, net of tax	1,486			—			—
Earnings allocated to unvested share-based payment awards	—			—			(10,856		)
Net income (loss) from continuing operations to common shareholders - basic	$	(515,025	)	$	(929,580	)	$	500,144
Diluted
Net income (loss) attributable to Noble-UK	$	(516,511	)	$	(929,580	)	$	511,000
Net income (loss) from discontinued operations, net of tax	1,486			—			—
Net income (loss) from continuing operations to common shareholders - diluted	$	(515,025	)	$	(929,580	)	$	511,000
Denominator:
Weighted average shares outstanding - basic	244,743			243,127			242,146
Incremental shares issuable from assumed exercise of stock options and unvested share-based payment awards	—			—			5,256
Weighted average shares outstanding - diluted	244,743			243,127			247,402
Earnings per share
Basic:
Income (loss) from continuing operations	$	(2.10	)	$	(3.82	)	$	2.06
Income (loss) from discontinued operations	(0.01		)	—			—
Net income (loss) attributable to Noble-UK	$	(2.11	)	$	(3.82	)	$	2.06
Diluted:
Income (loss) from continuing operations	$	(2.10	)	$	(3.82	)	$	2.06
Income (loss) from discontinued operations	(0.01		)	—			—
Net income (loss) attributable to Noble-UK	$	(2.11	)	$	(3.82	)	$	2.06
Dividends per share	$	—		$	0.20		$	1.28

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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment, at Cost

Property and equipment, at cost, for Noble-UK consisted of the following:

	Year Ended December 31,
	2017		2016
Drilling equipment and facilities	$	11,746,629	$	12,048,571
Construction in progress	83,509		112,103
Other	204,193		204,214
Property and equipment, at cost	$	12,034,331	$	12,364,888

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Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Maturities of Long-term Debt

At December 31, 2017, aggregate principal repayments of total debt for the next five years and thereafter are as follows:

2018		2019		2020		2021		2022		Thereafter		Total
$	250,000	$	201,695	$	167,766	$	208,675	$	125,661	$	3,150,000	$	4,103,797

Schedule of Debt

The following table presents the carrying value and the estimated fair value of our total debt, not including the effect of unamortized debt issuance costs, respectively:

	December 31, 2017						December 31, 2016
	Carrying Value			Estimated Fair Value			Carrying Value			Estimated Fair Value
Senior unsecured notes
2.50% Senior Notes due March 2017	$	—		$	—		$	299,992		$	299,128
5.75% Senior Notes due March 2018	249,959			250,830			249,771			249,808
7.50% Senior Notes due March 2019	201,695			206,881			201,695			209,524
4.90% Senior Notes due August 2020	167,625			163,283			167,576			167,329
4.625% Senior Notes due March 2021	208,568			195,687			208,538			196,416
3.95% Senior Notes due March 2022	125,518			107,348			125,488			112,791
7.75% Senior Notes due January 2024	982,301			861,160			980,117			945,317
7.70% Senior Notes due April 2025	449,008			380,732			448,909			423,267
6.20% Senior Notes due August 2040	399,900			274,988			399,898			280,221
6.05% Senior Notes due March 2041	397,800			273,988			397,758			273,854
5.25% Senior Notes due March 2042	498,400			315,430			498,369			325,814
8.70% Senior Notes due April 2045	394,659			320,396			394,613			328,608
Total debt	4,075,433			3,350,723			4,372,724			3,812,077
Less: Unamortized debt issuance costs	(29,723		)				(32,613		)
Less: Current maturities of long-term debt (1)	(249,843		)	(250,830		)	(299,882		)	(299,128		)
Long-term debt, net of debt issuance costs	$	3,795,867		$	3,099,893		$	4,040,229		$	3,512,949

⁽¹⁾  Presented net of current portion of unamortized debt issuance costs of $0.1 million and $0.1 million at December 31, 2017 and 2016, respectively.

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Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Summary of Stock Options Granted

A summary of the status of stock options granted under both the 1991 Plan and 1992 Plan as of December 31, 2017, 2016 and 2015 and the changes during the year ended on those dates is presented below:

	2017				2016				2015
	Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options		Weighted Average Exercise Price		Number of Shares Underlying Options		Weighted Average Exercise Price
Outstanding at beginning of year	1,420,175		$	29.52	1,677,154		$	29.48	1,958,633		$	28.43
Expired	(107,020	)	29.74		(256,979	)	29.22		(281,479	)	22.17
Outstanding at end of year (1)	1,313,155		29.51		1,420,175		29.52		1,677,154		29.48
Exercisable at end of year (1)	1,313,155		$	29.51	1,420,175		$	29.52	1,677,154		$	29.48

⁽¹⁾  Options outstanding and exercisable at December 31, 2017 had no intrinsic value.

Additional Information about Stock Options Outstanding

The following table summarizes additional information about stock options outstanding at December 31, 2017:

	Options Outstanding and Exercisable
	Number of Shares Underlying Options	Weighted Average Remaining Life (Years)	Weighted Average Exercise Price
$20.49 to $26.18	302,854	2.67	$	21.37
$26.19 to $31.51	360,936	5.10	30.59
$31.52 to $35.73	649,365	3.16	32.70
Total	1,313,155	3.58	$	29.51

Assumptions used to Value Performance-Vested Restricted Stock Awards

The assumptions used to value the PVRSUs include historical volatility and risk-free interest rates over a time period commensurate with the remaining term prior to vesting, as follows:

	2017		2016		2015
Valuation assumptions:
Expected volatility	56.4	%	40.7	%	34.0	%
Expected dividend yield	—	%	—	%	9.4	%
Risk-free interest rate	1.49	%	0.97	%	0.8	%

Summary of Restricted Share Awards

A summary of the RSUs awarded for each of the years ended December 31, 2017, 2016 and 2015 is as follows:

	2017		2016		2015
TVRSU
Units awarded (maximum available)	3,231,225		3,624,182		2,004,311
Weighted-average share price at award date	$	6.96	$	7.78	$	15.90
Weighted-average vesting period (years)	3.0		3.0		3.0
PVRSU
Units awarded (maximum available)	2,474,978		2,914,044		1,205,130
Weighted-average share price at award date	$	7.28	$	7.79	$	15.94
Three-year performance period ended December 31	2019		2018		2017
Weighted-average award-date fair value	$	4.37	$	3.81	$	9.12

Summary of Status of Non-Vested Restricted Shares

A summary of the status of non-vested RSUs at December 31, 2017 and changes during the year ended December 31, 2017 is presented below:

	TVRSUs Outstanding		Weighted Average Award-Date Fair Value		PVRSUs Outstanding (1)		Weighted Average Award-Date Fair Value
Non-vested RSUs at January 1, 2017	4,089,167		$	11.18	4,378,825		$	7.85
Awarded	3,231,225		6.96		2,474,978		4.37
Vested	(1,768,175	)	47.20		(367,794	)	65.56
Forfeited	(508,715	)	8.41		(840,555	)	10.67
Non-vested RSUs at December 31, 2017	5,043,502		$	7.95	5,645,454		$	4.98

(1)The number of PVRSUs shown equals the units that would vest if the “maximum” level of performance is achieved. The minimum number of units is zero and the “target” level of performance is 50 percent of the amounts shown.

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Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Changes in AOCL by Component

The following table presents the changes in the accumulated balances for each component of AOCI for the years ended December 31, 2017 and 2016. All amounts within the tables are shown net of tax.

	Unrealized Gains /(Losses) on Cash Flow Hedges (1)			Defined Benefit Pension Items (2)			Foreign Currency Items			Total
Balance at December 31, 2015	$	—		$	(46,919	)	$	(16,256	)	$	(63,175	)
Activity during period:
Other comprehensive income (loss) before reclassifications	1,187			(8,237		)	(19		)	(7,069		)
Amounts reclassified from AOCI	(1,187		)	19,291			—			18,104
Net other comprehensive income (loss)	—			11,054			(19		)	11,035
Balance at December 31, 2016	$	—		$	(35,865	)	$	(16,275	)	$	(52,140	)
Activity during period:
Other comprehensive income before reclassifications	1,239			6,630			990			8,859
Amounts reclassified from AOCI	(1,239		)	1,632			—			393
Net other comprehensive income	—			8,262			990			9,252
Balance at December 31, 2017	$	—		$	(27,603	)	$	(15,285	)	$	(42,888	)

⁽¹⁾  Unrealized gains/(losses) on cash flow hedges are related to foreign currency forward contracts. Reclassifications from AOCI are recognized through “Contract drilling services” costs on our Consolidated Statements of Operations. See “Note 12— Derivative Instruments and Hedging Activities” for additional information.

⁽²⁾  Defined benefit pension items relate to actuarial changes and the amortization of prior service costs. Reclassifications from AOCI are recognized as expense on our Consolidated Statements of Operations through either “Contract drilling services” or “General and administrative.” “See Note 11— Employee Benefit Plans ” for additional information.

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Components of Net Deferred Taxes

The components of the net deferred taxes are as follows:

	2017			2016
Deferred tax assets
United States
Excess of net tax basis over remaining book basis	$	—		$	56,351
Deferred pension plan amounts	10,758			16,797
Accrued expenses not currently deductible	11,585			19,012
Other	2,150			6,803
Non-U.S.
Net operating loss carry forwards	—			3,800
Deferred pension plan amounts	134			3,120
Accrued expense not currently deductible	14,085			2,064
Deferred tax assets	38,712			107,947
Less: valuation allowance	—			(3,800		)
Net deferred tax assets	$	38,712		$	104,147
Deferred tax liabilities
United States
Excess of net book basis over remaining tax basis	$	(182,401	)	$	—
Other	(6,652		)	(7,672		)
Non-U.S.
Excess of net book basis over remaining tax basis	—			(200		)
Other	(402		)	(4,305		)
Deferred tax liabilities	(189,455		)	(12,177		)
Net deferred tax assets (liabilities)	$	(150,743	)	$	91,970

Income (Loss) from Continuing Operations Before Income Taxes

Income (loss) from continuing operations before income taxes consists of the following:

	Year Ended December 31,
	2017			2016			2015
United States	$	(81,329	)	$	(428,087	)	$	4,031
Non-U.S.	(368,485		)	(538,942		)	738,402
Total	$	(449,814	)	$	(967,029	)	$	742,433

Income Tax Provision for Continuing Operations

The income tax provision (benefit) for continuing operations consists of the following: 

	Year Ended December 31,
	2017			2016			2015
Current- United States	$	(227,707	)	$	61,928		$	113,648
Current- Non-U.S.	29,010			18,813			81,756
Deferred- United States	257,432			(189,880		)	(38,103		)
Deferred- Non-U.S.	(16,106		)	(17		)	1,931
Total	$	42,629		$	(109,156	)	$	159,232

Reconciliation of Reserve for Uncertain Tax Positions, Excluding Interest and Penalties

The following is a reconciliation of our reserve for uncertain tax positions, excluding interest and penalties. In 2016, we released an uncertain tax position in Libya in the gross amount of $40 million coupled with a related tax benefit of $13 million.

	2017			2016			2015
Gross balance at January 1,	$	159,826		$	169,687		$	108,812
Additions based on tax positions related to current year	14,187			15,665			31,022
Additions for tax positions of prior years	1,284			18,662			47,561
Reductions for tax positions of prior years	(860		)	(43,701		)	(11,945		)
Expiration of statutes	—			(487		)	(1,237		)
Tax settlements	—			—			(4,526		)
Gross balance at December 31,	174,437			159,826			169,687
Related tax benefits	(1,008		)	(1,008		)	(14,369		)
Net reserve at December 31,	$	173,429		$	158,818		$	155,318

Summary of Liabilities Related to Reserve for Uncertain Tax Positions

The liabilities related to our reserve for uncertain tax positions are comprised of the following:

	2017		2016
Reserve for uncertain tax positions, excluding interest and penalties	$	173,429	$	158,818
Interest and penalties included in “Other liabilities”	18,431		13,702
Reserve for uncertain tax positions, including interest and penalties	$	191,860	$	172,520

Schedule of Effective Tax Rate Reconciliation

A reconciliation of tax rates outside of the United Kingdom and the Cayman Islands to our Noble-UK effective rate for continuing operations is shown below:

	Year Ended December 31,
	2017		2016		2015
Effect of:
Tax rates which are different than the UK and Cayman Island rates	23.4	%	8.4	%	14.4	%
Tax impact of asset impairment	11.7	%	3.9	%	5.3	%
Tax impact of tax restructuring	(76.1	)%	—	%	—	%
Tax impact of tax reform	33.4	%	—	%	—	%
Reserve for (resolution of) tax authority audits	(1.9	)%	(1.0	)%	1.7	%
Total	(9.5	)%	11.3	%	21.4	%

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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Reconciliation of Changes in Projected Benefit Obligations for our Non - U.S. and U.S. Plans

A reconciliation of the changes in projected benefit obligations (“PBO”) for our non-U.S. and U.S. plans is as follows:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Benefit obligation at beginning of year	$	72,347		$	216,577		$	69,372		$	228,390
Service cost	—			—			2,914			6,647
Interest cost	2,151			8,593			2,412			9,557
Actuarial loss (gain)	(11,265		)	19,113			19,296			(5,178		)
Benefits paid	(2,836		)	(6,795		)	(3,515		)	(5,747		)
Settlements and curtailments	(4,825		)	(2,313		)	(5,735		)	(17,092		)
Plan participants’ contributions	—			—			307			—
Foreign exchange rate changes	6,380			—			(12,704		)	—
Benefit obligation at end of year	$	61,952		$	235,175		$	72,347		$	216,577

Reconciliation of Changes in Fair Value of Plan Assets

A reconciliation of the changes in fair value of plan assets is as follows:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Fair value of plan assets at beginning of year	$	71,286		$	171,240		$	75,855		$	167,947
Actual return on plan assets	5,594			24,760			9,371			8,657
Employer contributions	651			2,348			2,832			383
Benefits paid	(2,836		)	(6,795		)	(3,515		)	(5,747		)
Plan participants’ contributions	—			—			307			—
Settlement and curtailment	(4,597		)	(2,313		)	—			—
Foreign exchange rate changes	7,043			—			(13,564		)	—
Fair value of plan assets at end of year	$	77,141		$	189,240		$	71,286		$	171,240

Funded Status of Plans

The funded status of the plans is as follows:

	Years Ended December 31,
	2017					2016
	Non-U.S.		U.S.			Non-U.S.			U.S.
Funded status	$	15,189	$	(45,935	)	$	(1,061	)	$	(45,337	)

Schedule of Amounts Recognized in Balance Sheet

Amounts recognized in the Consolidated Balance Sheets consist of:

	Years Ended December 31,
	2017					2016
	Non-U.S.		U.S.			Non-U.S.			U.S.
Other assets (noncurrent)	$	15,189	$	—		$	313		$	229
Other liabilities (current)	—		(2,312		)	—			(3,857		)
Other liabilities (noncurrent)	—		(43,623		)	(1,374		)	(41,709		)
Net amount recognized	$	15,189	$	(45,935	)	$	(1,061	)	$	(45,337	)

Amounts Recognized in Accumulated Other Comprehensive Loss

Amounts recognized in AOCI consist of:

	Years Ended December 31,
	2017						2016
	Non-U.S.			U.S.			Non-U.S.			U.S.
Net actuarial loss	$	2,258		$	39,569		$	17,035		$	34,200
Deferred income tax asset	(375		)	(13,849		)	(3,120		)	(12,250		)
Accumulated other comprehensive loss	$	1,883		$	25,720		$	13,915		$	21,950

Pension Costs

Pension costs include the following components:

	Years Ended December 31,
	2017						2016						2015
	Non-U.S.			U.S.			Non-U.S.			U.S.			Non-U.S.			U.S.
Service cost	$	—		$	—		$	2,914		$	6,647		$	3,344		$	8,596
Interest cost	2,151			8,593			2,412			9,557			2,546			9,198
Return on plan assets	(2,879		)	(11,764		)	(3,393		)	(12,389		)	(3,673		)	(13,146		)
Amortization of prior service cost	—			—			104			118			104			142
Recognized net actuarial loss	743			1,464			142			4,398			315			6,158
Settlement and curtailment gains	(838		)	82			600			200			—			—
Net pension benefit cost (gain)	$	(823	)	$	(1,625	)	$	2,779		$	8,531		$	2,636		$	10,948

Disaggregated Plan Information

Disaggregated information regarding our non-U.S. and U.S. plans is summarized below:

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Projected benefit obligation	$	61,952	$	235,175	$	72,347	$	216,577
Accumulated benefit obligation	61,952		235,175		72,347		216,577
Fair value of plan assets	77,141		189,240		71,286		171,240

Plans in which PBO Exceeded Fair Value

The following table provides information related to those plans in which the PBO exceeded the fair value of the plan assets at December 31, 2017 and 2016. The PBO is the actuarially computed present value of earned benefits based on service to date and includes the estimated effect of any future salary increases. Employees and alternate payees have no longer accrued future benefits under the plans since December 31, 2016.

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Projected benefit obligation	$	—	$	235,175	$	5,015	$	189,244
Fair value of plan assets	—		189,240		3,642		143,678

Plans in which Accumulated Benefit Obligation Exceeded Fair Value of Plan Assets

The following table provides information related to those plans in which the accumulated benefit obligation (“ABO”) exceeded the fair value of plan assets at December 31, 2017 and 2016. The ABO is the actuarially computed present value of earned benefits based on service to date, but differs from the PBO in that it is based on current salary levels. Employees and alternate payees will accrue no future benefits under the plans after December 31, 2016.

