10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the quarterly period ended: March 31, 2012

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: 000-53604

NOBLE CORPORATION

(Exact name of registrant as specified in its charter)

Switzerland	98-0619597
(State or other jurisdiction of incorporation or organization)	(I.R.S. employer identification number)
Dorfstrasse 19A, Baar, Switzerland	6340
(Address of principal executive offices)	(Zip Code)

Registrant’s Telephone Number, Including Area Code: 41 (41) 761-65-55

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

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  x    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 (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

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

Noble-Swiss:	Large accelerated filer x	Accelerated filer ¨	Non-accelerated filer ¨	Smaller reporting company ¨
Noble-Cayman:	Large accelerated filer ¨	Accelerated filer ¨	Non-accelerated filer x	Smaller reporting company ¨

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

Number of shares outstanding and trading at April 30, 2012: Noble Corporation (Switzerland) — 252,387,216

Number of shares outstanding at April 30, 2012: Noble Corporation (Cayman Islands) — 261,245,693

Noble Corporation, a Cayman Islands company and a wholly owned subsidiary of Noble Corporation, a Swiss corporation, meets the conditions set forth in General Instructions H(1) (a) and (b) to Form 10-Q and is therefore filing this Form 10-Q with the reduced disclosure format contemplated by paragraphs (b) and (c) of General Instruction H(2) of Form 10-Q.

TABLE OF CONTENTS

	Page
PART I FINANCIAL INFORMATION
Item 1 Financial Statements
Noble Corporation (Noble-Swiss) Financial Statements:
Consolidated Balance Sheet as of March 31, 2012 and December 31, 2011		3
Consolidated Statement of Income for the three months ended March 31, 2012 and 2011		4
Consolidated Statement of Comprehensive Income for the three months ended March 31, 2012 and 2011		5
Consolidated Statement of Cash Flows for the three months ended March 31, 2012 and 2011		6
Consolidated Statement of Equity for the three months ended March 31, 2012 and 2011		7
Noble Corporation (Noble-Cayman) Financial Statements:
Consolidated Balance Sheet as of March 31, 2012 and December 31, 2011		8
Consolidated Statement of Income for the three months ended March 31, 2012 and 2011		9
Consolidated Statement of Comprehensive Income for the three months ended March 31, 2012 and 2011		10
Consolidated Statement of Cash Flows for the three months ended March 31, 2012 and 2011		11
Consolidated Statement of Equity for the three months ended March 31, 2012 and 2011		12
Notes to Combined Consolidated Financial Statements		13
Item 2 Management’s Discussion and Analysis of Financial Condition and Results of Operations		34
Item 3 Quantitative and Qualitative Disclosures About Market Risk		45
Item 4 Controls and Procedures		47
PART II OTHER INFORMATION
Item 1 Legal Proceedings		47
Item 2 Unregistered Sales of Equity Securities and Use of Proceeds		47
Item 6 Exhibits		47
SIGNATURES		48
Index to Exhibits		49

This combined Quarterly Report on Form 10-Q is separately filed by Noble Corporation, a Swiss corporation (“Noble-Swiss”), and Noble Corporation, a Cayman Islands company (“Noble-Cayman”). Information in this filing relating to Noble-Cayman is filed by Noble-Swiss and separately by Noble-Cayman on its own behalf. Noble-Cayman makes no representation as to information relating to Noble-Swiss (except as it may relate to Noble-Cayman) or any other affiliate or subsidiary of Noble-Swiss. Since Noble-Cayman meets the conditions specified in General Instructions H(1)(a) and (b) to Form 10-Q, it is permitted to use the reduced disclosure format for wholly owned subsidiaries of reporting companies. Accordingly, Noble-Cayman has omitted from this report the information called for by Item 3 (Quantitative and Qualitative Disclosures about Market Risk) of Part I of Form 10-Q and the following items of Part II of Form 10-Q: Item 2 (Unregistered Sales of Equity Securities and Use of Proceeds) and Item 3 (Defaults upon Senior Securities).

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

2

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEET

(In thousands)

(Unaudited)

	March 31,			December 31,
	2012			2011
ASSETS
Current assets
Cash and cash equivalents	$	208,840		$	239,196
Accounts receivable		738,835			587,163
Taxes receivable		95,308			75,284
Prepaid expenses		88,499			35,796
Other current assets		123,191			122,173
Total current assets		1,254,673			1,059,612
Property and equipment, at cost		15,371,823			15,037,112
Accumulated depreciation		(3,282,511	)		(3,139,645	)
Property and equipment, net		12,089,312			11,897,467
Other assets		551,216			538,080
Total assets	$	13,895,201		$	13,495,159
LIABILITIES AND EQUITY
Current liabilities
Accounts payable	$	335,276		$	436,006
Accrued payroll and related costs		111,251			117,907
Interest payable		28,540			54,419
Taxes payable		97,179			94,920
Other current liabilities		108,911			123,928
Total current liabilities		681,157			827,180
Long-term debt		4,444,161			4,071,964
Deferred income taxes		240,341			242,791
Other liabilities		306,175			255,372
Total liabilities		5,671,834			5,397,307
Commitments and contingencies
Shareholders’ equity
Shares; 252,730 and 252,639 shares outstanding		737,633			766,595
Treasury shares, at cost; 463 and 287 shares		(17,004	)		(10,553	)
Additional paid-in capital		52,180			48,356
Retained earnings		6,796,619			6,676,444
Accumulated other comprehensive loss		(70,560	)		(74,321	)
Total shareholders’ equity		7,498,868			7,406,521
Noncontrolling interests		724,499			691,331
Total equity		8,223,367			8,097,852
Total liabilities and equity	$	13,895,201		$	13,495,159

See accompanying notes to the unaudited consolidated financial statements.

3

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF INCOME

(In thousands, except per share amounts)

(Unaudited)

	Three Months Ended
	March 31,
	2012			2011
Operating revenues
Contract drilling services	$	746,310		$	542,605
Reimbursables		35,141			22,291
Labor contract drilling services		16,008			13,547
Other		231			445
		797,690			578,888
Operating costs and expenses
Contract drilling services		420,011			306,363
Reimbursables		30,601			17,103
Labor contract drilling services		9,232			8,523
Depreciation and amortization		171,077			158,122
Selling, general and administrative		23,126			23,715
Gain on contract extinguishments, net		—			(21,202	)
		654,047			492,624
Operating income		143,643			86,264
Other income (expense)
Interest expense, net of amount capitalized		(10,496	)		(19,041	)
Interest income and other, net		1,785			2,592
Income before income taxes		134,932			69,815
Income tax provision		(21,589	)		(15,359	)
Net income		113,343			54,456
Net loss attributable to noncontrolling interests		6,832			39
Net income attributable to Noble Corporation	$	120,175		$	54,495
Net income per share
Basic	$	0.47		$	0.22
Diluted	$	0.47		$	0.21

See accompanying notes to the unaudited consolidated financial statements.

4

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2012			2011
Net income	$	113,343		$	54,456
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments		(41	)		3,040
Gain on foreign currency forward contracts		2,417			162
Loss on interest rate swaps		—			(366	)
Amortization of deferred pension plan amounts (net of tax provision of $720 in 2012 and $353 in 2011)		1,385			653
Other comprehensive income, net		3,761			3,489
Net comprehensive income attributable to noncontrolling interests		6,832			40
Comprehensive income attributable to Noble Corporation	$	123,936		$	57,985

See accompanying notes to the unaudited consolidated financial statements.

5

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF CASH FLOWS

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2012			2011
Cash flows from operating activities
Net income	$	113,343		$	54,456
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization		171,077			158,122
Gain on contract extinguishments, net		—			(21,202	)
Deferred income taxes		(4,075	)		2,819
Amortization of share-based compensation		8,753			8,271
Net change in other assets and liabilities		(185,390	)		(115,692	)
Net cash from operating activities		103,708			86,774
Cash flows from investing activities
Capital expenditures		(367,965	)		(614,324	)
Change in accrued capital expenditures		(127,393	)		(471	)
Refund from contract extinguishments		—			18,642
Net cash from investing activities		(495,358	)		(596,153	)
Cash flows from financing activities
Borrowings on bank credit facilities		365,000			200,000
Repayments on bank credit facilities		(1,190,000	)		(240,000	)
Proceeds from issuance of senior notes, net of debt issuance costs		1,186,636			1,087,833
Contributions from joint venture partners		40,000			396,000
Payments of joint venture debt		—			(693,494	)
Settlement of interest rate swaps		—			(29,032	)
Par value reduction payments		(36,370	)		(34,920	)
Financing costs on credit facilities		—			(2,835	)
Proceeds from employee stock transactions		2,479			2,337
Repurchases of employee shares surrendered for taxes		(6,451	)		(5,700	)
Net cash from financing activities		361,294			680,189
Net change in cash and cash equivalents		(30,356	)		170,810
Cash and cash equivalents, beginning of period		239,196			337,871
Cash and cash equivalents, end of period	$	208,840		$	508,681

See accompanying notes to the unaudited consolidated financial statements.

6

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF EQUITY

(In thousands)

(Unaudited)

	Shares						Additional Paid-in			Retained		Treasury			Accumulated Other Comprehensive			Noncontrolling			Total
	Balance			Par Value			Capital			Earnings		Shares			Loss			Interests			Equity
Balance at December 31, 2010		262,415		$	917,684		$	39,006		$	6,630,500	$	(373,967	)	$	(50,220	)	$	124,631		$	7,287,634
Employee related equity activity
Amortization of share-based compensation		—			—			8,271			—		—			—			—			8,271
Issuance of share-based compensation shares		176			598			(598	)		—		—			—			—			—
Exercise of stock options		167			566			2,890			—		—			—			—			3,456
Tax benefit of stock options exercised		—			—			(1,119	)		—		—			—			—			(1,119	)
Restricted shares forfeited or repurchased for taxes		(312	)		(1,074	)		1,074			—		(5,700	)		—			—			(5,700	)
Net income		—			—			—			54,495		—			—			(39	)		54,456
Par value reduction payments		—			(30,343	)		(4,577	)		—		—			—			—			(34,920	)
Equity contribution by joint venture partner		—			—			—			—		—			—			361,000			361,000
Other comprehensive income, net		—			—			—			—		—			3,489			(1	)		3,488
Balance at March 31, 2011		262,446		$	887,431		$	44,947		$	6,684,995	$	(379,667	)	$	(46,731	)	$	485,591		$	7,676,566
Balance at December 31, 2011		252,639		$	766,595		$	48,356		$	6,676,444	$	(10,553	)	$	(74,321	)	$	691,331		$	8,097,852
Employee related equity activity
Amortization of share-based compensation		—			—			8,753			—		—			—			—			8,753
Issuance of share-based compensation shares		352			1,067			(1,067	)		—		—			—			—			—
Exercise of stock options		113			329			2,292			—		—			—			—			2,621
Tax benefit of stock options exercised		—			—			(142	)		—		—			—			—			(142	)
Restricted shares forfeited or repurchased for taxes		(374	)		(1,138	)		1,138			—		(6,451	)		—			—			(6,451	)
Net income		—			—			—			120,175		—			—			(6,832	)		113,343
Equity contribution by joint venture partner		—			—			—			—		—			—			40,000			40,000
Par value reduction payments		—			(29,220	)		(7,150	)		—		—			—			—			(36,370	)
Other comprehensive income, net		—			—			—			—		—			3,761			—			3,761
Balance at March 31, 2012		252,730		$	737,633		$	52,180		$	6,796,619	$	(17,004	)	$	(70,560	)	$	724,499		$	8,223,367

See accompanying notes to the unaudited consolidated financial statements.

7

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEET

(In thousands)

(Unaudited)

	March 31,			December 31,
	2012			2011
ASSETS
Current assets
Cash and cash equivalents	$	201,215		$	235,056
Accounts receivable		738,835			587,163
Taxes receivable		95,122			75,284
Prepaid expenses		86,241			33,105
Other current assets		122,297			120,109
Total current assets		1,243,710			1,050,717
Property and equipment, at cost		15,336,998			15,002,928
Accumulated depreciation		(3,276,762	)		(3,134,401	)
Property and equipment, net		12,060,236			11,868,527
Other assets		551,298			538,161
Total assets	$	13,855,244		$	13,457,405
LIABILITIES AND EQUITY
Current liabilities
Accounts payable	$	334,289		$	435,729
Accrued payroll and related costs		102,091			108,908
Interest payable		28,540			54,419
Taxes payable		93,200			91,190
Other current liabilities		108,890			123,399
Total current liabilities		667,010			813,645
Long-term debt		4,444,161			4,071,964
Deferred income taxes		240,341			242,791
Other liabilities		306,175			255,372
Total liabilities		5,657,687			5,383,772
Commitments and contingencies
Shareholder equity
Ordinary shares; 261,246 shares outstanding		26,125			26,125
Capital in excess of par value		455,686			450,616
Retained earnings		7,061,807			6,979,882
Accumulated other comprehensive loss		(70,560	)		(74,321	)
Total shareholder equity		7,473,058			7,382,302
Noncontrolling interests		724,499			691,331
Total equity		8,197,557			8,073,633
Total liabilities and equity	$	13,855,244		$	13,457,405

See accompanying notes to the unaudited consolidated financial statements.

8

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF INCOME

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2012			2011
Operating revenues
Contract drilling services	$	746,310		$	542,605
Reimbursables		35,141			22,291
Labor contract drilling services		16,008			13,547
Other		231			445
		797,690			578,888
Operating costs and expenses
Contract drilling services		415,146			300,832
Reimbursables		30,601			17,103
Labor contract drilling services		9,232			8,523
Depreciation and amortization		170,573			157,655
Selling, general and administrative		14,010			16,531
Gain on contract extinguishments, net		—			(21,202	)
		639,562			479,442
Operating income		158,128			99,446
Other income (expense)
Interest expense, net of amount capitalized		(10,496	)		(19,041	)
Interest income and other, net		1,399			2,241
Income before income taxes		149,031			82,646
Income tax provision		(21,211	)		(15,025	)
Net income		127,820			67,621
Net loss attributable to noncontrolling interests		6,832			39
Net income attributable to Noble Corporation	$	134,652		$	67,660

See accompanying notes to the unaudited consolidated financial statements.

9

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2012			2011
Net income	$	127,820		$	67,621
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments		(41	)		3,040
Gain on foreign currency forward contracts		2,417			162
Loss on interest rate swaps		—			(366	)
Amortization of deferred pension plan amounts (net of tax provision of $720 in 2012 and $353 in 2011)		1,385			653
Other comprehensive income, net		3,761			3,489
Net comprehensive income attributable to noncontrolling interests		6,832			40
Comprehensive income attributable to Noble Corporation	$	138,413		$	71,150

See accompanying notes to the unaudited consolidated financial statements.

10

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF CASH FLOWS

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2012			2011
Cash flows from operating activities
Net income	$	127,820		$	67,621
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization		170,573			157,655
Gain on contract extinguishments, net		—			(21,202	)
Deferred income taxes		(4,075	)		2,819
Capital contribution by parent—share-based compensation		5,070			5,151
Net change in other assets and liabilities		(187,420	)		(118,545	)
Net cash from operating activities		111,968			93,499
Cash flows from investing activities
Capital expenditures		(367,325	)		(609,601	)
Change in accrued capital expenditures		(127,393	)		(471	)
Refund from contract extinguishments		—			18,642
Net cash from investing activities		(494,718	)		(591,430	)
Cash flows from financing activities
Borrowings on bank credit facilities		365,000			200,000
Repayments on bank credit facilities		(1,190,000	)		(240,000	)
Proceeds from issuance of senior notes, net of debt issuance costs		1,186,636			1,087,833
Contributions from joint venture partners		40,000			396,000
Payments of joint venture debt		—			(693,494	)
Settlement of interest rate swaps		—			(29,032	)
Financing costs on credit facilities		—			(2,835	)
Distributions to parent company, net		(52,727	)		(52,889	)
Net cash from financing activities		348,909			665,583
Net change in cash and cash equivalents		(33,841	)		167,652
Cash and cash equivalents, beginning of period		235,056			333,399
Cash and cash equivalents, end of period	$	201,215		$	501,051

See accompanying notes to the unaudited consolidated financial statements.

11

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF EQUITY

(In thousands)

(Unaudited)

	Shares				Capital in Excess of		Retained			Accumulated Other Comprehensive			Noncontrolling			Total
	Balance		Par Value		Par Value		Earnings			Loss			Interests			Equity
Balance at December 31, 2010		261,246	$	26,125	$	416,232	$	6,743,887		$	(50,220	)	$	124,631		$	7,260,655
Net income		—		—		—		67,660			—			(39	)		67,621
Capital contributions by parent— share-based compensation		—		—		5,151		—			—			—			5,151
Distributions to parent		—		—		—		(52,889	)		—			—			(52,889	)
Noncontrolling interest contributions		—		—		—		—			—			361,000			361,000
Other comprehensive income (loss), net		—		—		—		—			3,489			(1	)		3,488
Balance at March 31, 2011		261,246	$	26,125	$	421,383	$	6,758,658		$	(46,731	)	$	485,591		$	7,645,026
Balance at December 31, 2011		261,246	$	26,125	$	450,616	$	6,979,882		$	(74,321	)	$	691,331		$	8,073,633
Net income		—		—		—		134,652			—			(6,832	)		127,820
Capital contributions by parent— share-based compensation		—		—		5,070		—			—			—			5,070
Distributions to parent		—		—		—		(52,727	)		—			—			(52,727	)
Noncontrolling interest contributions		—		—		—		—			—			40,000			40,000
Other comprehensive income (loss), net		—		—		—		—			3,761			—			3,761
Balance at March 31, 2012		261,246	$	26,125	$	455,686	$	7,061,807		$	(70,560	)	$	724,499		$	8,197,557

See accompanying notes to the unaudited consolidated financial statements.

12

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Note 1 — Organization and Basis of Presentation

Noble Corporation, a Swiss corporation (“Noble-Swiss”), is a leading provider of offshore contract drilling services for the oil and gas industry. Our fleet of 79 mobile offshore drilling units consists of 14 semisubmersibles, 14 drillships, 49 jackups and two submersibles. Additionally, we have one floating production storage and offloading unit. Our fleet includes 11 units under construction as follows:

• five dynamically positioned, ultra-deepwater, harsh environment drillships and

• six high-specification heavy-duty, harsh environment jackup rigs.

Our global fleet is currently located in the following areas: the U.S. Gulf of Mexico, Mexico, Brazil, the North Sea, the Mediterranean, West Africa, the Middle East, India and the Asian Pacific. 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 a direct, wholly-owned subsidiary of Noble-Swiss, our publicly-traded parent company. Noble-Swiss’ principal asset is all of the shares of Noble-Cayman. Noble-Cayman has no public equity outstanding. The consolidated financial statements of Noble-Swiss include the accounts of Noble-Cayman, and Noble-Swiss conducts substantially all of its business through Noble-Cayman and its subsidiaries.

The accompanying unaudited consolidated financial statements of Noble-Swiss and Noble-Cayman have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) as they pertain to Form 10-Q. Accordingly, certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. The unaudited financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the financial position and results of operations for the interim periods, on a basis consistent with the annual audited consolidated financial statements. All such adjustments are of a recurring nature. The December 31, 2011 Consolidated Balance Sheets presented herein are derived from the December 31, 2011 audited consolidated financial statements. These interim financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2011, filed by both Noble-Swiss and Noble-Cayman. The results of operations for interim periods are not necessarily indicative of the results to be expected for the full year.

Certain amounts in prior periods have been reclassified to conform to the current year presentation.

Note 2 — Consolidated Joint Ventures

We own a 50 percent interest in two joint ventures, each with a subsidiary of Royal Dutch Shell, PLC (“Shell”), for the construction and operation of our two Bully-class drillships. Since these entities’ equity at risk is insufficient to permit them to carry on their activities without additional financial support, they each meet the criteria for a variable interest entity. We have determined that we are the primary beneficiary for accounting purposes. 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.

In April 2011, the Bully joint venture partners entered into capital contribution agreements whereby capital calls up to a total of $360 million can be made for funds needed to complete the construction of the drillships. All contributions under these agreements were made during 2011 and the first quarter of 2012. No amounts remain available under these agreements.

At March 31, 2012, the combined carrying amount of the drillships was $1.4 billion, which was primarily funded through partner equity contributions.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Note 3 — Share Data

Share capital

The following is a detail of Noble-Swiss’ share capital as of March 31, 2012 and December 31, 2011:

	March 31, 2012		December 31, 2011
Shares outstanding and trading		252,267		252,352
Treasury shares		463		287
Total shares outstanding		252,730		252,639
Treasury shares held for share-based compensation plans		13,420		13,511
Total shares authorized for issuance		266,150		266,150
Par value per share (in Swiss Francs)		3.28		3.41

Shares authorized for issuance by Noble-Swiss at March 31, 2012 totaled 266.2 million shares and include 0.5 million shares held in treasury and 13.4 million treasury shares held by a wholly-owned subsidiary. Repurchased treasury shares are recorded at cost, and include shares repurchased pursuant to our approved share repurchase program discussed below and shares surrendered by employees for taxes payable upon the vesting of restricted stock.

Share repurchases are made pursuant to the share repurchase program that our Board of Directors authorized and adopted. All shares repurchased under our share repurchase program are held in treasury. The number of shares that we may hold in treasury is limited under Swiss law. At March 31, 2012, 6.8 million shares remained available for repurchase under previous authorization by the Board of Directors. No shares were repurchased under this authorization during the three months ended March 31, 2012.

Our Board of Directors may further increase Noble-Swiss’ share capital through the issuance of up to 133.1 million authorized registered shares without obtaining shareholder approval. The issuance of these authorized registered shares is subject to certain conditions regarding their use.

In April 2012, our shareholders approved the payment of a dividend funded from capital contribution reserve in a total amount equal to $0.52 per share to be paid in four equal installments scheduled for August 2012, November 2012, February 2013 and May 2013. These dividends will require us to make total cash payments of approximately $66 million in 2012, based on the number of shares currently outstanding. In connection with this approval, during the second quarter of 2012, we will record a payable of approximately $133 million, which represents this obligation to shareholders. Any additional issuances of shares would further increase this obligation.

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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

The following table sets forth the computation of basic and diluted earnings per share for Noble-Swiss:

	Three months ended March 31,
	2012			2011
Allocation of net income
Basic
Net income attributable to Noble Corporation	$	120,175		$	54,495
Earnings allocated to unvested share-based payment awards		(1,126	)		(509	)
Net income to common shareholders—basic	$	119,049		$	53,986
Diluted
Net income attributable to Noble Corporation	$	120,175		$	54,495
Earnings allocated to unvested share-based payment awards		(1,125	)		(509	)
Net income to common shareholders—diluted	$	119,050		$	53,986
Weighted average shares outstanding—basic		251,971			251,026
Incremental shares issuable from assumed exercise of stock options		491			775
Weighted average shares outstanding—diluted		252,462			251,801
Weighted average unvested share-based payment awards		2,407			2,419
Earnings per share
Basic	$	0.47		$	0.22
Diluted	$	0.47		$	0.21

Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. At March 31, 2012, stock options totaling approximately 1.2 million were excluded from the diluted earnings per share as they were not dilutive as compared to 0.7 million at March 31, 2011.

Note 4 — Property and Equipment

Property and equipment, at cost, as of March 31, 2012 and December 31, 2011 consisted of the following:

	March 31, 2012		December 31, 2011
Drilling equipment and facilities	$	11,277,790	$	10,471,877
Construction in progress		3,893,858		4,367,750
Other		200,175		197,485
	$	15,371,823	$	15,037,112

Capital expenditures, including capitalized interest, totaled $368 million and $614 million for the three months ended March 31, 2012 and 2011, respectively. Capital expenditures for 2012 consisted of the following:

• $133 million for newbuild construction;

• $147 million for major projects, including $25 million in subsea related expenditures and $25 million to upgrade two drillships currently operating in Brazil;

• $47 million for other capitalized expenditures, including major maintenance and regulatory expenditures which generally have useful lives ranging from 3 to 5 years; and

• $41 million in capitalized interest.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Interest is capitalized on construction-in-progress at the weighted average cost of debt outstanding during the period of construction. Capitalized interest was $41 million and $27 million for the three months ended March 31, 2012 and 2011, respectively.

Note 5 — Gain on contract extinguishments, net

In January 2011, we announced the signing of a Memorandum of Understanding (“MOU”) with Petroleo Brasileiro S.A. (“Petrobras”) regarding operations in Brazil. Under the terms of the MOU, we agreed to substitute the Noble Phoenix, then under contract with Shell in Southeast Asia, for the Noble Muravlenko. In connection with the cancellation of the contract on the Noble Phoenix, we recognized a non-cash gain of approximately $52.5 million during the first quarter of 2011, which represented the unamortized fair value of the in-place contract at acquisition. As a result of the substitution, we reached a decision not to proceed with the previously announced reliability upgrade to the Noble Muravlenko that was scheduled to take place in 2013. As a result, we incurred a non-cash charge of approximately $32.6 million related to the termination of outstanding shipyard contracts. We expect the actual substitution to take place in the third quarter of 2012 after the Noble Phoenix completes its shipyard work.

In February 2011, the outstanding balances of the Bully joint venture credit facilities, which totaled $693 million, were repaid in full and the credit facilities terminated using a portion of the proceeds from our February 2011 debt offering and equity contributions from our joint venture partner. In addition, the related interest rate swaps were settled and terminated concurrent with the repayment and termination of the credit facilities. As a result of these transactions, we recognized a gain of approximately $1.3 million during the first quarter of 2011.

Note 6 — Receivables from Customers

As discussed in Note 12, in May 2010, Anadarko Petroleum Corporation (“Anadarko”) sent a letter asserting that the initial attempted deepwater drilling moratorium in the U.S. Gulf of Mexico was an event of force majeure under the drilling contract for the Noble Amos Runner. In June 2010, Anadarko filed a declaratory judgment action in Federal District Court in Houston, Texas seeking to have the court declare that a force majeure condition had occurred and that the drilling contract was terminated by virtue of the initial proclaimed moratorium. We disagree that a force majeure event occurred and that Anadarko had the right to terminate the contract. In August 2010, we filed a counterclaim seeking damages from Anadarko for breach of contract. This matter is currently set for trial during the second quarter of 2012. Anadarko has also attempted to offset revenue that we had billed for services performed prior to their termination of the contract against other amounts it claims are owed relating to costs Anadarko incurred after Hurricane Ike, and that are the subject of a separate dispute (the “Hurricane Ike Case”). At March 31, 2012, we had accounts receivable of approximately $13 million related to this attempted offset. We do not believe Anadarko has a basis to offset these invoiced amounts. While we will continue to litigate the matter to full resolution, we can make no assurances as to the collection of these amounts or the outcome of this dispute.

In June 2010, a subsidiary of Frontier, which we acquired in July 2010, entered into a charter contract with a subsidiary of BP PLC (“BP”) for the Seillean with a term of a minimum of 100 days. The unit went on hire on July 23, 2010. In October 2010, BP initiated an arbitration proceeding against us claiming the contract was void ab initio, or never existed, due to a fundamental breach and has made other claims and is demanding that we reimburse the amounts already paid to us under the charter. We believe BP owes us the amounts due under the charter. The charter contains a “hell or high water” provision requiring payment, and we believe we have satisfied our obligations under the charter. Outstanding receivables related to this charter totaled $35 million as of March 31, 2012. These receivables have been classified as long-term and are included in “Other assets” on our Consolidated Balance Sheet at March 31, 2012. We believe that if BP were to be successful in claiming the contract void ab initio, we would have an indemnity claim against the former shareholders of Frontier. We have put the former owners of Frontier on notice of this potential claim. We can make no assurances as to the outcome of this dispute.

At March 31, 2012, we had receivables of approximately $14 million related to the Noble Max Smith, which are being disputed by our customer, Pemex Exploracion y Produccion (“Pemex”). These receivables have been classified as long-term and are included in “Other assets” on our Consolidated Balance Sheet at March 31, 2012. The disputed amount relates to lost revenues due from Pemex for downtime that occurred after our rig was damaged when one of Pemex’s supply boats collided with our rig. In January 2012, we filed a lawsuit against Pemex in Mexican court seeking recovery of these amounts. While we believe we are entitled to the disputed amounts, we can make no assurances as to the outcome of this dispute.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Note 7 — Debt

Total debt consisted of the following at March 31, 2012 and December 31, 2011:

	March 31, 2012		December 31, 2011
Wholly-owned debt instruments:
5.875% Senior Notes due 2013	$	299,957	$	299,949
7.375% Senior Notes due 2014		249,684		249,647
3.45% Senior Notes due 2015		350,000		350,000
3.05% Senior Notes due 2016		299,941		299,938
2.50% Senior Notes due 2017		299,827		—
7.50% Senior Notes due 2019		201,695		201,695
4.90% Senior Notes due 2020		498,811		498,783
4.625% Senior Notes due 2021		399,492		399,480
3.95% Senior Notes due 2022		399,035		—
6.20% Senior Notes due 2040		399,891		399,890
6.05% Senior Notes due 2041		397,590		397,582
5.25% Senior Notes due 2042		498,238		—
Credit facilities		150,000		975,000
Total long-term debt	$	4,444,161	$	4,071,964

We have two separate revolving credit facilities in place which provide us with a total borrowing capacity of approximately $1.18 billion. One credit facility, which has a capacity of $575 million, matures in 2013, and the other facility, which has a capacity of $600 million, matures in 2015 (together referred to as the “Credit Facilities”). The covenants and events of default under the Credit Facilities are substantially similar, and each facility contains a covenant that limits our ratio of debt to total tangible capitalization, as defined in the Credit Facilities, to 0.60. At March 31, 2012, our ratio of debt to total tangible capitalization was less than 0.36 for the Credit Facilities. We were in compliance with all covenants under the Credit Facilities as of March 31, 2012.

The Credit Facilities provide us with the ability to issue up to $300 million in letters of credit in the aggregate. While the issuance of letters of credit does not increase our borrowings outstanding under the Credit Facilities, it does reduce the amount available. At March 31, 2012, we had no letters of credit outstanding under the Credit Facilities.

In February 2012, we issued, through our indirect wholly-owned subsidiary, Noble Holding International Limited (“NHIL”), $1.2 billion aggregate principal amount of senior notes in three separate tranches, with $300 million of 2.50% Senior Notes due 2017, $400 million of 3.95% Senior Notes due 2022, and $500 million of 5.25% Senior Notes due 2042. The weighted average coupon of all three tranches is 4.13%. The net proceeds of approximately $1.19 billion, after expenses, were primarily used to repay the then outstanding balance on our Credit Facilities.

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 or assuming certain liens and sale and lease-back transactions. At March 31, 2012, we were in compliance with all our debt covenants. We continually monitor compliance with the covenants under our Credit Facilities and senior notes and, based on our expectations for 2012, expect to remain in compliance during the year.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Fair Value of Debt

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). The following table presents the estimated fair value of our long-term debt as of March 31, 2012 and December 31, 2011.

	March 31, 2012				December 31, 2011
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Wholly-owned debt instruments
5.875% Senior Notes due 2013	$	299,957	$	316,003	$	299,949	$	317,586
7.375% Senior Notes due 2014		249,684		277,685		249,647		278,966
3.45% Senior Notes due 2015		350,000		367,520		350,000		363,571
3.05% Senior Notes due 2016		299,941		308,804		299,938		306,057
2.50% Senior Notes due 2017		299,827		301,653		—		—
7.50% Senior Notes due 2019		201,695		246,435		201,695		248,623
4.90% Senior Notes due 2020		498,811		536,850		498,783		531,437
4.625% Senior Notes due 2021		399,492		424,808		399,480		416,847
3.95% Senior Notes due 2022		399,035		400,535		—		—
6.20% Senior Notes due 2040		399,891		440,619		399,890		450,017
6.05% Senior Notes due 2041		397,590		433,771		397,582		443,308
5.25% Senior Notes due 2042		498,238		494,298		—		—
Credit facilities		150,000		150,000		975,000		975,000
Total long-term debt	$	4,444,161	$	4,698,981	$	4,071,964	$	4,331,412

Note 8 — Income Taxes

At December 31, 2011, the reserves for uncertain tax positions totaled $118 million (net of related tax benefits of $8 million). At March 31, 2012, the reserves for uncertain tax positions totaled $125 million (net of related tax benefits of $9 million). If the March 31, 2012 reserves are not realized, the provision for income taxes would be reduced by $125 million.

It is possible that our existing liabilities related to our reserve for uncertain tax positions may increase or decrease in the next twelve 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.

Note 9 — Employee Benefit Plans

Pension costs include the following components:

	Three Months Ended March 31,
	2012						2011
	Non-U.S.			U.S.			Non-U.S.			U.S.
Service cost	$	1,123		$	2,431		$	1,093		$	2,152
Interest cost		1,358			2,196			1,383			2,143
Return on plan assets		(1,346	)		(2,793	)		(1,403	)		(2,768	)
Amortization of prior service cost		—			57			—			56
Amortization of transition obligation		—			—			18			—
Recognized net actuarial loss		200			1,885			120			844
Net pension expense	$	1,335		$	3,776		$	1,211		$	2,427

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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 three months ended March 31, 2012 and 2011, we made contributions to our pension plans totaling $4 million and $2 million, respectively. We expect the funding to our non-U.S. and U.S. plans in 2012, subject to applicable law, to be approximately $19 million.

Note 10 — 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. During the three months ended March 31, 2011, we maintained certain foreign currency forward contracts that did not qualify under the Financial Accounting Standards Board (“FASB”) standards for hedge accounting treatment and therefore, changes in fair values were recognized as either income or loss in our consolidated income statement.

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. For interest rate swaps, we evaluate all material terms between the swap and the underlying debt obligation, known in FASB standards as the “long-haul method.” Any change in fair value resulting from ineffectiveness is recognized immediately in earnings.

Cash Flow Hedges

Our North Sea and Brazil operations have a significant amount of their cash operating expenses payable in local currencies. To limit the potential risk of currency fluctuations, we typically maintain short-term forward contracts settling monthly in their respective local currencies. The forward contract settlements in the remainder of 2012 represent approximately 10 percent of these forecasted local currency requirements. The notional amount of the forward contracts outstanding, expressed in U.S. Dollars, was approximately $13 million at March 31, 2012. Total unrealized loss related to these forward contracts was $0.6 million as of March 31, 2012 and was recorded as part of “Accumulated other comprehensive loss” (“AOCL”).

The balance of the net unrealized gain/(loss) related to our cash flow hedges included in AOCL and related activity is as follows:

	Three Months Ended
	March 31,
	2012			2011
Net unrealized gain/(loss) at beginning of period	$	(3,061	)	$	1,970
Activity during period:
Settlement of foreign currency forward contracts during the period		2,118			(1,152	)
Settlement of interest rate swaps during the period		—			(366	)
Net unrealized gain on outstanding foreign currency forward contracts		299			1,314
Net unrealized gain/(loss) at end of period	$	(644	)	$	1,766

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Financial Statement Presentation

The following tables, together with Note 11, summarize the financial statement presentation and fair value of our derivative positions as of March 31, 2012 and December 31, 2011:

			Estimated fair value
	Balance  sheet classification		March 31, 2012		December 31, 2011
Liability derivatives
Cash flow hedges
Short-term foreign currency forward contracts		Other current liabilities	$	644	$	3,061

To supplement the fair value disclosures in Note 11, the following summarizes the recognized gains and losses of cash flow hedges and non-designated derivatives through AOCL or through “other income” for the three months ended March 31, 2012 and 2011:

	Gain/(loss) recognized through AOCL				Gain/(loss) reclassified from AOCL to  “other income”					Gain/(loss) recognized through “other income”
	2012		2011		2012			2011		2012		2011
Cash flow hedges
Foreign currency forward contracts	$	299	$	1,314	$	(2,118	)	$	1,152	$	—	$	—
Non-designated derivatives
Foreign currency forward contracts	$	—	$	—	$	—		$	—	$	—	$	(546	)

Note 11 — Fair Value of Financial Instruments

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

	March 31, 2012								December 31, 2011
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Carrying Amount		Estimated Fair Value
Assets—
Marketable securities	$	5,346	$	5,346	$	—	$	—	$	4,701	$	4,701
Liabilities—
Foreign currency forward contracts	$	644	$	—	$	644	$	—	$	3,061	$	3,061

The derivative instruments have been valued using actively quoted prices and quotes obtained from the counterparties to the derivative instruments. Our cash and cash equivalents, accounts receivable 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.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Note 12 — Commitments and Contingencies

As discussed in Note 6, in May 2010 Anadarko sent a letter asserting that the initial attempted deepwater drilling moratorium in the U.S. Gulf of Mexico was an event of force majeure under the drilling contract for the Noble Amos Runner. In June 2010, Anadarko filed a declaratory judgment action in Federal District Court in Houston, Texas seeking to have the court declare that a force majeure condition had occurred and that the drilling contract was terminated by virtue of the initial proclaimed moratorium. We disagree that a force majeure event occurred and that Anadarko had the right to terminate the contract. In August 2010, we filed a counterclaim seeking damages from Anadarko for breach of contract. This matter is currently set for trial during the second quarter of 2012. As a result of the uncertainties noted above, we have not recognized any revenue under the portion of this contract relating to the period after termination and the matter could have a material positive effect on our results of operations or cash flows for the period in which the matter is resolved should the court ultimately rule in our favor.

A separate dispute with Anadarko relating to Hurricane Ike costs is the subject of a lawsuit brought by Anadarko after the initiation of the force majeure action described above. In the Hurricane Ike Case, which was filed in August 2010, Anadarko is seeking to recover various costs and damages including damages to recover two of our rigs under contract to Anadarko, costs that it may incur in the future to recover mooring components from the sea floor and costs Anadarko claims were incurred for a mooring upgrade of the two rigs. The Hurricane Ike Case had been consolidated in the Federal District Court in Houston, Texas with an action we initiated in September 2009 against a manufacturer of wire ropes, Bridon-American Corp. and Bridon International, Ltd (collectively, “Bridon”), and their distributor, Certex USA Inc., for damages we sustained after Bridon wire ropes parted on several of our drilling rigs during Hurricane Ike. The court granted our motion for summary judgment against Anadarko in this case. This ruling can be appealed by Anadarko. We do not believe Anadarko’s claims in the Hurricane Ike Case are meritorious and believe the likelihood of success by Anadarko is remote for the vast majority of damages it seeks in that case. The consolidated Bridon/Certex case is currently set for trial in the second quarter of 2012. While we do not believe Anadarko’s claims in this case are meritorious, we can make no assurances as to the outcome of this dispute.

The Noble Homer Ferrington is under contract with a subsidiary of ExxonMobil Corporation (“ExxonMobil”), who entered into an assignment agreement with BP for a two well farmout of the rig in Libya after successfully drilling two wells with the rig for ExxonMobil. In August 2010, BP attempted to terminate the assignment agreement claiming that the rig was not in the required condition. ExxonMobil has informed us that we must look to BP for payment of the dayrate during the assignment period. In August 2010, we initiated arbitration proceedings under the drilling contract against both BP and ExxonMobil. We do not believe BP had the right to terminate the assignment agreement and believe the rig continues to be fully ready to operate under the drilling contract. The rig has been operating under farm-out arrangements since March 2011. We believe we are owed dayrate by either or both of these clients. The operating dayrate was approximately $538,000 per day for the work in Libya. We are proceeding with the arbitration process and intend to vigorously pursue these claims. As a result of the uncertainties noted above, we have not recognized any revenue during the assignment period and the matter could have a material positive effect on our results of operations or cash flows in the period the matter is resolved should the arbitration panel ultimately rule in our favor.

In August 2007, we entered into a drilling contract with Marathon Oil Company (“Marathon”) for the Noble Jim Day to operate in the U.S. Gulf of Mexico. On January 1, 2011, Marathon provided notice that it was terminating the contract. Marathon’s stated reason for the termination was that the rig had not been accepted by Marathon by December 31, 2010, and Marathon also maintained that a force majeure condition existed under the contract. The contract contained a provision allowing Marathon to terminate if the rig had not commenced operations by December 31, 2010. We believe the rig was ready to commence operations and should have been accepted by Marathon. The contract term was for four years. No revenue has been recognized under this contract. We have contracted the rig for much of the original term with other customers. In March 2011, we filed suit in Texas State District Court against Marathon seeking damages for its actions, and the suit is proceeding. We cannot provide assurance as to the outcome of this lawsuit.

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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 fourth quarter of 2007, our Nigerian subsidiary received letters from the Nigerian Maritime Administration and Safety Agency (“NIMASA”) seeking to collect a two percent surcharge on contract amounts under contracts performed by “vessels,” within the meaning of Nigeria’s cabotage laws, engaged in the Nigerian coastal shipping trade. Although we do not believe that these laws apply to our ownership of drilling units, NIMASA is seeking to apply a provision of the Nigerian cabotage laws (which became effective on May 1, 2004) to our offshore drilling units by considering these units to be “vessels” within the meaning of those laws and therefore subject to the surcharge, which is imposed only upon “vessels.” Our offshore drilling units are not engaged in the Nigerian coastal shipping trade and are not in our view “vessels” within the meaning of Nigeria’s cabotage laws. In January 2008, we filed an originating summons against NIMASA and the Minister of Transportation in the Federal High Court of Lagos, Nigeria seeking, among other things, a declaration that our drilling operations do not constitute “coastal trade” or “cabotage” within the meaning of Nigeria’s cabotage laws and that our offshore drilling units are not “vessels” within the meaning of those laws. In February 2009, NIMASA filed suit against us in the Federal High Court of Nigeria seeking collection of the cabotage surcharge. In August 2009, the court issued a favorable ruling in response to our originating summons stating that drilling operations do not fall within the cabotage laws and that drilling rigs are not vessels for purposes of those laws. The court also issued an injunction against the defendants prohibiting their interference with our drilling rigs or drilling operations. NIMASA has appealed the court’s ruling, although the court dismissed NIMASA’s lawsuit filed against us in February 2009. We intend to take all further appropriate legal action to resist the application of Nigeria’s cabotage laws to our drilling units. The outcome of any such legal action and the extent to which we may ultimately be responsible for the surcharge is uncertain. If it is ultimately determined that offshore drilling units constitute vessels within the meaning of the Nigerian cabotage laws, we may be required to pay the surcharge and comply with other aspects of the Nigerian cabotage laws, which could adversely affect our operations in Nigerian waters and require us to incur additional costs of compliance.

NIMASA had previously informed the Nigerian Content Division of its position that we were not in compliance with the cabotage laws. The Nigerian Content Division makes determinations of companies’ compliance with applicable local content regulations for purposes of government contracting, including contracting for services in connection with oil and gas concessions where the Nigerian national oil company is a partner. The Nigerian Content Division had previously barred us from participating in new tenders as a result of NIMASA’s allegations, although the Division reversed its actions based on the favorable Federal High Court ruling. However, no assurance can be given with respect to our ability to bid for future work in Nigeria until our dispute with NIMASA is resolved.

We are from time to time a party to various lawsuits that are incidental to our operations in which the claimants seek an unspecified amount of monetary damages for personal injury, including injuries purportedly resulting from exposure to asbestos on drilling rigs and associated facilities. At March 31, 2012, there were 24 asbestos related lawsuits in which we are one of many defendants. These lawsuits have been filed in the United States in the states of Louisiana, Mississippi and Texas. We intend to vigorously defend against the litigation. We do not believe the ultimate resolution of these matters will have a material adverse effect on our financial position, results of operations or cash flows.

We are a defendant in certain claims and litigation arising out of operations in the ordinary course of business, including certain disputes with customers over receivables discussed in Note 6, 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 operate in a number of countries throughout the world and our income tax returns filed in those jurisdictions are subject to review and examination by tax authorities within those jurisdictions. The U.S. Internal Revenue Service (“IRS”) has completed its audit examination of our 2008 U.S. tax return and proposed adjustments and deficiencies with respect to certain items that were reported by us for the 2008 tax year. We believe that we have accurately reported all amounts in our 2008 tax return, and have filed protests with the IRS Office of Appeals contesting the examination team’s proposed adjustments. We intend to vigorously defend our reported positions. We have recently been informed by the IRS that our 2009 tax return is under audit. We expect to receive more Information Document Requests in the coming months. In addition, a U.S. subsidiary of Frontier is also under audit by the IRS for its 2007 and 2008 tax returns. Furthermore, we are currently contesting several non-U.S. tax assessments and may contest future assessments when we disagree with those assessments based on the technical merits of the positions established at the time of the filing of the tax return. We believe the ultimate resolution of the outstanding assessments, for which we have not made any accrual, will not have a material adverse effect on our consolidated financial statements. 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 the existing or future assessments.

22

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Certain of our non-U.S. income tax returns have been examined for the 2002 through 2008 periods and audit claims have been assessed for approximately $279 million (including interest and penalties), primarily in Mexico. In Mexico, these assessments total approximately $266 million. We recently received from the Regional Chamber of the Federal Tax Court adverse decisions with respect to approximately $6 million in assessments related to depreciation deductions, which we are appealing. We are also contesting all other assessments in Mexico. Tax authorities in Mexico and other jurisdictions may issue additional assessments or pursue legal actions as a result of tax audits and we cannot predict or provide assurance as to the ultimate outcome of such assessments and legal actions.

Additional audit claims of approximately $83 million attributable to customs and other business taxes have been assessed against us in other jurisdictions. We have contested, or intend to contest, these assessments, including through litigation if necessary, and we believe the ultimate resolution, for which we have not made any accrual, will not have a material adverse effect on our consolidated financial statements.

We maintain certain insurance coverage against specified marine perils which includes physical damage and loss of hire. Damage caused by hurricanes has negatively impacted the energy insurance market, resulting in more restrictive and expensive coverage for U.S. named windstorm perils. Accordingly, we have elected to significantly reduce the named windstorm insurance on our rigs operating in the U.S. Gulf of Mexico. Presently we insure the Noble Jim Thompson, Noble Amos Runner and Noble Driller for “total loss only” when caused by a named windstorm. The remaining rigs in the U.S. Gulf of Mexico are self-insured for named windstorm perils. Our rigs located in the Mexico portion of the Gulf of Mexico remain covered by commercial insurance for windstorm damage. In addition, we maintain physical damage deductibles on our rigs ranging from $15 million to $25 million per occurrence, depending on location. The loss of hire coverage applies only to our rigs operating under contract with a dayrate equal to or greater than $200,000 a day and is subject to a 45-day waiting period for each unit and each occurrence.

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 and contractual rights to indemnity 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, certain loss or damage to property on board 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 materially adversely affect our financial position, results of operations or cash flows. Additionally, there can be no assurance that those parties with contractual obligations to indemnify us will necessarily be financially able to indemnify us against all these risks.

In January 2012, we were assessed a fine by the Brazilian government in the amount of R$1.8 million (approximately $950,000) in connection with the inadvertent discharge of drilling fluid from one of our rigs offshore Brazil in September 2011. We have accepted the assessment.

In October 2011, we were assessed a fine by the Brazilian government in the amount of R$238,000 (approximately $135,000) in connection with the inadvertent discharge of drilling fluid from one of our rigs offshore Brazil in November 2010. We have accepted the assessment.

We carry protection and indemnity insurance covering marine third party liability exposures, which also includes coverage for employer’s liability resulting from personal injury to our offshore drilling crews. Our protection and indemnity policy currently has a standard deductible of $10 million per occurrence, with maximum liability coverage of $750 million.

In connection with our capital expenditure program, we had outstanding commitments, including shipyard and purchase commitments of approximately $3.0 billion at March 31, 2012.

23

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

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-Swiss (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.

Nigerian Operations

As previously disclosed, in November 2010 we finalized settlements with the SEC and the Department of Justice as the result of an internal investigation of the legality under the United States Foreign Corrupt Practices Act (“FCPA”) and local laws of certain reimbursement payments made by our Nigerian affiliate to our customs agents in Nigeria. In January 2011, a subsidiary of Noble-Swiss resolved an investigation by the Nigerian Economic and Financial Crimes Commission and the Nigerian Attorney General Office into these same activities. Any additional investigation by these or other agencies could damage our reputation and 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. Further, resolving any additional investigations could be expensive and consume significant time and attention of our senior management.

As of March 31, 2012, all four of our rigs operating in Nigeria were operating under temporary import permits. To date, we have been successful in obtaining new, or extending existing, temporary import permits. However, there can be no assurance that we will be able to obtain new permits or further extensions of permits necessary to continue the operation of our rigs in Nigeria. If we cannot obtain a new permit or an extension necessary to continue operations of any rig, we may need to cease operations under the drilling contract for such rig and relocate such rig from Nigerian waters. We cannot predict what impact these events may have on any such contract or our business in Nigeria, and we could face additional fines and sanctions in Nigeria. Furthermore, we cannot predict what changes, if any, relating to temporary import permit policies and procedures may be established or implemented in Nigeria in the future, or how any such changes may impact our business there.

24

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Note 13 — Segment and Related Information

We report our contract drilling operations as a single reportable segment: Contract Drilling Services. The consolidation of our contract drilling operations into one reportable segment is attributable to how we manage our business, and the fact that all of our drilling fleet is dependent upon the worldwide oil and gas industry. The mobile offshore drilling units comprising our offshore rig fleet operate in a single, global market for contract drilling services and are often redeployed globally in response to changing demands of our customers, which consist largely of major non-U.S. and government owned/controlled oil and gas companies throughout the world. Our Contract Drilling Services segment currently conducts contract drilling operations principally in the U.S. Gulf of Mexico, Mexico, Brazil, the North Sea, the Mediterranean, West Africa, the Middle East, India and the Asian Pacific.

We evaluate the performance of our operating segment primarily based on operating revenues and net income. Summarized financial information of our reportable segments for the three months ended March 31, 2012 and 2011 for Noble-Swiss and Noble-Cayman are shown in the following table. The “Other” column includes results of labor contract drilling services in Canada and Alaska, as well as corporate related items.

	Noble-Swiss
	Three Months Ended March 31,
	2012									2011
	Contract									Contract
	Drilling									Drilling
	Services			Other			Total			Services			Other			Total
Revenues from external customers	$	781,243		$	16,447		$	797,690		$	564,654		$	14,234		$	578,888
Depreciation and amortization		167,948			3,129			171,077			154,888			3,234			158,122
Segment operating income		140,267			3,376			143,643			84,716			1,548			86,264
Interest expense, net of amount capitalized		(89	)		(10,407	)		(10,496	)		(1,085	)		(17,956	)		(19,041	)
Income tax (provision)/ benefit		(22,600	)		1,011			(21,589	)		(18,863	)		3,504			(15,359	)
Segment profit/ (loss)		125,484			(5,309	)		120,175			66,880			(12,385	)		54,495
Total assets (at end of period)		13,248,321			646,880			13,895,201			11,716,530			213,355			11,929,885

	Noble-Cayman
	Three Months Ended March 31,
	2012									2011
	Contract									Contract
	Drilling									Drilling
	Services			Other			Total			Services			Other			Total
Revenues from external customers	$	781,243		$	16,447		$	797,690		$	564,654		$	14,234		$	578,888
Depreciation and amortization		167,948			2,625			170,573			154,888			2,767			157,655
Segment operating income		140,267			17,861			158,128			84,716			14,730			99,446
Interest expense, net of amount capitalized		(89	)		(10,407	)		(10,496	)		(1,085	)		(17,956	)		(19,041	)
Income tax (provision)/ benefit		(22,600	)		1,389			(21,211	)		(18,863	)		3,838			(15,025	)
Segment profit		125,484			9,168			134,652			66,880			780			67,660
Total assets (at end of period)		13,248,321			606,923			13,855,244			11,716,530			174,891			11,891,421

25

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Note 14 — Accounting Pronouncements

In May 2011, the FASB issued Accounting Standards Update (“ASU”) No. 2011-04, which amends FASB Accounting Standards Codification (“ASC”) Topic 820, “Fair Value Measurements and Disclosures.” This amended guidance clarifies the wording used to describe many of the requirements in accounting literature for measuring fair value and for disclosing information about fair value measurements. The goal of the amendment is to create consistency between the United States and international accounting standards. The guidance is effective for annual and interim reporting periods beginning on or after December 15, 2011. Our adoption of this guidance did not have a material impact on our financial condition, results of operations, cash flows or financial disclosures.

In June 2011, the FASB issued ASU No. 2011-05, which amends ASC Topic 220, “Comprehensive Income.” This ASU allows an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendment no longer allows an entity to show changes to other comprehensive income solely through the statement of equity. For publicly traded entities, the guidance is effective for annual and interim reporting periods beginning on or after December 15, 2011. Our adoption of this guidance did not have a material impact on our financial condition, results of operations, cash flows or financial disclosures.

Note 15 — Net Change in Other Assets and Liabilities

The net effect of changes in other assets and liabilities on cash flows from Noble-Swiss’ operating activities are as follows:

	Three months ended
	March 31,
	2012			2011
Accounts receivable	$	(88,969	)	$	(58,461	)
Other current assets		(71,328	)		(64,003	)
Other assets		5,148			4,611
Accounts payable		7,014			1,864
Other current liabilities		(31,789	)		(18,626	)
Other liabilities		(5,466	)		18,923
	$	(185,390	)	$	(115,692	)

The net effect of changes in other assets and liabilities on cash flows from Noble-Cayman’s operating activities are as follows:

	Three months ended
	March 31,
	2012			2011
Accounts receivable	$	(88,969	)	$	(58,461	)
Other current assets		(72,745	)		(65,318	)
Other assets		5,147			2,132
Accounts payable		6,304			1,805
Other current liabilities		(31,691	)		(17,602	)
Other liabilities		(5,466	)		18,899
	$	(187,420	)	$	(118,545	)

26

NOBLE CORPORATION (NOBLE-SWISS) AND SUBSIDIARIES

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

Note 16 — Guarantees of Registered Securities

Noble-Cayman or one or more subsidiaries of Noble-Cayman are a co-issuer or guarantor or otherwise obligated as of March 31, 2012 as follows:

	Issuer
Notes	(Co-Issuer(s))	Guarantor(s)
$300 million 5.875% Senior Notes due 2013	Noble-Cayman	Noble Drilling Corporation ("NDC");
		NHIL
$250 million 7.375% Senior Notes due 2014	NHIL	Noble-Cayman
$350 million 3.45% Senior Notes due 2015	NHIL	Noble-Cayman
$300 million 3.05% Senior Notes due 2016	NHIL	Noble-Cayman
$300 million 2.50% Senior Notes due 2017	NHIL	Noble-Cayman
$202 million 7.50% Senior Notes due 2019	NDC;	Noble-Cayman;
	Noble Drilling Holding LLC ("NDH");	Noble Holding (U.S.) Corporation ("NHC")
	Noble Drilling Services 6 LLC ("NDS6")
$500 million 4.90% Senior Notes due 2020	NHIL	Noble-Cayman
$400 million 4.625% Senior Notes due 2021	NHIL	Noble-Cayman
$400 million 3.95% Senior Notes due 2022	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

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

27

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

March 31, 2012

(in thousands)

													Other
													Non-guarantor
	Noble-		NHC and NDH										Subsidiaries			Consolidating
	Cayman		Combined			NDC			NHIL		NDS6		of Noble			Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	24,973	$	264		$	—		$	4	$	—	$	175,974		$	—		$	201,215
Accounts receivable		—		15,427			1,766			—		—		721,642			—			738,835
Taxes receivable		—		4,566			—			—		—		90,556			—			95,122
Prepaid expenses		—		412			20			—		—		85,809			—			86,241
Short-term notes receivable from affiliates		27,695		119,476			—			—		—		122,298			(269,469	)		—
Accounts receivable from affiliates		798,994		107,014			928,971			126,978		37,014		5,337,669			(7,336,640	)		—
Other current assets		—		640			196			—		—		121,461			—			122,297
Total current assets		851,662		247,799			930,953			126,982		37,014		6,655,409			(7,606,109	)		1,243,710
Property and equipment, at cost		—		2,277,714			71,180			—		—		12,988,104			—			15,336,998
Accumulated depreciation		—		(260,120	)		(53,732	)		—		—		(2,962,910	)		—			(3,276,762	)
Property and equipment, net		—		2,017,594			17,448			—		—		10,025,194			—			12,060,236
Notes receivable from affiliates		3,816,462		1,206,000			—			3,524,814		479,107		2,618,720			(11,645,103	)		—
Investments in affiliates		7,124,613		9,273,599			3,452,360			6,785,699		2,129,404		—			(28,765,675	)		—
Other assets		2,803		7,172			2,356			28,266		850		509,851			—			551,298
Total assets	$	11,795,540	$	12,752,164		$	4,403,117		$	10,465,761	$	2,646,375	$	19,809,174		$	(48,016,887	)	$	13,855,244
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables from affiliates	$	72,298	$	50,000		$	—		$	—	$	—	$	147,171		$	(269,469	)	$	—
Accounts payable		—		3,233			552			—		—		330,504			—			334,289
Accrued payroll and related costs		—		3,803			7,731			—		—		90,557			—			102,091
Accounts payable to affiliates		918,227		4,289,177			28,688			125,867		45,641		1,929,040			(7,336,640	)		—
Interest payable		5,965		—			—			21,945		630		—			—			28,540
Taxes payable		—		10,624			—			—		—		82,576			—			93,200
Other current liabilities		—		—			240			—		—		108,650			—			108,890
Total current liabilities		996,490		4,356,837			37,211			147,812		46,271		2,688,498			(7,606,109	)		667,010
Long-term debt		449,957		—			—			3,792,509		201,695		—			—			4,444,161
Notes payable to affiliates		2,856,106		994,500			85,000			975,000		1,342,000		5,392,497			(11,645,103	)		—
Deferred income taxes		—		—			15,731			—		—		224,610			—			240,341
Other liabilities		19,929		26,919			—			—		—		259,327			—			306,175
Total liabilities		4,322,482		5,378,256			137,942			4,915,321		1,589,966		8,564,932			(19,251,212	)		5,657,687
Commitments and contingencies
Total shareholder equity		7,473,058		7,373,908			4,265,175			5,550,440		1,056,409		10,519,743			(28,765,675	)		7,473,058
Noncontrolling interest		—		—			—			—		—		724,499			—			724,499
Total equity		7,473,058		7,373,908			4,265,175			5,550,440		1,056,409		11,244,242			(28,765,675	)		8,197,557
Total liabilities and equity	$	11,795,540	$	12,752,164		$	4,403,117		$	10,465,761	$	2,646,375	$	19,809,174		$	(48,016,887	)	$	13,855,244

28

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2011

(in thousands)

													Other
													Non-guarantor
	Noble-		NHC and NDH										Subsidiaries			Consolidating
	Cayman		Combined			NDC			NHIL		NDS6		of Noble			Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	146	$	385		$	—		$	—	$	—	$	234,525		$	—		$	235,056
Accounts receivable		—		10,810			3,371			—		—		572,982			—			587,163
Taxes receivable		—		4,566			—			—		—		70,718			—			75,284
Prepaid expenses		—		453			19			—		—		32,633			—			33,105
Short-term notes receivable from affiliates		—		119,476			—			—		—		122,298			(241,774	)		—
Accounts receivable from affiliates		1,683,740		99,202			879,581			159,132		33,905		6,372,657			(9,228,217	)		—
Other current assets		—		643			196			93		—		119,177			—			120,109
Total current assets		1,683,886		235,535			883,167			159,225		33,905		7,524,990			(9,469,991	)		1,050,717
Property and equipment, at cost		—		2,718,186			71,381			—		—		12,213,361			—			15,002,928
Accumulated depreciation		—		(220,662	)		(53,037	)		—		—		(2,860,702	)		—			(3,134,401	)
Property and equipment, net		—		2,497,524			18,344			—		—		9,352,659			—			11,868,527
Notes receivable from affiliates		3,842,062		675,000			—			2,336,527		572,107		2,678,192			(10,103,888	)		—
Investments in affiliates		6,969,201		9,101,938			3,450,212			6,605,771		2,141,450		—			(28,268,572	)		—
Other assets		3,230		8,092			2,541			18,548		880		504,870			—			538,161
Total assets	$	12,498,379	$	12,518,089		$	4,354,264		$	9,120,071	$	2,748,342	$	20,060,711		$	(47,842,451	)	$	13,457,405
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables from affiliates	$	72,298	$	50,000		$	—		$	—	$	—	$	119,476		$	(241,774	)	$	—
Accounts payable		—		5,577			985			—		—		429,167			—			435,729
Accrued payroll and related costs		—		2,897			6,518			—		—		99,493			—			108,908
Accounts payable to affiliates		2,079,719		4,166,021			27,341			112,953		34,107		2,808,076			(9,228,217	)		—
Interest payable		1,891		—			—			48,116		4,412		—			—			54,419
Taxes payable		—		10,032			—			—		—		81,158			—			91,190
Other current liabilities		—		—			240			—		—		123,159			—			123,399
Total current liabilities		2,153,908		4,234,527			35,084			161,069		38,519		3,660,529			(9,469,991	)		813,645
Long-term debt		1,274,949		—			—			2,595,320		201,695		—			—			4,071,964
Notes payable to affiliates		1,667,291		1,147,500			85,000			975,000		811,000		5,418,097			(10,103,888	)		—
Deferred income taxes		—		—			15,731			—		—		227,060			—			242,791
Other liabilities		19,929		24,878			—			—		—		210,565			—			255,372
Total liabilities		5,116,077		5,406,905			135,815			3,731,389		1,051,214		9,516,251			(19,573,879	)		5,383,772
Commitments and contingencies
Total shareholder equity		7,382,302		7,111,184			4,218,449			5,388,682		1,697,128		9,853,129			(28,268,572	)		7,382,302
Noncontrolling interest		—		—			—			—		—		691,331			—			691,331
Total equity		7,382,302		7,111,184			4,218,449			5,388,682		1,697,128		10,544,460			(28,268,572	)		8,073,633
Total liabilities and equity	$	12,498,379	$	12,518,089		$	4,354,264		$	9,120,071	$	2,748,342	$	20,060,711		$	(47,842,451	)	$	13,457,405