	Years Ended December 31,
	2017				2016
	Non-U.S.		U.S.		Non-U.S.		U.S.
Accumulated benefit obligation	$	—	$	235,175	$	5,015	$	189,244
Fair value of plan assets	—		189,240		3,642		143,678

Defined Benefit Plans Key Assumptions

The key assumptions for the plans are summarized below:

	Years Ended December 31,
	2017			2016
	Non-U.S.		U.S.	Non-U.S.		U.S.
Weighted-average assumptions used to determine benefit obligations:
Discount Rate	2.60	%	2.84%-3.66%	2.15%-2.70%		3.00%-4.24%
Rate of compensation increase	N/A		N/A	3.6	%	N/A

	Years Ended December 31,
	2017			2016			2015
	Non-U.S.		U.S.	Non-U.S.	U.S.		Non-U.S.	U.S.
Weighted-average assumptions used to determine periodic benefit cost:
Discount Rate	2.48%-2.70%		3.00%-4.24%	2.15%-3.90%	3.09%-4.48%		2.60%-3.70%	2.98%-4.38%
Expected long-term return on assets	4.10	%	6.00%-6.50%	1.60%-5.00%	7.00	%	1.60%-4.90%	7.50	%
Rate of compensation increase	N/A		N/A	3.60%-4.20%	N/A		3.60%-4.10%	2.00%-5.00%

Actual Fair Values of Defined Benefit Plans

The actual fair values of U.S. pension plan assets are as follows:

	Year Ended December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	3,275	$	3,275	$	—	$	—
Equity securities:
United States	43,535		16,430		27,105		—
International	17,712		17,712		—		—
Fixed income securities:
Corporate bonds	40,793		40,793		—		—
Treasury bonds	83,925		83,925		—		—
Total	$	189,240	$	162,135	$	27,105	$	—

	Year Ended December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	2,524	$	2,524	$	—	$	—
Equity securities:
United States	80,264		80,264		—		—
International	34,049		34,049		—		—
Fixed income securities:
Corporate bonds	54,403		54,403		—		—
Total	$	171,240	$	171,240	$	—	$	—

The actual fair values of Non-U.S. pension plans are as follows:

	Year Ended December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	280	$	280	$	—	$	—
Equity securities:
International companies	54,145		54,145		—		—
Fixed income securities:
Corporate bonds	22,716		22,716		—		—
Total	$	77,141	$	77,141	$	—	$	—

	Year Ended December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	337	$	337	$	—	$	—
Equity securities:
International companies	46,845		46,845		—		—
Fixed income securities:
Corporate bonds	20,462		20,462		—		—
Other	3,642		—		—		3,642
Total	$	71,286	$	67,644	$	—	$	3,642

Estimated Benefit Payments

The following table summarizes our estimated benefit payments at December 31, 2017:

			Payments by Period
	Total		2018		2019		2020		2021		2022		Thereafter
Estimated benefit payments
Non U.S. plans	$	36,203	$	3,079	$	3,189	$	3,301	$	3,419	$	3,540	$	19,675
U.S. plans	109,410		9,544		8,904		9,342		13,359		12,350		55,911
Total estimated benefit payments	$	145,613	$	12,623	$	12,093	$	12,643	$	16,778	$	15,890	$	75,586

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Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summarization of Financial Statement Presentation and Fair Value of Derivative Positions

The following table, together with “Note 13— Fair Value of Financial Instruments,” summarizes the financial statement presentation and fair value of our derivative positions as of December 31, 2017 and 2016:

		Estimated fair value
	Balance sheet classification	December 31, 2017		December 31, 2016
Asset derivatives
Non-designated derivatives
FCX Settlement	Prepaid expenses and other current assets	$	—	$	14,400

Summarization of Recognized Gains and Losses of Cash Flow Hedges

The following table, together with “Note 13— Fair Value of Financial Instruments,” summarizes the recognized gains and losses of cash flow hedges and non-designated derivatives through AOCI or as “Contract drilling services” revenue or costs for the years ended December 31, 2017 and 2016:

	Year Ended December 31,
	2017			2016			2017		2016		2017			2016
	Unrealized gain/(loss) recognized through AOCI						Gain/(loss) reclassified from AOCI to "Contract drilling services" costs				Gain/(loss) recognized through "Contract drilling services" revenue
Cash flow hedges
Foreign currency forward contracts	$	(1,239	)	$	(1,187	)	$	—	$	—	$	1,239		$	1,187
Non-designated derivatives
FCX Settlement	$	—		$	—		$	—	$	—	$	(14,400	)	$	14,400

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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Carrying Amount and Estimated Fair Value of Financial Instruments

The following tables present the carrying amount and estimated fair value of our financial instruments recognized at fair value on a recurring basis:

	December 31, 2017
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets -
Marketable securities	$	7,321	$	7,321	$	—	$	—

	December 31, 2016
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets -
Marketable securities	$	6,246	$	6,246	$	—	$	—
FCX Settlement	$	14,400	$	—	$	—	$	14,400

Schedule of Activity Related to FCX Settlement Asset

The following table presents the activity related to the FCX Settlement asset classified within Level 3 of the valuation hierarchy for the years ended December 31, 2017 and 2016:

Balance as of December 31, 2015	$	—
Fair value recognized in earnings	17,600
Change in fair value recognized in earnings	(3,200		)
Balance as of December 31, 2016	14,400
Change in fair value recognized in earnings	(14,400		)
Balance as of December 31, 2017	$	—

XML

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The table below depicts future minimum rental commitments under our operating leases as of December 31, 2017:

2018		2019		2020		2021		2022		Thereafter		Total
$	18,720	$	14,046	$	2,564	$	1,853	$	1,586	$	3,840	$	42,609

XML

Segment and Related Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Revenues and Identifiable Assets by Country Based on the Location of the Service Provided

The following table presents revenues and identifiable assets by country based on the location of the service provided:

	Revenues for Year Ended December 31,							Identifiable Assets as of December 31,
	2017			2016		2015		2017		2016
Africa	$	48,228		$	1,803	$	—	$	—	$	673,486
Argentina	—			51,627		111,589		—		—
Australia	12,262			89,847		204,822		257,415		—
Brazil	—			27,640		78,683		25,645		25,474
Brunei	45,450			42,710		—		119		312,494
Bulgaria	55,145			78,985		—		657,806		—
Canada	1,639			—		—		238,902		—
Curacao	—			—		—		647,554		—
Denmark	44,671			46,342		77,934		250,851		250,776
Gabon	—			23,385		90,082		8,378		—
Libya	—			—		136,406		—		—
Malaysia	131,696			168,826		149,597		293,297		747,059
Mexico	—			—		—		27,391		—
Qatar	16,488			608		—		—		263,108
Saudi Arabia	140,453			120,132		226,251		455,296		443,965
Singapore	—			—		—		911,515		230,897
Suriname	13,034			—		—		—		—
Tanzania	1,526			48,394		—		—		—
The Netherlands	—			42		67,765		—		—
Turkey	(3		)	—		97,065		—		—

United Arab Emirates	99,825		86,446		67,117		590,863		591,306
United Kingdom	209,338		95,621		87,896		894,902		1,475,651
United States	417,163		1,404,365		1,941,485		5,534,725		6,399,119
Other	—		15,292		15,560		—		26,782
Total	$	1,236,915	$	2,302,065	$	3,352,252	$	10,794,659	$	11,440,117

XML

Supplemental Financial Information (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Financial Information [Abstract]

Effect of Changes in Other Assets and Liabilities on Cash Flows from Operating Activities

The net effect of changes in other assets and liabilities on cash flows from operating activities is as follows:

	Noble-UK									Noble-Cayman
	December 31,									December 31,
	2017			2016			2015			2017			2016			2015
Accounts receivable	$	114,456		$	179,779		$	70,165		$	114,456		$	179,779		$	70,165
Other current assets	(23,710		)	81,702			61,514			(26,556		)	79,682			23,047
Other assets	(87,377		)	139,872			106,354			(89,591		)	137,792			89,877
Accounts payable	22,638			(84,873		)	(30,771		)	22,834			(83,085		)	(28,538		)
Other current liabilities	34,568			(209,739		)	(54,940		)	35,695			(205,969		)	(34,024		)
Other liabilities	(81,812		)	(19,617		)	(26,219		)	(76,929		)	(20,960		)	(25,562		)
	$	(21,237	)	$	87,124		$	126,103		$	(20,091	)	$	87,239		$	94,965

Additional Cash Flow Information

Additional cash flow information is as follows: 

	Noble - UK						Noble - Cayman
	December 31,						December 31,
	2017		2016		2015		2017		2016		2015
Cash paid during the period for:
Interest, net of amounts capitalized	$	246,960	$	232,907	$	190,917	$	246,960	$	232,907	$	190,917
Income taxes (net of refunds)	$	30,590	$	100,544	$	89,292	$	30,590	$	100,717	$	88,948
Non-cash activities during the period:
Spin-off of Paragon Offshore	N/A		N/A		N/A		N/A		N/A		N/A

XML

Condensed Consolidating Financial Information (Tables)

12 Months Ended

Dec. 31, 2017

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Guarantor Obligations

Noble-Cayman, or one or more 100 percent owned subsidiaries of Noble-Cayman, is a co-issuer or full and unconditional guarantor or otherwise obligated as of December 31, 2017 as follows:

	Issuer
Notes	(Co-Issuer(s))	Guarantor
$250 million 5.75% Senior Notes due 2018	NHIL	Noble-Cayman
$202 million 7.50% Senior Notes due 2019	NHUS	Noble-Cayman
	Noble Drilling Holding, LLC (“NDH” )
	Noble Drilling Services 6 LLC (“NDS6”)
$168 million 4.90% Senior Notes due 2020	NHIL	Noble-Cayman
$209 million 4.625% Senior Notes due 2021	NHIL	Noble-Cayman
$126 million 3.95% Senior Notes due 2022	NHIL	Noble-Cayman
$1 billion 7.75% Senior Notes due 2024	NHIL	Noble-Cayman
$450 million 7.70% Senior Notes due 2025	NHIL	Noble-Cayman
$400 million 6.20% Senior Notes due 2040	NHIL	Noble-Cayman
$400 million 6.05% Senior Notes due 2041	NHIL	Noble-Cayman
$500 million 5.25% Senior Notes due 2042	NHIL	Noble-Cayman
$400 million 8.70% Senior Notes due 2045	NHIL	Noble-Cayman

Condensed Consolidating Balance Sheet

The following consolidating financial statements of Noble-Cayman, NHUS, NDH, NHIL, NDS6 and all other subsidiaries present investments in both consolidated and unconsolidated affiliates using the equity method of accounting.

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble - Cayman		NHUS		NDH			NHIL		NDS6		Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	11	$	—	$	23,160		$	29,324	$	—	$	609,516		$	—		$	662,011
Accounts receivable	—		—		24,722			—		—		179,974			—			204,696
Taxes receivable	—		93,302		3			—		—		12,040			—			105,345
Short-term notes receivable from affiliates	—		—		119,476			—		2,373,452		—			(2,492,928		)	—
Accounts receivable from affiliates	594,456		1,454		144,367			60,945		465,749		5,813,846			(7,080,817		)	—
Prepaid expenses and other current assets	—		—		1,477			—		1		63,963			—			65,441
Total current assets	594,467		94,756		313,205			90,269		2,839,202		6,679,339			(9,573,745		)	1,037,493
Property and equipment, at cost	—		—		857,784			—		—		11,176,547			—			12,034,331
Accumulated depreciation	—		—		(110,005		)	—		—		(2,435,086		)	—			(2,545,091		)
Property and equipment, net	—		—		747,779			—		—		8,741,461			—			9,489,240
Notes receivable from affiliates	3,177,248		—		1,199,815			—		3,943,299		1,175,300			(9,495,662		)	—
Investments in affiliates	4,933,978		4,550,358		5,252,135			12,560,598		7,237,474		—			(34,534,543		)	—
Other assets	2,663		16,775		8,372			—		—		238,718			—			266,528
Total assets	$	8,708,356	$	4,661,889	$	7,521,306		$	12,650,867	$	14,019,975	$	16,834,818		$	(53,603,950	)	$	10,793,261
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables to affiliates	$	—	$	1,605,243	$	—		$	—	$	—	$	887,685		$	(2,492,928	)	$	—
Current maturities of long-term debt	—		—		—			249,843		—		—			—			249,843
Accounts payable	—		—		1,467			—		—		82,406			—			83,873
Accrued payroll and related costs	—		—		4,780			—		—		50,124			—			54,904
Accounts payable to affiliates	3,410,669		393,073		1,770,066			661,375		—		845,634			(7,080,817		)	—
Taxes payable	—		—		—			—		—		33,965			—			33,965
Interest payable	2,211		—		—			83,960		12,018		—			—			98,189
Other current liabilities	—		—		5,169			—		—		66,297			—			71,466
Total current liabilities	3,412,880		1,998,316		1,781,482			995,178		12,018		1,966,111			(9,573,745		)	592,240
Long-term debt	—		—		—			3,594,332		201,535		—			—			3,795,867
Notes payable to affiliates	—		700,000		474,637			3,175,663		—		5,145,362			(9,495,662		)	—
Deferred income taxes	—		—		5			—		—		164,957			—			164,962
Other liabilities	19,929		—		30,330			—		—		239,919			—			290,178
Total liabilities	3,432,809		2,698,316		2,286,454			7,765,173		213,553		7,516,349			(19,069,407		)	4,843,247
Commitments and contingencies
Total shareholder equity	5,275,547		1,963,573		5,234,852			4,885,694		13,806,422		8,644,002			(34,534,543		)	5,275,547
Noncontrolling interests	—		—		—			—		—		674,467			—			674,467
Total equity	5,275,547		1,963,573		5,234,852			4,885,694		13,806,422		9,318,469			(34,534,543		)	5,950,014
Total liabilities and equity	$	8,708,356	$	4,661,889	$	7,521,306		$	12,650,867	$	14,019,975	$	16,834,818		$	(53,603,950	)	$	10,793,261

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman		NHUS		NDH			NHIL		NDS6		Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	2,537	$	—	$	10,855		$	—	$	—	$	640,441		$	—		$	653,833
Accounts receivable	—		—		33,162			—		—		285,990			—			319,152
Taxes receivable	—		21,428		—			—		—		34,052			—			55,480
Short-term notes receivable from affiliates	—		—		243,915			—		1,349,708		52,611			(1,646,234		)	—
Accounts receivable from affiliates	361,313		—		137,476			67,560		85,274		3,038,658			(3,690,281		)	—
Prepaid expenses and other current assets	270		—		1,611			—		—		86,868			—			88,749
Total current assets	364,120		21,428		427,019			67,560		1,434,982		4,138,620			(5,336,515		)	1,117,214
Property and equipment, at cost	—		—		2,376,862			—		—		9,988,026			—			12,364,888
Accumulated depreciation	—		—		(428,308		)	—		—		(1,874,632		)	—			(2,302,940		)
Property and equipment, net	—		—		1,948,554			—		—		8,113,394			—			10,061,948
Notes receivable from affiliates	3,304,672		—		112,706			69,564		5,000		1,798,614			(5,290,556		)	—
Investments in affiliates	2,848,855		2,007,016		1,411,874			8,369,728		6,129,082		—			(20,766,555		)	—
Other assets	4,292		—		5,687			—		—		168,573			—			178,552
Total assets	$	6,521,939	$	2,028,444	$	3,905,840		$	8,506,852	$	7,569,064	$	14,219,201		$	(31,393,626	)	$	11,357,714
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables to affiliates	$	—	$	171,925	$	—		$	—	$	—	$	1,474,309		$	(1,646,234	)	$	—
Current maturities of long-term debt	—		—		—			299,882		—		—			—			299,882
Accounts payable	—		—		4,228			—		—		103,640			—			107,868
Accrued payroll and related costs	—		—		4,882			—		—		43,437			—			48,319
Accounts payable to affiliates	818,737		111,801		1,995,788			123,642		—		640,313			(3,690,281		)	—
Taxes payable	—		—		—			—		—		46,561			—			46,561
Interest payable	48		—		—			56,839		4,412		—			—			61,299
Other current liabilities	12		—		4,296			—		—		63,004			—			67,312
Total current liabilities	818,797		283,726		2,009,194			480,363		4,412		2,371,264			(5,336,515		)	631,241
Long-term debt	—		—		—			3,838,807		201,422		—			—			4,040,229
Notes payable to affiliates	—		700,000		467,139			744,181		—		3,379,236			(5,290,556		)	—
Deferred income taxes	—		—		534			—		—		1,550			—			2,084
Other liabilities	19,929		—		24,035			—		—		248,219			—			292,183
Total liabilities	838,726		983,726		2,500,902			5,063,351		205,834		6,000,269			(10,627,071		)	4,965,737
Commitments and contingencies
Total shareholder equity	5,683,213		1,044,718		1,404,938			3,443,501		7,363,230		7,106,323			(20,362,710		)	5,683,213
Noncontrolling interests	—		—		—			—		—		1,112,609			(403,845		)	708,764
Total equity	5,683,213		1,044,718		1,404,938			3,443,501		7,363,230		8,218,932			(20,766,555		)	6,391,977
Total liabilities and equity	$	6,521,939	$	2,028,444	$	3,905,840		$	8,506,852	$	7,569,064	$	14,219,201		$	(31,393,626	)	$	11,357,714