29

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF INCOME

Three Months Ended March 31, 2012

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	42,991		$	5,061		$	—		$	—		$	718,076		$	(19,818	)	$	746,310
Reimbursables		—			5,308			—			—			—			29,833			—			35,141
Labor contract drilling services		—			—			—			—			—			16,008			—			16,008
Other		—			—			—			—			—			231			—			231
Total operating revenues		—			48,299			5,061			—			—			764,148			(19,818	)		797,690
Operating costs and expenses
Contract drilling services		1,183			14,319			1,771			17,633			—			400,058			(19,818	)		415,146
Reimbursables		—			5,087			—			—			—			25,514			—			30,601
Labor contract drilling services		—			—			—			—			—			9,232			—			9,232
Depreciation and amortization		—			14,839			1,036			—			—			154,698			—			170,573
Selling, general and administrative		357			1,346			—			8,819			—			3,488			—			14,010
Total operating costs and expenses		1,540			35,591			2,807			26,452			—			592,990			(19,818	)		639,562
Operating income (loss)		(1,540	)		12,708			2,254			(26,452	)		—			171,158			—			158,128
Other income (expense)
Equity earnings in affiliates, net of tax		155,412			134,585			45,802			179,928			75,861			—			(591,588	)		—
Interest expense, net of amounts capitalized		(20,606	)		(14,914	)		(1,346	)		(20,972	)		(7,783	)		(19,896	)		75,021			(10,496	)
Interest income and other, net		1,386			7,824			16			29,254			3,110			34,830			(75,021	)		1,399
Income before income taxes		134,652			140,203			46,726			161,758			71,188			186,092			(591,588	)		149,031
Income tax provision		—			(8,776	)		—			—			—			(12,435	)		—			(21,211	)
Net Income		134,652			131,427			46,726			161,758			71,188			173,657			(591,588	)		127,820
Net loss attributable to noncontrolling interests		—			—			—			—			—			6,832			—			6,832
Net income attributable to Noble Corporation		134,652			131,427			46,726			161,758			71,188			180,489			(591,588	)		134,652
Other comprehensive income, net		3,761			—			—			—			—			3,761			(3,761	)		3,761
Comprehensive income attributable to Noble Corporation	$	138,413		$	131,427		$	46,726		$	161,758		$	71,188		$	184,250		$	(595,349	)	$	138,413

30

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF INCOME

Three Months Ended March 31, 2011

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	25,964		$	4,990		$	—		$	—		$	523,594		$	(11,943	)	$	542,605
Reimbursables		—			912			12			—			—			21,367			—			22,291
Labor contract drilling services		—			—			—			—			—			13,547			—			13,547
Other		—			—			—			—			—			445			—			445
Total operating revenues		—			26,876			5,002			—			—			558,953			(11,943	)		578,888
Operating costs and expenses
Contract drilling services		1,461			8,984			1,823			8,570			—			291,937			(11,943	)		300,832
Reimbursables		—			904			—			—			—			16,199			—			17,103
Labor contract drilling services		—			—			—			—			—			8,523			—			8,523
Depreciation and amortization		—			10,124			909			—			—			146,622			—			157,655
Selling, general and administrative		1,511			1,509			—			7,877			—			5,634			—			16,531
Gain on contract extinguishments, net		—			—			—			—			—			(21,202	)		—			(21,202	)
Total operating costs and expenses		2,972			21,521			2,732			16,447			—			447,713			(11,943	)		479,442
Operating income (loss)		(2,972	)		5,355			2,270			(16,447	)		—			111,240			—			99,446
Other income (expense)
Equity earnings in affiliates, net of tax		87,280			37,939			15,801			50,061			35,820			—			(226,901	)		—
Interest expense, net of amounts capitalized		(18,361	)		(14,592	)		(1,820	)		(22,496	)		(7,671	)		(2,131	)		48,030			(19,041	)
Interest income and other, net		1,713			5,538			11			11,309			1,792			29,908			(48,030	)		2,241
Income before income taxes		67,660			34,240			16,262			22,427			29,941			139,017			(226,901	)		82,646
Income tax provision		—			(858	)		—			—			—			(14,167	)		—			(15,025	)
Net Income		67,660			33,382			16,262			22,427			29,941			124,850			(226,901	)		67,621
Net loss attributable to noncontrolling interests		—			—			—			—			—			39			—			39
Net income attributable to Noble Corporation		67,660			33,382			16,262			22,427			29,941			124,889			(226,901	)		67,660
Other comprehensive income, net		3,489			—			—			—			—			3,489			(3,489	)		3,489
Net comprehensive loss attributable to noncontrolling interest		—			—			—			—			—			1			—			1
Comprehensive income attributable to Noble Corporation	$	71,149		$	33,382		$	16,262		$	22,427		$	29,941		$	128,379		$	(230,390	)	$	71,150

31

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Three Months Ended March 31, 2012

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Cash flows from operating activities
Net cash from operating activities	$	(11,189	)	$	9,223		$	4,529		$	(53,966	)	$	(8,425	)	$	171,796		$	—		$	111,968
Cash flows from investing activities
Capital expenditures		—			(136,890	)		—			—			—			(230,435	)		—			(367,325	)
Change in accrued capital expenditures		—			—			—			—			—			(127,393	)		—			(127,393	)
Notes receivable from affiliates		—			—			—			(1,188,287	)		—			—			1,188,287			—
Net cash from investing activities		—			(136,890	)		—			(1,188,287	)		—			(357,828	)		1,188,287			(494,718	)
Cash flows from financing activities
Borrowings on bank credit facilities		365,000			—			—			—			—			—			—			365,000
Repayments on bank credit facilities		(1,190,000	)		—			—			—			—			—			—			(1,190,000	)
Proceeds from issuance of senior notes, net		—			—			—			1,186,636			—			—			—			1,186,636
Contributions from joint venture partners		—			—			—			—			—			40,000			—			40,000
Distributions to parent		(52,727	)		—			—			—			—			—			—			(52,727	)
Advances (to) from affiliates		(274,544	)		127,546			(4,529	)		55,621			8,425			87,481			—			—
Notes payable to affiliates		1,188,287			—			—			—			—			—			(1,188,287	)		—
Net cash from financing activities		36,016			127,546			(4,529	)		1,242,257			8,425			127,481			(1,188,287	)		348,909
Net change in cash and cash equivalents		24,827			(121	)		—			4			—			(58,551	)		—			(33,841	)
Cash and cash equivalents, beginning of period		146			385			—			—			—			234,525			—			235,056
Cash and cash equivalents, end of period	$	24,973		$	264		$	—		$	4		$	—		$	175,974		$	—		$	201,215

32

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Three Months Ended March 31, 2011

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Cash flows from operating activities
Net cash from operating activities	$	(12,580	)	$	6,411		$	2,762		$	(48,978	)	$	(9,633	)	$	155,517		$	—		$	93,499
Cash flows from investing activities
Capital expenditures		—			(318,916	)		—			—			—			(290,685	)		—			(609,601	)
Change in accrued capital expenditures		—			—			—			—			—			(471	)		—			(471	)
Notes receivable from affiliates		—			—			—			—			—			2,000			(2,000	)		—
Refund from contract extinguishments		—			—			—			—			—			18,642			—			18,642
Net cash from investing activities		—			(318,916	)		—			—			—			(270,514	)		(2,000	)		(591,430	)
Cash flows from financing activities
Borrowings on bank credit facilities		200,000			—			—			—			—			—			—			200,000
Repayments on bank credit facilities		(240,000	)		—			—			—			—			—			—			(240,000	)
Proceeds from issuance of senior notes, net		—			—			—			1,087,833			—			—			—			1,087,833
Contributions from joint venture partners		—			—			—			—			—			396,000			—			396,000
Payments of joint venture debt		—			—			—			—			—			(693,494	)		—			(693,494	)
Settlement of interest rate swaps		—			—			—			—			—			(29,032	)		—			(29,032	)
Financing costs on credit facilities		(2,835	)		—			—			—			—			—			—			(2,835	)
Distributions to parent		(52,889	)		—			—			—			—			—			—			(52,889	)
Advances (to) from affiliates		92,838			330,187			(2,762	)		(1,038,855	)		9,633			608,959			—			—
Notes payable to affiliates		15,500			(17,500	)		—			—			—			—			2,000			—
Net cash from financing activities		12,614			312,687			(2,762	)		48,978			9,633			282,433			2,000			665,583
Net change in cash and cash equivalents		34			182			—			—			—			167,436			—			167,652
Cash and cash equivalents, beginning of period		42			146			—			—			—			333,211			—			333,399
Cash and cash equivalents, end of period	$	76		$	328		$	—		$	—		$	—		$	500,647		$	—		$	501,051

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Item 2. 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 March 31, 2012, and our results of operations for the three months ended March 31, 2012 and 2011. The following discussion should be read in conjunction with the consolidated financial statements and related notes contained in this Quarterly Report on Form 10-Q and the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2011 filed by Noble Corporation, a Swiss corporation (“Noble-Swiss”), and Noble Corporation, a Cayman Islands company (“Noble-Cayman”).

Forward-Looking Statements

This Quarterly Report on Form 10-Q includes “forward-looking statements” within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended. All statements other than statements of historical facts included in this report regarding contract backlog, fleet status, our financial position, business strategy, timing or results of acquisitions or dispositions, completion and acceptance of our newbuild rigs, contract commitments, dayrates, contract commencements, extension or renewals, contract tenders, the outcome of any dispute, litigation or investigation, plans and objectives of management for future operations, foreign currency requirements, results of joint ventures, indemnity and other contract claims, construction and upgrade of rigs, industry conditions including the effect of disruptions of drilling in the U.S. Gulf of Mexico, access to financing, impact of competition, governmental regulations and permitting, availability of labor, worldwide economic conditions, taxes and tax rates, indebtedness covenant compliance, and timing for compliance with any new regulations are forward-looking statements. When used in this report, 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. These forward-looking statements speak only as of the date of this report on Form 10-Q and we undertake no obligation to revise or update any forward-looking statement for any reason, except as required by law. We have identified factors including but not limited to operating hazards and delays, risks associated with operations outside the U.S., actions by regulatory authorities, customers, joint venture partners, contractors, lenders and other third parties, legislation and regulations affecting drilling operations, costs and difficulties relating to the integration of businesses, factors affecting the level of activity in the oil and gas industry, supply and demand of drilling rigs, factors affecting the duration of contracts, the actual amount of downtime, factors that reduce applicable dayrates, violations of anti-corruption laws, hurricanes and other weather conditions and the future price of oil and gas that could cause actual plans or results to differ materially from those included in any forward-looking statements. These factors include those referenced or described in Part I, Item 1A. “Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2011, our Quarterly Reports on Form 10-Q and in our other filings with the U.S. Securities and Exchange Commission (“SEC”). We cannot control such risk factors and other uncertainties, 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 and uncertainties when you are evaluating us.

Executive Overview

Noble-Swiss is a leading provider of offshore contract drilling services for the oil and gas industry. Our fleet of 79 mobile offshore drilling units consists of 14 semisubmersibles, 14 drillships, 49 jackups and two submersibles. Additionally, we have one floating production storage and offloading unit. Our fleet includes 11 units under construction as follows:

• five dynamically positioned, ultra-deepwater, harsh environment drillships and

• six high-specification heavy-duty, harsh environment jackup rigs.

Our global fleet is currently located in the following areas: the U.S. Gulf of Mexico, Mexico, Brazil, the North Sea, the Mediterranean, West Africa, the Middle East, India and the Asian Pacific. Noble and its predecessors have been engaged in the contract drilling of oil and gas wells since 1921.

34

Outlook

During the first three months of 2012, we continued to see stability in the offshore drilling market. In the U.S. Gulf of Mexico, the granting of permits and publication of new safety rules has led to more stable activity levels within the industry, especially as it relates to the deepwater markets. The continued stable activity has led to greater investment and has contributed to an improvement in dayrates for deepwater and ultra-deepwater rigs worldwide. While there are still risks, including potential third party environmental lawsuits targeting the permitting process, possible new drilling regulations, a failure of the federal agencies of the U.S. government to issue permits in a timely manner and the adoption by individual operators of new drilling or equipment standards exceeding those required by regulatory bodies, we believe those risks can be reduced as long as rigs continue to work without incident in the U.S. Gulf of Mexico.

There continues to be uncertainty regarding the sustainability of the global economic recovery, which is proceeding unevenly in different geographic regions. In addition to political instability in certain oil producing nations in the Middle East and North Africa, there is also uncertainty regarding recovery in the credit markets, particularly in Europe, which some analysts predict could be the catalyst for a worldwide recession. Oil prices during 2012 have remained at high levels as a result of supply side concerns in response to continued political unrest in the Middle East and North Africa coupled with anticipated demand growth from emerging markets. Natural gas prices in the United States continue to be at low levels based on current oversupply. We believe there continue to be competing factors that could impact the volatility in the offshore drilling market and the prices of oil and gas commodities for the foreseeable future.

Despite the instability in the global economy noted above, the market for offshore drilling services has continued its upward trend that began in 2011. We believe both the short-term and long-term outlook for the deepwater market continues to strengthen. Market dayrates for new ultra-deepwater units remain generally above $500,000, which is lower than the peak rates achieved in 2007 and 2008, but higher than rates seen in recent years. Short-term fixtures for very high specification units have exceeded $550,000, and in certain cases even exceeded $600,000. We believe this is an indication of where the market could be going should there continue to be a strong demand for ultra-deepwater drilling units. Utilization rates for jackup units stabilized in 2011, and improved in most regions during the first quarter of 2012. While we currently have several jackup rigs idle, we have seen tangible market activity and anticipate a favorable environment for these rigs in the short-term. We continue to see differentiation in the jackup market with newer units having utilization rates and dayrates exceeding those units that entered service before 2000, as customers display a preference for technologically advanced and efficient drilling alternatives.

Demand for our drilling services generally depends on a variety of economic and political factors, including worldwide demand for oil and gas, the ability of the Organization of Petroleum Exporting Countries (“OPEC”) to set and maintain production levels and pricing, the level of production of non-OPEC countries and the policies of various governments regarding access to their oil and gas reserves. Our results of operations depend on offshore drilling activity worldwide. Historically, oil and gas prices and market expectations of potential changes in these prices have significantly affected that level of activity. Generally, higher oil and natural gas prices, or our customers’ expectations of higher prices, result in greater demand for our services and lower oil and gas prices result in reduced demand for our services. Demand for our services is also a function of the worldwide supply of mobile offshore drilling units. Industry analysts widely report that a significant expansion of industry supply of both jackups and ultra-deepwater units is underway. The introduction of additional non-contracted rigs into the marketplace could have an adverse effect on demand for our services or the dayrates we are able to achieve.

As a result of exploration discoveries offshore Brazil, Petroleo Brasileiro S.A. (“Petrobras”), the Brazilian national oil company, recently announced that it had approved contracts with two contractors to lease a total of 26 drilling rigs, which are expected to be delivered in the next 48 to 90 months. The potential increase in supply from the Petrobras newbuilds could adversely impact overall industry dayrates and economics.

35

We currently have ten rigs under contract, or preparing for contracts, in Mexico with Pemex Exploracion y Produccion (“Pemex”), and three of these rigs have contracts scheduled to expire in 2012. Pemex continues to tender for additional jackup rigs as it attempts to increase the number of working rigs. Some previous tenders published by Pemex contained a requirement that certain units must have entered service since the year 2000. While Pemex did not succeed in securing a significant number of newer rigs from those published tenders, we cannot predict whether this age requirement will be present in future Pemex tenders. If this requirement is present in future tenders, it could require us to seek work for our rigs in other locations, as the ages of the majority of our rigs currently operating in Mexico do not meet this requirement. If such work is not available, it could lead to additional idle time on some of our rigs. We cannot predict how many rigs might be affected or how long they could remain idle. We remain optimistic that many, if not all, of our rigs currently operating in Mexico will be able to continue to secure long-term work with Pemex.

In January 2011, we announced the signing of a Memorandum of Understanding (“MOU”) with Petrobras regarding operations in Brazil. Under the terms of the MOU, we agreed to substitute the Noble Phoenix, then under contract with Shell in Southeast Asia, for the Noble Muravlenko. In connection with the cancellation of the contract on the Noble Phoenix, we recognized a non-cash gain of approximately $52.5 million during the first quarter of 2011, which represented the unamortized fair value of the in-place contract at acquisition. As a result of the substitution, we reached a decision not to proceed with the previously announced reliability upgrade to the Noble Muravlenko that was scheduled to take place in 2013. As a result, we incurred a non-cash charge of approximately $32.6 million related to the termination of outstanding shipyard contracts. We expect the actual substitution to take place in the third quarter of 2012 after the Noble Phoenix completes its shipyard work.

In connection with our existing drilling contracts with Petrobras for two of our drillships operating in Brazil, we approved certain shipyard reliability upgrade projects for these drillships, the Noble Leo Segerius and the Noble Roger Eason. These upgrade projects, planned through 2012, are designed to enhance the reliability and operational performance of these drillships. During the first quarter of 2012, the Noble Leo Segerius completed the shipyard portion of its reliability upgrade and departed the shipyard in Brazil for seatrials, final commissioning and customer acceptance activities. The Noble Leo Segerius is currently scheduled to return to work in the second quarter of 2012. The Noble Roger Eason is expected to enter the shipyard for its reliability upgrade in the second quarter of 2012, which is expected to take approximately 270 days to complete. There are a number of risks associated with shipyard projects of this nature, particularly in Brazil, including potential project delays and cost overruns because of labor, customs, local shipyard, local content and other issues. In addition, the drilling contracts for these vessels provide Petrobras with certain rights of termination in the event of excessive downtime, and it is possible that Petrobras could exercise this right in the future with respect to one or both of these drillships. We intend to continue to closely monitor and discuss with Petrobras the status of these projects and plan to take appropriate steps to mitigate identified risks, which depending upon the circumstances, could involve a variety of options.

Results and Strategy

Our business strategy focuses on the active expansion of our worldwide deepwater capabilities through construction, upgrades and modifications, and acquisitions of drilling units, as well as the deployment of our drilling assets in important oil and gas producing areas.

We may dispose of some or all of our lower specification units and related assets and operations in one or more transactions. These dispositions may include sales of assets to third parties, a spin-off or other distribution or separation of assets. In analyzing any disposition, we will consider the strategic benefit of the potential transaction while seeking to secure what we consider appropriate value. To date, no potential disposition has provided the results we seek. The drilling market for lower specification units has recently improved, and we have experienced increased utilization and dayrates for these assets in certain areas. Therefore, while we continue to evaluate disposition options, we believe these units should provide a positive contribution to our overall results under current market conditions. We can provide no assurance as to whether any disposition transaction will occur or what form it may take.

36

We have actively expanded our offshore drilling and deepwater capabilities in recent years through the construction of new rigs, and as part of this technical and operational expansion we plan to continue pursuing opportunities to upgrade our fleet to achieve greater technological capability, which would lead to increased drilling efficiencies. Our business strategy also focuses on the active expansion of our worldwide offshore drilling and deepwater capabilities through upgrades and modifications, acquisitions, divestitures of lower specification units and the deployment of our drilling assets in important oil and gas producing areas. At March 31, 2012, we continued our newbuild strategy with the following 11 projects:

• one dynamically positioned, ultra-deepwater, harsh environment Globetrotter-class drillship, which is scheduled to be delivered to our customer in the fourth quarter of 2013;

• four dynamically positioned, ultra-deepwater, harsh environment drillships at Hyundai Heavy Industries Co. Ltd. (“HHI”), the first of which is estimated to be delivered from the shipyard to begin acceptance testing in the second quarter of 2013; and

• six high-specification heavy duty, harsh environment jackup rigs, the first of which is estimated to be delivered from the shipyard to begin acceptance testing in the first quarter of 2013.

Of our 11 rigs under construction as of March 31, 2012, two of the drillships are contracted for five years or more. In addition, we recently received a letter of intent to enter into an 18-month contract on one jackup. The remaining eight rigs are currently being constructed without contracts.

While we cannot predict the future level of demand or dayrates for our drilling services or future conditions in the offshore contract drilling industry, we continue to believe we are well positioned within the industry and our newbuild program will further strengthen our position, especially in deepwater drilling.

In the first quarter of 2012, we recognized net income attributable to Noble-Swiss of $120 million, or $0.47 per diluted share, on total revenues of $798 million. Sequential results of key metrics are as follows:

	Three Months Ended
	March 31, 2012			December 31, 2011
Average dayrate	$	167,124		$	150,027
Average utilization		74	%		79	%
Daily contract drilling services costs	$	94,055		$	79,747
Contract drilling services margin		44	%		47	%

Contract Drilling Services Backlog

We maintain a backlog (as defined below) of commitments for contract drilling services. The following table sets forth, as of March 31, 2012, the amount of our contract drilling services backlog and the percent of available operating days committed for the periods indicated:

			Year Ending December 31,
	Total		2012 (1)			2013			2014			2015			2016-2023
	(In millions)
Contract Drilling Services Backlog
Semisubmersibles/Drillships (2) (6) (7)	$	12,567	$	1,721		$	2,457		$	2,415		$	1,625		$	4,349
Jackups/Submersibles (3)		1,944		840			647			370			80			7
Total (4)	$	14,511	$	2,561		$	3,104		$	2,785		$	1,705		$	4,356
Percent of Available Operating Days
Committed (5)				73	%		51	%		36	%		16	%		4	%

(1) Represents a nine-month period beginning April 1, 2012.

(2) Our drilling contracts with Petrobras provide an opportunity for us to earn performance bonuses based on downtime experienced for our rigs operating offshore Brazil. With respect to our semisubmersibles operating offshore Brazil for Petrobras, we have included in our backlog an amount equal to 75 percent of potential performance bonuses for such semisubmersibles, which amount is based on and generally consistent with our historical earnings of performance bonuses for these rigs. With respect to our drillships presently operating offshore Brazil for Petrobras, we (a) have not included in our backlog any performance bonuses for periods prior to the commencement of certain upgrade projects planned for 2012, which projects are designed to enhance the reliability and operational performance of these drillships, and (b) have included in our backlog an amount equal to 75 percent of potential performance bonuses for periods after the estimated completion of such upgrade projects. Our backlog for semisubmersibles/drillships includes approximately $226 million attributable to these performance bonuses.

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The drilling contracts with Shell for the Noble Globetrotter I, Noble Globetrotter II, Noble Jim Thompson, Noble Jim Day and Noble Clyde Boudreaux, as well as the letter of intent for the Noble Don Taylor (formerly unnamed HHI Drillship I), provide opportunities for us to earn performance bonuses based on key performance indicators as defined by Shell. With respect to these contracts, we have included in our backlog an amount equal to 75 percent of the potential performance bonuses for these rigs, except for the Noble Clyde Boudreaux, while working in Brazil, where limited bonus is expected. Our backlog for these rigs includes approximately $582 million attributable to these performance bonuses.

(3) Pemex has the ability to cancel its drilling contracts on 30 days or less notice without Pemex’s making an early termination payment. As of March 31, 2012, we had ten rigs contracted to Pemex in Mexico, and our backlog includes approximately $708 million related to such contracts at March 31, 2012.

(4) Our drilling contracts generally provide the customer an early termination right in the event we fail to meet certain performance standards, including downtime thresholds. For example, Petrobras has the right to terminate its contracts in the event of excessive downtime. While we have exceeded downtime thresholds on the Noble Dave Beard and the Noble Paul Wolff, we have not received any notification concerning contract cancellations to date nor do we anticipate receiving any such notifications.

(5) Percentages take into account additional capacity from the estimated dates of deployment of our newbuild rigs that are scheduled to commence operations during 2012 through 2015.

(6) We entered into an agreement with Shell, effective June 27, 2010, which provides that Shell may suspend the contracts on three of our units operating in the U.S. Gulf of Mexico during any period of regulatory restriction by paying reduced suspension dayrates in lieu of the normal operating dayrates. The term of the initial contract is also extended by the suspension period. The impact of this agreement is to shift backlog among periods with an immaterial increase to total backlog because of the reduced suspension rates.

(7) Noble and a subsidiary of Shell are involved in joint venture agreements to build, operate, and own both the Noble Bully I and the Noble Bully II. Pursuant to these agreements, each party has an equal 50 percent share in both vessels. As of March 31, 2012, the combined amount of backlog for these rigs totaled $2.49 billion, all of which is included in our backlog. Noble’s net interest in the backlog for these rigs was $1.24 billion.

Our contract drilling services backlog reported above reflects estimated future revenues attributable to both signed drilling contracts and letters of intent that we expect will become binding contracts. A letter of intent is generally subject to customary conditions, including the execution of a definitive drilling contract. For a number of reasons, it is possible that some customers that have entered into letters of intent will not enter into signed 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. 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 amount of actual revenues earned and the actual periods during which revenues are earned may be different than the backlog amounts and backlog periods set forth in the table above for various factors, including, but not limited to, shipyard and maintenance projects, operational downtime, weather conditions, bonuses and other factors that result in applicable dayrates lower than the full contractual operating dayrate. In addition, amounts included in the backlog may change as a result of government-imposed restrictions or delays in the issuance of drilling permits. Furthermore, 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 subsequent periods for which the backlog is calculated.

As of March 31, 2012, we estimate Shell and Petrobras represented approximately 66% and 17%, respectively, of our backlog.

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Nigerian Operations

As previously disclosed, in November 2010 we finalized settlements with the SEC and the Department of Justice as the result of an internal investigation of the legality under the United States Foreign Corrupt Practices Act (“FCPA”) and local laws of certain reimbursement payments made by our Nigerian affiliate to our customs agents in Nigeria. In January 2011, a subsidiary of Noble-Swiss resolved an investigation by the Nigerian Economic and Financial Crimes Commission and the Nigerian Attorney General Office into these same activities. Any additional investigation by these or other agencies could damage our reputation and 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. Further, resolving any additional investigations could be expensive and consume significant time and attention of our senior management.

As of March 31, 2012, all four of our rigs operating in Nigeria were operating under temporary import permits. To date, we have been successful in obtaining new, or extending existing, temporary import permits. However, there can be no assurance that we will be able to obtain new permits or further extensions of permits necessary to continue the operation of our rigs in Nigeria. If we cannot obtain a new permit or an extension necessary to continue operations of any rig, we may need to cease operations under the drilling contract for such rig and relocate such rig from Nigerian waters. We cannot predict what impact these events may have on any such contract or our business in Nigeria, and we could face additional fines and sanctions in Nigeria. Furthermore, we cannot predict what changes, if any, relating to temporary import permit policies and procedures may be established or implemented in Nigeria in the future, or how any such changes may impact our business there.

In April 2010, the Nigerian Oil and Gas Industry Content Development Bill was signed into law. The law is designed to create Nigerian content in operations and transactions within the Nigerian oil and gas industry. The law sets forth certain requirements for the utilization of Nigerian human resources and goods and services in oil and gas projects and creates a Nigerian Content Development and Monitoring Board to implement and monitor the law and develop regulations pursuant to the law. The Nigerian Content Development and Monitoring Board has indicated that it will require all non-Nigerian offshore drilling companies to reorganize their local operations to include Nigerian indigenous minority interests in the operating assets and to obtain the approval of the Nigerian Content Development and Monitoring Board for future work in Nigeria. The law also establishes a Nigerian Content Development Fund to fund the implementation of the law, and requires that one percent of the value of every contract awarded in the Nigerian oil and gas industry be paid into the fund. We cannot predict what impact the new law may have on our existing or future operations in Nigeria, but the effect on our operations there could be significant.

Results of Operations

For the Three Months Ended March 31, 2012 and 2011

Net income attributable to Noble Corporation (“Noble-Swiss”) for the three months ended March 31, 2012 (the “Current Quarter”) was $120 million, or $0.47 per diluted share, on operating revenues of $798 million, compared to net income for the three months ended March 31, 2011 (the “Comparable Quarter”) of $54 million, or $0.21 per diluted share, on operating revenues of $579 million.

The consolidated financial statements of Noble-Swiss include the accounts of Noble-Cayman, and Noble-Swiss conducts substantially all of its business through Noble-Cayman and its subsidiaries. As a result, 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 2012 and 2011, would be the same as the information presented below regarding Noble-Swiss in all material respects, except operating income for Noble-Cayman for the three months ended March 31, 2012 was $14 million higher than operating income for Noble-Swiss for the same period, primarily as a result of executive costs directly attributable to Noble-Swiss for operations support and stewardship related services.

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Rig Utilization, Operating Days and Average Dayrates

Operating revenues and operating costs and expenses for our contract drilling services segment are dependent on three primary metrics — rig utilization, operating days and dayrates. The following table sets forth the average rig utilization, operating days and average dayrates for our rig fleet for the three months ended March 31, 2012 and 2011:

	Average Rig Utilization  (1)						Operating Days (2)							Average Dayrates
	Three Months Ended March 31,						Three Months Ended March 31,							Three Months Ended March 31,
	2012			2011			2012		2011		% Change			2012		2011		% Change
Jackups		79	%		62	%		3,089		2,381		30	%	$	90,382	$	80,866		12	%
Semisubmersibles		86	%		69	%		1,092		868		26	%		355,098		277,859		28	%
Drillships		51	%		70	%		285		361		-21	%		278,693		301,647		-8	%
Total		74	%		61	%		4,466		3,610		24	%	$	167,124	$	150,294		11	%

(1) Information reflects our policy of reporting on the basis of the number of rigs in our fleet excluding newbuild rigs under construction.

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

Contract Drilling Services

The following table sets forth the operating revenues and the operating costs and expenses for our contract drilling services segment for the three months ended March 31, 2012 and 2011 (in thousands):

	Three Months Ended March 31,					Change
	2012		2011			$			%
Operating revenues:
Contract drilling services	$	746,310	$	542,605		$	203,705			38	%
Reimbursables (1)		34,702		21,604			13,098			61	%
Other		231		445			(214	)		-48	%
	$	781,243	$	564,654		$	216,589			38	%
Operating costs and expenses:
Contract drilling services	$	420,011	$	306,363		$	113,648			37	%
Reimbursables (1)		30,173		16,440			13,733			84	%
Depreciation and amortization		167,948		154,888			13,060			8	%
Selling, general and administrative		22,844		23,449			(605	)		-3	%
Gain on contract extinguishments, net		—		(21,202	)		21,202			-100	%
		640,976		479,938			161,038			34	%
Operating income	$	140,267	$	84,716		$	55,551			66	%

(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 — Changes in contract drilling services revenues for the Current Quarter as compared to the Comparable Quarter were driven by increases in both average dayrates and operating days. The 24 percent increase in operating days increased revenue by $129 million while the 11 percent increase in average dayrates increased revenues by approximately $75 million.