Condensed Consolidating Statement of Income

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	168,592		$	—		$	—		$	1,086,320		$	(47,886	)	$	1,207,026
Reimbursables and other	—			—			3,443			—			—			26,446			—			29,889
Total operating revenues	—			—			172,035			—			—			1,112,766			(47,886		)	1,236,915
Operating costs and expenses
Contract drilling services	304			12,090			43,161			3,115			—			627,251			(47,886		)	638,035
Reimbursables	—			—			1,992			—			—			16,443			—			18,435
Depreciation and amortization	—			—			58,236			—			—			484,883			—			543,119
General and administrative	129			5,761			—			1,588			9			33,600			—			41,087
Loss on impairment	—			—			45,012			—			—			76,627			—			121,639
Total operating costs and expenses	433			17,851			148,401			4,703			9			1,238,804			(47,886		)	1,362,315
Operating income (loss)	(433		)	(17,851		)	23,634			(4,703		)	(9		)	(126,038		)	—			(125,400		)
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	(476,382		)	(528,702		)	82,596			188,809			17,874			—			715,805			—
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax	2,967			4,566			—			—			—			—			(7,533		)	—
Interest expense, net of amounts capitalized	(10,951		)	(32,838		)	(13,493		)	(430,580		)	(15,288		)	(130,442		)	341,603			(291,989		)
Interest income and other, net	10,483			(141		)	87,287			4,771			224,772			19,716			(341,603		)	5,285
Income (loss) before income taxes	(474,316		)	(574,966		)	180,024			(241,703		)	227,349			(236,764		)	708,272			(412,104		)
Income tax benefit (provision)	—			241,960			(440		)	—			—			(284,115		)	—			(42,595		)
Net income (loss) from continuing operations	(474,316		)	(333,006		)	179,584			(241,703		)	227,349			(520,879		)	708,272			(454,699		)
Net income (loss) from discontinuing operations, net of tax	—			(1,598		)	—			—			—			4,565			—			2,967
Net income (loss)	(474,316		)	(334,604		)	179,584			(241,703		)	227,349			(516,314		)	708,272			(451,732		)
Net (income) loss attributable to noncontrolling interests	—			—			—			—			—			(20,589		)	(1,995		)	(22,584		)
Net income (loss) attributable to Noble Corporation	(474,316		)	(334,604		)	179,584			(241,703		)	227,349			(536,903		)	706,277			(474,316		)
Other comprehensive income (loss), net	9,252			—			—			—			—			9,252			(9,252		)	9,252
Comprehensive income (loss) attributable to Noble Corporation	$	(465,064	)	$	(334,604	)	$	179,584		$	(241,703	)	$	227,349		$	(527,651	)	$	697,025		$	(465,064	)

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	250,049		$	—		$	—		$	2,086,848		$	(94,697	)	$	2,242,200
Reimbursables and other	—			—			9,190			—			—			51,375			—			60,565
Total operating revenues	—			—			259,239			—			—			2,138,223			(94,697		)	2,302,765
Operating costs and expenses
Contract drilling services	4,532			18,902			70,801			84,309			—			789,814			(94,697		)	873,661
Reimbursables	—			—			8,231			—			—			37,268			—			45,499
Depreciation and amortization	—			—			91,802			—			—			519,211			—			611,013
General and administrative	1,264			8,716			—			40,082			1			(4,018		)	—			46,045
Loss on impairment	—			—			—			—			—			1,458,749			—			1,458,749
Total operating costs and expenses	5,796			27,618			170,834			124,391			1			2,801,024			(94,697		)	3,034,967
Operating income (loss)	(5,796		)	(27,618		)	88,405			(124,391		)	(1		)	(662,801		)	—			(732,202		)
Other income (expense)
Income (loss) of unconsolidated affiliates	(962,662		)	(257,142		)	(980,099		)	(333,446		)	515,518			—			2,017,831			—
Interest expense, net of amounts capitalized	(27,891		)	(70,494		)	(11,461		)	(228,423		)	(15,117		)	(122,345		)	252,816			(222,915		)
Gain on extinguishment of debt, net	—			—			—			17,814			—			—			—			17,814
Interest income and other, net	96,635			120			12,616			20,412			15,058			108,108			(252,816		)	133
Income (loss) before income taxes	(899,714		)	(355,134		)	(890,539		)	(648,034		)	515,458			(677,038		)	2,017,831			(937,170		)
Income tax benefit (provision)	—			(42,522		)	163			—			—			151,522			—			109,163
Net Income (loss)	(899,714		)	(397,656		)	(890,376		)	(648,034		)	515,458			(525,516		)	2,017,831			(828,007		)
Net income attributable to noncontrolling interests	—			—			—			—			—			(39,294		)	(32,413		)	(71,707		)
Net income (loss) attributable to Noble Corporation	(899,714		)	(397,656		)	(890,376		)	(648,034		)	515,458			(564,810		)	1,985,418			(899,714		)
Other comprehensive income (loss), net	11,035			—			—			—			—			11,035			(11,035		)	11,035
Comprehensive income (loss) attributable to Noble Corporation	$	(888,679	)	$	(397,656	)	$	(890,376	)	$	(648,034	)	$	515,458		$	(553,775	)	$	1,974,383		$	(888,679	)

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF INCOME and COMPREHENSIVE INCOME (LOSS)

Year Ended December 31, 2015

(Unless otherwise indicated, dollar amounts in tables are in thousands, except per share data)

	Noble- Cayman			NHUS			NDH			NHIL				NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	—		$	354,657		$	—			$	—		$	3,325,608		$	(418,655	)	$	3,261,610
Reimbursables and other	—			—			18,529			—				—			72,313			—			90,842
Total operating revenues	—			—			373,186			—				—			3,397,921			(418,655		)	3,352,452
Operating costs and expenses
Contract drilling services	3,611			19,160			395,365			84,005				—			1,142,891			(418,655		)	1,226,377
Reimbursables	—			—			13,686			—				—			56,590			—			70,276
Depreciation and amortization	—			—			77,187			—				—			556,057			—			633,244
General and administrative	1,138			8,683			—			38,167				1			7,446			—			55,435
Loss on impairment	—			—			13			—				—			418,285			—			418,298
Total operating costs and expenses	4,749			27,843			486,251			122,172			—	1			2,181,269			(418,655		)	2,403,630
Operating income (loss)	(4,749		)	(27,843		)	(113,065		)	(122,172		)		(1		)	1,216,652			—			948,822
Other income (expense)
Income (loss) of unconsolidated affiliates - continuing operations	591,297			73,319			190,335			936,429				647,856			—			(2,439,236		)	—
Interest expense, net of amounts capitalized	(75,925		)	(4,932		)	(12,110		)	(224,894		)		(25,578		)	(68,670		)	198,255			(213,854		)
Gain on extinguishment of debt, net	—			—			—			—				—			—			—			—
Interest income and other, net	24,188			4,852			52,026			71,617				5,165			75,071			(198,255		)	34,664
Income (loss) from continuing operations before income taxes	534,811			45,396			117,186			660,980				627,442			1,223,053			(2,439,236		)	769,632
Income tax provision	—			(77,929		)	(4,466		)	—				—			(80,225		)	—			(162,620		)
Net income (loss)	534,811			(32,533		)	112,720			660,980				627,442			1,142,828			(2,439,236		)	607,012
Net (income) loss attributable to noncontrolling interests	—			—			—			—				—			(105,240		)	33,039			(72,201		)
Net income (loss) attributable to Noble Corporation	534,811			(32,533		)	112,720			660,980				627,442			1,037,588			(2,406,197		)	534,811
Other comprehensive income (loss), net	6,243			—			—			—				—			6,243			(6,243		)	6,243
Comprehensive income (loss) attributable to Noble Corporation	$	541,054		$	(32,533	)	$	112,720		$	660,980			$	627,442		$	1,043,831		$	(2,412,440	)	$	541,054

Condensed Consolidating Statement of Cash Flows

CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2017

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments		Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	32,195		$	100,883		$	209,898		$	(403,391	)	$	217,080		$	335,672		$	—	$	492,337
Cash flows from investing activities
Capital expenditures	—			—			(3,622		)	—			—			(154,348		)	—		(157,970		)
Proceeds from disposal of assets	—			—			46			—			—			2,336			—		2,382
Net cash used in investing activities	—			—			(3,576		)	—			—			(152,012		)	—		(155,588		)
Cash flows from financing activities
Repayment of long-term debt	—			—			—			(300,000		)	—			—			—		(300,000		)
Debt issuance costs on senior notes and credit facility	—			—			—			(42		)	—			—			—		(42		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(56,881		)	—		(56,881		)
Contributions from parent company, net	28,352			—			—			—			—			—			—		28,352
Advances (to) from affiliates	(63,073		)	(100,883		)	(194,017		)	732,757			(217,080		)	(157,704		)	—		—
Net cash provided by (used in) financing activities	(34,721		)	(100,883		)	(194,017		)	432,715			(217,080		)	(214,585		)	—		(328,571		)
Net change in cash and cash equivalents	(2,526		)	—			12,305			29,324			—			(30,925		)	—		8,178
Cash and cash equivalents, beginning of period	2,537			—			10,855			—			—			640,441			—		653,833
Cash and cash equivalents, end of period	$	11		$	—		$	23,160		$	29,324		$	—		$	609,516		$	—	$	662,011

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2016

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments		Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	97,388		$	(150,735	)	$	149,431		$	(344,112	)	$	(60	)	$	1,404,359		$	—	$	1,156,271
Cash flows from investing activities
Capital expenditures	—			—			(492,985		)	—			—			(201,754		)	—		(694,739		)
Proceeds from disposal of assets	—			—			—			—			—			24,808			—		24,808
Net cash used in investing activities	—			—			(492,985		)	—			—			(176,946		)	—		(669,931		)
Cash flows from financing activities
Repayment of long-term debt	—			—			—			(1,049,338		)	—			—			—		(1,049,338		)
Issuance of senior notes	—			—			—			980,100			—			—			—		980,100
Tender offer premium	—			—			—			(24,649		)	—			—			—		(24,649		)
Debt issuance costs on senior notes and credit facilities	—			—			—			(12,111		)	—			—			—		(12,111		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(85,944		)	—		(85,944		)
Distributions to parent company, net	(152,360		)	—			—			—			—			—			—		(152,360		)
Advances (to) from affiliates	55,882			150,735			352,308			450,110			60			(1,009,095		)	—		—
Net cash provided by (used in) financing activities	(96,478		)	150,735			352,308			344,112			60			(1,095,039		)	—		(344,302		)
Net change in cash and cash equivalents	910			—			8,754			—			—			132,374			—		142,038
Cash and cash equivalents, beginning of period	1,627			—			2,101			—			—			508,067			—		511,795
Cash and cash equivalents, end of period	$	2,537		$	—		$	10,855		$	—		$	—		$	640,441		$	—	$	653,833

NOBLE CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Year Ended December 31, 2015

(Unless otherwise indicated, dollar amounts in tables are in thousands)

	Noble- Cayman			NHUS			NDH			NHIL			NDS6			Other Non-guarantor Subsidiaries of Noble			Consolidating Adjustments			Total
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	(31,562	)	$	(53,686	)	$	15,207		$	(267,735	)	$	(20,292	)	$	2,105,575		$	—		$	1,747,507
Cash flows from investing activities
Capital expenditures	—			—			(116,594		)	—			—			(320,557		)	—			(437,151		)
Proceeds from disposal of assets	—			—			—			—			—			4,614			—			4,614
Notes receivable from affiliates	124,951			—			—			608,771			—			—			(733,722		)	—
Net cash provided by (used in) investing activities	124,951			—			(116,594		)	608,771			—			(315,943		)	(733,722		)	(432,537		)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	(1,123,495		)	—			—			—			—			—			—			(1,123,495		)
Repayment of long-term debt	—			—			—			(350,000		)	—			—			—			(350,000		)
Issuance of senior notes	—			—			—			1,092,728			—			—			—			1,092,728
Debt issuance costs on senior notes and credit facilities	(6,450		)	—			—			(9,620		)	—			—			—			(16,070		)
Dividends paid to noncontrolling interests	—			—			—			—			—			(71,504		)	—			(71,504		)
Distributions to parent company, net	(400,614		)	—			—			—			—			—			—			(400,614		)
Notes payable to affiliates	(608,771		)	—			—			—			—			(124,951		)	733,722			—
Advances (to) from affiliates	2,047,563			53,686			103,234			(1,074,144		)	20,292			(1,150,631		)	—			—
Net cash provided by (used in) financing activities	(91,767		)	53,686			103,234			(341,036		)	20,292			(1,347,086		)	733,722			(868,955		)
Net change in cash and cash equivalents	1,622			—			1,847			—			—			442,546			—			446,015
Cash and cash equivalents, beginning of period	5			—			254			—			—			65,521			—			65,780
Cash and cash equivalents, end of period	$	1,627		$	—		$	2,101		$	—		$	—		$	508,067		$	—		$	511,795

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Unaudited Interim Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Unaudited Interim Financial Information

Unaudited interim consolidated financial information from continuing operations for Noble-UK is as follows:

	Quarters Ended
	March 31			June 30			September 30			December 31
2017
Operating revenues	$	362,976		$	278,142		$	266,212		$	329,585
Operating income (loss)	45,847			(43,875		)	(55,588		)	(109,656		)
Net loss from continuing operations	(301,694		)	(91,864		)	(96,792		)	(24,675		)
Net loss from discontinued operations, net of tax	—			(1,486		)	—			—
Net loss per share from continuing operations attributable to Noble-UK (1)
Basic
Net loss from continuing operations	(1.24		)	(0.37		)	(0.40		)	(0.10		)
Net loss from discontinued operations, net of tax	—			(0.01		)	—			—
Diluted
Net loss from continuing operations	(1.24		)	(0.37		)	(0.40		)	(0.10		)
Net loss from discontinued operations, net of tax	—			(0.01		)	—			—

	Quarter Ended
	March 31		June 30		September 30			December 31
2016
Operating revenues	$	611,973	$	894,783	$	385,153		$	410,156
Operating income (loss)	175,460		449,714		(2,208		)	(1,384,912		)
Net income (loss) from continuing operations attributable to Noble-UK	105,485		322,866		(55,081		)	(1,302,850		)
Net income (loss) per share from continuing operations attributable to Noble-UK (1)
Basic
Net income (loss) from continuing operations	0.42		1.28		(0.23		)	(5.36		)
Diluted
Net income (loss) from continuing operations	0.42		1.28		(0.23		)	(5.36		)

⁽¹⁾  Net income (loss) per share is computed independently for each of the quarters presented. Therefore, the sum of the quarters’ net income (loss) per share may not equal the total computed for the year.

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Organization and Significant Accounting Policies (Detail) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2017 USD ($) Vessel Rig	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) Segment Vessel Rig JointVenture	Dec. 31, 2016 USD ($) Rig	Dec. 31, 2015 USD ($) Rig	Apr. 30, 2015 Rig	Dec. 31, 2014 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of drillships | Vessel	8					8
Number of semisubmersibles | Vessel	6					6
Number of jackups | Vessel	14					14
Number of reportable segments | Segment						1
Number of joint ventures | JointVenture						2
Percent of interest in joint ventures						50.00%
Cash and cash equivalents	$ 662,829					$ 662,829	$ 725,722	$ 512,245		$ 68,510
Allowance for doubtful accounts on receivables	20,800					20,800	20,800
Capital accruals						$ 21,000	25,800
Period for incurring maintenance costs, minimum						3 years
Period for incurring maintenance costs, maximum						5 years
Deferred revenues under drilling contracts	114,300					$ 114,300	134,400
Deferred expenses under drilling contracts	55,700					55,700	72,800
Tax Cuts and Jobs Act of 2017, tax benefit						109,000
Loss reserves for personal injury and protection claims	22,000					22,000	22,100
Net loss from discontinued operations, net of tax	0	$ 0	$ (1,486)	$ 0		(1,486)	0	0
Net cash provided by (used in) operating activities						453,938	1,126,076	1,764,907
Other assets	266,444					266,444	185,555
Retained earnings	4,637,677					4,637,677	5,154,221
Accounting Standards Update 2016-09, Excess Tax Benefit Component
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities							5,500	1,600
Accounting Standards Update 2016-09, Statutory Tax Withholding Component
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities							$ (3,200)	$ (4,100)
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets	(148,000)					(148,000)
Retained earnings	$ (148,000)					$ (148,000)
Drilling Equipment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maximum useful life of property plant and equipment						3 years
Drilling Equipment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maximum useful life of property plant and equipment						30 years
Other | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maximum useful life of property plant and equipment						2 years
Other | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maximum useful life of property plant and equipment						40 years
Aramco
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of rigs | Rig	5					5		5	5
Number of rigs with revenues in excess of billings | Rig	2					2	2
Revenues recorded in excess of billings	$ 6,900					$ 6,900	$ 17,900
Prepaid Expenses And Other Current Assets Or Other Assets | Aramco
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues recorded in excess of billings	6,900					6,900	17,900
Bully Joint Venture
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Carrying amount of the drillships	1,300,000					1,300,000	1,400,000
Cash and cash equivalents	$ 41,600					$ 41,600	$ 34,700
Accumulated Other Comprehensive Income (Loss) | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax Cuts and Jobs Act of 2017, reclassification					$ (5,500)
Retained Earnings | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax Cuts and Jobs Act of 2017, reclassification					$ 5,500

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Consolidated Joint Ventures (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Rig JointVenture	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule Of Equity Method Investments [Line Items]
Percent of interest in joint ventures	50.00%
Number of joint ventures | JointVenture	2
Number of bully class drillships | Rig	2
Percentage of dividends paid to joint venture partner	50.00%
Cash and cash equivalents	$ 662,829	$ 725,722	$ 512,245	$ 68,510
Bully Joint Venture
Schedule Of Equity Method Investments [Line Items]
Dividends approved and paid	113,800	171,900	$ 143,000
Carrying amount of the drillships	1,300,000	1,400,000
Cash and cash equivalents	$ 41,600	$ 34,700