The change in contract drilling services revenues primarily relates to our semisubmersibles and jackups, which generated approximately $147 million and $87 million more revenue, respectively, in the Current Quarter. These amounts were offset by decreases in revenues from our drillships, which declined $30 million from the Comparable Quarter.

The 28 percent increase in semisubmersible average dayrates resulted in an $85 million increase in revenues from the Comparable Quarter while the increase in operating days of 26 percent resulted in an additional $62 million increase in revenues. The increase in semisubmersibles revenue is a result of drilling restrictions in the U.S. Gulf of Mexico in the Comparable Quarter, where lower standby rates replaced the standard operating dayrates for a majority of our contracts. The increase in operating days is primarily from the Noble Jim Day, the Noble Homer Ferrington, the Noble Paul Romano and the Noble Clyde Boudreaux, which all operated at full capacity during the Current Quarter after being off contract for the majority of the Comparable Quarter.

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The 30 percent increase in jackup operating days resulted in a $57 million increase in revenues, which was coupled with a 12 percent increase in jackup average dayrates, resulting in a $30 million increase in revenues from the Comparable Quarter. The increase in utilization primarily related to rigs in Mexico and the Middle East, which were operating during the Current Quarter but not in the Comparable Quarter. The increase in average dayrates resulted from improved market conditions in the global shallow water market and was spread throughout the jackup fleet.

The decrease in drillship revenues of $30 million primarily relates to the Noble Phoenix and the Noble Leo Segerius, which were off contract for the Current Quarter but maintained operating time during the Comparable Quarter, partially offset by the Noble Bully I beginning its contract with Shell in late March 2012.

Operating Costs and Expenses—Contract drilling services operating costs and expenses increased $114 million for the Current Quarter as compared to the Comparable Quarter. A portion of the increase is due to the crew-up expenses for the recently completed rigs, which have added approximately $28 million in expense during the Current Quarter. Excluding the additional expenses related to these rigs, our contract drilling costs increased $86 million in the Current Quarter from the Comparable Quarter. This change was primarily driven by a $30 million increase in labor, the majority of which is due to salary increases effective in the second quarter of the prior year, a $22 million increase in mobilization due to the amortization of certain rig moves and the demobilization of rigs in Mexico, a $10 million increase related to shorebase support, a $6 million increase in repair and maintenance, a $6 million increase in safety, training and regulatory inspections, a $3 million increase in rotation costs, a $3 million increase in insurance costs related to increased premiums on our new policy renewed in March 2012, a $3 million increase for rig communications and rental equipment and $3 million for rig catering and other miscellaneous expenses.

The increase in depreciation and amortization in the Current Quarter from the Comparable Quarter was primarily attributable to an additional calendar day during the Current Quarter coupled with the Noble Bully I, which was placed in service in March 2012.

Other

The following table sets forth the operating revenues and the operating costs and expenses for our other services for the three months ended March 31, 2012 and 2011:

	Three Months Ended March 31,				Change
	2012		2011		$			%
Operating revenues:
Labor contract drilling services	$	16,008	$	13,547	$	2,461			18	%
Reimbursables (1)		439		687		(248	)		-36	%
	$	16,447	$	14,234	$	2,213			16	%
Operating costs and expenses:
Labor contract drilling services	$	9,232	$	8,523	$	709			8	%
Reimbursables (1)		428		663		(235	)		-35	%
Depreciation and amortization		3,129		3,234		(105	)		-3	%
Selling, general and administrative		282		266		16			6	%
		13,071		12,686		385			3	%
Operating (loss) income	$	3,376	$	1,548	$	1,828			**

(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.

** Not a meaningful percentage.

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Operating Revenues and Costs and Expenses—The change in both revenue and expense primarily relate to the commencement of a refurbishment project with our customer, Shell, for one of its rigs to be operated under a labor contract in Alaska, combined with operational increases and foreign currency fluctuations in our Canadian operations.

Other Income and Expenses

Interest Expense, net of amount capitalized—Interest expense, net of amount capitalized, decreased $9 million in the Current Quarter as compared to the Comparable Quarter. The decrease is a result of higher capitalized interest in the Current Quarter as compared to the Comparable Quarter due primarily to the continued construction under our newbuild program. During the Current Quarter, we capitalized approximately 80 percent of total interest charges versus approximately 58 percent during the Comparable Quarter.

Income Tax Provision—Our income tax provision increased $6 million in the Current Quarter primarily as a result of a higher pre-tax income during the Current Quarter, partially offset by a lower tax rate in the Current Quarter. The 93 percent increase in pre-tax earnings generated a $14 million increase in tax expense while the 6 percent decrease in the income tax rate during the Current Quarter decreased the income tax provision by $8 million. The decrease in the income tax rate was primarily due to fluctuations on foreign exchange rates on our tax balances coupled with a geographic shift in the make-up of our revenues.

Liquidity and Capital Resources

Overview

Net cash from operating activities for the Current Quarter was $104 million and $87 million in the Comparable Quarter. The increase in net cash from operating activities in the Current Quarter was primarily attributable to a significant increase in net income, partially offset by an increase in accounts receivable. The increase in accounts receivable is related to the increased fleet activity in 2012 and Current Quarter mobilization billings. We had working capital of $574 million and $232 million at March 31, 2012 and December 31, 2011, respectively. As a result of our $1.2 billion debt offering in February 2012 and outstanding borrowings of $150 million on our credit facilities at March 31, 2012, total debt as a percentage of total debt plus equity increased to 35 percent at March 31, 2012 from 34 percent at December 31, 2011.

At March 31, 2012, we had a total contract drilling services backlog of approximately $14.5 billion. Our backlog as of March 31, 2012 reflects a commitment of 73 percent of available operating days for the remainder of 2012 and 51 percent for 2013. See additional information regarding our backlog at “Contract Drilling Services Backlog.”

Our principal capital resource in the Current Quarter was cash generated from our $1.2 billion senior notes offering and net cash from operating activities of $104 million. Cash generated during the Current Quarter was primarily used to repay borrowings outstanding under our bank credit facilities and to fund our capital expenditure program.

Our currently anticipated cash flow needs may include the following:

• committed capital expenditures, including expenditures for newbuild projects currently underway;

• normal recurring operating expenses;

• discretionary capital expenditures, including various capital upgrades;

• potential newbuild projects and acquisitions; and

• payments of dividends.

We currently expect to fund these cash flow needs with cash generated by our operations, cash on hand and borrowings under our existing credit facilities. However, to adequately cover our expected cash flow needs, we may require capital in excess of the amount provided through these sources, and we may delay or cancel certain discretionary capital expenditures as necessary.

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Capital Expenditures

Our primary liquidity requirement during 2012 is for capital expenditures. Capital expenditures, including capitalized interest, totaled $368 million and $614 million for the three months ended March 31, 2012 and 2011, respectively.

At March 31, 2012, we had 11 rigs under construction, and capital expenditures, excluding capitalized interest, for new construction during the first three months of 2012 totaled $133 million, as follows (in millions):

Rig type/name
Currently under construction
Drillships
Noble Don Taylor (formerly HHI Drillship I)	$	53.2
Noble Globetrotter II		30.0
Noble Bob Douglas (formerly HHI Drillship II)		1.1
Noble Sam Croft (formerly HHI Drillship III)		0.6
HHI Drillship IV		0.4
Jackups
Noble Regina Allen (formerly Noble Jackup I)		2.7
Noble Mick O'Brien (formerly Noble Jackup II)		2.2
Noble Houston Colbert (formerly Noble Jackup III)		1.7
Noble Sam Turner (formerly Noble Jackup IV)		1.4
Noble Tom Prosser (formerly Noble Jackup V)		1.4
Noble Jackup VI		1.4
Recently completed construction projects
Noble Bully II		19.0
Noble Globetrotter I		15.8
Noble Bully I		2.2
Total Newbuild Capital Expenditures	$	133.1

In addition to the newbuild expenditures noted above, capital expenditures during the first quarter of 2012 consisted of:

• $147 million for major projects, including $25 million in subsea related expenditures and $25 million to upgrade two drillships currently operating in Brazil;

• $47 million for other capitalized expenditures, including major maintenance and regulatory expenditures which generally have useful lives ranging from 3 to 5 years; and

• $41 million in capitalized interest.

Our total capital expenditure estimate for 2012 is approximately $1.9 billion. In addition, we anticipate additional charges related to capitalized interest, which may fluctuate as a result of the timing of completion of ongoing projects.

In connection with our capital expenditure program, as of March 31, 2012, we had outstanding commitments, including shipyard and purchase commitments, for approximately $3.0 billion, of which we expect to spend approximately $1.3 billion within the next twelve months.

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.

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Dividends

Our most recent quarterly payment to shareholders, totaling $36 million (or 0.13 CHF per share), in the form of a capital reduction, was declared on February 3, 2012 and paid on February 23, 2012 to holders of record on February 13, 2012. We anticipate the final tranche of our annual payments to shareholders in the form of a capital reduction will be made during May 2012. The declaration and payment of dividends in the future by Noble-Swiss and the making of distributions of capital, including returns of capital in the form of par value reductions, require authorization of the shareholders of Noble-Swiss. The amount of such dividends, distributions and returns of capital 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 and shareholders.

In April 2012, our shareholders approved the payment of a dividend funded from capital contribution reserve in a total amount equal to $0.52 per share to be paid in four equal installments scheduled for August 2012, November 2012, February 2013 and May 2013. These dividends will require us to make total cash payments of approximately $66 million in 2012, based on the number of shares currently outstanding. In connection with this approval, during the second quarter of 2012, we will record a payable of approximately $133 million, which represents this obligation to shareholders. Any additional issuances of shares would further increase this obligation.

Credit Facilities and Long-Term Debt

We have two separate revolving credit facilities in place which provide us with a total borrowing capacity of approximately $1.18 billion, of which $150 million was outstanding as of March 31, 2012. One credit facility, which has a capacity of $575 million, matures in 2013, and the other facility, which has a capacity of $600 million, matures in 2015 (together referred to as the “Credit Facilities”). The covenants and events of default under the Credit Facilities are substantially similar, and each facility contains a covenant that limits our ratio of debt to total tangible capitalization, as defined in the Credit Facilities, to 0.60. At March 31, 2012, our ratio of debt to total tangible capitalization was less than 0.36 for the Credit Facilities. We were in compliance with all covenants under the Credit Facilities as of March 31, 2012.

The Credit Facilities provide us with the ability to issue up to $300 million in letters of credit in the aggregate. While the issuance of letters of credit does not increase our borrowings outstanding under the Credit Facilities, it does reduce the amount available. At March 31, 2012, we had no letters of credit outstanding under the Credit Facilities. We believe that we maintain good relationships with our lenders under the Credit Facilities, and we believe that our lenders have the liquidity and capability to perform should the need arise for us to draw on the Credit Facilities.

In February 2012, we issued, through our indirect wholly-owned subsidiary, Noble Holding International Limited (“NHIL”), $1.2 billion aggregate principal amount of senior notes in three separate tranches, with $300 million of 2.50% Senior Notes due 2017, $400 million of 3.95% Senior Notes due 2022, and $500 million of 5.25% Senior Notes due 2042. The weighted average coupon of all three tranches is 4.13%. The net proceeds of approximately $1.19 billion, after expenses, were primarily used to repay the then outstanding balance on our Credit Facilities.

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 or assuming certain liens and sale and lease-back transactions. At March 31, 2012, we were in compliance with all our debt covenants. We continually monitor compliance with the covenants under our Credit Facilities and senior notes and, based on our expectations for 2012, expect to remain in compliance during the year.

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At March 31, 2012, we had letters of credit of $59 million and performance and tax assessment bonds totaling $304 million supported by surety bonds outstanding. Of the letters of credit outstanding, $27 million were issued to support bank bonds in connection with our drilling units in Nigeria. Additionally, certain of our subsidiaries issue, from time to time, guarantees of the temporary import status of rigs or equipment imported into certain countries in which we operate. These guarantees are issued in lieu of payment of custom, value added or similar taxes in those countries.

Our long-term debt was $4.4 billion at March 31, 2012 as compared to $4.1 billion at December 31, 2011. The increase in debt is a result of the issuance of $1.2 billion aggregate principal amount of senior notes, partially offset by the net repayment of $825 million on the Credit Facilities. For additional information on our long-term debt, see Note 7 to our consolidated financial statements.

New Accounting Pronouncements

In May 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-04, which amends FASB Accounting Standards Codification (“ASC”) Topic 820, “Fair Value Measurements and Disclosures.” This amended guidance clarifies the wording used to describe many of the requirements in accounting literature for measuring fair value and for disclosing information about fair value measurements. The goal of the amendment is to create consistency between the United States and international accounting standards. The guidance is effective for annual and interim reporting periods beginning on or after December 15, 2011. Our adoption of this guidance did not have a material impact on our financial condition, results of operations, cash flows or financial disclosures.

In June 2011, the FASB issued ASU No. 2011-05, which amends ASC Topic 220, “Comprehensive Income.” This ASU allows an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendment no longer allows an entity to show changes to other comprehensive income solely through the statement of equity. For publicly traded entities, the guidance is effective for annual and interim reporting periods beginning on or after December 15, 2011. Our adoption of this guidance did not have a material impact on our financial condition, results of operations, cash flows or financial disclosures.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Market risk is the potential for loss from 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 the Credit Facilities is at an agreed upon percentage point spread over LIBOR, or a base rate stated in the agreements. At March 31, 2012, we had $150 million outstanding under the Credit Facilities. Assuming our current level of debt, a change in LIBOR rates of one percent would increase our interest charges by approximately $2 million per year.

We maintain certain debt instruments at a fixed rate whose fair value will fluctuate based on changes in interest rates and market perceptions of our credit risk. The fair value of our long-term debt was $4.7 billion and $4.3 billion at March 31, 2012 and December 31, 2011, respectively. The increase was primarily a result of our issuance of $1.2 billion in debt in February 2012, partially offset by the net repayment of $825 million on our Credit Facilities coupled with changes in fair value related to changes in interest rates and market perceptions of our credit risk.

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Foreign Currency Risk

As a multinational company, we conduct business worldwide. 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 different 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 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 loss” (“AOCL”). Amounts recorded in AOCL 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.

Our North Sea and Brazil operations have a significant amount of their cash operating expenses payable in local currencies. To limit the potential risk of currency fluctuations, we typically maintain short-term forward contracts settling monthly in their respective local currencies. The forward contract settlements in the remainder of 2012 represent approximately 10 percent of these forecasted local currency requirements. The notional amount of the forward contracts outstanding, expressed in U.S. dollars, was approximately $13 million at March 31, 2012. Total unrealized losses related to these forward contracts were $0.6 million as of March 31, 2012 and were recorded as part of AOCL. A 10 percent change in the exchange rate for the local currencies would change the fair value of these forward contracts by approximately $1 million.

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 Corporation 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 all employees at the formula level in the qualified U.S. plans.

In addition to the U.S. plans, each of Noble Drilling (Land Support) Limited, Noble Enterprises Limited and Noble Drilling (Nederland) B.V., all indirect, wholly-owned subsidiaries of Noble-Swiss, maintains a pension plan that covers all of its salaried, non-union employees (collectively referred to as our “non-U.S. plans”). Benefits are based on credited service and employees’ compensation near retirement, 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” and could result in material cash expenditures in future periods.

46

Item 4. Controls and Procedures

David W. Williams, Chairman, President and Chief Executive Officer of Noble-Swiss, and James A. MacLennan, Senior Vice President and Chief Financial Officer of Noble-Swiss, have evaluated the disclosure controls and procedures of Noble-Swiss as of the end of the period covered by this report. On the basis of this evaluation, Mr. Williams and Mr. MacLennan have concluded that Noble-Swiss’ disclosure controls and procedures were effective as of March 31, 2012. Noble-Swiss’ disclosure controls and procedures are designed to ensure that information required to be disclosed by Noble-Swiss in the reports that it files with or submits to the SEC is 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.

David W. Williams, President and Chief Executive Officer of Noble-Cayman, and Dennis J. Lubojacky, 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, Mr. Williams and Mr. Lubojacky have concluded that Noble-Cayman’s disclosure controls and procedures were effective as of March 31, 2012. 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 is 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.

There was no change in either Noble-Swiss’ or Noble-Cayman’s internal control over financial reporting that occurred during the quarter ended March 31, 2012 that has materially affected, or is reasonably likely to materially affect, the internal control over financial reporting of each of Noble-Swiss or Noble-Cayman, respectively.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

Information regarding legal proceedings is set forth in Note 12 to our consolidated financial statements included in Item 1 of Part I of this Quarterly Report on Form 10-Q and is incorporated herein by reference.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table sets forth for the periods indicated certain information with respect to purchases of shares by Noble-Swiss:

						Total Number of		Maximum Number
						Shares Purchased		of Shares that May
	Total Number		Average			as Part of Publicly		Yet Be Purchased
	of Shares		Price Paid			Announced Plans		Under the Plans
Period	Purchased		per Share			or Programs		or Programs
January 2012		33,751	$	34.28	(1)		—		6,769,891
February 2012		141,912	$	37.06	(1)		—		6,769,891
March 2012		885	$	38.95	(1)		—		6,769,891

(1) Amounts represent shares surrendered by employees for withholding taxes payable upon the vesting of restricted stock or exercise of stock options and were not made pursuant to the share repurchase program which our Board of Directors authorized and adopted. Our repurchase program has no date of expiration.

Item 6. Exhibits

The information required by this Item 6 is set forth in the Index to Exhibits accompanying this Quarterly Report on Form 10-Q and is incorporated herein by reference.

47

SIGNATURES

Pursuant to the requirements 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 Swiss corporation
/s/ David W. Williams	May 7, 2012
David W. Williams	Date
Chairman, President and Chief Executive Officer (Principal Executive Officer)
/s/ James A. MacLennan
James A. MacLennan
Senior Vice President and Chief Financial Officer (Principal Financial Officer)
Noble Corporation, a Cayman Islands company
/s/ David W. Williams	May 7, 2012
David W. Williams	Date
President and Chief Executive Officer (Principal Executive Officer)
/s/ Dennis J. Lubojacky
Dennis J. Lubojacky
Vice President and Chief Financial Officer (Principal Financial Officer)

48

Index to Exhibits

Exhibit Number	Exhibit
2.1	Agreement and Plan of Merger, Reorganization and Consolidation, dated as of December 19, 2008, among Noble Corporation, a Swiss corporation (“Noble-Swiss”), 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).
2.2	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	Articles of Association of Noble-Swiss (filed as Exhibit 3.1 to Noble-Swiss’ Annual Report on Form 10-K filed on February 27, 2012 and incorporated herein by reference).
3.2	By-laws of Noble-Swiss (filed as Exhibit 3.2 to Noble-Swiss’ Current Report on Form 8-K filed on March 27, 2009 and incorporated herein by reference).
3.3	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 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).
4.2	Fourth Supplemental Indenture, dated as of February 10, 2012, among Noble Holding International Limited, as Issuer, Noble Corporation, as Guarantor, and The Bank of New York Mellon Trust Company, N.A., as Trustee, relating to 2.5% 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).
10.1*	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 Cayman’s Current Report on Form 8-K filed on February 7, 2012 and incorporated herein by reference).
10.2*	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-Cayman’s Current Report on Form 8-K filed on January 13, 2012 and incorporated herein by reference).
10.3*	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-Cayman’s Current Report on Form 8-K filed on January 13, 2012 and incorporated herein by reference).
10.4*	Form of Employment Agreement and Guaranty Agreement (filed as Exhibit 10.1 to Noble-Cayman’s Current Report on Form 8-K filed on January 13, 2012 and incorporated herein by reference).
10.5*	Form of Employment Agreement and Guaranty Agreement (filed as Exhibit 10.1 to Noble-Cayman’s Current Report on Form 8-K filed on February 7, 2012 and incorporated herein by reference).
10.6*	Noble Corporation 2012 Short Term Incentive Plan.
10.7*	Form of Noble Corporation Performance Restricted Stock Unit Agreement under the Noble Cayman 1991 Stock Option and Restricted Stock Plan.
10.8*	Amended and Restated 1991 Stock Option and Restricted Stock Plan (filed as Exhibit 10.2 to Noble Cayman’s Current Report on Form 8-K filed on April 30, 2012 and incorporated herein by reference).
31.1	Certification of David W. Williams pursuant to the U.S. Securities Exchange Act of 1934, as amended, Rule 13a-14(a) or Rule 15d-14(a), for Noble-Swiss and for Noble-Cayman.
31.2	Certification of James A. MacLennan pursuant to the U.S. Securities Exchange Act of 1934, as amended, Rule 13a- 14(a) or Rule 15d-14(a), for Noble-Swiss.
31.3	Certification of Dennis J. Lubojacky pursuant to the U.S. Securities Exchange Act of 1934, as amended, Rule 13a- 14(a) or Rule 15d-14(a), for Noble-Cayman.
32.1+	Certification of David W. Williams pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, for Noble-Swiss and for Noble-Cayman.
32.2+	Certification of James A. MacLennan pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, for Noble-Swiss.

49

32.3+	Certification of Dennis J. Lubojacky pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, for Noble-Cayman.
101+	Interactive Data File

* Management contract or compensatory plan or arrangement

+ Furnished in accordance with Item 601(b)(32)(ii) of Regulation S-K.

50

EX-10.6

Exhibit 10.6

NOBLE CORPORATION

2012 SHORT TERM INCENTIVE PLAN

Section 1. Purpose

The success of Noble Corporation (“Noble”) and its subsidiaries (collectively, unless the context otherwise requires, the “Company”) is a result of the efforts of all key employees. In order to focus each employee’s efforts on optimizing the Company’s overall results, operationally and financially, the Company maintains this Short Term Incentive Plan (the “Plan”) to reward employees for successful achievement of specific goals.

An effective incentive plan should both align employee interests with those of shareholders and motivate and influence employee behavior. Key positions within the Company have the ability to make a positive contribution to key factors that increase shareholder value. These factors can be quantified and measured through achievement of various financial and operational targets, such as safety, earnings per share and cash operating margins. The objectives of using such targets in the formulation of the specific Company goals are to link an employee’s annual incentive award more closely to the creation of shareholder wealth and to promote a culture of high performance and an environment of team work.

Section 2. Participation and Eligibility

Full-time employees in salary classifications 18N and higher are eligible for consideration of a bonus under the Plan, subject to the approval of the Compensation Committee (the “Committee”) of the Board of Directors (the “Board”) of Noble. Each such employee will be considered either a “corporate employee” or a “division employee” for purposes of adjustment of such employee’s target bonus pursuant to Section 6. Full-time, non-exempt employees not in such salary classifications are also eligible for consideration of a bonus under the Plan, subject to the discretion of the Committee. The Plan year shall be the calendar year.

To be eligible to receive a bonus payment with respect to a Plan year, an employee must be actively employed by the Company on the last day of such Plan year and must continue to be employed through the date on which bonus payments for such Plan year are made. An employee shall not be eligible to receive any bonus payment if the employee’s employment with the Company terminates for any reason, either voluntarily or involuntarily, before that date on which bonus payments for a Plan year are made.

Notwithstanding the foregoing, in the event of death, disability or retirement, the employee or estate of the former employee may receive a pro-rated payment from the Plan, at the discretion of the Committee and the Chief Executive Officer (the “CEO”). For purposes of the Plan, “disability” means any termination of employment with the Company or an affiliate of the Company because of a long-term or total disability, as determined by the Committee and CEO, and “retirement” means a termination of employment with the Company on a voluntary basis by a person if, immediately prior to such termination of employment, the sum of the age and the number of years of continuous service of such person with the Company (or affiliate) is equal to or greater than 60.

The total bonus paid for a Plan year shall not be greater than the aggregate bonus accruals for all participating offices and divisions for such Plan year.

Section 3. Administrative Procedures

During the fourth quarter of each year, the Company will commence preparation of budgets and forecasts for the succeeding Plan year. The Board will approve the budget for the Plan year not later than March 31^st of such Plan year.

Goals for a Plan year for each of the categories in Section 5 will be compiled by management and submitted to the Committee for approval at the first regularly scheduled Committee meeting of each new Plan year. The specific goals established for the Plan year will be set forth in an Annex II to this Plan for such Plan year, and the Annex II hereto for each Plan year shall be incorporated into and made a part of this Plan for such Plan year.

If, after the establishment of goals for a Plan year, the budget changes substantially due to subsequent events, such as the acquisition or sale of assets, then the CEO shall, at his discretion, recommend to the Committee the adjustment of the respective goals in order that they may not be adversely impacted by such an event. Any such revised goals shall be applicable to the Plan year from and after the time of their approval.

2

Section 4. Target Bonus

A target bonus is determinable for each full-time employee in salary classification 18N or higher. The target bonus for an employee is an amount equal to the employee’s salary at the end of the Plan year multiplied times the target bonus percentage assigned to such employee’s salary classification. 50 percent of this amount is eligible to be paid based on the achievement of the stated goals under the Plan, as set forth below and on page 4, and 50 percent will be available at the discretion of the Compensation Committee based on merit, individual and team performance and additional selected criteria. Target bonus percentages range from 10 percent to 100 percent based on salary classification, as follows:

Salary Classification	Target Bonus Percentage
18N		10	%
19N		15	%
20N through 22N		20	%
23N through 24N		25	%
25N		30	%
26C		35	%
27C through 28C		40	%
29C through 30C		45	%
31C through 32C		50	%
33C		55	%
33D		60	%
34C		65	%
35C		70	%
36C		75	%
37C		80	%
38C		90	%
39C		100	%

Section 5. Goal Categories and Weightings

Goals for the following categories will be approved by the Committee for each Plan year. Such goals will then be set forth in the Annex II to this Plan for such Plan year. The relative weighting assigned to each goal will be as set forth below subject to annual review by the Committee.

Corporate Goals

	Assigned Weight
1. Safety Results		25	%
2. Earnings per Share		35	%
3. Cash Operating Margin		40	%

3

Operating Division Goals

Gulf Coast, Mexico, Middle East (including India), West Africa, North Sea, Brazil and Hibernia:

1. Safety Results	35	%
2. Cash Operating Margin	65	%

Section 6. Adjustment of Target Bonus

The respective employee target bonuses determined pursuant to Section 4 for a Plan year are subject to adjustment as set forth in this Section to reflect the levels of achievement of the specific, predetermined goals for such Plan year. Any bonus multiplier achieved will be applied to the stated corporate and division goals, pursuant to the terms of the Plan. In situations where the goal achievement calculation falls between two adjacent ranges, percentages ending in .5 or higher will round up to the next range, where as percentages below .5 will round down. In addition, a maximum bonus multiplier of 2.0 may be applied to the discretionary portion of the STIP award, subject to the approval of the Committee and CEO, as stated in Section 7 of this document.

Corporate Employees. In order to promote cooperation between the corporate office and the divisions, the target bonus for a corporate employee will be weighted 25 percent for achievement of the corporate goals, 25 percent for the cumulative average achievement of the division goals and 50 percent will be based on merit, individual and team performance and additional selected criteria, as determined by the Compensation Committee.

Operating Division Employees. In order to promote cooperation among the operating divisions and recognition by each division of its contribution to the Company’s overall performance, the target bonus for a division employee will be weighted 25 percent for achievement of the applicable division goals, 25 percent for achievement of the corporate goals and 50 percent will be based on merit, individual and team performance and additional selected criteria, as determined by the Compensation Committee.

Rig-Based Employees. The target bonus for a rig-based employee will be weighted 50 percent for achievement of safety results on an individual rig basis and 50 percent will be based on merit, individual and team performance and additional selected criteria, as determined by the Compensation Committee.

4

Subject to the determination by the Board of a sufficient bonus pool for a Plan year pursuant to Section 7, the bonus payable to an eligible employee in salary classification 18N or higher will be an amount equal to such employee’s target bonus amount multiplied times the applicable multiplier determined under the following schedule:

Combined Weighted Percentage of Goal Achievement	Applicable Multiplier to Calculate  Bonus Payable
Greater than 160%		2.00
141 – 160%		1.75
131 – 140%		1.50
121 – 130%		1.40
106 – 120%		1.20
96 – 105%		1.00
76 – 95%		.75
65 – 75%		.50
Below 65%		.00

Section 7. Allocation of Bonus Payable

After the end of each Plan year, the Board, in its best business judgment, will determine the total bonus pool for such Plan year, giving due consideration to the aggregate target bonus amounts, overall Company performance, and levels of attainment of the specific, predetermined corporate or division goals for such Plan year. In determining overall Company performance, the Board will consider the Company’s performance in relation to both the predetermined corporate and division goals and the prevailing market conditions in the industry during the Plan year.

The total bonus pool authorized by the Board for a Plan year may be an amount equal to, less than, or greater than the aggregate amount of the bonuses payable to all eligible employees in salary classifications 18N through 39C (the “Aggregate Calculated Pool”).

All eligible employees in salary classifications 18N through 39C will receive a bonus as calculated in accordance with Section 6, provided the Board has determined and authorized a total bonus pool in an amount equal to or greater than the Aggregate Calculated Pool. If the Board authorizes a total bonus pool in an amount less than the Aggregate Calculated Pool, then the Board shall also determine the percentage of such bonus pool (which may be any percentage up to 100 percent) that shall be allocated to the eligible employees in salary classifications 18N through 39C, and the bonuses otherwise payable to such employees, subject to the last sentence of the next succeeding paragraph, will be prorated accordingly based on the amount so allocated. In such event, the percentage of the total bonus pool not so allocated, if any, shall be available for payment to the eligible full-time, non-exempt employees not in salary classifications 18N through 39C based upon merit. If the Board authorizes a total bonus pool in an amount greater than the Aggregate Calculated Pool, then the excess amount will be allocated to eligible full-time, non-exempt employees not in salary classifications 18N through 39C, subject to the discretion of the Committee. Managers having responsibility for recommending the allocation of bonuses to eligible full-time, non-exempt employees not in salary classifications 18N through 39C shall submit their recommended bonus based on their performance and contributions to the Executive Vice President and the CEO for review and approval.

5

All bonus calculations, allocations and recommendations are subject to review and approval by the Committee. Notwithstanding anything otherwise contained in this Plan, the Committee and the CEO (and any delegated designee of the CEO) shall have the authority to adjust individual bonus amounts as deemed to be appropriate for any reason, including, but not limited to, company or division performance, individual employee performance, employee conduct, etc.

Section 8. At-Will Employment

Nothing in the Plan guarantees or constitutes a contract for any specific term of employment or otherwise limits the Company’s or an employee’s right to terminate the employment relationship for any reason at any time.

6

ANNEX II

2012 CORPORATE GOALS

1. Safety Results

The Company’s safety objective each year is to provide a strong focus on an injury free workplace. The Company’s goal, for purposes of this Plan, is to achieve an improvement in the Total Recordable Incident Rate (“TRIR”) of ten percent or more as compared to the industry average, as evidenced by the International Association of Drilling Contractors (“IADC”). For Corporate, this goal will be measured on the cumulative safety results of all divisions. An additional ..25 adjustment factor will be added to the adjustment factor if the Company’s TRIR is the lowest in the combined relative IADC categories (i.e., U.S. Water, Canada Water, Central and South American Water, European Water, Africa Water and Middle East Water).

The IADC normally publishes industry safety statistics in late February for the previous calendar year operating period, therefore, for the purpose of this Plan, the IADC industry average will be measured over the preceding twelve month period, ending September 30, 2012.

Measurement of Rate of Recordable Incidents	Adjustment Factor
75 percent or greater improvement above the industry average		1.75
50 – 74 percent improvement above the industry average		1.50
25 – 49 percent improvement above the industry average		1.25
10 – 24 percent improvement above the industry average		1.00
1 – 9 percent improvement above the industry average		.75
Less than one percent improvement above the industry average		.00

A-1

2. Earnings per Share

Earnings per share (EPS) is defined as net income from continuing operations after taxes before extraordinary items, divided by the fully diluted weighted average shares outstanding. Due to the timing of the release of earnings for fourth quarter of the Plan year, the peer groups earnings per share will be measured based on the first three quarters of published financial reports, while the fourth quarter will be calculated based on FirstCall. Earnings per share within a range of +/- five percent of the approved budget is assigned a 1.00 adjustment factor. The Earnings per share goal is then subject to adjustment within a range of zero, for achievement of less than 75 percent of the goal, to a factor of 1.50, for achievement of greater than 115 percent of the goal, based on the following scale:

Goal Achievement Range	Adjustment Factor
Greater than 115%		1.50
106 – 115%		1.25
96 – 105%		1.00
86 – 95%		.75
76 – 85%		.50
Less than 75%		.00

An amount of .25 will be added to the adjustment factor if the Company’s performance is in the top one-third of the drilling peer group¹ of companies and an additional .25 (for a maximum achievement of 2.0) will be added to the adjustment factor if the Company’s performance is the best of the drilling peer group . Earnings per share performance will be calculated on a year to year percentage change basis for both Corporate and the peer group. This calculation will compare the current Plan year to the previous year.

3. Cash Operating Margin

Cash operating margin is defined as contract drilling revenues less contract drilling cost including reimbursables. Due to the timing of the release of earnings for fourth quarter of the Plan year, cash operating margin will be measured over the preceding twelve month period, ending September 30, 2012. Cash operating margin within a range of +/- five percent of the approved budget is assigned a 1.00 adjustment factor. The cash operating margin goal is then subject to adjustment within a range of zero, for achievement of less than 75 percent of the goal, to a factor of 1.50, for achievement of greater than 115 percent of the goal, based on the following scale:

Goal Achievement Range	Adjustment Factor
Greater than 115%		1.50
106 – 115%		1.25
96 – 105%		1.00
86 – 95%		.75
76 – 85%		.50
Less than 75%		.00

¹  Drilling peer group includes Atwood Oceanics, Diamond Offshore Drilling, Inc., ENSCO International, Inc., Nabors Industries Ltd., , Rowan Companies, Inc., and Transocean

A-2

An amount of .25 will be added to the adjustment factor if the Company’s performance is in the top one-third of the drilling peer group of companies and an additional .25 (for a maximum achievement of 2.0) will be added to the adjustment factor if the Company’s performance is the best of the drilling peer group. Cash operating margin performance will be determined based on a rank order in terms of greatest margin percent.

2012 OPERATING DIVISION GOALS

1. Safety Results

The Company’s safety objective is to provide a strong focus on an injury free workplace. The Company’s goal, for purposes of this Plan, is to achieve an improvement in the Total Recordable Incident Rate (“TRIR”) of ten percent or more as compared to the industry average, as evidenced by the International Association of Drilling Contractors (“IADC”). For each division, this goal will be measured on an individual rig basis for all Rig Managers, Captains and Assistant Rig Managers; Drilling Superintendents will be measured on the cumulative safety results of the rigs under their supervision and all other employees in a division will be measured on the cumulative safety results of all rigs within the division. An additional .25 adjustment factor will be added to the each Division’s adjustment factor if the Division’s TRIR is the lowest in the respective IADC category (i.e., U.S. Water, Canada Water, Central and South American Water, European Water, Africa Water and Middle East Water).

The IADC normally publishes industry safety statistics in late February for the previous calendar year operating period, therefore, for the purpose of this Plan, the IADC industry average will be measured over the preceding twelve month period, ending September 2012 (third quarter statistics).

Measurement of Rate of Recordable Incidents	Adjustment Factor
75 percent or greater improvement above the industry average		1.75
50 – 74 percent improvement above the industry average		1.50
25 – 49 percent improvement above the industry average		1.25
10 – 24 percent improvement above the industry average		1.00
1 – 9 percent improvement above the industry average		.75
Less than one percent improvement above the industry average		.00

A-3

2. Cash Operating Margins

Cash operating margin is defined as contract drilling revenues less contract drilling cost, plus reimbursables adjusted for taxes. For the Canada division, labor contract drilling applies instead of contract drilling. Due to the timing of the release of earnings for fourth quarter of the Plan year, cash operating margin will be measured over the preceding twelve month period, ending September 30, 2012. Cash operating margin within a range of +/- five percent of the approved budget is assigned a 1.00 adjustment factor. The cash operating margin goal is then subject to adjustment within a range of zero, for achievement of less than 75 percent of the goal, to a factor of 1.50, for achievement of greater than 115 percent of the goal, based on the following scale:

Goal Achievement Range	Adjustment Factor
Greater than 115%		1.50
106 – 115%		1.25
96 – 105%		1.00
86 – 95%		.75
76 – 85%		.50
Less than 75%		.00

An amount of .25 will be added to the adjustment factor if the Company’s performance is in the top one-third of the drilling peer group of companies and an additional .25 (for a maximum achievement of 2.0) will be added to the adjustment factor if the Company’s performance is the best of the drilling peer group.

A-4

EX-10.7

Exhibit 10.7

NOBLE CORPORATION

PERFORMANCE-VESTED RESTRICTED STOCK UNIT AGREEMENT

THIS AGREEMENT, made as of the 3rd day of February, 2012, by and between NOBLE CORPORATION, a Swiss corporation (the “Company”), and             (“Employee”);

W I T N E S S E T H:

WHEREAS, the committee (the “Committee”) acting under the Noble Corporation 1991 Stock Option and Restricted Stock Plan, as amended (the “Plan”), has determined that it is desirable to award performance-vested Restricted Stock Units (as defined in the Plan) to Employee pursuant to the Plan; and

WHEREAS, pursuant to the Plan, the Committee has determined that the performance-vested Restricted Stock Units so awarded shall be subject to the restrictions, terms and conditions of this Agreement;

NOW, THEREFORE, in consideration of the premises and mutual covenants and agreements herein contained, the receipt and sufficiency of which are hereby acknowledged, the parties hereby agree as follows:

1. Performance-Vested Restricted Stock Unit Award. On the terms and conditions and subject to the restrictions, including forfeiture, hereinafter set forth, the Company hereby awards             Restricted Stock Units (the “Awarded Restricted Stock Units”) to Employee pursuant to the Plan. The Awarded Restricted Stock Units are being awarded to Employee effective as of the date of this Agreement (the “Effective Date”), and shall vest or be forfeited in accordance with (and otherwise be subject to) the provisions of this Agreement. The Awarded Restricted Stock Units are being awarded to Employee without the payment of any cash consideration by Employee. The award of Restricted Stock Units made to Employee pursuant to this Section 1 is hereby designated by the Committee to be a Performance Award for the purposes of the Plan.

2. Vesting and Forfeiture. The Awarded Restricted Stock Units shall be subject to being forfeited by Employee during the Restricted Period specified in the attached Schedule I (the “Restricted Period”), and shall vest in or be forfeited by Employee as follows:

(a) If Employee remains continuously employed by the Company or an Affiliate from the Effective Date through the end of the Restricted Period, the Awarded Restricted Stock Units shall vest and the forfeiture restrictions applicable to them under this Agreement shall terminate to the extent of the percentage of vesting achieved under the performance measure and vesting schedule provisions of the attached Schedule I, and any Awarded Restricted Stock Units that do not vest at the end of the Restricted Period shall be forfeited by Employee.

(b) If Employee’s employment with the Company or an Affiliate terminates during the Restricted Period by reason of the death, Disability or Retirement of Employee, then the number of Awarded Restricted Stock Units equal to the total number of Awarded Restricted Stock Units awarded hereunder multiplied by a fraction, (i) the numerator of which is the number of calendar months remaining in the Restricted Period that end after the date of Employee’s termination of employment with the Company or an Affiliate by reason of death, Disability or Retirement, and (ii) the denominator of which is 36, shall be forfeited by Employee. The remaining number of Awarded Restricted Stock Units awarded hereunder shall vest subject to the forfeiture restrictions applicable to them under this Agreement which shall terminate at the end of the Restricted Period to the extent of the percentage of vesting achieved under the performance measure and vesting schedule provisions of the attached Schedule I, and any Awarded Restricted Stock Units that do not vest at the end of the Restricted Period shall be forfeited by Employee.

(c) If Employee’s employment with the Company or an Affiliate terminates during the Restricted Period for any reason other than the death, Disability or Retirement of Employee, all of the Awarded Restricted Stock Units shall be forfeited by Employee.

(d) The foregoing provisions of this Section 2 to the contrary notwithstanding, if a 409A Change in Control (as defined below) occurs during the Restricted Period, 50% of the then outstanding Awarded Restricted Stock Units awarded hereunder shall vest and the forfeiture restrictions applicable to them under this Agreement shall terminate, and the remaining 50% of the then outstanding Awarded Restricted Stock Units awarded hereunder shall be forfeited by Employee. For the purposes of this Agreement, a “409A Change in Control” means a Change in Control (as defined in the Plan) that also is a change in control event within the meaning of U.S. Treas. Reg. section 1.409A-3(i)(5). The parties expressly agree that the provisions of this Section 2(d) shall be the exclusive means by which an Awarded Restricted Stock Unit shall vest in connection with a change in the ownership or effective control of the Company or a change in the ownership of the assets of the Company, and that no provision of any plan, employment agreement or other agreement or arrangement pertaining to Employee and the Company or an Affiliate shall cause an Awarded Restricted Stock Unit to vest in connection with a change in the ownership or effective control of the Company or a change in the ownership of the assets of the Company unless this Section 2(d) is amended in writing by the parties to provide for such vesting.

For the purposes of this Agreement, transfers of employment without interruption of service between or among the Company and any of its Affiliates shall not be considered a termination of employment.

3. Issuance of Shares. With respect to an Awarded Restricted Stock Unit that vests pursuant to the provisions of Section 2(a) or Section 2(b) hereof, as soon as practicable after the percentage of vesting achieved under the performance measure and vesting provisions of the attached Schedule I has been determined and certified in writing by the Committee and during the period beginning at the end of the Restricted Period and ending on March 15 following the end of the Restricted Period, the Company shall issue or transfer to Employee one Share in settlement of such Awarded Restricted Stock Unit and such Awarded Restricted Stock Unit shall be canceled. With respect to an Awarded Restricted Stock Unit that vests pursuant to the provisions of Section 2(d) hereof, as soon as practicable (but in no event later than 30 days) following the occurrence of a 409A Change in Control, the Company shall issue or transfer to Employee one Share in settlement of such Awarded Restricted Stock Unit and such Awarded Restricted Stock Unit shall be canceled.

2

4. No Rights as Shareholder. Employee shall have no rights as a shareholder of the Company, including, without limitation, voting rights or the right to receive dividends and distributions as a shareholder, with respect to the Shares subject to the Awarded Restricted Stock Units, unless and until such Shares are issued or transferred to Employee as provided herein.

5. Cash Dividend and Cash Distribution Equivalent Rights. The Company hereby awards cash dividend and cash distribution equivalent rights to Employee with respect to the Awarded Restricted Stock Units. The cash dividend and cash distribution equivalent rights awarded to Employee under this Section 5 shall entitle Employee to the payment, with respect to each Share that is subject to an Awarded Restricted Stock Unit that has not been canceled or forfeited, of an amount in cash equal to the amount of any cash dividend or other cash distribution paid by the Company with respect to one Share while such Awarded Restricted Stock Unit remains outstanding. Such amount shall be paid to Employee by Employee’s employer on the date of the payment of the related cash dividend or cash distribution. The award of cash dividend and cash distribution rights made to Employee pursuant to this Section 5 is not a Performance Award for the purposes of the Plan.

6. Agreements Regarding Withholding Taxes.

(a) Employee shall make arrangements satisfactory to the Committee for the payment of taxes of any kind that are required by law to be withheld with respect to the Awarded Restricted Stock Units or the cash dividend and cash distribution equivalent rights awarded under this Agreement, including, without limitation, taxes applicable to (i) the awarding of the Awarded Restricted Stock Units or the issuance or transfer of Shares in settlement thereof, or (ii) the awarding of the cash dividend and cash distribution equivalent rights or the payments made with respect thereto.

(b) Unless and until the Committee shall determine otherwise and provide notice to Employee in accordance with Section 6(c) of this Agreement, any obligation of Employee under Section 6(a) of this Agreement that arises with respect to the issuance or transfer of Shares in settlement of Awarded Restricted Stock Units that have become vested shall be satisfied by the Company withholding a portion of such Shares valued at their Fair Market Value as of the date on which the taxable event that gives rise to the withholding requirement occurs.

(c) The Committee may determine, after the Effective Date and on notice to the Employee, to authorize one or more arrangements (in addition to or in lieu of the arrangement described in Section 6(b) of this Agreement) satisfactory to the Committee for Employee to satisfy the obligation of Employee under Section 6(a) of this Agreement.

(d) If Employee does not, for whatever reason, satisfy the obligation of Employee under Section 6(a) of this Agreement, then the Company and its Affiliates shall, to the extent permitted by law, have the right to deduct from any payments of any kind otherwise due to Employee the amount required to satisfy the obligation of Employee under Section 6(a) of this Agreement.

3

7. Non-Assignability. This Agreement is not assignable or transferable by Employee. No right or interest of Employee under this Agreement or the Plan may be assigned, transferred or alienated, in whole or in part, either directly or by operation of law (except pursuant to a qualified domestic relations order within the meaning of Section 414(p) of the Code or a similar domestic relations order under applicable foreign law, either in such form as is acceptable to the committee), and no such right or interest shall be liable for or subject to any debt, obligation or liability of Employee.

8. Defined Terms; Plan Provisions. Unless the context clearly indicates otherwise, the capitalized terms used (and not otherwise defined) in this Agreement shall have the meanings assigned to them under the provisions of the Plan. By execution of this Agreement, Employee agrees that the Awarded Restricted Stock Units and the cash dividend and cash distribution equivalent rights awarded under this Agreement shall be governed by and subject to all applicable provisions of the Plan. This Agreement is subject to the Plan, and the Plan shall govern where there is any inconsistency between the Plan and this Agreement.

9. 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, except to the extent Texas law is preempted by federal law of the United States or by the laws of Switzerland.

10. Binding Effect. This Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective heirs, personal representatives, successors and permitted assigns.

11. Entire Agreement; Amendment. This Agreement, together with any Schedules and Exhibits and any other writings referred to herein or delivered pursuant hereto, constitutes the entire agreement between the parties hereto with respect to the subject matter hereof and supersedes all prior agreements and understandings, whether written or oral, between the parties with respect to the subject matter hereof. To the fullest extent provided by applicable law, this Agreement may be amended, modified and supplemented by mutual consent of the parties hereto at any time, with respect to any of the terms contained herein, in such manner as may be agreed upon in writing by such parties.

4

12. Notices. All notices and other communications hereunder shall be in writing and shall be deemed given if directed in the manner specified below, to the parties at the following addresses and numbers:

(a) If to the Company, when delivered by hand, confirmed fax or mail (registered or certified mail with postage prepaid) to:

Noble Corporation

Dorfstrasse 19A

6340 Baar

Switzerland

Attention: Chief Executive Officer

Fax: 281-596-4486

With a copy to:

Chairman of Compensation Committee

c/o Noble Corporation

Dorfstrasse 19A

6340 Baar

Switzerland

Fax: 281-596-4486

(b) If to Employee, when delivered by hand, confirmed fax or mail (registered or certified mail with postage prepaid) to:

The address and number, if any, set forth opposite

Employee’s signature below

Either party may at any time give to the other notice in writing of any change of address of the party giving such notice and from and after the giving of such notice the address or addresses therein specified will be deemed to be the address of such party for the purposes of giving notice hereunder.

13. Severability. If any provision of this Agreement is held to be unenforceable, this Agreement shall be considered divisible and such provision shall be deemed inoperative to the extent it is deemed unenforceable, and in all other respects this Agreement shall remain in full force and effect; provided, however, that if any such provision may be made enforceable by limitation thereof, then such provision shall be deemed to be so limited and shall be enforceable to the maximum extent permitted by applicable law.

14. Counterparts. This Agreement may be executed by the parties hereto in any number of counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same agreement. Each counterpart may consist of a number of copies hereof each signed by less than all, but together signed by all, the parties hereto.

15. Descriptive Headings. The descriptive headings 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.

16. Gender. Pronouns in masculine, feminine and neuter genders shall be construed to include any other gender, and words in the singular form shall be construed to include the plural and vice versa, unless the context otherwise requires.

5

17. References. 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.”

18. Unfunded Awards. The awards made under this Agreement are unfunded and unsecured obligations and rights to provide or receive compensation in accordance with the provisions of this Agreement, and to the extent that Employee acquires a right to receive compensation from the Company or an Affiliate pursuant to this Agreement, such right shall be no greater than the right of any unsecured general creditor of the Company or such Affiliate.

19. Compliance with Code Section 409A. The compensation payable to or with respect to Employee pursuant to this Agreement is intended to be compensation that is not subject to the tax imposed by Code Section 409A, and this Agreement shall be administered and construed to the fullest extent possible to reflect and implement such intent.

IN WITNESS WHEREOF, the Company and Employee have executed this Agreement as of the date first above written.

NOBLE CORPORATION
By:
Name:	Julie J. Robertson
Title:	Executive Vice President and Corporate Secretary

Address and fax number, if any:
	Employee
Dorfstrasse 19A
6340 Baar
Switzerland
Fax: 281-596-4486

6

SCHEDULE I

NOBLE CORPORATION

PERFORMANCE MEASURES FOR THE 2012-2014 PERFORMANCE CYCLE

AWARD OF PERFORMANCE-VESTED RESTRICTED STOCK

The Committee has determined and specifies that the following Performance Cycle, Restricted Period and Performance Measures shall apply to the Awarded Restricted Stock Units:

1. Performance Cycle. The Performance Cycle applicable to the Awarded Restricted Stock Units shall be the three-year period beginning on January 1, 2012, and ending on December 31, 2014.

2. Restricted Period. The Restricted Period applicable to the Awarded Restricted Stock Units shall be the three-year period beginning on the Effective Date and ending on the third anniversary of the Effective Date.

3. Performance Measure. The Performance Measure used to determine the extent of the vesting of the Awarded Restricted Stock Units is the cumulative total shareholder return (“TSR”) for the Shares of the Company for the Performance Cycle. The Awarded Restricted Stock Units that are outstanding as of the end of the Restricted Period will vest or be forfeited based on the Company’s TSR performance relative to the following group of competitor companies (the “Competitor Group”): Atwood Oceanics, Inc.; Baker Hughes Inc.; Diamond Offshore Drilling Inc.; Ensco International plc; FMC Technologies, Inc.; Halliburton Company; Nabors Industries Ltd.; National Oilwell Varco, Inc.; Oceaneering International, Inc.; Rowan Companies Inc.; Schlumberger Ltd.; Seadrill Ltd.; Transocean Ltd.; and Weatherford International Ltd.

TSR for the Performance Cycle shall be defined and calculated as follows, where “Beginning Price” is the average of the closing prices on the 30 NYSE trading days immediately preceding the beginning of the Performance Cycle, and the “Ending Price” is the average of the closing prices on the last 30 NYSE trading days of the Performance Cycle, in each case as applied to the applicable equity security:

TSR = (Ending Price – Beginning Price + dividends and cash distributions per share paid*)

Beginning Price

* Stock dividends paid in securities rather than cash in which there is a distribution of less than 25 percent of the outstanding shares (as calculated prior to the distribution) shall be treated as cash for purposes of this calculation.

S-1

The companies comprising the Competitor Group on the last NYSE trading day of the Performance Cycle shall be the companies used in the comparison for determining the Competitor Group performance measurement. If a Competitor Group company’s common equity security is no longer publicly traded on the last NYSE trading day of the Performance Cycle, then an appropriate proportionate adjustment will be effected over the remaining number of companies in the Competitor Group in making the determination of the Competitor Group measure; provided, however, that if the number of companies comprising the Competitor Group on the last NYSE trading day of the Performance Cycle is less than five, then notwithstanding anything contained herein to the contrary, the Company’s TSR performance shall be determined relative to the TSR performance of the applicable securities of the companies in the Dow Jones U.S. Oil Equipment & Services Index (the “Index”), and the Competitor Group performance measure shall be inapplicable and not used in determining the overall performance measure for vesting. If the Index performance measure becomes applicable, the companies comprising the Index on the last NYSE trading day of the Performance Cycle shall be the companies used in the comparison for determining the Company’s percentile rank relative to the companies in the Index. Any company in the Index on the last NYSE trading day of the Performance Cycle that entered the Index after the first NYSE trading day of the Performance Cycle will, for the purpose of calculating the TSR of the companies in the Index, be added into the Index only as of the time such company entered the Index. For example, if a company enters the Index on March 31 of a year during the Performance Cycle and is in the Index on the last trading day in the Performance Cycle, the entering company’s performance for comparison purposes relative to the Company and the other companies in the Index will be included only from such March 31 date on which the company entered the Index.

The number of the Awarded Restricted Stock Units that will vest at the end of the Restricted Period on the basis of the Performance Measure for the Performance Cycle shall be determined in accordance with the vesting schedule set forth on Annex I attached to and hereby made a part of this Schedule I. The level of achievement of the Performance Measure for the Performance Cycle, and the applicable vesting or forfeiture of the Awarded Restricted Stock Units that are outstanding at the end of the Restricted Period, shall be determined and certified in writing by the Committee as soon as reasonably practicable after the end of the Performance Cycle, but in no event later than 60 days after the end of the Performance Cycle.

S-2

ANNEX I TO SCHEDULE I

2012-2014 Performance Cycle

Performance-Vested Restricted Stock Unit Agreement Vesting Schedule

Performance Level	TSR Percentile Versus Peers	Percentage of the Target Achieved			Percentage of the Awarded Restricted Stock Units Vesting
Maximum	90th		200	%		100	%
Above Target	75th		150	%		75	%
Target	51st		100	%		50	%
Threshold	25th		50	%		25	%
Below Threshold	<25th		0	%		0	%

Percentile results between those listed will be interpolated on a linear basis for performance above the 25^th percentile (threshold level)

S-3

EX-31.1

EXHIBIT 31.1

Noble Corporation, a Swiss corporation

Noble Corporation, a Cayman Islands company

I, David W. Williams, certify that:

1. I have reviewed this quarterly report on Form 10-Q 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 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.

Date: May 7, 2012

/s/ David W. Williams

David W. Williams

Chairman, President and Chief Executive Officer

of Noble Corporation, a Swiss corporation, and

President and Chief Executive Officer

of Noble Corporation, a Cayman Islands company

EX-31.2

EXHIBIT 31.2

Noble Corporation, a Swiss corporation

I, James A. MacLennan, certify that:

1. I have reviewed this quarterly report on Form 10-Q 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 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.

Date: May 7, 2012

/s/ James A. MacLennan

James A. MacLennan

Senior Vice President and Chief Financial Officer of Noble Corporation, a Swiss corporation

EX-31.3

EXHIBIT 31.3

Noble Corporation, a Cayman Islands company

I, Dennis J. Lubojacky, certify that:

1. I have reviewed this quarterly report on Form 10-Q 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 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.

Date: May 7, 2012

/s/ Dennis J. Lubojacky

Dennis J. Lubojacky

Vice President and Chief Financial Officer of Noble Corporation, a Cayman Islands company

EX-32.1

EXHIBIT 32.1

Noble Corporation, a Swiss corporation

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 Quarterly Report of Noble Corporation, a Swiss corporation (“Noble-Swiss”), and Noble Corporation, a Cayman Islands company (“Noble-Cayman”) on Form 10-Q for the period ended March 31, 2012, as filed with the United States Securities and Exchange Commission on the date hereof (the “Report”), I, David W. Williams, Chairman, President and Chief Executive Officer of Noble-Swiss 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.

May 7, 2012	/s/ David W. Williams
	David W. Williams
	Chairman, President and Chief Executive Officer of Noble Corporation, a Swiss corporation, and President and Chief Executive Officer of Noble Corporation, a Cayman Islands company

EX-32.2

EXHIBIT 32.2

Noble Corporation, a Swiss corporation

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 Quarterly Report of Noble Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2012, as filed with the United States Securities and Exchange Commission on the date hereof (the “Report”), I, James A. MacLennan, 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.

May 7, 2012	/s/ James A. MacLennan
	James A. MacLennan
	Senior Vice President and Chief Financial Officer
	of Noble Corporation, a Swiss corporation

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 Quarterly Report of Noble Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2012, as filed with the United States Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis J. Lubojacky, 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.

May 7, 2012	/s/ Dennis J. Lubojacky
	Dennis J. Lubojacky
	Vice President and Chief Financial Officer of Noble Corporation, a Cayman Islands company

XML

Share Data (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		3 Months Ended
	Apr. 30, 2012	Mar. 31, 2012 Instalments	Dec. 31, 2011	Mar. 31, 2012 Stock Options [Member]	Mar. 31, 2011 Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from the diluted net income per share				1,200,000	700,000
Share Data (Textual) [Abstract]
Shares issued by Noble-Swiss		252,730,000	252,639,000
Treasury shares		463,000	287,000
Shares held by wholly-owned subsidiary		13,400,000
Remaining shares available under authorized share repurchase program		6,800,000
Shares repurchased under authorization		0
Additional conditionally authorizable shares without additional shareholder approval		133,100,000
Payments of dividend	$ 0.52
Number of instalments by which the instalments of dividends paid		4
Total cash payments		$ 66
Increase in current liabilities		$ 133

XML

Fair Value of Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Marketable securities		$ 4,701
Liabilities
Foreign currency forward contracts		3,061
Level 1 [Member]
Assets
Marketable securities	5,346
Level 2 [Member]
Liabilities
Foreign currency forward contracts	644
Level 3 [Member]
Assets
Marketable securities
Liabilities
Foreign currency forward contracts
Carrying Amount [Member]
Assets
Marketable securities	5,346	4,701
Liabilities
Foreign currency forward contracts	$ 644	$ 3,061

XML

Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Non-U.S. [Member]
Pension Costs
Service cost	$ 1,123	$ 1,093
Interest cost	1,358	1,383
Return on plan assets	(1,346)	(1,403)
Amortization of transition obligation		18
Recognized net actuarial loss	200	120
Net pension expense	1,335	1,211
U.S., Plans [Member]
Pension Costs
Service cost	2,431	2,152
Interest cost	2,196	2,143
Return on plan assets	(2,793)	(2,768)
Amortization of prior service cost	57	56
Recognized net actuarial loss	1,885	844
Net pension expense	$ 3,776	$ 2,427

XML

Commitments and Contingencies (Details)	3 Months Ended										3 Months Ended
	Mar. 31, 2012 USD ($) Rigs LegalMatter	Mar. 31, 2011 USD ($)	Oct. 31, 2011 USD ($)	Oct. 31, 2011 BRL	Jan. 31, 2011 USD ($)	Jan. 31, 2011 BRL	Mar. 31, 2012 Foreign Country [Member] USD ($)	Mar. 31, 2012 Mexico [Member] USD ($)	Mar. 31, 2012 Regional Chamber of the Federal Tax Court [Member] USD ($)	Mar. 31, 2012 Customs and Other Business Taxes [Member] USD ($)	Mar. 31, 2012 Marathon Oil Company [Member] USD ($)	Mar. 31, 2012 Nigeria [Member] Rigs
Organization and Basis of Presentation [Line Items]
Number of jackups	49											4
Oil and Gas In Process Activities [Line Items]
Revenue recognized by drilling contract	$ 746,310,000	$ 542,605,000									$ 0
Income Tax Examination [Line Items]
Audit claims, additional attributable to other business tax returns							279,000,000	266,000,000	6,000,000	83,000,000
Commitments and Contingencies (Textual) [Abstract]
Operating dayrate (per day)	538,000
Settlement amount of Hurricane Ike Case	3,000,000
Drilling contract backlog at the time of termination drilling contract backlog at the time of termination	752,000,000
Drilling contract term	4 years
NIMASA surcharge on contracts performed by "vessels" in Nigerian coastal shipping trade; overturned and dismissed by Federal High Court of Nigeria	2.00%
Number of asbestos lawsuits in which we are one of many defendants	24
Percentage of uncertain tax positions likelihood of being sustained	50.00%
Physical damage deductible per occurrence on rigs range minimum	25,000,000
Physical damage deductible per occurrence on rigs range maximum	15,000,000
Loss of hire coverage applies only to 'rigs' operating under day rate	200,000
Number of days waiting period	45 days
Amount of fine assessed by the foreign government			135,000	238,000	950,000	1,800,000
Protection and indemnity policy, standard deductible (per occurrence)	10,000,000
Maximum liability coverage under protection and indemnity policy	750,000,000
Outstanding commitments including shipyard and purchase commitments	$ 3,000,000,000
Years of effectiveness of employment agreements after the termination of employment	3 years

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Debt (Details Textual) (USD $)	1 Months Ended	3 Months Ended
	Feb. 29, 2012	Mar. 31, 2012 DebtAgreements Tranches	Mar. 31, 2011
Debt Instrument [Line Items]
Targeted capacity of additional revolving credit		$ 1,180,000,000
Face value of senior notes	1,200,000,000
Line of Credit Facility [Line Items]
Borrowing capacity under revolving credit facilities		575,000,000
Debt (Textual) [Abstract]
Number of revolving credit facility		2
Line of credit facility covenant terms		two separate revolving credit facilities in place which provide us with a total borrowing capacity of approximately $1.18 billion. One credit facility, which has a capacity of $575 million, matures in 2013, and the other facility, which has a capacity of $600 million, matures in 2015 (together referred to as the “Credit Facilities”). The covenants and events of default under the Credit Facilities are substantially similar, and each facility contains a covenant that limits our ratio of debt to total tangible capitalization, as defined in the Credit Facilities, to 0.60.
Maximum debt to tangible capitalization covenant		0.60
Letters of credit outstanding under credit facilities		0
Number of tranches		3
Proceeds from issuance of senior notes, net of debt issuance costs	1,190,000,000	1,186,636,000	1,087,833,000
Line of credit facility debt to tangible capitalization ratio		0.36
Revolving credit facility which matures in 2015 [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under revolving credit facilities		600,000,000
All three tranches [Member]
Debt Instrument [Line Items]
Weighted average coupon of all three tranches	4.13%
5.875% Senior Notes due 2013 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		5.875%
7.375% Senior Notes due 2014 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		7.375%
3.45% Senior Notes due 2015 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		3.45%
7.50% Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		7.50%
4.90% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		4.90%
6.20% Senior Notes due 2040 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		6.20%
3.05% senior notes due 2016 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		3.05%
4.625% senior notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		4.625%
6.05% senior notes due 2041 [Member]
Debt Instrument [Line Items]
Interest rate on the notes issued to the joint venture partner		6.05%
2.50% Senior Notes due 2017 [Member]
Debt Instrument [Line Items]
Face value of senior notes	300,000,000
Interest rate on the notes issued to the joint venture partner	2.50%	2.50%
3.95% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Face value of senior notes	400,000,000
Interest rate on the notes issued to the joint venture partner	3.95%	3.95%
5.25% Senior Notes due 2042 [Member]
Debt Instrument [Line Items]
Face value of senior notes	500,000,000
Interest rate on the notes issued to the joint venture partner	5.25%	5.25%
Credit Facilities [Member]
Debt Instrument [Line Items]
Targeted capacity of additional revolving credit		300,000,000
Borrowings outstanding		$ 0

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Net Change in Other Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2012

Operating Capital [Line Items]

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 Noble-Swiss’ operating activities are as follows:

	Three months ended
	March 31,
	2012			2011
Accounts receivable	$	(88,969	)	$	(58,461	)
Other current assets		(71,328	)		(64,003	)
Other assets		5,148			4,611
Accounts payable		7,014			1,864
Other current liabilities		(31,789	)		(18,626	)
Other liabilities		(5,466	)		18,923
	$	(185,390	)	$	(115,692	)

Noble-Cayman [Member]

Operating Capital [Line Items]

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 Noble-Cayman’s operating activities are as follows:

	Three months ended
	March 31,
	2012			2011
Accounts receivable	$	(88,969	)	$	(58,461	)
Other current assets		(72,745	)		(65,318	)
Other assets		5,147			2,132
Accounts payable		6,304			1,805
Other current liabilities		(31,691	)		(17,602	)
Other liabilities		(5,466	)		18,899
	$	(187,420	)	$	(118,545	)

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Net Change in Other Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Effect of changes in other assets and liabilities on cash flows from operating activities
Accounts receivable	$ (88,969)	$ (58,461)
Other current assets	(71,328)	(64,003)
Other assets	5,148	4,611
Accounts payable	7,014	1,864
Other current liabilities	(31,789)	(18,626)
Other liabilities	(5,466)	18,923
Net change in other assets and liabilities	(185,390)	(115,692)
Noble-Cayman [Member]
Effect of changes in other assets and liabilities on cash flows from operating activities
Accounts receivable	(88,969)	(58,461)
Other current assets	(72,745)	(65,318)
Other assets	5,147	2,132
Accounts payable	6,304	1,805
Other current liabilities	(31,691)	(17,602)
Other liabilities	(5,466)	18,899
Net change in other assets and liabilities	$ (187,420)	$ (118,545)

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Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2012

Accounting Pronouncements [Abstract]

Fair Value Measurements and Disclosures

In May 2011, the FASB issued Accounting Standards Update (“ASU”) No. 2011-04, which amends FASB Accounting Standards Codification (“ASC”) Topic 820, “Fair Value Measurements and Disclosures.” This amended guidance clarifies the wording used to describe many of the requirements in accounting literature for measuring fair value and for disclosing information about fair value measurements. The goal of the amendment is to create consistency between the United States and international accounting standards. The guidance is effective for annual and interim reporting periods beginning on or after December 15, 2011. Our adoption of this guidance did not have a material impact on our financial condition, results of operations, cash flows or financial disclosures.