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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Noble-UK (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic
Net income (loss) attributable to the company	$ (24,675)	$ (96,792)	$ (91,864)	$ (301,694)	$ (1,302,850)	$ (55,081)	$ 322,866	$ 105,485		$ (516,511)	$ (929,580)	$ 511,000
Net income (loss) from discontinued operations, net of tax	0	0	1,486	0						1,486	0	0
Earnings allocated to unvested share-based payment awards										0	0	(10,856)
Net income (loss) from continuing operations to common shareholders - basic										(515,025)	(929,580)	500,144
Diluted
Net income (loss) attributable to the company	(24,675)	(96,792)	(91,864)	(301,694)	$ (1,302,850)	$ (55,081)	$ 322,866	$ 105,485		(516,511)	(929,580)	511,000
Net loss from discontinued operations, net of tax	$ 0	$ 0	$ 1,486	$ 0						1,486	0	0
Net income (loss) from continuing operations to common shareholders - diluted										$ (515,025)	$ (929,580)	$ 511,000
Denominator:
Weighted average shares outstanding - basic (in shares)										244,743	243,127	242,146
Incremental shares issuable from assumed exercise of stock options and unvested share-based payment awards										0	0	5,256
Weighted average shares outstanding - diluted (in shares)		244,743				243,127			247,402	244,743	243,127	247,402
Basic:
Income (loss) from continuing operations (usd per share)	$ (0.10)	$ (0.40)	$ (0.37)	$ (1.24)	$ (5.36)	$ (0.23)	$ 1.28	$ 0.42		$ (2.10)	$ (3.82)	$ 2.06
Loss from discontinued operations (usd per share)	0.00	0.00	(0.01)	0.00						(0.01)	0.00	0.00
Net income (loss) (usd per share)										(2.11)	(3.82)	2.06
Diluted:
Income (loss) from continuing operations (usd per share)	(0.10)	(0.40)	(0.37)	(1.24)	$ (5.36)	$ (0.23)	$ 1.28	$ 0.42		(2.10)	(3.82)	2.06
Loss from discontinued operations (usd per share)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00						(0.01)	0.00	0.00
Net income (loss) (usd per share)										(2.11)	(3.82)	2.06
Dividends per share (usd per share)										$ 0	$ 0.2	$ 1.28

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Earnings Per Share - Additional Information (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the diluted net income per share	12.0	9.9	1.7

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Receivables from Customers (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Receivables disputed by customer and written off	$ 29,032	$ 0	$ 0
Petroleos Mexicanos | Contract drilling services | Uncollectible receivables
Accounts Notes And Loans Receivable [Line Items]
Receivables disputed by customer and written off	$ 14,400
Petroleos Mexicanos | Other assets
Accounts Notes And Loans Receivable [Line Items]
Approximate receivable		$ 14,400

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Property and Equipment (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, at cost		$ 12,034,331,000	$ 12,364,888,000
Capital expenditures		111,140,000	659,925,000	$ 422,544,000
Capitalized interest on construction-in-progress		0	22,400,000	25,000,000
Contract drilling services costs		640,489,000	879,438,000	1,232,529,000
Loss on impairment		121,639,000	1,458,749,000	$ 418,298,000
Hurricane
Property, Plant and Equipment [Line Items]
Contract drilling services costs		14,300,000
Drilling equipment and facilities
Property, Plant and Equipment [Line Items]
Property and equipment, at cost		11,746,629,000	12,048,571,000
Drilling equipment and facilities | Noble Lloyd Noble
Property, Plant and Equipment [Line Items]
Term of contract	4 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, at cost		83,509,000	112,103,000
Other
Property, Plant and Equipment [Line Items]
Property and equipment, at cost		$ 204,193,000	$ 204,214,000

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Impairment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Rig	Sep. 30, 2015 Rig
Loss Contingencies [Line Items]
Loss on impairment	$ 121,639	$ 1,458,749	$ 418,298
Proceeds from disposal of assets	$ 2,382	24,808	4,614
Noble Amos Runner, Noble Clyde Boudreaux And Noble Dave Beard
Loss Contingencies [Line Items]
Impairment related charges		1,000,000
Noble Homer Ferrington
Loss Contingencies [Line Items]
Impairment related charges		120,100
Capital Spare Equipment
Loss Contingencies [Line Items]
Impairment related charges		170,500	$ 406,000
Noble Max Smith
Loss Contingencies [Line Items]
Impairment related charges		164,800
Proceeds from disposal of assets		$ 1,200
Noble Discoverer
Loss Contingencies [Line Items]
Number of drillships discontinued | Rig			1
Noble Charles Copeland
Loss Contingencies [Line Items]
Number of jackups discontinued | Rig				1

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Debt - Additional Information (Detail)	1 Months Ended				12 Months Ended
	Mar. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Dec. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Apr. 30, 2018	Feb. 01, 2018 USD ($)	Jan. 31, 2018 USD ($)	Jan. 03, 2018 USD ($)	Dec. 28, 2016 USD ($)	Apr. 01, 2016 USD ($)
Debt Instrument [Line Items]
Long-term debt, principal amount					$ 4,103,797,000
Gain on extinguishment of debt, net					0	$ 17,814,000	$ 0
NHIL
Debt Instrument [Line Items]
Gain on extinguishment of debt, net						17,814,000	$ 0
7.70% Senior Notes due April 2025
Debt Instrument [Line Items]
Face value of senior notes					$ 450,000,000
Interest rate on senior notes					7.70%
8.70% Senior Notes due April 2045
Debt Instrument [Line Items]
Face value of senior notes					$ 400,000,000
Interest rate on senior notes					8.70%
4.90% Senior Notes and 4.625% Senior Notes due in August 2020 and March 2021
Debt Instrument [Line Items]
Face value of senior notes													$ 36,000,000
Purchase of senior notes													$ 24,000,000
Gain on extinguishment of debt, net				$ 11,100,000
5.75% Senior Notes due March 2018
Debt Instrument [Line Items]
Face value of senior notes					$ 250,000,000
Interest rate on senior notes					5.75%
Line of Credit | 2015 Credit Facility
Debt Instrument [Line Items]
Senior unsecured revolving credit facility maturity period					5 years
Maximum borrowing capacity under credit facilities					$ 2,400,000,000
Outstanding borrowings					$ 0
Line of Credit | 2017 Credit Facility
Debt Instrument [Line Items]
Senior unsecured revolving credit facility maturity period					5 years
Outstanding borrowings					$ 0
Line of Credit | 2017 Credit Facility | Subsequent event
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facilities											$ 1,501,500,000
Line of Credit | Revolving Credit Facility | 2015 Credit Facility
Debt Instrument [Line Items]
Maximum debt to tangible capitalization covenant					60.00%
Line of credit facility debt to tangible capitalization ratio					43.00%
Line of Credit | Revolving Credit Facility | 2015 Credit Facility | Subsequent event
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facilities											300,000,000
Line of Credit | Revolving Credit Facility | 2017 Credit Facility
Debt Instrument [Line Items]
Maximum debt to tangible capitalization covenant					55.00%
Debt covenant, rig value of marketed rigs to indebtedness, required minimum ratio					3.00
Debt covenants, rig value of closing date rigs, required minimum ratio					0.8
Debt restrictive covenants, maximum available cash after borrowings					$ 200,000,000
Line of Credit | Revolving Credit Facility | 2017 Credit Facility | Subsequent event
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facilities											1,501,500,000
Amount credit facility can be increased											500,000,000
Line of Credit | Letter of Credit | 2015 Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facilities					$ 500,000,000
Line of Credit | Letter of Credit | 2015 Credit Facility | Subsequent event
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facilities											0
Line of Credit | Letter of Credit | 2017 Credit Facility | Subsequent event
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facilities											$ 15,000,000
Senior notes | Subsequent event
Debt Instrument [Line Items]
Purchase of senior notes									$ 754,200,000
Repurchase amount									$ 750,000,000
Gain on extinguishment of debt, net		$ (2,000,000)
Senior notes | Senior unsecured note
Debt Instrument [Line Items]
Long-term debt, principal amount			$ 1,000,000,000			1,000,000,000
Senior notes | Senior unsecured note | NHIL
Debt Instrument [Line Items]
Face value of senior notes			1,000,000,000.0			$ 1,000,000,000.0
Approximate net proceeds from senior notes issuance			$ 967,600,000
Senior notes | Senior Notes due 2026 | Subsequent event | NHIL
Debt Instrument [Line Items]
Face value of senior notes										$ 750,000,000.0
Senior notes | 7.70% Senior Notes due April 2025
Debt Instrument [Line Items]
Interest rate on senior notes					7.70%
Senior notes | 7.70% Senior Notes due April 2025 | Forecast | Standard And Poor Global Ratings
Debt Instrument [Line Items]
Interest rate on senior notes								7.95%
Senior notes | 8.70% Senior Notes due April 2045
Debt Instrument [Line Items]
Interest rate on senior notes					8.70%
Senior notes | 8.70% Senior Notes due April 2045 | Forecast | Standard And Poor Global Ratings
Debt Instrument [Line Items]
Interest rate on senior notes								8.95%
Senior notes | 2.50% Senior Notes due March 2017
Debt Instrument [Line Items]
Interest rate on senior notes			2.50%			2.50%
Senior notes | 5.75% Senior Notes due March 2018
Debt Instrument [Line Items]
Interest rate on senior notes					5.75%
Senior notes | 5.75% Senior Notes due March 2018 | Forecast
Debt Instrument [Line Items]
Outstanding balance to be repaid	$ 300,000,000
Senior notes | Multiple senior notes
Debt Instrument [Line Items]
Purchase of senior notes												$ 762,300,000.0
Repurchase amount												$ 750,000,000
Gain on extinguishment of debt, net						$ 6,700,000

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Debt - Aggregate Principal Repayments (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2018	$ 250,000
2019	201,695
2020	167,766
2021	208,675
2022	125,661
Thereafter	3,150,000
Long-term debt, principal amount	$ 4,103,797

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Debt - Estimated Fair Value of Our Long-Term Debt, not Including Effect of Unamortized Debt Issuance Costs (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Less: Current maturities of long-term debt	$ (249,843)	$ (299,882)
Unamortized debt issuance expense, current	$ 100	100
5.75% Senior Notes due March 2018
Debt Instrument [Line Items]
Interest rate on senior notes	5.75%
7.50% Senior Notes due March 2019
Debt Instrument [Line Items]
Interest rate on senior notes	7.50%
4.90% Senior Notes due August 2020
Debt Instrument [Line Items]
Interest rate on senior notes	4.90%
4.625% Senior Notes due March 2021
Debt Instrument [Line Items]
Interest rate on senior notes	4.625%
3.95% Senior Notes due March 2022
Debt Instrument [Line Items]
Interest rate on senior notes	3.95%
7.75% Senior Notes due January 2024
Debt Instrument [Line Items]
Interest rate on senior notes	7.75%
7.70% Senior Notes due April 2025
Debt Instrument [Line Items]
Interest rate on senior notes	7.70%
6.20% Senior Notes due August 2040
Debt Instrument [Line Items]
Interest rate on senior notes	6.20%
6.05% Senior Notes due March 2041
Debt Instrument [Line Items]
Interest rate on senior notes	6.05%
5.25% Senior Notes due March 2042
Debt Instrument [Line Items]
Interest rate on senior notes	5.25%
8.70% Senior Notes due April 2045
Debt Instrument [Line Items]
Interest rate on senior notes	8.70%
Senior notes | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 4,075,433	4,372,724
Less: Unamortized debt issuance costs	(29,723)	(32,613)
Less: Current maturities of long-term debt	(249,843)	(299,882)
Long-term debt, net of debt issuance costs	3,795,867	4,040,229
Senior notes | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	3,350,723	3,812,077
Less: Current maturities of long-term debt	(250,830)	(299,128)
Long-term debt, net of debt issuance costs	3,099,893	$ 3,512,949
Senior notes | 2.50% Senior Notes due March 2017
Debt Instrument [Line Items]
Interest rate on senior notes		2.50%
Senior notes | 2.50% Senior Notes due March 2017 | Carrying Value
Debt Instrument [Line Items]
Total debt	0	$ 299,992
Senior notes | 2.50% Senior Notes due March 2017 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 0	299,128
Senior notes | 5.75% Senior Notes due March 2018
Debt Instrument [Line Items]
Interest rate on senior notes	5.75%
Senior notes | 5.75% Senior Notes due March 2018 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 249,959	249,771
Senior notes | 5.75% Senior Notes due March 2018 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 250,830	249,808
Senior notes | 7.50% Senior Notes due March 2019
Debt Instrument [Line Items]
Interest rate on senior notes	7.50%
Senior notes | 7.50% Senior Notes due March 2019 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 201,695	201,695
Senior notes | 7.50% Senior Notes due March 2019 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 206,881	209,524
Senior notes | 4.90% Senior Notes due August 2020
Debt Instrument [Line Items]
Interest rate on senior notes	4.90%
Senior notes | 4.90% Senior Notes due August 2020 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 167,625	167,576
Senior notes | 4.90% Senior Notes due August 2020 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 163,283	167,329
Senior notes | 4.625% Senior Notes due March 2021
Debt Instrument [Line Items]
Interest rate on senior notes	4.625%
Senior notes | 4.625% Senior Notes due March 2021 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 208,568	208,538
Senior notes | 4.625% Senior Notes due March 2021 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 195,687	196,416
Senior notes | 3.95% Senior Notes due March 2022
Debt Instrument [Line Items]
Interest rate on senior notes	3.95%
Senior notes | 3.95% Senior Notes due March 2022 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 125,518	125,488
Senior notes | 3.95% Senior Notes due March 2022 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 107,348	112,791
Senior notes | 7.75% Senior Notes due January 2024
Debt Instrument [Line Items]
Interest rate on senior notes	7.75%
Senior notes | 7.75% Senior Notes due January 2024 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 982,301	980,117
Senior notes | 7.75% Senior Notes due January 2024 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 861,160	945,317
Senior notes | 7.70% Senior Notes due April 2025
Debt Instrument [Line Items]
Interest rate on senior notes	7.70%
Senior notes | 7.70% Senior Notes due April 2025 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 449,008	448,909
Senior notes | 7.70% Senior Notes due April 2025 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 380,732	423,267
Senior notes | 6.20% Senior Notes due August 2040
Debt Instrument [Line Items]
Interest rate on senior notes	6.20%
Senior notes | 6.20% Senior Notes due August 2040 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 399,900	399,898
Senior notes | 6.20% Senior Notes due August 2040 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 274,988	280,221
Senior notes | 6.05% Senior Notes due March 2041
Debt Instrument [Line Items]
Interest rate on senior notes	6.05%
Senior notes | 6.05% Senior Notes due March 2041 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 397,800	397,758
Senior notes | 6.05% Senior Notes due March 2041 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 273,988	273,854
Senior notes | 5.25% Senior Notes due March 2042
Debt Instrument [Line Items]
Interest rate on senior notes	5.25%
Senior notes | 5.25% Senior Notes due March 2042 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 498,400	498,369
Senior notes | 5.25% Senior Notes due March 2042 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 315,430	325,814
Senior notes | 8.70% Senior Notes due April 2045
Debt Instrument [Line Items]
Interest rate on senior notes	8.70%
Senior notes | 8.70% Senior Notes due April 2045 | Carrying Value
Debt Instrument [Line Items]
Total debt	$ 394,659	394,613
Senior notes | 8.70% Senior Notes due April 2045 | Estimated Fair Value
Debt Instrument [Line Items]
Total debt	$ 320,396	$ 328,608

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Equity - Narrative (Detail) - USD ($)	1 Months Ended		12 Months Ended
	Feb. 28, 2018	Dec. 31, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding and trading			244,971,000	243,239,000
Additional conditionally authorized shares without additional shareholder approval			53,000,000
Current nominal value per share			$ 0.01
Number of shares authorized to be repurchased		37,000,000
Shares outstanding repurchased percentage		15.00%
Repurchases of shares, Shares			0	0	6,200,000
Repurchases of shares					$ 100,630,000
Repurchases of shares, average price per share (usd per share)					$ 16.10
Stock options granted			0	0	0
Compensation cost recognized				$ 0
2015 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized under plan			3,700,000.0	9,500,000.0
Total number of shares issuable under stock option plan			20,500,000
Remaining number of shares available for grants			10,400,000
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option exercisable term			10 years
Compensation cost recognized			$ 0		$ 100,000
Weighted-average vesting period (years)			3 years
TVRSU's Outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental fair value awarded as a result of the issuance of awards			$ 23,800,000
Weighted-average vesting period (years)			3 years
Total unrecognized compensation cost			$ 21,500,000
Period for recognizing unrecognized compensation cost			1 year 7 months 12 days
Performance shares forfeited in period			508,715
PVRSU's Outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average vesting period (years)			3 years
Period for recognizing unrecognized compensation cost			1 year 6 months 12 days
Total unrecognized compensation cost			$ 9,800,000
Performance shares forfeited in period			840,555
Performance Vested Shares for 2012-2014 Performance Period | Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares forfeited in period	603,440
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized			$ 29,100,000	$ 34,700,000	39,000,000
Compensation cost recognized net of tax			$ 26,300,000	31,000,000	31,000,000
Capitalized compensation costs				$ 200,000	$ 1,000,000
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrestricted shares awarded			212,849	227,937	99,063
Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrestricted shares awarded			197,316

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Equity - Summary of Stock Options Granted (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of year, Number of Shares Underlying Options (in shares)	1,420,175	1,677,154	1,958,633
Expired, Number of Shares Underlying Options (in shares)	(107,020)	(256,979)	(281,479)
Outstanding at end of year, Number of Shares Underlying Options (in shares)	1,313,155	1,420,175	1,677,154
Exercisable at end of year, Number of Shares Underlying Options (in shares)	1,313,155	1,420,175	1,677,154
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of year, Weighted Average Exercise Price (usd per share)	$ 29.52	$ 29.48	$ 28.43
Expired, Weighted Average Exercise Price (usd per share)	29.74	29.22	22.17
Outstanding at end of year, Weighted Average Exercise Price (usd per share)	29.51	29.52	29.48
Exercisable at end of year, Weighted Average Exercise Price (usd per share)	$ 29.51	$ 29.52	$ 29.48
Aggregate intrinsic value of options outstanding and exercisable	$ 0

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Equity - Additional Information About Stock Options Outstanding (Detail)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable, Number of Shares Underlying Options (in shares) | shares	1,313,155
Options Outstanding and Exercisable, Weighted Average Remaining Life (Years)	3 years 3 months 119 days
Options Outstanding and Exercisable, Weighted Average Exercise Price (usd per share)	$ 29.51
$20.49 to $26.18
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	20.49
Exercise price range, upper range limit	$ 26.18
Options Outstanding and Exercisable, Number of Shares Underlying Options (in shares) | shares	302,854
Options Outstanding and Exercisable, Weighted Average Remaining Life (Years)	2 years 8 months 1 day
Options Outstanding and Exercisable, Weighted Average Exercise Price (usd per share)	$ 21.37
$26.19 to $31.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	26.19
Exercise price range, upper range limit	$ 31.51
Options Outstanding and Exercisable, Number of Shares Underlying Options (in shares) | shares	360,936
Options Outstanding and Exercisable, Weighted Average Remaining Life (Years)	5 years 1 month 6 days
Options Outstanding and Exercisable, Weighted Average Exercise Price (usd per share)	$ 30.59
$31.52 to $35.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	31.52
Exercise price range, upper range limit	$ 35.73
Options Outstanding and Exercisable, Number of Shares Underlying Options (in shares) | shares	649,365
Options Outstanding and Exercisable, Weighted Average Remaining Life (Years)	3 years 1 month 28 days
Options Outstanding and Exercisable, Weighted Average Exercise Price (usd per share)	$ 32.70

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Equity - Assumptions used to Value the Performance-Vested Restricted Stock Awards (Detail) - Restricted Stock Awards [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation assumptions:
Expected volatility	56.40%	40.70%	34.00%
Expected dividend yield	0.00%	0.00%	9.40%
Risk-free interest rate	1.49%	0.97%	0.80%

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Equity - Summary of Restricted Share Awards (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
TVRSU
PVRSU
Units awarded (maximum available) (in shares)	3,231,225	3,624,182	2,004,311
Weighted-average share price at award date (usd per share)	$ 6.96	$ 7.78	$ 15.90
Weighted-average vesting period (years)	3 years	3 years	3 years
PVRSU
PVRSU
Units awarded (maximum available) (in shares)	2,474,978	2,914,044	1,205,130
Weighted-average share price at award date (usd per share)	$ 7.28	$ 7.79	$ 15.94
Three-year performance period ended December 31	2019	2018	2017
Awarded, Weighted-average award-date fair value (usd per share)	$ 4.37	$ 3.81	$ 9.12

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Equity - Summary of Status of Non-Vested Restricted Shares (Detail)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
TVRSU's Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, Beginning balance (in shares)	4,089,167
Awarded (in shares)	3,231,225
Vested (in shares)	(1,768,175)
Forfeited (in shares)	(508,715)
Outstanding, Ending balance (in shares)	5,043,502
Weighted Average Award-Date Fair Value
Weighted Average Award-Date Fair Value, Beginning balance (usd per share) | $ / shares	$ 11.18
Awarded, Weighted-average award-date fair value (usd per share) | $ / shares	6.96
Vested, Weighted Average Award-Date Fair Value (usd per share) | $ / shares	47.20
Forfeited, Weighted Average Award-Date Fair Value (usd per share) | $ / shares	8.41
Weighted Average Award-Date Fair Value, Ending balance (usd per share) | $ / shares	$ 7.95
PVRSU's Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, Beginning balance (in shares)	4,378,825
Awarded (in shares)	2,474,978
Vested (in shares)	(367,794)
Forfeited (in shares)	(840,555)
Outstanding, Ending balance (in shares)	5,645,454
Weighted Average Award-Date Fair Value
Weighted Average Award-Date Fair Value, Beginning balance (usd per share) | $ / shares	$ 7.85
Awarded, Weighted-average award-date fair value (usd per share) | $ / shares	4.37
Vested, Weighted Average Award-Date Fair Value (usd per share) | $ / shares	65.56
Forfeited, Weighted Average Award-Date Fair Value (usd per share) | $ / shares	10.67
Weighted Average Award-Date Fair Value, Ending balance (usd per share) | $ / shares	$ 4.98
Minimum number of performance vested shares	0
Target level of performance, percent	50.00%

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Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 6,467,445	$ 7,422,230	$ 7,287,034
Other comprehensive income (loss) before reclassifications	8,859	(7,069)
Amounts reclassified from AOCI	393	18,104
Other comprehensive income, net	9,252	11,035	6,243
Ending Balance	5,950,628	6,467,445	7,422,230
Unrealized Gains /(Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0	0
Other comprehensive income (loss) before reclassifications	1,239	1,187
Amounts reclassified from AOCI	(1,239)	(1,187)
Other comprehensive income, net	0	0
Ending Balance	0	0	0
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(35,865)	(46,919)
Other comprehensive income (loss) before reclassifications	6,630	(8,237)
Amounts reclassified from AOCI	1,632	19,291
Other comprehensive income, net	8,262	11,054
Ending Balance	(27,603)	(35,865)	(46,919)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(16,275)	(16,256)
Other comprehensive income (loss) before reclassifications	990	(19)
Amounts reclassified from AOCI	0	0
Other comprehensive income, net	990	(19)
Ending Balance	(15,285)	(16,275)	(16,256)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(52,140)	(63,175)	(69,418)
Other comprehensive income, net	9,252	11,035	6,243
Ending Balance	$ (42,888)	$ (52,140)	$ (63,175)

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Income Taxes - Components of Net Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Deferred tax assets	$ 38,712	$ 107,947
Less: valuation allowance	0	(3,800)
Net deferred tax assets	38,712	104,147
Deferred tax liabilities
Deferred tax liabilities	(189,455)	(12,177)
Net deferred tax assets (liabilities)	(150,743)
Net deferred tax assets (liabilities)		91,970
United States
Deferred tax assets
Excess of net tax basis over remaining book basis	0	56,351
Deferred pension plan amounts	10,758	16,797
Accrued expenses not currently deductible	11,585	19,012
Other	2,150	6,803
Deferred tax liabilities
Excess of net book basis over remaining tax basis	(182,401)	0
Other	(6,652)	(7,672)
Non-U.S.
Deferred tax assets
Deferred pension plan amounts	134	3,120
Accrued expenses not currently deductible	14,085	2,064
Net operating loss carry forwards	0	3,800
Deferred tax liabilities
Excess of net book basis over remaining tax basis	0	(200)
Other	$ (402)	$ (4,305)

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Income Taxes - Income (Loss) from Continuing Operations Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States	$ (81,329)	$ (428,087)	$ 4,031
Non-U.S.	(368,485)	(538,942)	738,402
Total	$ (449,814)	$ (967,029)	$ 742,433

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Income Taxes - Income Tax Provision for Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current- United States	$ (227,707)	$ 61,928	$ 113,648
Current- Non-U.S.	29,010	18,813	81,756
Deferred- United States	257,432	(189,880)	(38,103)
Deferred- United States	(16,106)	(17)	1,931
Total	$ 42,629	$ (109,156)	$ 159,232

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Income Taxes - Reconciliation of Reserve for Uncertain Tax Positions, Excluding Interest and Penalties (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance at January 1,	$ 159,826	$ 169,687	$ 108,812
Additions based on tax positions related to current year	14,187	15,665	31,022
Additions for tax positions of prior years	1,284	18,662	47,561
Reductions for tax positions of prior years	(860)	(43,701)	(11,945)
Expiration of statutes	0	(487)	(1,237)
Tax settlements	0	0	(4,526)
Gross balance at December 31,	174,437	159,826	169,687
Related tax benefits	(1,008)	(1,008)	(14,369)
Net reserve at December 31,	173,429	158,818	$ 155,318
Non-U.S. | Libya | In 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross balance at January 1,	$ 40,000
Gross balance at December 31,		40,000
Related tax benefits		$ (13,000)

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Income Taxes - Summary of Liabilities Related to Reserve for Uncertain Tax Positions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Reserve for uncertain tax positions, excluding interest and penalties	$ 173,429	$ 158,818	$ 155,318
Interest and penalties included in “Other liabilities”	18,431	13,702
Reserve for uncertain tax positions, including interest and penalties	$ 191,860	$ 172,520

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Income Taxes - Effective Tax Reconciliation (Details) - UK income tax	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Tax rates which are different than the UK and Cayman Island rates	23.40%	8.40%	14.40%
Tax impact of asset impairment	11.70%	3.90%	5.30%
Tax impact of tax restructuring	(76.10%)	0.00%	0.00%
Tax impact of tax reform	33.40%	0.00%	0.00%
Reserve for (resolution of) tax authority audits	(1.90%)	(1.00%)	1.70%
Total	(9.50%)	11.30%	21.40%

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Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax Cuts and Jobs Act of 2017, tax benefit	$ 109,000,000
Unrecognized tax benefits	174,437,000	$ 159,826,000	$ 169,687,000	$ 108,812,000
Reserves for uncertain tax positions	191,860,000	172,520,000
Related tax benefits	1,008,000	1,008,000	14,369,000
Amount provision for income taxes reduced if reserves not realized	$ 186,600,000
Operational period	12 months
Interest and penalties resulted in an income tax expense	$ 4,700,000	2,700,000	2,900,000
Non-cash discrete item included in income tax provision from internal tax restructuring	260,700,000
Deferred charges related to deferral of income tax expense related to internal tax restructuring	$ 145,300,000
Foreign tax credits generated and utilized			$ 15,000,000
Undistributed earnings in foreign subsidiaries		$ 0

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Employee Benefit Plans - Narrative (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) plan investment_manager	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of pension plans, salaried employees | plan	1
Number of pension plans, hourly employees | plan	1
Number of investment managers | investment_manager	2
Market cycle minimum period in which objective should be met over	3 years
Market cycle maximum period in which objective should be met over	5 years
Investment equity securities	$ 0	$ 0
Employer contributions	600,000
Costs for maintaining contribution plans	27,600,000	37,200,000	$ 54,800,000
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Liability under the restoration plan	$ 8,800,000	7,700,000
Noble Drilling Corporation Profit Sharing Plan
Defined Benefit Plan Disclosure [Line Items]
Number of years of service for the participants in the plan to become fully vested	3 years
Plan participants’ contributions	$ 3,100,000	6,000,000	6,500,000
Cash holdings
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	1.20%
Investment Manager 1
Defined Benefit Plan Disclosure [Line Items]
Interest rate range maximum	1.25%
Period for investment manager to reach performance objective	3 years
Investment Manager 2
Defined Benefit Plan Disclosure [Line Items]
Interest rate range maximum	200.00%
Period for investment manager to reach performance objective	5 years
Interest rate range minimum	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	31.50%
Equity securities | Noble Drilling Land Support (NDLS)
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	70.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	67.30%
Market cycle minimum period in which objective should be met over	3 years
Market cycle maximum period in which objective should be met over	5 years
Debt securities | Noble Drilling Land Support (NDLS)
Defined Benefit Plan Disclosure [Line Items]
Percentage of company's overall investments	30.00%
Paragon Offshore
Defined Benefit Plan Disclosure [Line Items]
Number of pension plans assumed by subsidiary after spin-off | plan	2
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Number of pension plans | plan	2
Net pension expense	$ (823,000)	2,779,000	2,636,000
Projected benefit obligation	0	5,015,000
Accumulated benefit obligation	$ 0	5,015,000
Market cycle minimum period in which objective should be met over	3 years
Market cycle maximum period in which objective should be met over	5 years
Employer contributions	$ 651,000	2,832,000	2,200,000
Expected contribution to non-U.S. and U.S pension plans	$ 0
U.S.
Defined Benefit Plan Disclosure [Line Items]
Number of pension plans | plan	2
Net pension expense	$ (1,625,000)	8,531,000	10,948,000
Decrease in pension liability	1,600,000	2,900,000	3,000,000
Projected benefit obligation	235,175,000	189,244,000
Accumulated benefit obligation	$ 235,175,000	189,244,000
Market cycle minimum period in which objective should be met over	3 years
Market cycle maximum period in which objective should be met over	5 years
Employer contributions	$ 2,348,000	383,000	$ 500,000
Expected contribution to non-U.S. and U.S pension plans	2,300,000
U.S. | Unfunded excess benefit plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	16,400,000	16,900,000
Accumulated benefit obligation	$ 16,400,000	$ 16,900,000

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Employee Benefit Plans - Reconciliation of Changes in Projected Benefit Obligations for our Non - U.S. and U.S. Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-U.S.
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 72,347	$ 69,372
Service cost	0	2,914	$ 3,344
Interest cost	2,151	2,412	2,546
Actuarial loss (gain)	(11,265)	19,296
Benefits paid	(2,836)	(3,515)
Settlements and curtailments	(4,825)	(5,735)
Plan participants’ contributions	0	307
Foreign exchange rate changes	6,380	(12,704)
Benefit obligation at end of year	61,952	72,347	69,372
U.S.
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	216,577	228,390
Service cost	0	6,647	8,596
Interest cost	8,593	9,557	9,198
Actuarial loss (gain)	19,113	(5,178)
Benefits paid	(6,795)	(5,747)
Settlements and curtailments	(2,313)	(17,092)
Plan participants’ contributions	0	0
Foreign exchange rate changes	0	0
Benefit obligation at end of year	$ 235,175	$ 216,577	$ 228,390

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Employee Benefit Plans - Reconciliation of Changes in Fair Value of Plan Assets (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions	$ 600,000
Non-U.S.
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	71,286,000	$ 75,855,000
Actual return on plan assets	5,594,000	9,371,000
Employer contributions	651,000	2,832,000	$ 2,200,000
Benefits paid	(2,836,000)	(3,515,000)
Plan participants’ contributions	0	307,000
Settlement and curtailment	(4,597,000)	0
Foreign exchange rate changes	7,043,000	(13,564,000)
Fair value of plan assets at end of year	77,141,000	71,286,000	75,855,000
U.S.
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	171,240,000	167,947,000
Actual return on plan assets	24,760,000	8,657,000
Employer contributions	2,348,000	383,000	500,000
Benefits paid	(6,795,000)	(5,747,000)
Plan participants’ contributions	0	0
Settlement and curtailment	(2,313,000)	0
Foreign exchange rate changes	0	0
Fair value of plan assets at end of year	$ 189,240,000	$ 171,240,000	$ 167,947,000

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Employee Benefit Plans - Funded Status of Plans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Funded status	$ 15,189	$ (1,061)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Funded status	$ (45,935)	$ (45,337)

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Employee Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Other assets (noncurrent)	$ 15,189	$ 313
Other liabilities (current)	0	0
Other liabilities (noncurrent)	0	(1,374)
Net amount recognized	15,189	(1,061)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Other assets (noncurrent)	0	229
Other liabilities (current)	(2,312)	(3,857)
Other liabilities (noncurrent)	(43,623)	(41,709)
Net amount recognized	$ (45,935)	$ (45,337)

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Employee Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 2,258	$ 17,035
Deferred income tax asset	(375)	(3,120)
Accumulated other comprehensive loss	1,883	13,915
U.S.
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	39,569	34,200
Deferred income tax asset	(13,849)	(12,250)
Accumulated other comprehensive loss	$ 25,720	$ 21,950

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Employee Benefit Plans - Pension Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 2,914	$ 3,344
Interest cost	2,151	2,412	2,546
Return on plan assets	(2,879)	(3,393)	(3,673)
Amortization of prior service cost	0	104	104
Recognized net actuarial loss	743	142	315
Settlement and curtailment gains	(838)	600	0
Net pension benefit cost (gain)	(823)	2,779	2,636
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	6,647	8,596
Interest cost	8,593	9,557	9,198
Return on plan assets	(11,764)	(12,389)	(13,146)
Amortization of prior service cost	0	118	142
Recognized net actuarial loss	1,464	4,398	6,158
Settlement and curtailment gains	82	200	0
Net pension benefit cost (gain)	$ (1,625)	$ 8,531	$ 10,948

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Employee Benefit Plans - Disaggregated Plan Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 61,952	$ 72,347	$ 69,372
Accumulated benefit obligation	61,952	72,347
Fair value of plan assets	77,141	71,286	75,855
U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	235,175	216,577	228,390
Accumulated benefit obligation	235,175	216,577
Fair value of plan assets	$ 189,240	$ 171,240	$ 167,947

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Employee Benefit Plans - Plans in which PBO Exceeded Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 0	$ 5,015
Fair value of plan assets	0	3,642
U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	235,175	189,244
Fair value of plan assets	$ 189,240	$ 143,678

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Employee Benefit Plans - Plans in which Accumulated Benefit Obligation Exceeded Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 0	$ 5,015
Fair value of plan assets	0	3,642
U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	235,175	189,244
Fair value of plan assets	$ 189,240	$ 143,678

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Employee Benefit Plans - Defined Benefit Plans Key Assumptions (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted-average assumptions used to determine benefit obligations:
Discount Rate	2.60%
Rate of compensation increase		3.60%
Minimum
Weighted-average assumptions used to determine periodic benefit cost:
Rate of compensation increase			2.00%
Maximum
Weighted-average assumptions used to determine periodic benefit cost:
Rate of compensation increase			5.00%
Non-U.S.
Weighted-average assumptions used to determine periodic benefit cost:
Expected long-term return on assets	4.10%
Non-U.S. | Minimum
Weighted-average assumptions used to determine benefit obligations:
Discount Rate		2.15%
Weighted-average assumptions used to determine periodic benefit cost:
Discount Rate	2.48%	2.15%	2.60%
Expected long-term return on assets		1.60%	1.60%
Rate of compensation increase		3.60%	3.60%
Non-U.S. | Maximum
Weighted-average assumptions used to determine benefit obligations:
Discount Rate		2.70%
Weighted-average assumptions used to determine periodic benefit cost:
Discount Rate	2.70%	3.90%	3.70%
Expected long-term return on assets		5.00%	4.90%
Rate of compensation increase		4.20%	4.10%
U.S.
Weighted-average assumptions used to determine periodic benefit cost:
Discount Rate		3.09%
Expected long-term return on assets		7.00%	7.50%
U.S. | Minimum
Weighted-average assumptions used to determine benefit obligations:
Discount Rate	2.84%	3.00%
Weighted-average assumptions used to determine periodic benefit cost:
Discount Rate	3.00%		2.98%
Expected long-term return on assets	6.00%
U.S. | Maximum
Weighted-average assumptions used to determine benefit obligations:
Discount Rate	3.66%	4.24%
Weighted-average assumptions used to determine periodic benefit cost:
Discount Rate	4.24%	4.48%	4.38%
Expected long-term return on assets	6.50%