Comprehensive income

In June 2011, the FASB issued ASU No. 2011-05, which amends ASC Topic 220, “Comprehensive Income.” This ASU allows an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendment no longer allows an entity to show changes to other comprehensive income solely through the statement of equity. For publicly traded entities, the guidance is effective for annual and interim reporting periods beginning on or after December 15, 2011. Our adoption of this guidance did not have a material impact on our financial condition, results of operations, cash flows or financial disclosures.

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Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2012 Forward Contracts [Member]	Mar. 31, 2012 Forward Contracts [Member] Cash flow hedges [Member]	Mar. 31, 2011 Forward Contracts [Member] Cash flow hedges [Member]	Mar. 31, 2011 Swap [Member] Cash flow hedges [Member]
Net unrealized gain/(loss) related to forward contracts included through AOCL
Net unrealized gain/(loss) at beginning of period	$ (3,061)	$ 1,766	$ 1,970	$ 600
Activity during period:
Cash flow hedges, settlement, during the period					(2,118)	(1,152)	(366)
Net unrealized gain/(loss) on outstanding foreign currency forward contracts	299					1,314
Net unrealized gain/(loss) at end of period	$ (644)	$ 1,766	$ 1,970	$ 600

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Gain on Contract Extinguishments, Net (Details) (USD $)	1 Months Ended		3 Months Ended
	Mar. 31, 2011	Feb. 28, 2011	Mar. 31, 2012	Mar. 31, 2011
Gain on contract extinguishments, net (Textual) [Abstract]
Gain on contract extinguishments	$ 52,500,000		$ 32,600,000	$ 21,202,000
Repayment of Bully credit facilities		693,000,000
Gain recognized on settlement and termination of interest rate swaps				$ 1,300,000

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Share Data (Details) (CHF) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Noble-Swiss' share capital
Shares outstanding and trading	252,267	252,352
Treasury shares	463	287
Total shares outstanding	252,730	252,639
Treasury shares held for share-based compensation plans	13,420	13,511
Total shares authorized for issuance	266,150	266,150
Par value per share (in Swiss Francs)	3.28	3.41

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Derivative Instruments and Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized through AOCL		$ (366)
Foreign currency forward contracts [Member] | Non-designated derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized through AOCL
Gain/(loss) reclassified from AOCL to "other income"
Gain/(loss) recognized through "other income"		(546)
Foreign currency forward contracts [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized through AOCL	299	1,314
Gain/(loss) reclassified from AOCL to "other income"	(2,118)	(1,152)
Gain/(loss) recognized through "other income"

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Guarantees of Registered Securities (Details Textual) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012 5.875% Senior Notes due 2013 [Member]	Dec. 31, 2011 5.875% Senior Notes due 2013 [Member]	Mar. 31, 2012 7.375% Senior Notes due 2014 [Member]	Dec. 31, 2011 7.375% Senior Notes due 2014 [Member]	Mar. 31, 2012 7.50% Senior Notes due 2019 [Member]	Dec. 31, 2011 7.50% Senior Notes due 2019 [Member]	Mar. 31, 2012 3.45% Senior Notes due 2015 [Member]	Dec. 31, 2011 3.45% Senior Notes due 2015 [Member]	Mar. 31, 2012 4.90% Senior Notes due 2020 [Member]	Dec. 31, 2011 4.90% Senior Notes due 2020 [Member]	Mar. 31, 2012 6.20% Senior Notes due 2040 [Member]	Dec. 31, 2011 6.20% Senior Notes due 2040 [Member]	Mar. 31, 2012 3.05% senior notes due 2016 [Member]	Dec. 31, 2011 3.05% senior notes due 2016 [Member]	Mar. 31, 2012 4.625% senior notes due 2021 [Member]	Dec. 31, 2011 4.625% senior notes due 2021 [Member]	Mar. 31, 2012 6.05% senior notes due 2041 [Member]	Dec. 31, 2011 6.05% senior notes due 2041 [Member]	Mar. 31, 2012 2.50% Senior Notes due 2017 [Member]	Feb. 29, 2012 2.50% Senior Notes due 2017 [Member]	Mar. 31, 2012 3.95% Senior Notes due 2022 [Member]	Feb. 29, 2012 3.95% Senior Notes due 2022 [Member]	Mar. 31, 2012 5.25% Senior Notes due 2042 [Member]	Feb. 29, 2012 5.25% Senior Notes due 2042 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 5.875% Senior Notes due 2013 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 7.375% Senior Notes due 2014 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 7.50% Senior Notes due 2019 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 3.45% Senior Notes due 2015 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 4.90% Senior Notes due 2020 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 6.20% Senior Notes due 2040 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 3.05% senior notes due 2016 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 4.625% senior notes due 2021 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 6.05% senior notes due 2041 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 2.50% Senior Notes due 2017 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 3.95% Senior Notes due 2022 [Member]	Mar. 31, 2012 Noble-Cayman [Member] 5.25% Senior Notes due 2042 [Member]
Guarantees of Registered Securities (Textual) [Abstract]
Outstanding principal balance	$ 299,957	$ 299,949	$ 249,684	$ 249,647	$ 201,695	$ 201,695	$ 350,000	$ 350,000	$ 498,811	$ 498,783	$ 399,891	$ 399,890	$ 299,941	$ 299,938	$ 399,492	$ 399,480	$ 397,590	$ 397,582	$ 299,827		$ 399,035		$ 498,238		$ 300,000	$ 250,000	$ 202,000	$ 350,000	$ 500,000	$ 400,000	$ 300,000	$ 400,000	$ 400,000	$ 300,000	$ 400,000	$ 500
Interest rate on the notes	5.875%		7.375%		7.50%		3.45%		4.90%		6.20%		3.05%		4.625%		6.05%		2.50%	2.50%	3.95%	3.95%	5.25%	5.25%	5.875%	7.375%	7.50%	3.45%	4.90%	6.20%	3.05%	4.625%	6.05%	2.50%	3.95%	5.25%

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Reserves for uncertain tax positions net	$ 125	$ 118
Related tax benefits	9	8
Reduction in the provision for income taxes, if reserves not realized	$ 125
Operational period	12 months

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Organization and Basis of Presentation

3 Months Ended

Mar. 31, 2012

Organization and Basis of Presentation [Abstract]

Organization and Basis of Presentation

Note 1 — Organization and Basis of Presentation

Noble Corporation, a Swiss corporation (“Noble-Swiss”), is a leading provider of offshore contract drilling services for the oil and gas industry. Our fleet of 79 mobile offshore drilling units consists of 14 semisubmersibles, 14 drillships, 49 jackups and two submersibles. Additionally, we have one floating production storage and offloading unit. Our fleet includes 11 units under construction as follows:

• five dynamically positioned, ultra-deepwater, harsh environment drillships and

• six high-specification heavy-duty, harsh environment jackup rigs.

Our global fleet is currently located in the following areas: the U.S. Gulf of Mexico, Mexico, Brazil, the North Sea, the Mediterranean, West Africa, the Middle East, India and the Asian Pacific. 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 a direct, wholly-owned subsidiary of Noble-Swiss, our publicly-traded parent company. Noble-Swiss’ principal asset is all of the shares of Noble-Cayman. Noble-Cayman has no public equity outstanding. The consolidated financial statements of Noble-Swiss include the accounts of Noble-Cayman, and Noble-Swiss conducts substantially all of its business through Noble-Cayman and its subsidiaries.

The accompanying unaudited consolidated financial statements of Noble-Swiss and Noble-Cayman have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) as they pertain to Form 10-Q. Accordingly, certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. The unaudited financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the financial position and results of operations for the interim periods, on a basis consistent with the annual audited consolidated financial statements. All such adjustments are of a recurring nature. The December 31, 2011 Consolidated Balance Sheets presented herein are derived from the December 31, 2011 audited consolidated financial statements. These interim financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2011, filed by both Noble-Swiss and Noble-Cayman. The results of operations for interim periods are not necessarily indicative of the results to be expected for the full year.

Certain amounts in prior periods have been reclassified to conform to the current year presentation.

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Receivables from Customers (Details) (USD $)	1 Months Ended	3 Months Ended
	Jun. 30, 2010	Mar. 31, 2012	Mar. 31, 2011
Receivables From Major Customers [Line Items]
Labor contract drilling services		$ 16,008,000	$ 13,547,000
Receivables from Customers (Textual) [Abstract]
Minimum days for charter contract with FPSO	100 days
Hiring date of the new unit	Jul. 23, 2010
Accounts receivable settlement amount		3,000,000
Anadarko Petroleum Corporation [Member]
Receivables From Major Customers [Line Items]
Accounts receivables related to attempted offset		13,000,000
Pemex Exploracion Y Produccion [Member]
Receivables From Major Customers [Line Items]
Labor contract drilling services		14,000,000
Subsidiary of BP PLC [Member]
Receivables From Major Customers [Line Items]
Outstanding receivables		$ 35,000,000

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Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Employee Benefit Plans [Abstract]

Pension Costs

Pension costs include the following components:

	Three Months Ended March 31,
	2012						2011
	Non-U.S.			U.S.			Non-U.S.			U.S.
Service cost	$	1,123		$	2,431		$	1,093		$	2,152
Interest cost		1,358			2,196			1,383			2,143
Return on plan assets		(1,346	)		(2,793	)		(1,403	)		(2,768	)
Amortization of prior service cost		—			57			—			56
Amortization of transition obligation		—			—			18			—
Recognized net actuarial loss		200			1,885			120			844
Net pension expense	$	1,335		$	3,776		$	1,211		$	2,427

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Debt (Tables)

3 Months Ended

Mar. 31, 2012

Debt [Abstract]

Long-term debt

Total debt consisted of the following at March 31, 2012 and December 31, 2011:

	March 31, 2012		December 31, 2011
Wholly-owned debt instruments:
5.875% Senior Notes due 2013	$	299,957	$	299,949
7.375% Senior Notes due 2014		249,684		249,647
3.45% Senior Notes due 2015		350,000		350,000
3.05% Senior Notes due 2016		299,941		299,938
2.50% Senior Notes due 2017		299,827		—
7.50% Senior Notes due 2019		201,695		201,695
4.90% Senior Notes due 2020		498,811		498,783
4.625% Senior Notes due 2021		399,492		399,480
3.95% Senior Notes due 2022		399,035		—
6.20% Senior Notes due 2040		399,891		399,890
6.05% Senior Notes due 2041		397,590		397,582
5.25% Senior Notes due 2042		498,238		—
Credit facilities		150,000		975,000
Total long-term debt	$	4,444,161	$	4,071,964

Estimated fair value of our long-term debt

The following table presents the estimated fair value of our long-term debt as of March 31, 2012 and December 31, 2011.

	March 31, 2012				December 31, 2011
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Wholly-owned debt instruments
5.875% Senior Notes due 2013	$	299,957	$	316,003	$	299,949	$	317,586
7.375% Senior Notes due 2014		249,684		277,685		249,647		278,966
3.45% Senior Notes due 2015		350,000		367,520		350,000		363,571
3.05% Senior Notes due 2016		299,941		308,804		299,938		306,057
2.50% Senior Notes due 2017		299,827		301,653		—		—
7.50% Senior Notes due 2019		201,695		246,435		201,695		248,623
4.90% Senior Notes due 2020		498,811		536,850		498,783		531,437
4.625% Senior Notes due 2021		399,492		424,808		399,480		416,847
3.95% Senior Notes due 2022		399,035		400,535		—		—
6.20% Senior Notes due 2040		399,891		440,619		399,890		450,017
6.05% Senior Notes due 2041		397,590		433,771		397,582		443,308
5.25% Senior Notes due 2042		498,238		494,298		—		—
Credit facilities		150,000		150,000		975,000		975,000
Total long-term debt	$	4,444,161	$	4,698,981	$	4,071,964	$	4,331,412

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Segment and Related Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Summarized financial information of our reportable segments
Revenues from external customers	$ 797,690	$ 578,888
Depreciation and amortization	171,077	158,122
Segment operating income	143,643	86,264
Interest expense, net of amount capitalized	(10,496)	(19,041)
Income tax provision	(21,589)	(15,359)
Segment profit/ (loss)	120,175	54,495
Total assets (at end of period)	13,895,201	11,929,885	13,495,159
Contract Drilling Services [Member]
Summarized financial information of our reportable segments
Revenues from external customers	781,243	564,654
Depreciation and amortization	167,948	154,888
Segment operating income	140,267	84,716
Interest expense, net of amount capitalized	(89)	(1,085)
Income tax provision	(22,600)	(18,863)
Segment profit/ (loss)	125,484	66,880
Total assets (at end of period)	13,248,321	11,716,530
Other [Member]
Summarized financial information of our reportable segments
Revenues from external customers	16,447	14,234
Depreciation and amortization	3,129	3,234
Segment operating income	3,376	1,548
Interest expense, net of amount capitalized	(10,407)	(17,956)
Income tax provision	1,011	3,504
Segment profit/ (loss)	(5,309)	(12,385)
Total assets (at end of period)	646,880	213,355
Noble-Cayman [Member]
Summarized financial information of our reportable segments
Revenues from external customers	797,690	578,888
Depreciation and amortization	170,573	157,655
Segment operating income	158,128	99,446
Interest expense, net of amount capitalized	(10,496)	(19,041)
Income tax provision	(21,211)	(15,025)
Segment profit/ (loss)	134,652	67,660
Total assets (at end of period)	13,855,244	11,891,421	13,457,405
Noble-Cayman [Member] | Contract Drilling Services [Member]
Summarized financial information of our reportable segments
Revenues from external customers	781,243	564,654
Depreciation and amortization	167,948	154,888
Segment operating income	140,267	84,716
Interest expense, net of amount capitalized	(89)	(1,085)
Income tax provision	(22,600)	(18,863)
Segment profit/ (loss)	125,484	66,880
Total assets (at end of period)	13,248,321	11,716,530
Noble-Cayman [Member] | Other [Member]
Summarized financial information of our reportable segments
Revenues from external customers	16,447	14,234
Depreciation and amortization	2,625	2,767
Segment operating income	17,861	14,730
Interest expense, net of amount capitalized	(10,407)	(17,956)
Income tax provision	1,389	3,838
Segment profit/ (loss)	9,168	780
Total assets (at end of period)	$ 606,923	$ 174,891

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Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Long-term debt
Long-term debt	$ 4,444,161	$ 4,071,964
Total Long-term Debt	4,444,161	4,071,964
5.875% Senior Notes due 2013 [Member]
Long-term debt
Total Long-term Debt	299,957	299,949
7.375% Senior Notes due 2014 [Member]
Long-term debt
Total Long-term Debt	249,684	249,647
3.45% Senior Notes due 2015 [Member]
Long-term debt
Total Long-term Debt	350,000	350,000
3.05% senior notes due 2016 [Member]
Long-term debt
Total Long-term Debt	299,941	299,938
2.50% Senior Notes due 2017 [Member]
Long-term debt
Long-term debt	299,827
7.50% Senior Notes due 2019 [Member]
Long-term debt
Total Long-term Debt	201,695	201,695
4.90% Senior Notes due 2020 [Member]
Long-term debt
Total Long-term Debt	498,811	498,783
4.625% senior notes due 2021 [Member]
Long-term debt
Total Long-term Debt	399,492	399,480
3.95% Senior Notes due 2022 [Member]
Long-term debt
Long-term debt	399,035
6.20% Senior Notes due 2040 [Member]
Long-term debt
Total Long-term Debt	399,891	399,890
6.05% senior notes due 2041 [Member]
Long-term debt
Total Long-term Debt	397,590	397,582
5.25% Senior Notes due 2042 [Member]
Long-term debt
Long-term debt	498,238
Credit Facilities [Member]
Long-term debt
Total Long-term Debt	$ 150,000	$ 975,000

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Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2012

Derivative Instruments and Hedging Activities [Abstract]

Net unrealized gain/(loss) related to cash flow hedges included in AOCL

The balance of the net unrealized gain/(loss) related to our cash flow hedges included in AOCL and related activity is as follows:

	Three Months Ended
	March 31,
	2012			2011
Net unrealized gain/(loss) at beginning of period	$	(3,061	)	$	1,970
Activity during period:
Settlement of foreign currency forward contracts during the period		2,118			(1,152	)
Settlement of interest rate swaps during the period		—			(366	)
Net unrealized gain on outstanding foreign currency forward contracts		299			1,314
Net unrealized gain/(loss) at end of period	$	(644	)	$	1,766

Summarize the financial statement presentation and fair value of derivative positions

The following tables, together with Note 11, summarize the financial statement presentation and fair value of our derivative positions as of March 31, 2012 and December 31, 2011:

			Estimated fair value
	Balance  sheet classification		March 31, 2012		December 31, 2011
Liability derivatives
Cash flow hedges
Short-term foreign currency forward contracts		Other current liabilities	$	644	$	3,061

Summarizes the recognized gains and losses of cash flow hedges and non-designated derivatives

To supplement the fair value disclosures in Note 11, the following summarizes the recognized gains and losses of cash flow hedges and non-designated derivatives through AOCL or through “other income” for the three months ended March 31, 2012 and 2011:

	Gain/(loss) recognized through AOCL				Gain/(loss) reclassified from AOCL to  “other income”					Gain/(loss) recognized through “other income”
	2012		2011		2012			2011		2012		2011
Cash flow hedges
Foreign currency forward contracts	$	299	$	1,314	$	(2,118	)	$	1,152	$	—	$	—
Non-designated derivatives
Foreign currency forward contracts	$	—	$	—	$	—		$	—	$	—	$	(546	)

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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value of Financial Instruments [Abstract]

Carrying amount and estimated fair value of financial instruments

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

	March 31, 2012								December 31, 2011
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Carrying Amount		Estimated Fair Value
Assets—
Marketable securities	$	5,346	$	5,346	$	—	$	—	$	4,701	$	4,701
Liabilities—
Foreign currency forward contracts	$	644	$	—	$	644	$	—	$	3,061	$	3,061

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Consolidated Statement of Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Shares	Additional Paid-in Capital	Retained Earnings	Treasury Shares	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Noble-Cayman [Member]	Noble-Cayman [Member] Shares	Noble-Cayman [Member] Additional Paid-in Capital	Noble-Cayman [Member] Retained Earnings	Noble-Cayman [Member] Accumulated Other Comprehensive Loss	Noble-Cayman [Member] Noncontrolling Interests
Beginning Balance at Dec. 31, 2010	$ 7,287,634	$ 917,684	$ 39,006	$ 6,630,500	$ (373,967)	$ (50,220)	$ 124,631	$ 7,260,655	$ 26,125	$ 416,232	$ 6,743,887	$ (50,220)	$ 124,631
Beginning Balance, shares at Dec. 31, 2010		262,415							261,246
Employee related equity activity
Amortization of share-based compensation	8,271		8,271
Issuance of share-based compensation shares		598	(598)
Issuance of share-based compensation shares, shares		176
Exercise of stock options	3,456	566	2,890
Exercise of stock options, shares		167
Tax benefit of stock options exercised	(1,119)		(1,119)
Restricted shares forfeited or repurchased for taxes	(5,700)	(1,074)	1,074		(5,700)
Restricted shares forfeited or repurchased for taxes, shares		(312)
Net income	54,456			54,495			(39)	67,621			67,660		(39)
Equity contribution by joint venture partner	361,000						361,000	361,000					361,000
Par value reduction payments	(34,920)	(30,343)	(4,577)
Capital contributions by parent - share-based compensation								5,151		5,151
Distributions to parent								(52,889)			(52,889)
Other comprehensive income (loss), net	3,488					3,489	(1)	3,488				3,489	(1)
Ending Balance at Mar. 31, 2011	7,676,566	887,431	44,947	6,684,995	(379,667)	(46,731)	485,591	7,645,026	26,125	421,383	6,758,658	(46,731)	485,591
Ending Balance, shares at Mar. 31, 2011		262,446							261,246
Beginning Balance at Dec. 31, 2011	8,097,852	766,595	48,356	6,676,444	(10,553)	(74,321)	691,331	8,073,633	26,125	450,616	6,979,882	(74,321)	691,331
Beginning Balance, shares at Dec. 31, 2011		252,639							261,246
Employee related equity activity
Amortization of share-based compensation	8,753		8,753
Issuance of share-based compensation shares		1,067	(1,067)
Issuance of share-based compensation shares, shares		352
Exercise of stock options	2,621	329	2,292
Exercise of stock options, shares		113
Tax benefit of stock options exercised	(142)		(142)
Restricted shares forfeited or repurchased for taxes	(6,451)	(1,138)	1,138		(6,451)
Restricted shares forfeited or repurchased for taxes, shares		(374)
Net income	113,343			120,175			(6,832)	127,820			134,652		(6,832)
Equity contribution by joint venture partner	40,000						40,000	40,000					40,000
Par value reduction payments	(36,370)	(29,220)	(7,150)
Capital contributions by parent - share-based compensation								5,070		5,070
Distributions to parent								(52,727)			(52,727)
Other comprehensive income (loss), net	3,761					3,761		3,761				3,761
Ending Balance at Mar. 31, 2012	$ 8,223,367	$ 737,633	$ 52,180	$ 6,796,619	$ (17,004)	$ (70,560)	$ 724,499	$ 8,197,557	$ 26,125	$ 455,686	$ 7,061,807	$ (70,560)	$ 724,499
Ending Balance, shares at Mar. 31, 2012		252,730							261,246

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Segment and Related Information (Tables)

3 Months Ended

Mar. 31, 2012

Segment and Related Information [Abstract]

Summarized financial information of reportable segment

Summarized financial information of our reportable segments for the three months ended March 31, 2012 and 2011 for Noble-Swiss and Noble-Cayman are shown in the following table. The “Other” column includes results of labor contract drilling services in Canada and Alaska, as well as corporate related items.

	Noble-Swiss
	Three Months Ended March 31,
	2012									2011
	Contract									Contract
	Drilling									Drilling
	Services			Other			Total			Services			Other			Total
Revenues from external customers	$	781,243		$	16,447		$	797,690		$	564,654		$	14,234		$	578,888
Depreciation and amortization		167,948			3,129			171,077			154,888			3,234			158,122
Segment operating income		140,267			3,376			143,643			84,716			1,548			86,264
Interest expense, net of amount capitalized		(89	)		(10,407	)		(10,496	)		(1,085	)		(17,956	)		(19,041	)
Income tax (provision)/ benefit		(22,600	)		1,011			(21,589	)		(18,863	)		3,504			(15,359	)
Segment profit/ (loss)		125,484			(5,309	)		120,175			66,880			(12,385	)		54,495
Total assets (at end of period)		13,248,321			646,880			13,895,201			11,716,530			213,355			11,929,885

	Noble-Cayman
	Three Months Ended March 31,
	2012									2011
	Contract									Contract
	Drilling									Drilling
	Services			Other			Total			Services			Other			Total
Revenues from external customers	$	781,243		$	16,447		$	797,690		$	564,654		$	14,234		$	578,888
Depreciation and amortization		167,948			2,625			170,573			154,888			2,767			157,655
Segment operating income		140,267			17,861			158,128			84,716			14,730			99,446
Interest expense, net of amount capitalized		(89	)		(10,407	)		(10,496	)		(1,085	)		(17,956	)		(19,041	)
Income tax (provision)/ benefit		(22,600	)		1,389			(21,211	)		(18,863	)		3,838			(15,025	)
Segment profit		125,484			9,168			134,652			66,880			780			67,660
Total assets (at end of period)		13,248,321			606,923			13,855,244			11,716,530			174,891			11,891,421

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Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Property and equipment, at cost
Property and equipment, at cost	$ 15,371,823	$ 15,037,112
Drilling equipment and facilities [Member]
Property and equipment, at cost
Property and equipment, at cost	11,277,790	10,471,877
Construction in progress [Member]
Property and equipment, at cost
Property and equipment, at cost	3,893,858	4,367,750
Other [Member]
Property and equipment, at cost
Property and equipment, at cost	$ 200,175	$ 197,485

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Derivative Instruments and Hedging Activities (Details Textual) (USD $)						3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2012 Forward Contracts [Member]	Mar. 31, 2012 Cash flow hedges [Member]
Derivative [Line Items]
Forward contracts settling in remainder of current year as percent of forecasted local currency requirements						10.00%
Total unrealized gains related to forward contracts and recorded as part of "Accumulated other comprehensive loss"	$ (644,000)	$ (3,061,000)	$ 1,766,000	$ 1,970,000	$ 600,000
Derivative Instruments and Hedging Activities (Textual) [Abstract]
Aggregate notional amount of forward contracts outstanding	$ 13,000,000

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Consolidated Balance Sheet (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 208,840	$ 239,196
Accounts receivable	738,835	587,163
Taxes receivable	95,308	75,284
Prepaid expenses	88,499	35,796
Other current assets	123,191	122,173
Total current assets	1,254,673	1,059,612
Property and equipment, at cost	15,371,823	15,037,112
Accumulated depreciation	(3,282,511)	(3,139,645)
Property and equipment, net	12,089,312	11,897,467
Other assets	551,216	538,080
Total assets	13,895,201	13,495,159
Current liabilities
Accounts payable	335,276	436,006
Accrued payroll and related costs	111,251	117,907
Interest payable	28,540	54,419
Taxes payable	97,179	94,920
Other current liabilities	108,911	123,928
Total current liabilities	681,157	827,180
Long-term debt	4,444,161	4,071,964
Deferred income taxes	240,341	242,791
Other liabilities	306,175	255,372
Total liabilities	5,671,834	5,397,307
Commitments and contingencies
Shareholders' equity
Shares; 252,730 and 252,639 shares outstanding	737,633	766,595
Treasury shares, at cost; 463 and 287 shares	(17,004)	(10,553)
Additional paid-in capital	52,180	48,356
Retained earnings	6,796,619	6,676,444
Accumulated other comprehensive loss	(70,560)	(74,321)
Total shareholders' equity	7,498,868	7,406,521
Noncontrolling interests	724,499	691,331
Total equity	8,223,367	8,097,852
Total liabilities and equity	13,895,201	13,495,159
Noble-Cayman [Member]
Current assets
Cash and cash equivalents	201,215	235,056
Accounts receivable	738,835	587,163
Taxes receivable	95,122	75,284
Prepaid expenses	86,241	33,105
Other current assets	122,297	120,109
Total current assets	1,243,710	1,050,717
Property and equipment, at cost	15,336,998	15,002,928
Accumulated depreciation	(3,276,762)	(3,134,401)
Property and equipment, net	12,060,236	11,868,527
Other assets	551,298	538,161
Total assets	13,855,244	13,457,405
Current liabilities
Accounts payable	334,289	435,729
Accrued payroll and related costs	102,091	108,908
Interest payable	28,540	54,419
Taxes payable	93,200	91,190
Other current liabilities	108,890	123,399
Total current liabilities	667,010	813,645
Long-term debt	4,444,161	4,071,964
Deferred income taxes	240,341	242,791
Other liabilities	306,175	255,372
Total liabilities	5,657,687	5,383,772
Commitments and contingencies
Shareholders' equity
Ordinary shares; 261,246 shares outstanding	26,125	26,125
Additional paid-in capital	455,686	450,616
Retained earnings	7,061,807	6,979,882
Accumulated other comprehensive loss	(70,560)	(74,321)
Total shareholders' equity	7,473,058	7,382,302
Noncontrolling interests	724,499	691,331
Total equity	8,197,557	8,073,633
Total liabilities and equity	$ 13,855,244	$ 13,457,405