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Employee Benefit Plans - Actual Fair Values of Pension Plans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	$ 77,141	$ 71,286
Estimated Fair Value Measurements	77,141	71,286	$ 75,855
Non-U.S. | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	77,141	67,644
Non-U.S. | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-U.S. | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	3,642
Non-U.S. | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	280	337
Non-U.S. | Cash and cash equivalents | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	280	337
Non-U.S. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	54,145	46,845
Non-U.S. | Equity securities | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	54,145	46,845
Non-U.S. | Equity securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-U.S. | Equity securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-U.S. | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	22,716	20,462
Non-U.S. | Corporate bonds | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	22,716	20,462
Non-U.S. | Corporate bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-U.S. | Corporate bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-U.S. | Other
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount		3,642
Non-U.S. | Other | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements		0
Non-U.S. | Other | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements		0
Non-U.S. | Other | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements		3,642
U.S.
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	189,240	171,240
Estimated Fair Value Measurements	189,240	171,240	$ 167,947
U.S. | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	162,135	171,240
U.S. | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	27,105	0
U.S. | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
U.S. | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	3,275	2,524
U.S. | Cash and cash equivalents | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	3,275	2,524
U.S. | Equity securities | United States
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	43,535	80,264
U.S. | Equity securities | International
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	17,712	34,049
U.S. | Equity securities | Quoted Prices in Active Markets (Level 1) | United States
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	16,430	80,264
U.S. | Equity securities | Quoted Prices in Active Markets (Level 1) | International
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	17,712	34,049
U.S. | Equity securities | Significant Other Observable Inputs (Level 2) | United States
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	27,105	0
U.S. | Equity securities | Significant Other Observable Inputs (Level 2) | International
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
U.S. | Equity securities | Significant Unobservable Inputs (Level 3) | United States
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
U.S. | Equity securities | Significant Unobservable Inputs (Level 3) | International
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
U.S. | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	40,793	54,403
U.S. | Corporate bonds | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	40,793	54,403
U.S. | Corporate bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
U.S. | Corporate bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	$ 0
U.S. | Treasury bonds
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	83,925
U.S. | Treasury bonds | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	83,925
U.S. | Treasury bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0
U.S. | Treasury bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	$ 0

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Employee Benefit Plans - Estimated Benefit Payments (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Total	$ 145,613
2018	12,623
2019	12,093
2020	12,643
2021	16,778
2022	15,890
Thereafter	75,586
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Total	36,203
2018	3,079
2019	3,189
2020	3,301
2021	3,419
2022	3,540
Thereafter	19,675
U.S.
Defined Benefit Plan Disclosure [Line Items]
Total	109,410
2018	9,544
2019	8,904
2020	9,342
2021	13,359
2022	12,350
Thereafter	$ 55,911

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Derivative Instruments and Hedging Activities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) payment	Jun. 30, 2017 USD ($) $ / bbl	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Number of contingent payments | payment	2
FCX Settlement
Derivative [Line Items]
Derivative contingent settlement period		12 months
FCX Settlement | Noble Corp
Derivative [Line Items]
Estimated fair value of contingent payments		$ 0
FCX Settlement | WTI Crude Oil Averages Price More than $50 Per Barrel
Derivative [Line Items]
Crude oil average price | $ / bbl		50
Non designated derivatives contingent payment		$ 25,000,000
FCX Settlement | WTI Crude Oil Averages Price More than $65 Per Barrel
Derivative [Line Items]
Crude oil average price | $ / bbl		65
Non designated derivatives contingent payment		$ 50,000,000
Forward contracts
Derivative [Line Items]
Derivative Instrument Settlement Amount	$ 37,600,000		$ 53,100,000
Price risk derivative
Derivative [Line Items]
Notional amount of forward contracts outstanding	$ 0		$ 0

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Derivative Instruments and Hedging Activities - Summarization of Financial Statement Presentation and Fair Value of Derivative Positions (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-designated derivatives | FCX Settlement | Prepaid expenses and other current assets
Asset derivatives
FCX Settlement	$ 0	$ 14,400

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Derivative Instruments and Hedging Activities - Summarization of Recognized Gains and Losses of Cash Flow Hedges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Non-designated derivatives | FCX Settlement
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain/(loss) recognized through AOCL	$ 0	$ 0
Non-designated derivatives | Contract drilling services | FCX Settlement
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) reclassified from AOCL to Contract drilling services costs	0	0
Gain/(loss) recognized through Contract drilling services revenue	(14,400)	14,400
Foreign currency forward contracts | Designated as hedging | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain/(loss) recognized through AOCL	(1,239)	(1,187)
Foreign currency forward contracts | Designated as hedging | Contract drilling services | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) reclassified from AOCL to Contract drilling services costs	0	0
Gain/(loss) recognized through Contract drilling services revenue	$ 1,239	$ 1,187

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Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Detail) - Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Quoted Prices in Active Markets (Level 1)
Assets -
Marketable securities	$ 7,321	$ 6,246
FCX Settlement		0
Significant Other Observable Inputs (Level 2)
Assets -
Marketable securities	0	0
FCX Settlement		0
Significant Unobservable Inputs (Level 3)
Assets -
Marketable securities	0	0
FCX Settlement		14,400
Carrying Value
Assets -
Marketable securities	$ 7,321	6,246
FCX Settlement		$ 14,400

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Fair Value of Financial Instruments Fair Value of Financial Instruments - Settlement Asset from FCX (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Combination, Contingent Consideration, Asset [Roll Forward]
Beginning balance	$ 14,400	$ 0
Fair value recognized in earnings		17,600
Change in fair value recognized in earnings	(14,400)	(3,200)
Ending balance	$ 0	$ 14,400

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Commitments and Contingencies - Additional Information (Details) $ in Thousands	1 Months Ended		3 Months Ended				12 Months Ended
	Jan. 31, 2017 Rig	Dec. 31, 2014 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	May 02, 2017 USD ($)
Other Commitments [Line Items]
Number of newbuild rigs allegedly infringing patent | Rig	5
Net charges recognized relating to Paragon Offshore emergence from bankruptcy							$ 15,900
Net loss from discontinued operations, net of tax			$ 0	$ 0	$ (1,486)	$ 0	$ (1,486)	$ 0	$ 0
Years of effectiveness of employment agreements after the termination of employment							3 years
Operating Leases, Rent Expense							$ 8,300	$ 7,800	$ 8,700
Minimum
Other Commitments [Line Items]
Percentage of uncertain tax positions likelihood of being sustained							50.00%
Paragon Offshore
Other Commitments [Line Items]
Litigation trust fund										$ 10,000
Customs And Other Business Taxes | Mexico | Non-U.S.
Other Commitments [Line Items]
Approximate audit claims assessed							$ 48,300
Noble Discoverer And Kulluk
Other Commitments [Line Items]
Loss contingencies payments		$ 8,200
Environmental Compliance Plan, probationary period		4 years
Noble Discoverer And Kulluk | Community Service Payment
Other Commitments [Line Items]
Loss contingencies payments		$ 4,000

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Commitments and Contingencies - Future Minimum Operating Lease Payments (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2018	$ 18,720
2019	14,046
2020	2,564
2021	1,853
2022	1,586
Thereafter	3,840
Total	$ 42,609

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Segment and Related Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 329,585	$ 266,212	$ 278,142	$ 362,976	$ 410,156	$ 385,153	$ 894,783	$ 611,973	$ 1,236,915	$ 2,302,065	$ 3,352,252
Identifiable Assets	10,794,659				11,440,117				10,794,659	11,440,117
Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									48,228	1,803	0
Identifiable Assets	0				673,486				0	673,486
Argentina
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	51,627	111,589
Identifiable Assets	0				0				0	0
Australia
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									12,262	89,847	204,822
Identifiable Assets	257,415				0				257,415	0
Brazil
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	27,640	78,683
Identifiable Assets	25,645				25,474				25,645	25,474
Brunei
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									45,450	42,710	0
Identifiable Assets	119				312,494				119	312,494
Bulgaria
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									55,145	78,985	0
Identifiable Assets	657,806				0				657,806	0
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									1,639	0	0
Identifiable Assets	238,902				0				238,902	0
Curacao
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	0	0
Identifiable Assets	647,554				0				647,554	0
Denmark
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									44,671	46,342	77,934
Identifiable Assets	250,851				250,776				250,851	250,776
Gabon
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	23,385	90,082
Identifiable Assets	8,378				0				8,378	0
Libya
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	0	136,406
Identifiable Assets	0				0				0	0
Malaysia
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									131,696	168,826	149,597
Identifiable Assets	293,297				747,059				293,297	747,059
Mexico
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	0	0
Identifiable Assets	27,391				0				27,391	0
Qatar
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									16,488	608	0
Identifiable Assets	0				263,108				0	263,108
Saudi Arabia
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									140,453	120,132	226,251
Identifiable Assets	455,296				443,965				455,296	443,965
Singapore
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	0	0
Identifiable Assets	911,515				230,897				911,515	230,897
Suriname
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									13,034	0	0
Identifiable Assets	0				0				0	0
Tanzania
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									1,526	48,394	0
Identifiable Assets	0				0				0	0
The Netherlands
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	42	67,765
Identifiable Assets	0				0				0	0
Turkey
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									(3)	0	97,065
Identifiable Assets	0				0				0	0
United Arab Emirates
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									99,825	86,446	67,117
Identifiable Assets	590,863				591,306				590,863	591,306
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									209,338	95,621	87,896
Identifiable Assets	894,902				1,475,651				894,902	1,475,651
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									417,163	1,404,365	1,941,485
Identifiable Assets	5,534,725				6,399,119				5,534,725	6,399,119
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									0	15,292	$ 15,560
Identifiable Assets	$ 0				$ 26,782				$ 0	$ 26,782

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Supplemental Financial Information - Additional Information (Detail) $ in Millions	Dec. 31, 2017 USD ($) Rig	Dec. 31, 2016 USD ($)	Dec. 31, 2015 Rig	Apr. 30, 2015 Rig
Schedule Of Supplemental Financial Information [Line Items]
Deferred revenues under drilling contracts	$ 114.3	$ 134.4
Deferred expenses under drilling contracts	$ 55.7	72.8
Aramco
Schedule Of Supplemental Financial Information [Line Items]
Number of rigs | Rig	5		5	5
Revenues recorded in excess of billings	$ 6.9	17.9
Aramco | Prepaid expenses and other current assets
Schedule Of Supplemental Financial Information [Line Items]
Revenues recorded in excess of billings	$ 6.9	9.2
Aramco | Other assets
Schedule Of Supplemental Financial Information [Line Items]
Revenues recorded in excess of billings		$ 8.7

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Supplemental Financial Information - Effect of Changes in Other Assets and Liabilities on Cash Flows from Operating Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Net change in other assets and liabilities	$ (21,237)	$ 87,124	$ 126,103
Noble-UK
Supplemental Cash Flow Elements [Abstract]
Accounts receivable	114,456	179,779	70,165
Other current assets	(23,710)	81,702	61,514
Other assets	(87,377)	139,872	106,354
Accounts payable	22,638	(84,873)	(30,771)
Other current liabilities	34,568	(209,739)	(54,940)
Other liabilities	(81,812)	(19,617)	(26,219)
Net change in other assets and liabilities	(21,237)	87,124	126,103
Noble - Cayman
Supplemental Cash Flow Elements [Abstract]
Accounts receivable	114,456	179,779	70,165
Other current assets	(26,556)	79,682	23,047
Other assets	(89,591)	137,792	89,877
Accounts payable	22,834	(83,085)	(28,538)
Other current liabilities	35,695	(205,969)	(34,024)
Other liabilities	(76,929)	(20,960)	(25,562)
Net change in other assets and liabilities	$ (20,091)	$ 87,239	$ 94,965

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Supplemental Financial Information - Additional Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Noble-UK
Supplemental Cash Flow Elements [Abstract]
Interest, net of amounts capitalized	$ 246,960	$ 232,907	$ 190,917
Income taxes (net of refunds)	30,590	100,544	89,292
Noble - Cayman
Supplemental Cash Flow Elements [Abstract]
Interest, net of amounts capitalized	246,960	232,907	190,917
Income taxes (net of refunds)	$ 30,590	$ 100,717	$ 88,948

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Condensed Consolidating Financial Information - Guarantor Obligations (Detail)	Dec. 31, 2017 USD ($)
5.75% Senior Notes due March 2018
Guarantor Obligations [Line Items]
Face value of senior notes	$ 250,000,000
Interest rate on senior notes	5.75%
7.50% Senior Notes due March 2019
Guarantor Obligations [Line Items]
Face value of senior notes	$ 202,000,000
Interest rate on senior notes	7.50%
4.90% Senior Notes due August 2020
Guarantor Obligations [Line Items]
Face value of senior notes	$ 168,000,000
Interest rate on senior notes	4.90%
4.625% Senior Notes due March 2021
Guarantor Obligations [Line Items]
Face value of senior notes	$ 209,000,000
Interest rate on senior notes	4.625%
3.95% Senior Notes due March 2022
Guarantor Obligations [Line Items]
Face value of senior notes	$ 126,000,000
Interest rate on senior notes	3.95%
7.75% Senior Notes due January 2024
Guarantor Obligations [Line Items]
Face value of senior notes	$ 1,000,000,000
Interest rate on senior notes	7.75%
7.70% Senior Notes due April 2025
Guarantor Obligations [Line Items]
Face value of senior notes	$ 450,000,000
Interest rate on senior notes	7.70%
6.20% Senior Notes due August 2040
Guarantor Obligations [Line Items]
Face value of senior notes	$ 400,000,000
Interest rate on senior notes	6.20%
6.05% Senior Notes due March 2041
Guarantor Obligations [Line Items]
Face value of senior notes	$ 400,000,000
Interest rate on senior notes	6.05%
5.25% Senior Notes due March 2042
Guarantor Obligations [Line Items]
Face value of senior notes	$ 500,000,000
Interest rate on senior notes	5.25%
8.70% Senior Notes due April 2045
Guarantor Obligations [Line Items]
Face value of senior notes	$ 400,000,000
Interest rate on senior notes	8.70%

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Condensed Consolidating Financial Information - Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 662,829	$ 725,722	$ 512,245	$ 68,510
Accounts receivable	204,696	319,152
Taxes receivable	105,345	55,480
Prepaid expenses and other current assets	66,105	92,260
Total current assets	1,038,975	1,192,614
Property and equipment, at cost	12,034,331	12,364,888
Accumulated depreciation	(2,545,091)	(2,302,940)
Property and equipment, net	9,489,240	10,061,948
Other assets	266,444	185,555
Total assets	10,794,659	11,440,117
Current liabilities
Current maturities of long-term debt	249,843	299,882
Accounts payable	84,032	108,224
Accrued payroll and related costs	54,904	48,383
Taxes payable	34,391	46,561
Interest payable	98,189	61,299
Other current liabilities	71,665	68,944
Total current liabilities	593,024	633,293
Long-term debt	3,795,867	4,040,229
Deferred income taxes	164,962	2,084
Other liabilities	290,178	297,066
Total liabilities	4,844,031	4,972,672
Commitments and contingencies
Total shareholder equity	5,276,161	5,758,681
Noncontrolling interests	674,467	708,764
Total equity	5,950,628	6,467,445	7,422,230	7,287,034
Total liabilities and equity	10,794,659	11,440,117
Consolidating Adjustments
Current assets
Cash and cash equivalents	0	0	0	0
Accounts receivable	0	0
Taxes receivable	0	0
Short-term notes receivable from affiliates	(2,492,928)	(1,646,234)
Accounts receivable from affiliates	(7,080,817)	(3,690,281)
Prepaid expenses and other current assets	0	0
Total current assets	(9,573,745)	(5,336,515)
Property and equipment, at cost	0	0
Accumulated depreciation	0	0
Property and equipment, net	0	0
Notes receivable from affiliates	(9,495,662)	(5,290,556)
Investments in affiliates	(34,534,543)	(20,766,555)
Other assets	0	0
Total assets	(53,603,950)	(31,393,626)
Current liabilities
Short-term notes payables from affiliates	(2,492,928)	(1,646,234)
Current maturities of long-term debt	0	0
Accounts payable	0	0
Accrued payroll and related costs	0	0
Accounts payable to affiliates	(7,080,817)	(3,690,281)
Taxes payable	0	0
Interest payable	0	0
Other current liabilities	0	0
Total current liabilities	(9,573,745)	(5,336,515)
Long-term debt	0	0
Notes payable to affiliates	(9,495,662)	(5,290,556)
Deferred income taxes	0	0
Other liabilities	0	0
Total liabilities	(19,069,407)	(10,627,071)
Commitments and contingencies
Total shareholder equity	(34,534,543)	(20,362,710)
Noncontrolling interests	0	(403,845)
Total equity	(34,534,543)	(20,766,555)
Total liabilities and equity	(53,603,950)	(31,393,626)
Other Non-guarantor Subsidiaries of Noble
Current assets
Cash and cash equivalents	609,516	640,441	508,067	65,521
Accounts receivable	179,974	285,990
Taxes receivable	12,040	34,052
Short-term notes receivable from affiliates	0	52,611
Accounts receivable from affiliates	5,813,846	3,038,658
Prepaid expenses and other current assets	63,963	86,868
Total current assets	6,679,339	4,138,620
Property and equipment, at cost	11,176,547	9,988,026
Accumulated depreciation	(2,435,086)	(1,874,632)
Property and equipment, net	8,741,461	8,113,394
Notes receivable from affiliates	1,175,300	1,798,614
Investments in affiliates	0	0
Other assets	238,718	168,573
Total assets	16,834,818	14,219,201
Current liabilities
Short-term notes payables from affiliates	887,685	1,474,309
Current maturities of long-term debt	0	0
Accounts payable	82,406	103,640
Accrued payroll and related costs	50,124	43,437
Accounts payable to affiliates	845,634	640,313
Taxes payable	33,965	46,561
Interest payable	0	0
Other current liabilities	66,297	63,004
Total current liabilities	1,966,111	2,371,264
Long-term debt	0	0
Notes payable to affiliates	5,145,362	3,379,236
Deferred income taxes	164,957	1,550
Other liabilities	239,919	248,219
Total liabilities	7,516,349	6,000,269
Commitments and contingencies
Total shareholder equity	8,644,002	7,106,323
Noncontrolling interests	674,467	1,112,609
Total equity	9,318,469	8,218,932
Total liabilities and equity	16,834,818	14,219,201
Noble - Cayman
Current assets
Cash and cash equivalents	11	2,537	1,627	5
Accounts receivable	0	0
Taxes receivable	0	0
Short-term notes receivable from affiliates	0	0
Accounts receivable from affiliates	594,456	361,313
Prepaid expenses and other current assets	0	270
Total current assets	594,467	364,120
Property and equipment, at cost	0	0
Accumulated depreciation	0	0
Property and equipment, net	0	0
Notes receivable from affiliates	3,177,248	3,304,672
Investments in affiliates	4,933,978	2,848,855
Other assets	2,663	4,292
Total assets	8,708,356	6,521,939
Current liabilities
Short-term notes payables from affiliates	0	0
Current maturities of long-term debt	0	0
Accounts payable	0	0
Accrued payroll and related costs	0	0
Accounts payable to affiliates	3,410,669	818,737
Taxes payable	0	0
Interest payable	2,211	48
Other current liabilities	0	12
Total current liabilities	3,412,880	818,797
Long-term debt	0	0
Notes payable to affiliates	0	0
Deferred income taxes	0	0
Other liabilities	19,929	19,929
Total liabilities	3,432,809	838,726
Commitments and contingencies
Total shareholder equity	5,275,547	5,683,213
Noncontrolling interests	0	0
Total equity	5,275,547	5,683,213
Total liabilities and equity	8,708,356	6,521,939
NHUS
Current assets
Cash and cash equivalents	0	0	0	0
Accounts receivable	0	0
Taxes receivable	93,302	21,428
Short-term notes receivable from affiliates	0	0
Accounts receivable from affiliates	1,454	0
Prepaid expenses and other current assets	0	0
Total current assets	94,756	21,428
Property and equipment, at cost	0	0
Accumulated depreciation	0	0
Property and equipment, net	0	0
Notes receivable from affiliates	0	0
Investments in affiliates	4,550,358	2,007,016
Other assets	16,775	0
Total assets	4,661,889	2,028,444
Current liabilities
Short-term notes payables from affiliates	1,605,243	171,925
Current maturities of long-term debt	0	0
Accounts payable	0	0
Accrued payroll and related costs	0	0
Accounts payable to affiliates	393,073	111,801
Taxes payable	0	0
Interest payable	0	0
Other current liabilities	0	0
Total current liabilities	1,998,316	283,726
Long-term debt	0	0
Notes payable to affiliates	700,000	700,000
Deferred income taxes	0	0
Other liabilities	0	0
Total liabilities	2,698,316	983,726
Commitments and contingencies
Total shareholder equity	1,963,573	1,044,718
Noncontrolling interests	0	0
Total equity	1,963,573	1,044,718
Total liabilities and equity	4,661,889	2,028,444
NDH
Current assets
Cash and cash equivalents	23,160	10,855	2,101	254
Accounts receivable	24,722	33,162
Taxes receivable	3	0
Short-term notes receivable from affiliates	119,476	243,915
Accounts receivable from affiliates	144,367	137,476
Prepaid expenses and other current assets	1,477	1,611
Total current assets	313,205	427,019
Property and equipment, at cost	857,784	2,376,862
Accumulated depreciation	(110,005)	(428,308)
Property and equipment, net	747,779	1,948,554
Notes receivable from affiliates	1,199,815	112,706
Investments in affiliates	5,252,135	1,411,874
Other assets	8,372	5,687
Total assets	7,521,306	3,905,840
Current liabilities
Short-term notes payables from affiliates	0	0
Current maturities of long-term debt	0	0
Accounts payable	1,467	4,228
Accrued payroll and related costs	4,780	4,882
Accounts payable to affiliates	1,770,066	1,995,788
Taxes payable	0	0
Interest payable	0	0
Other current liabilities	5,169	4,296
Total current liabilities	1,781,482	2,009,194
Long-term debt	0	0
Notes payable to affiliates	474,637	467,139
Deferred income taxes	5	534
Other liabilities	30,330	24,035
Total liabilities	2,286,454	2,500,902
Commitments and contingencies
Total shareholder equity	5,234,852	1,404,938
Noncontrolling interests	0	0
Total equity	5,234,852	1,404,938
Total liabilities and equity	7,521,306	3,905,840
NHIL
Current assets
Cash and cash equivalents	29,324	0	0	0
Accounts receivable	0	0
Taxes receivable	0	0
Short-term notes receivable from affiliates	0	0
Accounts receivable from affiliates	60,945	67,560
Prepaid expenses and other current assets	0	0
Total current assets	90,269	67,560
Property and equipment, at cost	0	0
Accumulated depreciation	0	0
Property and equipment, net	0	0
Notes receivable from affiliates	0	69,564
Investments in affiliates	12,560,598	8,369,728
Other assets	0	0
Total assets	12,650,867	8,506,852
Current liabilities
Short-term notes payables from affiliates	0	0
Current maturities of long-term debt	249,843	299,882
Accounts payable	0	0
Accrued payroll and related costs	0	0
Accounts payable to affiliates	661,375	123,642
Taxes payable	0	0
Interest payable	83,960	56,839
Other current liabilities	0	0
Total current liabilities	995,178	480,363
Long-term debt	3,594,332	3,838,807
Notes payable to affiliates	3,175,663	744,181
Deferred income taxes	0	0
Other liabilities	0	0
Total liabilities	7,765,173	5,063,351
Commitments and contingencies
Total shareholder equity	4,885,694	3,443,501
Noncontrolling interests	0	0
Total equity	4,885,694	3,443,501
Total liabilities and equity	12,650,867	8,506,852
NDS6
Current assets
Cash and cash equivalents	0	0	0	0
Accounts receivable	0	0
Taxes receivable	0	0
Short-term notes receivable from affiliates	2,373,452	1,349,708
Accounts receivable from affiliates	465,749	85,274
Prepaid expenses and other current assets	1	0
Total current assets	2,839,202	1,434,982
Property and equipment, at cost	0	0
Accumulated depreciation	0	0
Property and equipment, net	0	0
Notes receivable from affiliates	3,943,299	5,000
Investments in affiliates	7,237,474	6,129,082
Other assets	0	0
Total assets	14,019,975	7,569,064
Current liabilities
Short-term notes payables from affiliates	0	0
Current maturities of long-term debt	0	0
Accounts payable	0	0
Accrued payroll and related costs	0	0
Accounts payable to affiliates	0	0
Taxes payable	0	0
Interest payable	12,018	4,412
Other current liabilities	0	0
Total current liabilities	12,018	4,412
Long-term debt	201,535	201,422
Notes payable to affiliates	0	0
Deferred income taxes	0	0
Other liabilities	0	0
Total liabilities	213,553	205,834
Commitments and contingencies
Total shareholder equity	13,806,422	7,363,230
Noncontrolling interests	0	0
Total equity	13,806,422	7,363,230
Total liabilities and equity	14,019,975	7,569,064
Noble Corp
Current assets
Cash and cash equivalents	662,011	653,833	511,795	65,780
Accounts receivable	204,696	319,152
Taxes receivable	105,345	55,480
Short-term notes receivable from affiliates	0	0
Accounts receivable from affiliates	0	0
Prepaid expenses and other current assets	65,441	88,749
Total current assets	1,037,493	1,117,214
Property and equipment, at cost	12,034,331	12,364,888
Accumulated depreciation	(2,545,091)	(2,302,940)
Property and equipment, net	9,489,240	10,061,948
Notes receivable from affiliates	0	0
Investments in affiliates	0	0
Other assets	266,528	178,552
Total assets	10,793,261	11,357,714
Current liabilities
Short-term notes payables from affiliates	0	0
Current maturities of long-term debt	249,843	299,882
Accounts payable	83,873	107,868
Accrued payroll and related costs	54,904	48,319
Accounts payable to affiliates	0	0
Taxes payable	33,965	46,561
Interest payable	98,189	61,299
Other current liabilities	71,466	67,312
Total current liabilities	592,240	631,241
Long-term debt	3,795,867	4,040,229
Notes payable to affiliates	0	0
Deferred income taxes	164,962	2,084
Other liabilities	290,178	292,183
Total liabilities	4,843,247	4,965,737
Commitments and contingencies
Total shareholder equity	5,275,547	5,683,213
Noncontrolling interests	674,467	708,764
Total equity	5,950,014	6,391,977	$ 7,414,471	$ 7,218,782
Total liabilities and equity	$ 10,793,261	$ 11,357,714

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Condensed Consolidating Financial Information - Operations and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating revenues
Contract drilling services									$ 1,207,026	$ 2,242,200	$ 3,261,610
Reimbursables and other									29,889	59,865	90,642
Total operating revenues	$ 329,585	$ 266,212	$ 278,142	$ 362,976	$ 410,156	$ 385,153	$ 894,783	$ 611,973	1,236,915	2,302,065	3,352,252
Operating costs and expenses
Contract drilling services									640,489	879,438	1,232,529
Reimbursables									18,435	45,499	70,276
Depreciation and amortization									547,990	611,067	634,305
General and administrative									71,634	69,258	76,843
Loss on impairment									121,639	1,458,749	418,298
Total operating costs and expenses									1,400,187	3,064,011	2,432,251
Operating income (loss)	(109,656)	(55,588)	(43,875)	45,847	(1,384,912)	(2,208)	449,714	175,460	(163,272)	(761,946)	920,001
Other income (expense)
Interest expense, net of amounts capitalized									(291,989)	(222,915)	(213,854)
Gain on extinguishment of debt, net									0	17,814	0
Interest income and other, net									5,449	18	36,286
Income (loss) from continuing operations before income taxes									(449,812)	(967,029)	742,433
Income tax benefit (provision)									(42,629)	109,156	(159,232)
Net income (loss) from continuing operations									(492,441)	(857,873)	583,201
Net income (loss) from discontinued operations, net of tax									(1,486)	0	0
Net income (loss)									(493,927)	(857,873)	583,201
Net income attributable to noncontrolling interests									(22,584)	(71,707)	(72,201)
Net income (loss) attributable to the company	$ (24,675)	$ (96,792)	$ (91,864)	$ (301,694)	$ (1,302,850)	$ (55,081)	$ 322,866	$ 105,485	(516,511)	(929,580)	511,000
Other comprehensive income, net									9,252	11,035	6,243
Comprehensive income (loss) attributable to the company									(507,259)	(918,545)	517,243
Consolidating Adjustments
Operating revenues
Contract drilling services									(47,886)	(94,697)	(418,655)
Reimbursables and other									0	0	0
Total operating revenues									(47,886)	(94,697)	(418,655)
Operating costs and expenses
Contract drilling services									(47,886)	(94,697)	(418,655)
Reimbursables									0	0	0
Depreciation and amortization									0	0	0
General and administrative									0	0	0
Loss on impairment									0	0	0
Total operating costs and expenses									(47,886)	(94,697)	(418,655)
Operating income (loss)									0	0	0
Other income (expense)
Income (loss) of unconsolidated affiliates									715,805	2,017,831	(2,439,236)
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax									(7,533)
Interest expense, net of amounts capitalized									341,603	252,816	198,255
Gain on extinguishment of debt, net										0	0
Interest income and other, net									(341,603)	(252,816)	(198,255)
Income (loss) from continuing operations before income taxes									708,272	2,017,831	(2,439,236)
Income tax benefit (provision)									0	0	0
Net income (loss) from continuing operations									708,272
Net income (loss) from discontinued operations, net of tax									0
Net income (loss)									708,272	2,017,831	(2,439,236)
Net income attributable to noncontrolling interests									(1,995)	(32,413)	33,039
Net income (loss) attributable to the company									706,277	1,985,418	(2,406,197)
Other comprehensive income, net									(9,252)	(11,035)	(6,243)
Comprehensive income (loss) attributable to the company									697,025	1,974,383	(2,412,440)
Other Non-guarantor Subsidiaries of Noble
Operating revenues
Contract drilling services									1,086,320	2,086,848	3,325,608
Reimbursables and other									26,446	51,375	72,313
Total operating revenues									1,112,766	2,138,223	3,397,921
Operating costs and expenses
Contract drilling services									627,251	789,814	1,142,891
Reimbursables									16,443	37,268	56,590
Depreciation and amortization									484,883	519,211	556,057
General and administrative									33,600	(4,018)	7,446
Loss on impairment									76,627	1,458,749	418,285
Total operating costs and expenses									1,238,804	2,801,024	2,181,269
Operating income (loss)									(126,038)	(662,801)	1,216,652
Other income (expense)
Income (loss) of unconsolidated affiliates									0	0	0
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax									0
Interest expense, net of amounts capitalized									(130,442)	(122,345)	(68,670)
Gain on extinguishment of debt, net										0	0
Interest income and other, net									19,716	108,108	75,071
Income (loss) from continuing operations before income taxes									(236,764)	(677,038)	1,223,053
Income tax benefit (provision)									(284,115)	151,522	(80,225)
Net income (loss) from continuing operations									(520,879)
Net income (loss) from discontinued operations, net of tax									4,565
Net income (loss)									(516,314)	(525,516)	1,142,828
Net income attributable to noncontrolling interests									(20,589)	(39,294)	(105,240)
Net income (loss) attributable to the company									(536,903)	(564,810)	1,037,588
Other comprehensive income, net									9,252	11,035	6,243
Comprehensive income (loss) attributable to the company									(527,651)	(553,775)	1,043,831
Noble - Cayman
Operating revenues
Contract drilling services									0	0	0
Reimbursables and other									0	0	0
Total operating revenues									0	0	0
Operating costs and expenses
Contract drilling services									304	4,532	3,611
Reimbursables									0	0	0
Depreciation and amortization									0	0	0
General and administrative									129	1,264	1,138
Loss on impairment									0	0	0
Total operating costs and expenses									433	5,796	4,749
Operating income (loss)									(433)	(5,796)	(4,749)
Other income (expense)
Income (loss) of unconsolidated affiliates									(476,382)	(962,662)	591,297
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax									2,967
Interest expense, net of amounts capitalized									(10,951)	(27,891)	(75,925)
Gain on extinguishment of debt, net										0	0
Interest income and other, net									10,483	96,635	24,188
Income (loss) from continuing operations before income taxes									(474,316)	(899,714)	534,811
Income tax benefit (provision)									0	0	0
Net income (loss) from continuing operations									(474,316)
Net income (loss) from discontinued operations, net of tax									0
Net income (loss)									(474,316)	(899,714)	534,811
Net income attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to the company									(474,316)	(899,714)	534,811
Other comprehensive income, net									9,252	11,035	6,243
Comprehensive income (loss) attributable to the company									(465,064)	(888,679)	541,054
NHUS
Operating revenues
Contract drilling services									0	0	0
Reimbursables and other									0	0	0
Total operating revenues									0	0	0
Operating costs and expenses
Contract drilling services									12,090	18,902	19,160
Reimbursables									0	0	0
Depreciation and amortization									0	0	0
General and administrative									5,761	8,716	8,683
Loss on impairment									0	0	0
Total operating costs and expenses									17,851	27,618	27,843
Operating income (loss)									(17,851)	(27,618)	(27,843)
Other income (expense)
Income (loss) of unconsolidated affiliates									(528,702)	(257,142)	73,319
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax									4,566
Interest expense, net of amounts capitalized									(32,838)	(70,494)	(4,932)
Gain on extinguishment of debt, net										0	0
Interest income and other, net									(141)	120	4,852
Income (loss) from continuing operations before income taxes									(574,966)	(355,134)	45,396
Income tax benefit (provision)									241,960	(42,522)	(77,929)
Net income (loss) from continuing operations									(333,006)
Net income (loss) from discontinued operations, net of tax									(1,598)
Net income (loss)									(334,604)	(397,656)	(32,533)
Net income attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to the company									(334,604)	(397,656)	(32,533)
Other comprehensive income, net									0	0	0
Comprehensive income (loss) attributable to the company									(334,604)	(397,656)	(32,533)
NDH
Operating revenues
Contract drilling services									168,592	250,049	354,657
Reimbursables and other									3,443	9,190	18,529
Total operating revenues									172,035	259,239	373,186
Operating costs and expenses
Contract drilling services									43,161	70,801	395,365
Reimbursables									1,992	8,231	13,686
Depreciation and amortization									58,236	91,802	77,187
General and administrative									0	0	0
Loss on impairment									45,012	0	13
Total operating costs and expenses									148,401	170,834	486,251
Operating income (loss)									23,634	88,405	(113,065)
Other income (expense)
Income (loss) of unconsolidated affiliates									82,596	(980,099)	190,335
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax									0
Interest expense, net of amounts capitalized									(13,493)	(11,461)	(12,110)
Gain on extinguishment of debt, net										0	0
Interest income and other, net									87,287	12,616	52,026
Income (loss) from continuing operations before income taxes									180,024	(890,539)	117,186
Income tax benefit (provision)									(440)	163	(4,466)
Net income (loss) from continuing operations									179,584
Net income (loss) from discontinued operations, net of tax									0
Net income (loss)									179,584	(890,376)	112,720
Net income attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to the company									179,584	(890,376)	112,720
Other comprehensive income, net									0	0	0
Comprehensive income (loss) attributable to the company									179,584	(890,376)	112,720
NHIL
Operating revenues
Contract drilling services									0	0	0
Reimbursables and other									0	0	0
Total operating revenues									0	0	0
Operating costs and expenses
Contract drilling services									3,115	84,309	84,005
Reimbursables									0	0	0
Depreciation and amortization									0	0	0
General and administrative									1,588	40,082	38,167
Loss on impairment									0	0	0
Total operating costs and expenses									4,703	124,391	122,172
Operating income (loss)									(4,703)	(124,391)	(122,172)
Other income (expense)
Income (loss) of unconsolidated affiliates									188,809	(333,446)	936,429
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax									0
Interest expense, net of amounts capitalized									(430,580)	(228,423)	(224,894)
Gain on extinguishment of debt, net										17,814	0
Interest income and other, net									4,771	20,412	71,617
Income (loss) from continuing operations before income taxes									(241,703)	(648,034)	660,980
Income tax benefit (provision)									0	0	0
Net income (loss) from continuing operations									(241,703)
Net income (loss) from discontinued operations, net of tax									0
Net income (loss)									(241,703)	(648,034)	660,980
Net income attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to the company									(241,703)	(648,034)	660,980
Other comprehensive income, net									0	0	0
Comprehensive income (loss) attributable to the company									(241,703)	(648,034)	660,980
NDS6
Operating revenues
Contract drilling services									0	0	0
Reimbursables and other									0	0	0
Total operating revenues									0	0	0
Operating costs and expenses
Contract drilling services									0	0	0
Reimbursables									0	0	0
Depreciation and amortization									0	0	0
General and administrative									9	1	1
Loss on impairment									0	0	0
Total operating costs and expenses									9	1	1
Operating income (loss)									(9)	(1)	(1)
Other income (expense)
Income (loss) of unconsolidated affiliates									17,874	515,518	647,856
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax									0
Interest expense, net of amounts capitalized									(15,288)	(15,117)	(25,578)
Gain on extinguishment of debt, net										0	0
Interest income and other, net									224,772	15,058	5,165
Income (loss) from continuing operations before income taxes									227,349	515,458	627,442
Income tax benefit (provision)									0	0	0
Net income (loss) from continuing operations									227,349
Net income (loss) from discontinued operations, net of tax									0
Net income (loss)									227,349	515,458	627,442
Net income attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to the company									227,349	515,458	627,442
Other comprehensive income, net									0	0	0
Comprehensive income (loss) attributable to the company									227,349	515,458	627,442
Noble Corp
Operating revenues
Contract drilling services									1,207,026	2,242,200	3,261,610
Reimbursables and other									29,889	60,565	90,842
Total operating revenues									1,236,915	2,302,765	3,352,452
Operating costs and expenses
Contract drilling services									638,035	873,661	1,226,377
Reimbursables									18,435	45,499	70,276
Depreciation and amortization									543,119	611,013	633,244
General and administrative									41,087	46,045	55,435
Loss on impairment									121,639	1,458,749	418,298
Total operating costs and expenses									1,362,315	3,034,967	2,403,630
Operating income (loss)									(125,400)	(732,202)	948,822
Other income (expense)
Income (loss) of unconsolidated affiliates									0	0	0
Income (loss) of unconsolidated affiliates - discontinued operations, net of tax									0
Interest expense, net of amounts capitalized									(291,989)	(222,915)	(213,854)
Gain on extinguishment of debt, net									0	17,814	0
Interest income and other, net									5,285	133	34,664
Income (loss) from continuing operations before income taxes									(412,104)	(937,170)	769,632
Income tax benefit (provision)									(42,595)	109,163	(162,620)
Net income (loss) from continuing operations									(454,699)	(828,007)	607,012
Net income (loss) from discontinued operations, net of tax									2,967	0	0
Net income (loss)									(451,732)	(828,007)	607,012
Net income attributable to noncontrolling interests									(22,584)	(71,707)	(72,201)
Net income (loss) attributable to the company									(474,316)	(899,714)	534,811
Other comprehensive income, net									9,252	11,035	6,243
Comprehensive income (loss) attributable to the company									$ (465,064)	$ (888,679)	$ 541,054