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Debt (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Estimated fair value of our long-term debt
Total Long-term Debt, carrying Value	$ 4,444,161	$ 4,071,964
Total Long-term Debt, Estimated Fair Value	4,698,981	4,331,412
5.875% Senior Notes due 2013 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	299,957	299,949
Debt, Estimated Fair Value	316,003	317,586
7.375% Senior Notes due 2014 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	249,684	249,647
Debt, Estimated Fair Value	277,685	278,966
3.45% Senior Notes due 2015 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	350,000	350,000
Debt, Estimated Fair Value	367,520	363,571
3.05% senior notes due 2016 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	299,941	299,938
Debt, Estimated Fair Value	308,804	306,057
2.50% Senior Notes due 2017 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	299,827
Debt, Estimated Fair Value	301,653
Total Long-term Debt, carrying Value	299,827
7.50% Senior Notes due 2019 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	201,695	201,695
Debt, Estimated Fair Value	246,435	248,623
4.90% Senior Notes due 2020 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	498,811	498,783
Debt, Estimated Fair Value	536,850	531,437
4.625% senior notes due 2021 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	399,492	399,480
Debt, Estimated Fair Value	424,808	416,847
3.95% Senior Notes due 2022 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	399,035
Debt, Estimated Fair Value	400,535
Total Long-term Debt, carrying Value	399,035
6.20% Senior Notes due 2040 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	399,891	399,890
Debt, Estimated Fair Value	440,619	450,017
6.05% senior notes due 2041 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	397,590	397,582
Debt, Estimated Fair Value	433,771	443,308
5.25% Senior Notes due 2042 [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	498,238
Debt, Estimated Fair Value	494,298
Total Long-term Debt, carrying Value	498,238
Credit Facilities [Member]
Estimated fair value of our long-term debt
Debt, Carrying Value	150,000	975,000
Debt, Estimated Fair Value	$ 150,000	$ 975,000

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Consolidated Statement of Comprehensive Income (Parenthetical) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Tax provision on amortization of deferred pension plan amounts	$ 720	$ 353
Noble-Cayman [Member]
Tax provision on amortization of deferred pension plan amounts	$ 720	$ 353

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Guarantees of Registered Securities (Details 1) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Operating revenues
Contract drilling services		$ 746,310	$ 542,605
Reimbursables		35,141	22,291
Labor contract drilling services		16,008	13,547
Other		231	445
Total operating revenues		797,690	578,888
Operating costs and expenses
Contract drilling services		420,011	306,363
Reimbursables		30,601	17,103
Labor contract drilling services		9,232	8,523
Depreciation and amortization		171,077	158,122
Selling, general and administrative		23,126	23,715
Gain on contract extinguishments, net	(52,500)	(32,600)	(21,202)
Total operating costs and expenses		654,047	492,624
Operating income (loss)		143,643	86,264
Other income (expense)
Interest expense, net of amount capitalized		(10,496)	(19,041)
Interest income and other, net		1,785	2,592
Income before income taxes		134,932	69,815
Income tax provision		(21,589)	(15,359)
Net income		113,343	54,456
Net loss attributable to noncontrolling interests		6,832	39
Net income attributable to Noble Corporation		120,175	54,495
Other comprehensive income, net		3,761	3,488
Comprehensive income attributable to Noble Corporation		123,936	57,985
Noble-Cayman [Member]
Operating costs and expenses
Contract drilling services		1,188	1,461
Selling, general and administrative		357	1,511
Total operating costs and expenses		1,540	2,972
Operating income (loss)		(1,540)	(2,972)
Other income (expense)
Equity earnings in affiliates, net of tax		155,412	87,280
Interest expense, net of amount capitalized		(20,606)	(18,361)
Interest income and other, net		1,386	1,713
Income before income taxes		134,652	67,660
Net income		134,652	67,660
Net income attributable to Noble Corporation		134,652	67,660
Other comprehensive income, net		3,761	3,489
Comprehensive income attributable to Noble Corporation		138,413	71,149
Noble-Cayman [Member]
Operating revenues
Contract drilling services		746,310	542,605
Reimbursables		35,141	22,291
Labor contract drilling services		16,008	13,547
Other		231	445
Total operating revenues		797,690	578,888
Operating costs and expenses
Contract drilling services		415,146	300,832
Reimbursables		30,601	17,103
Labor contract drilling services		9,232	8,523
Depreciation and amortization		170,573	157,655
Selling, general and administrative		14,010	16,531
Gain on contract extinguishments, net			(21,202)
Total operating costs and expenses		639,562	479,442
Operating income (loss)		158,128	99,446
Other income (expense)
Interest expense, net of amount capitalized		(10,496)	(19,041)
Interest income and other, net		1,399	2,241
Income before income taxes		149,031	82,646
Income tax provision		(21,211)	(15,025)
Net income		127,820	67,621
Net loss attributable to noncontrolling interests		6,832	39
Net income attributable to Noble Corporation		134,652	67,660
Other comprehensive income, net		3,761	3,488
Net comprehensive loss attributable to noncontrolling interest			1
Comprehensive income attributable to Noble Corporation		138,413	71,150
NHC and NDH Combined [Member]
Operating revenues
Contract drilling services		42,991	25,964
Reimbursables		5,308	912
Total operating revenues		48,299	26,876
Operating costs and expenses
Contract drilling services		14,319	8,984
Reimbursables		5,087	904
Depreciation and amortization		14,839	10,124
Selling, general and administrative		1,346	1,509
Total operating costs and expenses		35,591	21,521
Operating income (loss)		12,708	5,355
Other income (expense)
Equity earnings in affiliates, net of tax		134,585	37,939
Interest expense, net of amount capitalized		(14,914)	(14,592)
Interest income and other, net		7,824	5,538
Income before income taxes		140,203	34,240
Income tax provision		(8,776)	(858)
Net income		131,427	33,382
Net income attributable to Noble Corporation		131,427	33,382
Comprehensive income attributable to Noble Corporation		131,427	33,382
NDC [Member]
Operating revenues
Contract drilling services		5,061	4,990
Reimbursables			12
Total operating revenues		5,061	5,002
Operating costs and expenses
Contract drilling services		1,771	1,823
Depreciation and amortization		1,036	909
Total operating costs and expenses		2,807	2,732
Operating income (loss)		2,254	2,270
Other income (expense)
Equity earnings in affiliates, net of tax		45,802	15,801
Interest expense, net of amount capitalized		(1,346)	(1,820)
Interest income and other, net		16	11
Income before income taxes		46,726	16,262
Net income		46,726	16,262
Net income attributable to Noble Corporation		46,726	16,262
Comprehensive income attributable to Noble Corporation		46,726	16,262
NHIL [Member]
Operating costs and expenses
Contract drilling services		17,633	8,570
Selling, general and administrative		8,819	7,877
Total operating costs and expenses		26,452	16,447
Operating income (loss)		(26,452)	(16,447)
Other income (expense)
Equity earnings in affiliates, net of tax		179,928	50,061
Interest expense, net of amount capitalized		(20,972)	(22,496)
Interest income and other, net		29,254	11,309
Income before income taxes		161,758	22,427
Net income		161,758	22,427
Net income attributable to Noble Corporation		161,758	22,427
Comprehensive income attributable to Noble Corporation		161,758	22,427
NDS6 [Member]
Other income (expense)
Equity earnings in affiliates, net of tax		75,861	35,820
Interest expense, net of amount capitalized		(7,783)	(7,671)
Interest income and other, net		3,110	1,792
Income before income taxes		71,188	29,941
Net income		71,188	29,941
Net income attributable to Noble Corporation		71,188	29,941
Comprehensive income attributable to Noble Corporation		71,188	29,941
Other Non-guarantor Subsidiaries of Noble [Member]
Operating revenues
Contract drilling services		718,076	523,594
Reimbursables		29,833	21,367
Labor contract drilling services		16,008	13,547
Other		231	445
Total operating revenues		764,148	558,953
Operating costs and expenses
Contract drilling services		400,058	291,937
Reimbursables		25,514	16,199
Labor contract drilling services		9,232	8,523
Depreciation and amortization		154,698	146,622
Selling, general and administrative		3,488	5,634
Gain on contract extinguishments, net			(21,202)
Total operating costs and expenses		592,990	447,713
Operating income (loss)		171,158	111,240
Other income (expense)
Interest expense, net of amount capitalized		(19,896)	(2,131)
Interest income and other, net		34,830	29,908
Income before income taxes		186,092	139,017
Income tax provision		(12,435)	(14,167)
Net income		173,657	124,850
Net loss attributable to noncontrolling interests		6,832	39
Net income attributable to Noble Corporation		180,489	124,889
Other comprehensive income, net		3,761	3,489
Net comprehensive loss attributable to noncontrolling interest			1
Comprehensive income attributable to Noble Corporation		184,250	128,379
Consolidating Adjustments [Member]
Operating revenues
Contract drilling services		(19,818)	(11,943)
Total operating revenues		(19,818)	(11,943)
Operating costs and expenses
Contract drilling services		(19,818)	(11,943)
Total operating costs and expenses		(19,818)	(11,943)
Other income (expense)
Equity earnings in affiliates, net of tax		(591,588)	(226,901)
Interest expense, net of amount capitalized		75,021	48,030
Interest income and other, net		(75,021)	(48,030)
Income before income taxes		(591,588)	(226,901)
Net income		(591,588)	(226,901)
Net income attributable to Noble Corporation		(591,588)	(226,901)
Other comprehensive income, net		(3,761)	(3,489)
Comprehensive income attributable to Noble Corporation		$ (595,349)	$ (230,390)

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Organization and Basis of Presentation (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 Rigs
Organization and Basis of Presentation (Textual) [Abstract]
Number of mobile offshore drilling units	79
Number of semisubmersibles	14
Number of drillships	14
Number of jackups	49
Number of submersibles	2
Number of Floating Production Storage and Offloading units ("FPSO")	1
Number of fleet units under construction	11
Number of ultra-deep water harsh environment drillships under construction	5
Number of Harsh Environment Jackup Rigs under Construction	6
Noble-Cayman [Member]
Public equity outstanding	0

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Accounting Pronouncements

3 Months Ended

Mar. 31, 2012

Accounting Pronouncements [Abstract]

Accounting Pronouncements

Note 14 — Accounting Pronouncements

In May 2011, the FASB issued Accounting Standards Update (“ASU”) No. 2011-04, which amends FASB Accounting Standards Codification (“ASC”) Topic 820, “Fair Value Measurements and Disclosures.” This amended guidance clarifies the wording used to describe many of the requirements in accounting literature for measuring fair value and for disclosing information about fair value measurements. The goal of the amendment is to create consistency between the United States and international accounting standards. The guidance is effective for annual and interim reporting periods beginning on or after December 15, 2011. Our adoption of this guidance did not have a material impact on our financial condition, results of operations, cash flows or financial disclosures.

In June 2011, the FASB issued ASU No. 2011-05, which amends ASC Topic 220, “Comprehensive Income.” This ASU allows an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendment no longer allows an entity to show changes to other comprehensive income solely through the statement of equity. For publicly traded entities, the guidance is effective for annual and interim reporting periods beginning on or after December 15, 2011. Our adoption of this guidance did not have a material impact on our financial condition, results of operations, cash flows or financial disclosures.

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Consolidated Joint Ventures (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 Rigs JointVentures	Apr. 30, 2011
Consolidated Joint Ventures (Textual) [Abstract]
Percent of Interest in Joint ventures	50.00%
Number of joint ventures acquired	2
Number of bully class drillships	2
Capital call on joint venture		$ 360,000,000
Additional capital contributed	0
Carrying amount of the drillships	$ 1,400,000,000

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Guarantees of Registered Securities

3 Months Ended

Mar. 31, 2012

Guarantees of Registered Securities [Abstract]

Guarantees of Registered Securities

Note 16 — Guarantees of Registered Securities

Noble-Cayman or one or more subsidiaries of Noble-Cayman are a co-issuer or guarantor or otherwise obligated as of March 31, 2012 as follows:

	Issuer
Notes	(Co-Issuer(s))	Guarantor(s)
$300 million 5.875% Senior Notes due 2013	Noble-Cayman	Noble Drilling Corporation ("NDC");
		NHIL
$250 million 7.375% Senior Notes due 2014	NHIL	Noble-Cayman
$350 million 3.45% Senior Notes due 2015	NHIL	Noble-Cayman
$300 million 3.05% Senior Notes due 2016	NHIL	Noble-Cayman
$300 million 2.50% Senior Notes due 2017	NHIL	Noble-Cayman
$202 million 7.50% Senior Notes due 2019	NDC;	Noble-Cayman;
	Noble Drilling Holding LLC ("NDH");	Noble Holding (U.S.) Corporation ("NHC")
	Noble Drilling Services 6 LLC ("NDS6")
$500 million 4.90% Senior Notes due 2020	NHIL	Noble-Cayman
$400 million 4.625% Senior Notes due 2021	NHIL	Noble-Cayman
$400 million 3.95% Senior Notes due 2022	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

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

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

March 31, 2012

(in thousands)

													Other
													Non-guarantor
	Noble-		NHC and NDH										Subsidiaries			Consolidating
	Cayman		Combined			NDC			NHIL		NDS6		of Noble			Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	24,973	$	264		$	—		$	4	$	—	$	175,974		$	—		$	201,215
Accounts receivable		—		15,427			1,766			—		—		721,642			—			738,835
Taxes receivable		—		4,566			—			—		—		90,556			—			95,122
Prepaid expenses		—		412			20			—		—		85,809			—			86,241
Short-term notes receivable from affiliates		27,695		119,476			—			—		—		122,298			(269,469	)		—
Accounts receivable from affiliates		798,994		107,014			928,971			126,978		37,014		5,337,669			(7,336,640	)		—
Other current assets		—		640			196			—		—		121,461			—			122,297
Total current assets		851,662		247,799			930,953			126,982		37,014		6,655,409			(7,606,109	)		1,243,710
Property and equipment, at cost		—		2,277,714			71,180			—		—		12,988,104			—			15,336,998
Accumulated depreciation		—		(260,120	)		(53,732	)		—		—		(2,962,910	)		—			(3,276,762	)
Property and equipment, net		—		2,017,594			17,448			—		—		10,025,194			—			12,060,236
Notes receivable from affiliates		3,816,462		1,206,000			—			3,524,814		479,107		2,618,720			(11,645,103	)		—
Investments in affiliates		7,124,613		9,273,599			3,452,360			6,785,699		2,129,404		—			(28,765,675	)		—
Other assets		2,803		7,172			2,356			28,266		850		509,851			—			551,298
Total assets	$	11,795,540	$	12,752,164		$	4,403,117		$	10,465,761	$	2,646,375	$	19,809,174		$	(48,016,887	)	$	13,855,244
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables from affiliates	$	72,298	$	50,000		$	—		$	—	$	—	$	147,171		$	(269,469	)	$	—
Accounts payable		—		3,233			552			—		—		330,504			—			334,289
Accrued payroll and related costs		—		3,803			7,731			—		—		90,557			—			102,091
Accounts payable to affiliates		918,227		4,289,177			28,688			125,867		45,641		1,929,040			(7,336,640	)		—
Interest payable		5,965		—			—			21,945		630		—			—			28,540
Taxes payable		—		10,624			—			—		—		82,576			—			93,200
Other current liabilities		—		—			240			—		—		108,650			—			108,890
Total current liabilities		996,490		4,356,837			37,211			147,812		46,271		2,688,498			(7,606,109	)		667,010
Long-term debt		449,957		—			—			3,792,509		201,695		—			—			4,444,161
Notes payable to affiliates		2,856,106		994,500			85,000			975,000		1,342,000		5,392,497			(11,645,103	)		—
Deferred income taxes		—		—			15,731			—		—		224,610			—			240,341
Other liabilities		19,929		26,919			—			—		—		259,327			—			306,175
Total liabilities		4,322,482		5,378,256			137,942			4,915,321		1,589,966		8,564,932			(19,251,212	)		5,657,687
Commitments and contingencies
Total shareholder equity		7,473,058		7,373,908			4,265,175			5,550,440		1,056,409		10,519,743			(28,765,675	)		7,473,058
Noncontrolling interest		—		—			—			—		—		724,499			—			724,499
Total equity		7,473,058		7,373,908			4,265,175			5,550,440		1,056,409		11,244,242			(28,765,675	)		8,197,557
Total liabilities and equity	$	11,795,540	$	12,752,164		$	4,403,117		$	10,465,761	$	2,646,375	$	19,809,174		$	(48,016,887	)	$	13,855,244

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2011

(in thousands)

													Other
													Non-guarantor
	Noble-		NHC and NDH										Subsidiaries			Consolidating
	Cayman		Combined			NDC			NHIL		NDS6		of Noble			Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	146	$	385		$	—		$	—	$	—	$	234,525		$	—		$	235,056
Accounts receivable		—		10,810			3,371			—		—		572,982			—			587,163
Taxes receivable		—		4,566			—			—		—		70,718			—			75,284
Prepaid expenses		—		453			19			—		—		32,633			—			33,105
Short-term notes receivable from affiliates		—		119,476			—			—		—		122,298			(241,774	)		—
Accounts receivable from affiliates		1,683,740		99,202			879,581			159,132		33,905		6,372,657			(9,228,217	)		—
Other current assets		—		643			196			93		—		119,177			—			120,109
Total current assets		1,683,886		235,535			883,167			159,225		33,905		7,524,990			(9,469,991	)		1,050,717
Property and equipment, at cost		—		2,718,186			71,381			—		—		12,213,361			—			15,002,928
Accumulated depreciation		—		(220,662	)		(53,037	)		—		—		(2,860,702	)		—			(3,134,401	)
Property and equipment, net		—		2,497,524			18,344			—		—		9,352,659			—			11,868,527
Notes receivable from affiliates		3,842,062		675,000			—			2,336,527		572,107		2,678,192			(10,103,888	)		—
Investments in affiliates		6,969,201		9,101,938			3,450,212			6,605,771		2,141,450		—			(28,268,572	)		—
Other assets		3,230		8,092			2,541			18,548		880		504,870			—			538,161
Total assets	$	12,498,379	$	12,518,089		$	4,354,264		$	9,120,071	$	2,748,342	$	20,060,711		$	(47,842,451	)	$	13,457,405
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables from affiliates	$	72,298	$	50,000		$	—		$	—	$	—	$	119,476		$	(241,774	)	$	—
Accounts payable		—		5,577			985			—		—		429,167			—			435,729
Accrued payroll and related costs		—		2,897			6,518			—		—		99,493			—			108,908
Accounts payable to affiliates		2,079,719		4,166,021			27,341			112,953		34,107		2,808,076			(9,228,217	)		—
Interest payable		1,891		—			—			48,116		4,412		—			—			54,419
Taxes payable		—		10,032			—			—		—		81,158			—			91,190
Other current liabilities		—		—			240			—		—		123,159			—			123,399
Total current liabilities		2,153,908		4,234,527			35,084			161,069		38,519		3,660,529			(9,469,991	)		813,645
Long-term debt		1,274,949		—			—			2,595,320		201,695		—			—			4,071,964
Notes payable to affiliates		1,667,291		1,147,500			85,000			975,000		811,000		5,418,097			(10,103,888	)		—
Deferred income taxes		—		—			15,731			—		—		227,060			—			242,791
Other liabilities		19,929		24,878			—			—		—		210,565			—			255,372
Total liabilities		5,116,077		5,406,905			135,815			3,731,389		1,051,214		9,516,251			(19,573,879	)		5,383,772
Commitments and contingencies
Total shareholder equity		7,382,302		7,111,184			4,218,449			5,388,682		1,697,128		9,853,129			(28,268,572	)		7,382,302
Noncontrolling interest		—		—			—			—		—		691,331			—			691,331
Total equity		7,382,302		7,111,184			4,218,449			5,388,682		1,697,128		10,544,460			(28,268,572	)		8,073,633
Total liabilities and equity	$	12,498,379	$	12,518,089		$	4,354,264		$	9,120,071	$	2,748,342	$	20,060,711		$	(47,842,451	)	$	13,457,405

CONDENSED CONSOLIDATING STATEMENT OF INCOME

Three Months Ended March 31, 2012

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	42,991		$	5,061		$	—		$	—		$	718,076		$	(19,818	)	$	746,310
Reimbursables		—			5,308			—			—			—			29,833			—			35,141
Labor contract drilling services		—			—			—			—			—			16,008			—			16,008
Other		—			—			—			—			—			231			—			231
Total operating revenues		—			48,299			5,061			—			—			764,148			(19,818	)		797,690
Operating costs and expenses
Contract drilling services		1,183			14,319			1,771			17,633			—			400,058			(19,818	)		415,146
Reimbursables		—			5,087			—			—			—			25,514			—			30,601
Labor contract drilling services		—			—			—			—			—			9,232			—			9,232
Depreciation and amortization		—			14,839			1,036			—			—			154,698			—			170,573
Selling, general and administrative		357			1,346			—			8,819			—			3,488			—			14,010
Total operating costs and expenses		1,540			35,591			2,807			26,452			—			592,990			(19,818	)		639,562
Operating income (loss)		(1,540	)		12,708			2,254			(26,452	)		—			171,158			—			158,128
Other income (expense)
Equity earnings in affiliates, net of tax		155,412			134,585			45,802			179,928			75,861			—			(591,588	)		—
Interest expense, net of amounts capitalized		(20,606	)		(14,914	)		(1,346	)		(20,972	)		(7,783	)		(19,896	)		75,021			(10,496	)
Interest income and other, net		1,386			7,824			16			29,254			3,110			34,830			(75,021	)		1,399
Income before income taxes		134,652			140,203			46,726			161,758			71,188			186,092			(591,588	)		149,031
Income tax provision		—			(8,776	)		—			—			—			(12,435	)		—			(21,211	)
Net Income		134,652			131,427			46,726			161,758			71,188			173,657			(591,588	)		127,820
Net loss attributable to noncontrolling interests		—			—			—			—			—			6,832			—			6,832
Net income attributable to Noble Corporation		134,652			131,427			46,726			161,758			71,188			180,489			(591,588	)		134,652
Other comprehensive income, net		3,761			—			—			—			—			3,761			(3,761	)		3,761
Comprehensive income attributable to Noble Corporation	$	138,413		$	131,427		$	46,726		$	161,758		$	71,188		$	184,250		$	(595,349	)	$	138,413

CONDENSED CONSOLIDATING STATEMENT OF INCOME

Three Months Ended March 31, 2011

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	25,964		$	4,990		$	—		$	—		$	523,594		$	(11,943	)	$	542,605
Reimbursables		—			912			12			—			—			21,367			—			22,291
Labor contract drilling services		—			—			—			—			—			13,547			—			13,547
Other		—			—			—			—			—			445			—			445
Total operating revenues		—			26,876			5,002			—			—			558,953			(11,943	)		578,888
Operating costs and expenses
Contract drilling services		1,461			8,984			1,823			8,570			—			291,937			(11,943	)		300,832
Reimbursables		—			904			—			—			—			16,199			—			17,103
Labor contract drilling services		—			—			—			—			—			8,523			—			8,523
Depreciation and amortization		—			10,124			909			—			—			146,622			—			157,655
Selling, general and administrative		1,511			1,509			—			7,877			—			5,634			—			16,531
Gain on contract extinguishments, net		—			—			—			—			—			(21,202	)		—			(21,202	)
Total operating costs and expenses		2,972			21,521			2,732			16,447			—			447,713			(11,943	)		479,442
Operating income (loss)		(2,972	)		5,355			2,270			(16,447	)		—			111,240			—			99,446
Other income (expense)
Equity earnings in affiliates, net of tax		87,280			37,939			15,801			50,061			35,820			—			(226,901	)		—
Interest expense, net of amounts capitalized		(18,361	)		(14,592	)		(1,820	)		(22,496	)		(7,671	)		(2,131	)		48,030			(19,041	)
Interest income and other, net		1,713			5,538			11			11,309			1,792			29,908			(48,030	)		2,241
Income before income taxes		67,660			34,240			16,262			22,427			29,941			139,017			(226,901	)		82,646
Income tax provision		—			(858	)		—			—			—			(14,167	)		—			(15,025	)
Net Income		67,660			33,382			16,262			22,427			29,941			124,850			(226,901	)		67,621
Net loss attributable to noncontrolling interests		—			—			—			—			—			39			—			39
Net income attributable to Noble Corporation		67,660			33,382			16,262			22,427			29,941			124,889			(226,901	)		67,660
Other comprehensive income, net		3,489			—			—			—			—			3,489			(3,489	)		3,489
Net comprehensive loss attributable to noncontrolling interest		—			—			—			—			—			1			—			1
Comprehensive income attributable to Noble Corporation	$	71,149		$	33,382		$	16,262		$	22,427		$	29,941		$	128,379		$	(230,390	)	$	71,150

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Three Months Ended March 31, 2012

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Cash flows from operating activities
Net cash from operating activities	$	(11,189	)	$	9,223		$	4,529		$	(53,966	)	$	(8,425	)	$	171,796		$	—		$	111,968
Cash flows from investing activities
Capital expenditures		—			(136,890	)		—			—			—			(230,435	)		—			(367,325	)
Change in accrued capital expenditures		—			—			—			—			—			(127,393	)		—			(127,393	)
Notes receivable from affiliates		—			—			—			(1,188,287	)		—			—			1,188,287			—
Net cash from investing activities		—			(136,890	)		—			(1,188,287	)		—			(357,828	)		1,188,287			(494,718	)
Cash flows from financing activities
Borrowings on bank credit facilities		365,000			—			—			—			—			—			—			365,000
Repayments on bank credit facilities		(1,190,000	)		—			—			—			—			—			—			(1,190,000	)
Proceeds from issuance of senior notes, net		—			—			—			1,186,636			—			—			—			1,186,636
Contributions from joint venture partners		—			—			—			—			—			40,000			—			40,000
Distributions to parent		(52,727	)		—			—			—			—			—			—			(52,727	)
Advances (to) from affiliates		(274,544	)		127,546			(4,529	)		55,621			8,425			87,481			—			—
Notes payable to affiliates		1,188,287			—			—			—			—			—			(1,188,287	)		—
Net cash from financing activities		36,016			127,546			(4,529	)		1,242,257			8,425			127,481			(1,188,287	)		348,909
Net change in cash and cash equivalents		24,827			(121	)		—			4			—			(58,551	)		—			(33,841	)
Cash and cash equivalents, beginning of period		146			385			—			—			—			234,525			—			235,056
Cash and cash equivalents, end of period	$	24,973		$	264		$	—		$	4		$	—		$	175,974		$	—		$	201,215

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Three Months Ended March 31, 2011

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Cash flows from operating activities
Net cash from operating activities	$	(12,580	)	$	6,411		$	2,762		$	(48,978	)	$	(9,633	)	$	155,517		$	—		$	93,499
Cash flows from investing activities
Capital expenditures		—			(318,916	)		—			—			—			(290,685	)		—			(609,601	)
Change in accrued capital expenditures		—			—			—			—			—			(471	)		—			(471	)
Notes receivable from affiliates		—			—			—			—			—			2,000			(2,000	)		—
Refund from contract extinguishments		—			—			—			—			—			18,642			—			18,642
Net cash from investing activities		—			(318,916	)		—			—			—			(270,514	)		(2,000	)		(591,430	)
Cash flows from financing activities
Borrowings on bank credit facilities		200,000			—			—			—			—			—			—			200,000
Repayments on bank credit facilities		(240,000	)		—			—			—			—			—			—			(240,000	)
Proceeds from issuance of senior notes, net		—			—			—			1,087,833			—			—			—			1,087,833
Contributions from joint venture partners		—			—			—			—			—			396,000			—			396,000
Payments of joint venture debt		—			—			—			—			—			(693,494	)		—			(693,494	)
Settlement of interest rate swaps		—			—			—			—			—			(29,032	)		—			(29,032	)
Financing costs on credit facilities		(2,835	)		—			—			—			—			—			—			(2,835	)
Distributions to parent		(52,889	)		—			—			—			—			—			—			(52,889	)
Advances (to) from affiliates		92,838			330,187			(2,762	)		(1,038,855	)		9,633			608,959			—			—
Notes payable to affiliates		15,500			(17,500	)		—			—			—			—			2,000			—
Net cash from financing activities		12,614			312,687			(2,762	)		48,978			9,633			282,433			2,000			665,583
Net change in cash and cash equivalents		34			182			—			—			—			167,436			—			167,652
Cash and cash equivalents, beginning of period		42			146			—			—			—			333,211			—			333,399
Cash and cash equivalents, end of period	$	76		$	328		$	—		$	—		$	—		$	500,647		$	—		$	501,051

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Consolidated Statement of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net income	$ 113,343	$ 54,456
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	171,077	158,122
Gain on contract extinguishments, net	(32,600)	(21,202)
Deferred income taxes	(4,075)	2,819
Amortization of share-based compensation	8,753	8,271
Net change in other assets and liabilities	(185,390)	(115,692)
Net cash from operating activities	103,708	86,774
Cash flows from investing activities
Capital expenditures	(367,965)	(614,324)
Change in accrued capital expenditures	(127,393)	(471)
Refund from contract extinguishments		18,642
Net cash from investing activities	(495,358)	(596,153)
Cash flows from financing activities
Borrowings on bank credit facilities	365,000	200,000
Repayments on bank credit facilities	(1,190,000)	(240,000)
Proceeds from issuance of senior notes, net of debt issuance costs	1,186,636	1,087,833
Contributions from joint venture partners	40,000	396,000
Payments of joint venture debt		(693,494)
Settlement of interest rate swaps		(29,032)
Par value reduction payments	(36,370)	(34,920)
Financing costs on credit facilities		(2,835)
Proceeds from employee stock transactions	2,479	2,337
Repurchases of employee shares surrendered for taxes	(6,451)	(5,700)
Net cash from financing activities	361,294	680,189
Net change in cash and cash equivalents	(30,356)	170,810
Cash and cash equivalents, beginning of period	239,196	337,871
Cash and cash equivalents, end of period	208,840	508,681
Noble-Cayman [Member]
Cash flows from operating activities
Net income	127,820	67,621
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	170,573	157,655
Gain on contract extinguishments, net		(21,202)
Deferred income taxes	(4,075)	2,819
Capital contribution by parent - share-based compensation	5,070	5,151
Net change in other assets and liabilities	(187,420)	(118,545)
Net cash from operating activities	111,968	93,499
Cash flows from investing activities
Capital expenditures	(367,325)	(609,601)
Change in accrued capital expenditures	(127,393)	(471)
Refund from contract extinguishments		18,642
Net cash from investing activities	(494,718)	(591,430)
Cash flows from financing activities
Borrowings on bank credit facilities	365,000	200,000
Repayments on bank credit facilities	(1,190,000)	(240,000)
Proceeds from issuance of senior notes, net of debt issuance costs	1,186,636	1,087,833
Contributions from joint venture partners	40,000	396,000
Payments of joint venture debt		(693,494)
Settlement of interest rate swaps		(29,032)
Financing costs on credit facilities		(2,835)
Distributions to parent company, net	(52,727)	(52,889)
Net cash from financing activities	348,909	665,583
Net change in cash and cash equivalents	(33,841)	167,652
Cash and cash equivalents, beginning of period	235,056	333,399
Cash and cash equivalents, end of period	$ 201,215	$ 501,051

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Consolidated Balance Sheet (Parenthetical) (Unaudited) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Shares, shares outstanding	252,730	252,639
Ordinary shares, shares outstanding	252,267	252,352
Treasury stock, shares	463	287
Noble-Cayman [Member]
Ordinary shares, shares outstanding	261,246	261,246

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Employee Benefit Plans

3 Months Ended

Mar. 31, 2012

Employee Benefit Plans [Abstract]

Employee Benefit Plans

Note 9 — Employee Benefit Plans

Pension costs include the following components:

	Three Months Ended March 31,
	2012						2011
	Non-U.S.			U.S.			Non-U.S.			U.S.
Service cost	$	1,123		$	2,431		$	1,093		$	2,152
Interest cost		1,358			2,196			1,383			2,143
Return on plan assets		(1,346	)		(2,793	)		(1,403	)		(2,768	)
Amortization of prior service cost		—			57			—			56
Amortization of transition obligation		—			—			18			—
Recognized net actuarial loss		200			1,885			120			844
Net pension expense	$	1,335		$	3,776		$	1,211		$	2,427

During the three months ended March 31, 2012 and 2011, we made contributions to our pension plans totaling $4 million and $2 million, respectively. We expect the funding to our non-U.S. and U.S. plans in 2012, subject to applicable law, to be approximately $19 million.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2012	Apr. 30, 2012
Entity Registrant Name	Noble Corp / Switzerland
Entity Central Index Key	0001458891
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		252,387,216
Noble-Cayman [Member]
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		261,245,693

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Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2012

Derivative Instruments and Hedging Activities [Abstract]

Derivative Instruments and Hedging Activities

Note 10 — 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. During the three months ended March 31, 2011, we maintained certain foreign currency forward contracts that did not qualify under the Financial Accounting Standards Board (“FASB”) standards for hedge accounting treatment and therefore, changes in fair values were recognized as either income or loss in our consolidated income statement.