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Condensed Consolidating Financial Information - Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net cash provided by operating activities	$ 453,938	$ 1,126,076	$ 1,764,907
Cash flows from investing activities
Proceeds from disposal of assets	2,382	24,808	4,614
Net cash used in investing activities	(155,588)	(669,931)	(432,537)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	0	0	(1,123,495)
Repayment of long-term debt	(300,000)	(1,049,338)	(350,000)
Issuance of senior notes	0	980,100	1,092,728
Tender offer premium	0	(24,649)	0
Debt issuance costs on senior notes and credit facility	(42)	(12,111)	(16,070)
Dividends paid to noncontrolling interests	(56,881)	(85,944)	(71,504)
Net cash used in financing activities	(361,243)	(242,668)	(888,635)
Net increase (decrease) in cash and cash equivalents	(62,893)	213,477	443,735
Cash and cash equivalents, beginning of period	725,722	512,245	68,510
Cash and cash equivalents, end of period	662,829	725,722	512,245
Consolidating Adjustments
Cash flows from operating activities
Net cash provided by operating activities	0	0	0
Cash flows from investing activities
Capital expenditures	0	0	0
Proceeds from disposal of assets	0	0	0
Notes receivable from affiliates			(733,722)
Net cash used in investing activities	0	0	(733,722)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities			0
Repayment of long-term debt	0	0	0
Issuance of senior notes		0	0
Tender offer premium		0
Debt issuance costs on senior notes and credit facility	0	0	0
Notes payable to affiliates			733,722
Dividends paid to noncontrolling interests	0	0	0
Contributions (distributions) from (to) parent company, net	0
Contributions (distributions) from (to) parent company, net		0	0
Advances (to) from affiliates	0	0	0
Net cash used in financing activities	0	0	733,722
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	0	0	0
Other Non-guarantor Subsidiaries of Noble
Cash flows from operating activities
Net cash provided by operating activities	335,672	1,404,359	2,105,575
Cash flows from investing activities
Capital expenditures	(154,348)	(201,754)	(320,557)
Proceeds from disposal of assets	2,336	24,808	4,614
Notes receivable from affiliates			0
Net cash used in investing activities	(152,012)	(176,946)	(315,943)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities			0
Repayment of long-term debt	0	0	0
Issuance of senior notes		0	0
Tender offer premium		0
Debt issuance costs on senior notes and credit facility	0	0	0
Notes payable to affiliates			(124,951)
Dividends paid to noncontrolling interests	(56,881)	(85,944)	(71,504)
Contributions (distributions) from (to) parent company, net	0
Contributions (distributions) from (to) parent company, net		0	0
Advances (to) from affiliates	(157,704)	(1,009,095)	(1,150,631)
Net cash used in financing activities	(214,585)	(1,095,039)	(1,347,086)
Net increase (decrease) in cash and cash equivalents	(30,925)	132,374	442,546
Cash and cash equivalents, beginning of period	640,441	508,067	65,521
Cash and cash equivalents, end of period	609,516	640,441	508,067
Noble - Cayman
Cash flows from operating activities
Net cash provided by operating activities	32,195	97,388	(31,562)
Cash flows from investing activities
Capital expenditures	0	0	0
Proceeds from disposal of assets	0	0	0
Notes receivable from affiliates			124,951
Net cash used in investing activities	0	0	124,951
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities			(1,123,495)
Repayment of long-term debt	0	0	0
Issuance of senior notes		0	0
Tender offer premium		0
Debt issuance costs on senior notes and credit facility	0	0	(6,450)
Notes payable to affiliates			(608,771)
Dividends paid to noncontrolling interests	0	0	0
Contributions (distributions) from (to) parent company, net	28,352
Contributions (distributions) from (to) parent company, net		(152,360)	(400,614)
Advances (to) from affiliates	(63,073)	55,882	2,047,563
Net cash used in financing activities	(34,721)	(96,478)	(91,767)
Net increase (decrease) in cash and cash equivalents	(2,526)	910	1,622
Cash and cash equivalents, beginning of period	2,537	1,627	5
Cash and cash equivalents, end of period	11	2,537	1,627
NHUS
Cash flows from operating activities
Net cash provided by operating activities	100,883	(150,735)	(53,686)
Cash flows from investing activities
Capital expenditures	0	0	0
Proceeds from disposal of assets	0	0	0
Notes receivable from affiliates			0
Net cash used in investing activities	0	0	0
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities			0
Repayment of long-term debt	0	0	0
Issuance of senior notes		0	0
Tender offer premium		0
Debt issuance costs on senior notes and credit facility	0	0	0
Notes payable to affiliates			0
Dividends paid to noncontrolling interests	0	0	0
Contributions (distributions) from (to) parent company, net	0
Contributions (distributions) from (to) parent company, net		0	0
Advances (to) from affiliates	(100,883)	150,735	53,686
Net cash used in financing activities	(100,883)	150,735	53,686
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	0	0	0
NDH
Cash flows from operating activities
Net cash provided by operating activities	209,898	149,431	15,207
Cash flows from investing activities
Capital expenditures	(3,622)	(492,985)	(116,594)
Proceeds from disposal of assets	46	0	0
Notes receivable from affiliates			0
Net cash used in investing activities	(3,576)	(492,985)	(116,594)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities			0
Repayment of long-term debt	0	0	0
Issuance of senior notes		0	0
Tender offer premium		0
Debt issuance costs on senior notes and credit facility	0	0	0
Notes payable to affiliates			0
Dividends paid to noncontrolling interests	0	0	0
Contributions (distributions) from (to) parent company, net	0
Contributions (distributions) from (to) parent company, net		0	0
Advances (to) from affiliates	(194,017)	352,308	103,234
Net cash used in financing activities	(194,017)	352,308	103,234
Net increase (decrease) in cash and cash equivalents	12,305	8,754	1,847
Cash and cash equivalents, beginning of period	10,855	2,101	254
Cash and cash equivalents, end of period	23,160	10,855	2,101
NHIL
Cash flows from operating activities
Net cash provided by operating activities	(403,391)	(344,112)	(267,735)
Cash flows from investing activities
Capital expenditures	0	0	0
Proceeds from disposal of assets	0	0	0
Notes receivable from affiliates			608,771
Net cash used in investing activities	0	0	608,771
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities			0
Repayment of long-term debt	(300,000)	(1,049,338)	(350,000)
Issuance of senior notes		980,100	1,092,728
Tender offer premium		(24,649)
Debt issuance costs on senior notes and credit facility	(42)	(12,111)	(9,620)
Notes payable to affiliates			0
Dividends paid to noncontrolling interests	0	0	0
Contributions (distributions) from (to) parent company, net	0
Contributions (distributions) from (to) parent company, net		0	0
Advances (to) from affiliates	732,757	450,110	(1,074,144)
Net cash used in financing activities	432,715	344,112	(341,036)
Net increase (decrease) in cash and cash equivalents	29,324	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	29,324	0	0
NDS6
Cash flows from operating activities
Net cash provided by operating activities	217,080	(60)	(20,292)
Cash flows from investing activities
Capital expenditures	0	0	0
Proceeds from disposal of assets	0	0	0
Notes receivable from affiliates			0
Net cash used in investing activities	0	0	0
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities			0
Repayment of long-term debt	0	0	0
Issuance of senior notes		0	0
Tender offer premium		0
Debt issuance costs on senior notes and credit facility	0	0	0
Notes payable to affiliates			0
Dividends paid to noncontrolling interests	0	0	0
Contributions (distributions) from (to) parent company, net	0
Contributions (distributions) from (to) parent company, net		0	0
Advances (to) from affiliates	(217,080)	60	20,292
Net cash used in financing activities	(217,080)	60	20,292
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	0	0	0
Noble Corp
Cash flows from operating activities
Net cash provided by operating activities	492,337	1,156,271	1,747,507
Cash flows from investing activities
Capital expenditures	(157,970)	(694,739)	(437,151)
Proceeds from disposal of assets	2,382	24,808	4,614
Notes receivable from affiliates			0
Net cash used in investing activities	(155,588)	(669,931)	(432,537)
Cash flows from financing activities
Net change in borrowings outstanding on bank credit facilities	0	0	(1,123,495)
Repayment of long-term debt	(300,000)	(1,049,338)	(350,000)
Issuance of senior notes	0	980,100	1,092,728
Tender offer premium	0	(24,649)	0
Debt issuance costs on senior notes and credit facility	(42)	(12,111)	(16,070)
Notes payable to affiliates			0
Dividends paid to noncontrolling interests	(56,881)	(85,944)	(71,504)
Contributions (distributions) from (to) parent company, net	28,352
Contributions (distributions) from (to) parent company, net		(152,360)	(400,614)
Advances (to) from affiliates	0	0	0
Net cash used in financing activities	(328,571)	(344,302)	(868,955)
Net increase (decrease) in cash and cash equivalents	8,178	142,038	446,015
Cash and cash equivalents, beginning of period	653,833	511,795	65,780
Cash and cash equivalents, end of period	$ 662,011	$ 653,833	$ 511,795

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Unaudited Interim Financial Data - Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Operating revenues	$ 329,585	$ 266,212	$ 278,142	$ 362,976	$ 410,156	$ 385,153	$ 894,783	$ 611,973	$ 1,236,915	$ 2,302,065	$ 3,352,252
Operating income (loss)	(109,656)	(55,588)	(43,875)	45,847	(1,384,912)	(2,208)	449,714	175,460	(163,272)	(761,946)	920,001
Net loss from continuing operations	(24,675)	(96,792)	(91,864)	(301,694)	$ (1,302,850)	$ (55,081)	$ 322,866	$ 105,485	(516,511)	(929,580)	511,000
Net loss from discontinued operations, net of tax	$ 0	$ 0	$ (1,486)	$ 0					$ (1,486)	$ 0	$ 0
Basic:
Income (loss) from continuing operations (usd per share)	$ (0.10)	$ (0.40)	$ (0.37)	$ (1.24)	$ (5.36)	$ (0.23)	$ 1.28	$ 0.42	$ (2.10)	$ (3.82)	$ 2.06
Net loss from discontinued operations, net of tax (usd per share)	0.00	0.00	(0.01)	0.00					(0.01)	0.00	0.00
Diluted:
Net income (loss) from continuing operations (usd per share)	(0.10)	(0.40)	(0.37)	(1.24)	$ (5.36)	$ (0.23)	$ 1.28	$ 0.42	(2.10)	(3.82)	2.06
Net loss from discontinued operations, net of tax (usd per share)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00					$ (0.01)	$ 0.00	$ 0.00

XML

Subsequent Events (Details) - USD ($)		1 Months Ended	12 Months Ended
	Jan. 31, 2018	Feb. 28, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 01, 2018	Jan. 03, 2018
Subsequent Event [Line Items]
Loss on extinguishment of debt			$ 0	$ 17,814,000	$ 0
NHIL
Subsequent Event [Line Items]
Loss on extinguishment of debt				$ 17,814,000	$ 0
7.50% Senior Notes due March 2019
Subsequent Event [Line Items]
Face value of senior notes			202,000,000
Line of Credit | 2015 Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities			2,400,000,000
Line of Credit | Letter of Credit | 2015 Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities			$ 500,000,000
Subsequent event | Line of Credit | 2017 Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities							$ 1,501,500,000
Subsequent event | Line of Credit | Letter of Credit | 2015 Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities							0
Subsequent event | Line of Credit | Letter of Credit | 2017 Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities							15,000,000
Subsequent event | Line of Credit | Revolving Credit Facility | 2015 Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities							300,000,000
Subsequent event | Line of Credit | Revolving Credit Facility | 2017 Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facilities							$ 1,501,500,000
Subsequent event | Senior notes
Subsequent Event [Line Items]
Purchase of senior notes						$ 754,200,000
Repurchase amount						$ 750,000,000
Loss on extinguishment of debt		$ (2,000,000)
Subsequent event | Senior notes | Senior Notes due 2026 | NHIL
Subsequent Event [Line Items]
Face value of senior notes	$ 750,000,000.0
Proceeds from issuance of debt after estimated expenses	737,000,000
Proceeds from issuance of notes	$ 750,000,000
Period of evaluation of notes after change of control	60 days
Required repurchase price upon certain terms	101.00%
Required percentage of assets to revenue required for subsidiary guarantors	85.00%
Required percentage of book value of material drilling equipment for subsidiary guarantors	85.00%
Subsequent event | Senior notes | Senior Notes due 2026 | NHIL | Prior to February 1, 2021 upon redemption
Subsequent Event [Line Items]
Redemption percentage on debt	100.00%
Subsequent event | Senior notes | Senior Notes due 2026 | NHIL | Prior to February 21, 2021 in event of equity offering
Subsequent Event [Line Items]
Redemption percentage on debt	40.00%
Subsequent event | Senior notes | 7.50% Senior Notes due March 2019
Subsequent Event [Line Items]
Purchase of senior notes		61,900,000
Repurchase amount		65,300,000
Loss on extinguishment of debt		$ (3,500,000)