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. For interest rate swaps, we evaluate all material terms between the swap and the underlying debt obligation, known in FASB standards as the “long-haul method.” Any change in fair value resulting from ineffectiveness is recognized immediately in earnings.

Cash Flow Hedges

Our North Sea and Brazil operations have a significant amount of their cash operating expenses payable in local currencies. To limit the potential risk of currency fluctuations, we typically maintain short-term forward contracts settling monthly in their respective local currencies. The forward contract settlements in the remainder of 2012 represent approximately 10 percent of these forecasted local currency requirements. The notional amount of the forward contracts outstanding, expressed in U.S. Dollars, was approximately $13 million at March 31, 2012. Total unrealized loss related to these forward contracts was $0.6 million as of March 31, 2012 and was recorded as part of “Accumulated other comprehensive loss” (“AOCL”).

The balance of the net unrealized gain/(loss) related to our cash flow hedges included in AOCL and related activity is as follows:

	Three Months Ended
	March 31,
	2012			2011
Net unrealized gain/(loss) at beginning of period	$	(3,061	)	$	1,970
Activity during period:
Settlement of foreign currency forward contracts during the period		2,118			(1,152	)
Settlement of interest rate swaps during the period		—			(366	)
Net unrealized gain on outstanding foreign currency forward contracts		299			1,314
Net unrealized gain/(loss) at end of period	$	(644	)	$	1,766

Financial Statement Presentation

The following tables, together with Note 11, summarize the financial statement presentation and fair value of our derivative positions as of March 31, 2012 and December 31, 2011:

			Estimated fair value
	Balance  sheet classification		March 31, 2012		December 31, 2011
Liability derivatives
Cash flow hedges
Short-term foreign currency forward contracts		Other current liabilities	$	644	$	3,061

To supplement the fair value disclosures in Note 11, the following summarizes the recognized gains and losses of cash flow hedges and non-designated derivatives through AOCL or through “other income” for the three months ended March 31, 2012 and 2011:

	Gain/(loss) recognized through AOCL				Gain/(loss) reclassified from AOCL to  “other income”					Gain/(loss) recognized through “other income”
	2012		2011		2012			2011		2012		2011
Cash flow hedges
Foreign currency forward contracts	$	299	$	1,314	$	(2,118	)	$	1,152	$	—	$	—
Non-designated derivatives
Foreign currency forward contracts	$	—	$	—	$	—		$	—	$	—	$	(546	)

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Consolidated Statement of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Operating revenues
Contract drilling services		$ 746,310	$ 542,605
Reimbursables		35,141	22,291
Labor contract drilling services		16,008	13,547
Other		231	445
Total operating revenues		797,690	578,888
Operating costs and expenses
Contract drilling services		420,011	306,363
Reimbursables		30,601	17,103
Labor contract drilling services		9,232	8,523
Depreciation and amortization		171,077	158,122
Selling, general and administrative		23,126	23,715
Gain on contract extinguishments, net	(52,500)	(32,600)	(21,202)
Total operating costs and expenses		654,047	492,624
Operating income		143,643	86,264
Other income (expense)
Interest expense, net of amount capitalized		(10,496)	(19,041)
Interest income and other, net		1,785	2,592
Income before income taxes		134,932	69,815
Income tax provision		(21,589)	(15,359)
Net income		113,343	54,456
Net loss attributable to noncontrolling interests		6,832	39
Net income attributable to Noble Corporation		120,175	54,495
Net income per share
Basic		$ 0.47	$ 0.22
Diluted		$ 0.47	$ 0.21
Noble-Cayman [Member]
Operating revenues
Contract drilling services		746,310	542,605
Reimbursables		35,141	22,291
Labor contract drilling services		16,008	13,547
Other		231	445
Total operating revenues		797,690	578,888
Operating costs and expenses
Contract drilling services		415,146	300,832
Reimbursables		30,601	17,103
Labor contract drilling services		9,232	8,523
Depreciation and amortization		170,573	157,655
Selling, general and administrative		14,010	16,531
Gain on contract extinguishments, net			(21,202)
Total operating costs and expenses		639,562	479,442
Operating income		158,128	99,446
Other income (expense)
Interest expense, net of amount capitalized		(10,496)	(19,041)
Interest income and other, net		1,399	2,241
Income before income taxes		149,031	82,646
Income tax provision		(21,211)	(15,025)
Net income		127,820	67,621
Net loss attributable to noncontrolling interests		6,832	39
Net income attributable to Noble Corporation		$ 134,652	$ 67,660

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Property and Equipment

3 Months Ended

Mar. 31, 2012

Property and Equipment [Abstract]

Property and Equipment

Note 4 — Property and Equipment

Property and equipment, at cost, as of March 31, 2012 and December 31, 2011 consisted of the following:

	March 31, 2012		December 31, 2011
Drilling equipment and facilities	$	11,277,790	$	10,471,877
Construction in progress		3,893,858		4,367,750
Other		200,175		197,485
	$	15,371,823	$	15,037,112

Capital expenditures, including capitalized interest, totaled $368 million and $614 million for the three months ended March 31, 2012 and 2011, respectively. Capital expenditures for 2012 consisted of the following:

• $133 million for newbuild construction;

• $147 million for major projects, including $25 million in subsea related expenditures and $25 million to upgrade two drillships currently operating in Brazil;

• $47 million for other capitalized expenditures, including major maintenance and regulatory expenditures which generally have useful lives ranging from 3 to 5 years; and

• $41 million in capitalized interest.

Interest is capitalized on construction-in-progress at the weighted average cost of debt outstanding during the period of construction. Capitalized interest was $41 million and $27 million for the three months ended March 31, 2012 and 2011, respectively.

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Share Data

3 Months Ended

Mar. 31, 2012

Share Data [Abstract]

Share Data

Note 3 — Share Data

Share capital

The following is a detail of Noble-Swiss’ share capital as of March 31, 2012 and December 31, 2011:

	March 31, 2012		December 31, 2011
Shares outstanding and trading		252,267		252,352
Treasury shares		463		287
Total shares outstanding		252,730		252,639
Treasury shares held for share-based compensation plans		13,420		13,511
Total shares authorized for issuance		266,150		266,150
Par value per share (in Swiss Francs)		3.28		3.41

Shares authorized for issuance by Noble-Swiss at March 31, 2012 totaled 266.2 million shares and include 0.5 million shares held in treasury and 13.4 million treasury shares held by a wholly-owned subsidiary. Repurchased treasury shares are recorded at cost, and include shares repurchased pursuant to our approved share repurchase program discussed below and shares surrendered by employees for taxes payable upon the vesting of restricted stock.

Share repurchases are made pursuant to the share repurchase program that our Board of Directors authorized and adopted. All shares repurchased under our share repurchase program are held in treasury. The number of shares that we may hold in treasury is limited under Swiss law. At March 31, 2012, 6.8 million shares remained available for repurchase under previous authorization by the Board of Directors. No shares were repurchased under this authorization during the three months ended March 31, 2012.

Our Board of Directors may further increase Noble-Swiss’ share capital through the issuance of up to 133.1 million authorized registered shares without obtaining shareholder approval. The issuance of these authorized registered shares is subject to certain conditions regarding their use.

In April 2012, our shareholders approved the payment of a dividend funded from capital contribution reserve in a total amount equal to $0.52 per share to be paid in four equal installments scheduled for August 2012, November 2012, February 2013 and May 2013. These dividends will require us to make total cash payments of approximately $66 million in 2012, based on the number of shares currently outstanding. In connection with this approval, during the second quarter of 2012, we will record a payable of approximately $133 million, which represents this obligation to shareholders. Any additional issuances of shares would further increase this obligation.

Earnings per share

The following table sets forth the computation of basic and diluted earnings per share for Noble-Swiss:

	Three months ended March 31,
	2012			2011
Allocation of net income
Basic
Net income attributable to Noble Corporation	$	120,175		$	54,495
Earnings allocated to unvested share-based payment awards		(1,126	)		(509	)
Net income to common shareholders—basic	$	119,049		$	53,986
Diluted
Net income attributable to Noble Corporation	$	120,175		$	54,495
Earnings allocated to unvested share-based payment awards		(1,125	)		(509	)
Net income to common shareholders—diluted	$	119,050		$	53,986
Weighted average shares outstanding—basic		251,971			251,026
Incremental shares issuable from assumed exercise of stock options		491			775
Weighted average shares outstanding—diluted		252,462			251,801
Weighted average unvested share-based payment awards		2,407			2,419
Earnings per share
Basic	$	0.47		$	0.22
Diluted	$	0.47		$	0.21

Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. At March 31, 2012, stock options totaling approximately 1.2 million were excluded from the diluted earnings per share as they were not dilutive as compared to 0.7 million at March 31, 2011.

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Net Change in Other Assets and Liabilities

3 Months Ended

Mar. 31, 2012

Net Change in Other Assets and Liabilities [Abstract]

Net Change in Other Assets and Liabilities

Note 15 — Net Change in Other Assets and Liabilities

The net effect of changes in other assets and liabilities on cash flows from Noble-Swiss’ operating activities are as follows:

	Three months ended
	March 31,
	2012			2011
Accounts receivable	$	(88,969	)	$	(58,461	)
Other current assets		(71,328	)		(64,003	)
Other assets		5,148			4,611
Accounts payable		7,014			1,864
Other current liabilities		(31,789	)		(18,626	)
Other liabilities		(5,466	)		18,923
	$	(185,390	)	$	(115,692	)

The net effect of changes in other assets and liabilities on cash flows from Noble-Cayman’s operating activities are as follows:

	Three months ended
	March 31,
	2012			2011
Accounts receivable	$	(88,969	)	$	(58,461	)
Other current assets		(72,745	)		(65,318	)
Other assets		5,147			2,132
Accounts payable		6,304			1,805
Other current liabilities		(31,691	)		(17,602	)
Other liabilities		(5,466	)		18,899
	$	(187,420	)	$	(118,545	)

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Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2012

Fair Value of Financial Instruments [Abstract]

Fair Value of Financial Instruments

Note 11 — Fair Value of Financial Instruments

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

	March 31, 2012								December 31, 2011
			Estimated Fair Value Measurements
	Carrying Amount		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Carrying Amount		Estimated Fair Value
Assets—
Marketable securities	$	5,346	$	5,346	$	—	$	—	$	4,701	$	4,701
Liabilities—
Foreign currency forward contracts	$	644	$	—	$	644	$	—	$	3,061	$	3,061

The derivative instruments have been valued using actively quoted prices and quotes obtained from the counterparties to the derivative instruments. Our cash and cash equivalents, accounts receivable 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.

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Debt

3 Months Ended

Mar. 31, 2012

Debt [Abstract]

Debt

Note 7 — Debt

Total debt consisted of the following at March 31, 2012 and December 31, 2011:

	March 31, 2012		December 31, 2011
Wholly-owned debt instruments:
5.875% Senior Notes due 2013	$	299,957	$	299,949
7.375% Senior Notes due 2014		249,684		249,647
3.45% Senior Notes due 2015		350,000		350,000
3.05% Senior Notes due 2016		299,941		299,938
2.50% Senior Notes due 2017		299,827		—
7.50% Senior Notes due 2019		201,695		201,695
4.90% Senior Notes due 2020		498,811		498,783
4.625% Senior Notes due 2021		399,492		399,480
3.95% Senior Notes due 2022		399,035		—
6.20% Senior Notes due 2040		399,891		399,890
6.05% Senior Notes due 2041		397,590		397,582
5.25% Senior Notes due 2042		498,238		—
Credit facilities		150,000		975,000
Total long-term debt	$	4,444,161	$	4,071,964

We have two separate revolving credit facilities in place which provide us with a total borrowing capacity of approximately $1.18 billion. One credit facility, which has a capacity of $575 million, matures in 2013, and the other facility, which has a capacity of $600 million, matures in 2015 (together referred to as the “Credit Facilities”). The covenants and events of default under the Credit Facilities are substantially similar, and each facility contains a covenant that limits our ratio of debt to total tangible capitalization, as defined in the Credit Facilities, to 0.60. At March 31, 2012, our ratio of debt to total tangible capitalization was less than 0.36 for the Credit Facilities. We were in compliance with all covenants under the Credit Facilities as of March 31, 2012.

The Credit Facilities provide us with the ability to issue up to $300 million in letters of credit in the aggregate. While the issuance of letters of credit does not increase our borrowings outstanding under the Credit Facilities, it does reduce the amount available. At March 31, 2012, we had no letters of credit outstanding under the Credit Facilities.

In February 2012, we issued, through our indirect wholly-owned subsidiary, Noble Holding International Limited (“NHIL”), $1.2 billion aggregate principal amount of senior notes in three separate tranches, with $300 million of 2.50% Senior Notes due 2017, $400 million of 3.95% Senior Notes due 2022, and $500 million of 5.25% Senior Notes due 2042. The weighted average coupon of all three tranches is 4.13%. The net proceeds of approximately $1.19 billion, after expenses, were primarily used to repay the then outstanding balance on our Credit Facilities.

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 or assuming certain liens and sale and lease-back transactions. At March 31, 2012, we were in compliance with all our debt covenants. We continually monitor compliance with the covenants under our Credit Facilities and senior notes and, based on our expectations for 2012, expect to remain in compliance during the year.

Fair Value of Debt

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). The following table presents the estimated fair value of our long-term debt as of March 31, 2012 and December 31, 2011.

	March 31, 2012				December 31, 2011
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Wholly-owned debt instruments
5.875% Senior Notes due 2013	$	299,957	$	316,003	$	299,949	$	317,586
7.375% Senior Notes due 2014		249,684		277,685		249,647		278,966
3.45% Senior Notes due 2015		350,000		367,520		350,000		363,571
3.05% Senior Notes due 2016		299,941		308,804		299,938		306,057
2.50% Senior Notes due 2017		299,827		301,653		—		—
7.50% Senior Notes due 2019		201,695		246,435		201,695		248,623
4.90% Senior Notes due 2020		498,811		536,850		498,783		531,437
4.625% Senior Notes due 2021		399,492		424,808		399,480		416,847
3.95% Senior Notes due 2022		399,035		400,535		—		—
6.20% Senior Notes due 2040		399,891		440,619		399,890		450,017
6.05% Senior Notes due 2041		397,590		433,771		397,582		443,308
5.25% Senior Notes due 2042		498,238		494,298		—		—
Credit facilities		150,000		150,000		975,000		975,000
Total long-term debt	$	4,444,161	$	4,698,981	$	4,071,964	$	4,331,412

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Guarantees of Registered Securities (Details 2) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 29, 2012	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net cash from operating activities		$ 103,708	$ 86,774
Cash flows from investing activities
Change in accrued capital expenditures		(127,393)	(471)
Refund from contract extinguishments			18,642
Net cash from investing activities		(495,358)	(596,153)
Cash flows from financing activities
Borrowings on bank credit facilities		365,000	200,000
Repayments on bank credit facilities		(1,190,000)	(240,000)
Proceeds from issuance of senior notes, net	1,190,000	1,186,636	1,087,833
Contributions from joint venture partners		40,000	396,000
Payments of joint venture debt			(693,494)
Settlement of interest rate swaps			(29,032)
Financing costs on credit facilities			(2,835)
Net cash from financing activities		361,294	680,189
Net change in cash and cash equivalents		(30,356)	170,810
Cash and cash equivalents, beginning of period		239,196	337,871
Cash and cash equivalents, end of period		208,840	508,681
Noble-Cayman [Member]
Cash flows from operating activities
Net cash from operating activities		(11,189)	(12,580)
Cash flows from financing activities
Borrowings on bank credit facilities		365,000	200,000
Repayments on bank credit facilities		(1,190,000)	(240,000)
Distributions to parent company, net		(52,727)	(52,889)
Advances (to) from affiliates		(274,544)	92,838
Notes payable to affiliates		1,188,287	15,500
Net cash from financing activities		36,016	12,614
Net change in cash and cash equivalents		24,827	34
Cash and cash equivalents, beginning of period		146	42
Cash and cash equivalents, end of period		201,215	76
Noble-Cayman [Member]
Cash flows from operating activities
Net cash from operating activities		111,968	93,499
Cash flows from investing activities
Capital expenditures		(367,325)	(609,601)
Change in accrued capital expenditures		(127,393)	(471)
Refund from contract extinguishments			18,642
Net cash from investing activities		(494,718)	(591,430)
Cash flows from financing activities
Borrowings on bank credit facilities		365,000	200,000
Repayments on bank credit facilities		(1,190,000)	(240,000)
Proceeds from issuance of senior notes, net		1,186,636	1,087,833
Contributions from joint venture partners		40,000	396,000
Payments of joint venture debt			(693,494)
Settlement of interest rate swaps			(29,032)
Financing costs on credit facilities			(2,835)
Distributions to parent company, net		(52,727)	(52,889)
Net cash from financing activities		348,909	665,583
Net change in cash and cash equivalents		(33,841)	167,652
Cash and cash equivalents, beginning of period		235,056	333,399
Cash and cash equivalents, end of period		201,215	501,051
NHC and NDH Combined [Member]
Cash flows from operating activities
Net cash from operating activities		9,223	6,411
Cash flows from investing activities
Capital expenditures		(136,890)	(318,916)
Net cash from investing activities		(136,890)	(318,916)
Cash flows from financing activities
Advances (to) from affiliates		127,546	330,187
Notes payable to affiliates			(17,500)
Net cash from financing activities		127,546	312,687
Net change in cash and cash equivalents		(121)	182
Cash and cash equivalents, beginning of period		385	146
Cash and cash equivalents, end of period		385	328
NDC [Member]
Cash flows from operating activities
Net cash from operating activities		4,529	2,762
Cash flows from financing activities
Advances (to) from affiliates		(4,529)	(2,762)
Net cash from financing activities		(4,529)	(2,762)
NHIL [Member]
Cash flows from operating activities
Net cash from operating activities		(53,966)	(48,978)
Cash flows from investing activities
Notes receivable from affiliates		(1,188,287)
Net cash from investing activities		(1,188,287)
Cash flows from financing activities
Proceeds from issuance of senior notes, net		1,186,636	1,087,833
Advances (to) from affiliates		55,621	(1,038,855)
Net cash from financing activities		1,242,257	48,978
Cash and cash equivalents, end of period		4
NDS6 [Member]
Cash flows from operating activities
Net cash from operating activities		(8,425)	(9,633)
Cash flows from financing activities
Advances (to) from affiliates		8,425	9,633
Net cash from financing activities		8,425	9,633
Other Non-guarantor Subsidiaries of Noble [Member]
Cash flows from operating activities
Net cash from operating activities		171,796	155,517
Cash flows from investing activities
Capital expenditures		(230,435)	(290,685)
Change in accrued capital expenditures			(471)
Notes receivable from affiliates			2,000
Refund from contract extinguishments			18,642
Net cash from investing activities		(357,828)	(270,514)
Cash flows from financing activities
Contributions from joint venture partners		40,000	396,000
Payments of joint venture debt			(693,494)
Settlement of interest rate swaps			(29,032)
Advances (to) from affiliates		87,481	608,959
Net cash from financing activities		127,481	282,433
Net change in cash and cash equivalents		(58,551)	167,436
Cash and cash equivalents, beginning of period		234,525	333,211
Cash and cash equivalents, end of period		234,525	500,647
Consolidating Adjustments [Member]
Cash flows from investing activities
Notes receivable from affiliates		(1,188,287)	(2,000)
Net cash from investing activities		1,188,287	(2,000)
Cash flows from financing activities
Notes payable to affiliates		(1,188,287)	2,000
Net cash from financing activities		$ (1,188,287)	$ 2,000

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Gain on contract extinguishments, net

3 Months Ended

Mar. 31, 2012

Gain on contract extinguishments, net [Abstract]

Gain on contract extinguishments, net

Note 5 — Gain on contract extinguishments, net

In January 2011, we announced the signing of a Memorandum of Understanding (“MOU”) with Petroleo Brasileiro S.A. (“Petrobras”) regarding operations in Brazil. Under the terms of the MOU, we agreed to substitute the Noble Phoenix, then under contract with Shell in Southeast Asia, for the Noble Muravlenko. In connection with the cancellation of the contract on the Noble Phoenix, we recognized a non-cash gain of approximately $52.5 million during the first quarter of 2011, which represented the unamortized fair value of the in-place contract at acquisition. As a result of the substitution, we reached a decision not to proceed with the previously announced reliability upgrade to the Noble Muravlenko that was scheduled to take place in 2013. As a result, we incurred a non-cash charge of approximately $32.6 million related to the termination of outstanding shipyard contracts. We expect the actual substitution to take place in the third quarter of 2012 after the Noble Phoenix completes its shipyard work.

In February 2011, the outstanding balances of the Bully joint venture credit facilities, which totaled $693 million, were repaid in full and the credit facilities terminated using a portion of the proceeds from our February 2011 debt offering and equity contributions from our joint venture partner. In addition, the related interest rate swaps were settled and terminated concurrent with the repayment and termination of the credit facilities. As a result of these transactions, we recognized a gain of approximately $1.3 million during the first quarter of 2011.

XML

Receivables from Customers

3 Months Ended

Mar. 31, 2012

Receivables from Customers [Abstract]

Receivables from Customers

Note 6 — Receivables from Customers

As discussed in Note 12, in May 2010, Anadarko Petroleum Corporation (“Anadarko”) sent a letter asserting that the initial attempted deepwater drilling moratorium in the U.S. Gulf of Mexico was an event of force majeure under the drilling contract for the Noble Amos Runner. In June 2010, Anadarko filed a declaratory judgment action in Federal District Court in Houston, Texas seeking to have the court declare that a force majeure condition had occurred and that the drilling contract was terminated by virtue of the initial proclaimed moratorium. We disagree that a force majeure event occurred and that Anadarko had the right to terminate the contract. In August 2010, we filed a counterclaim seeking damages from Anadarko for breach of contract. This matter is currently set for trial during the second quarter of 2012. Anadarko has also attempted to offset revenue that we had billed for services performed prior to their termination of the contract against other amounts it claims are owed relating to costs Anadarko incurred after Hurricane Ike, and that are the subject of a separate dispute (the “Hurricane Ike Case”). At March 31, 201, we had accounts receivable of approximately $13 million related to this attempted offset. We do not believe Anadarko has a basis to offset these invoiced amounts. While we will continue to litigate the matter to full resolution, we can make no assurances as to the collection of these amounts or the outcome of this dispute.

In June 2010, a subsidiary of Frontier, which we acquired in July 2010, entered into a charter contract with a subsidiary of BP PLC (“BP”) for the Seillean with a term of a minimum of 100 days. The unit went on hire on July 23, 2010. In October 2010, BP initiated an arbitration proceeding against us claiming the contract was void ab initio, or never existed, due to a fundamental breach and has made other claims and is demanding that we reimburse the amounts already paid to us under the charter. We believe BP owes us the amounts due under the charter. The charter contains a “hell or high water” provision requiring payment, and we believe we have satisfied our obligations under the charter. Outstanding receivables related to this charter totaled $35 million as of March 31, 2012. These receivables have been classified as long-term and are included in “Other assets” on our Consolidated Balance Sheet at March 31, 2012. We believe that if BP were to be successful in claiming the contract void ab initio, we would have an indemnity claim against the former shareholders of Frontier. We have put the former owners of Frontier on notice of this potential claim. We can make no assurances as to the outcome of this dispute.

At March 31, 2012, we had receivables of approximately $14 million related to the Noble Max Smith, which are being disputed by our customer, Pemex Exploracion y Produccion (“Pemex”). These receivables have been classified as long-term and are included in “Other assets” on our Consolidated Balance Sheet at March 31, 2012. The disputed amount relates to lost revenues due from Pemex for downtime that occurred after our rig was damaged when one of Pemex’s supply boats collided with our rig. In January 2012, we filed a lawsuit against Pemex in Mexican court seeking recovery of these amounts. While we believe we are entitled to the disputed amounts, we can make no assurances as to the outcome of this dispute.

XML

Income Taxes

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Taxes

Note 8 — Income Taxes

At December 31, 2011, the reserves for uncertain tax positions totaled $118 million (net of related tax benefits of $8 million). At March 31, 2012, the reserves for uncertain tax positions totaled $125 million (net of related tax benefits of $9 million). If the March 31, 2012 reserves are not realized, the provision for income taxes would be reduced by $125 million.

It is possible that our existing liabilities related to our reserve for uncertain tax positions may increase or decrease in the next twelve 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.

XML

Guarantees of Registered Securities (Tables)

3 Months Ended

Mar. 31, 2012

Guarantees of Registered Securities [Abstract]

Condensed Financial Statements

NOBLE CORPORATION (NOBLE-CAYMAN) AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

March 31, 2012

(in thousands)

													Other
													Non-guarantor
	Noble-		NHC and NDH										Subsidiaries			Consolidating
	Cayman		Combined			NDC			NHIL		NDS6		of Noble			Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	24,973	$	264		$	—		$	4	$	—	$	175,974		$	—		$	201,215
Accounts receivable		—		15,427			1,766			—		—		721,642			—			738,835
Taxes receivable		—		4,566			—			—		—		90,556			—			95,122
Prepaid expenses		—		412			20			—		—		85,809			—			86,241
Short-term notes receivable from affiliates		27,695		119,476			—			—		—		122,298			(269,469	)		—
Accounts receivable from affiliates		798,994		107,014			928,971			126,978		37,014		5,337,669			(7,336,640	)		—
Other current assets		—		640			196			—		—		121,461			—			122,297
Total current assets		851,662		247,799			930,953			126,982		37,014		6,655,409			(7,606,109	)		1,243,710
Property and equipment, at cost		—		2,277,714			71,180			—		—		12,988,104			—			15,336,998
Accumulated depreciation		—		(260,120	)		(53,732	)		—		—		(2,962,910	)		—			(3,276,762	)
Property and equipment, net		—		2,017,594			17,448			—		—		10,025,194			—			12,060,236
Notes receivable from affiliates		3,816,462		1,206,000			—			3,524,814		479,107		2,618,720			(11,645,103	)		—
Investments in affiliates		7,124,613		9,273,599			3,452,360			6,785,699		2,129,404		—			(28,765,675	)		—
Other assets		2,803		7,172			2,356			28,266		850		509,851			—			551,298
Total assets	$	11,795,540	$	12,752,164		$	4,403,117		$	10,465,761	$	2,646,375	$	19,809,174		$	(48,016,887	)	$	13,855,244
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables from affiliates	$	72,298	$	50,000		$	—		$	—	$	—	$	147,171		$	(269,469	)	$	—
Accounts payable		—		3,233			552			—		—		330,504			—			334,289
Accrued payroll and related costs		—		3,803			7,731			—		—		90,557			—			102,091
Accounts payable to affiliates		918,227		4,289,177			28,688			125,867		45,641		1,929,040			(7,336,640	)		—
Interest payable		5,965		—			—			21,945		630		—			—			28,540
Taxes payable		—		10,624			—			—		—		82,576			—			93,200
Other current liabilities		—		—			240			—		—		108,650			—			108,890
Total current liabilities		996,490		4,356,837			37,211			147,812		46,271		2,688,498			(7,606,109	)		667,010
Long-term debt		449,957		—			—			3,792,509		201,695		—			—			4,444,161
Notes payable to affiliates		2,856,106		994,500			85,000			975,000		1,342,000		5,392,497			(11,645,103	)		—
Deferred income taxes		—		—			15,731			—		—		224,610			—			240,341
Other liabilities		19,929		26,919			—			—		—		259,327			—			306,175
Total liabilities		4,322,482		5,378,256			137,942			4,915,321		1,589,966		8,564,932			(19,251,212	)		5,657,687
Commitments and contingencies
Total shareholder equity		7,473,058		7,373,908			4,265,175			5,550,440		1,056,409		10,519,743			(28,765,675	)		7,473,058
Noncontrolling interest		—		—			—			—		—		724,499			—			724,499
Total equity		7,473,058		7,373,908			4,265,175			5,550,440		1,056,409		11,244,242			(28,765,675	)		8,197,557
Total liabilities and equity	$	11,795,540	$	12,752,164		$	4,403,117		$	10,465,761	$	2,646,375	$	19,809,174		$	(48,016,887	)	$	13,855,244

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2011

(in thousands)

													Other
													Non-guarantor
	Noble-		NHC and NDH										Subsidiaries			Consolidating
	Cayman		Combined			NDC			NHIL		NDS6		of Noble			Adjustments			Total
ASSETS
Current assets
Cash and cash equivalents	$	146	$	385		$	—		$	—	$	—	$	234,525		$	—		$	235,056
Accounts receivable		—		10,810			3,371			—		—		572,982			—			587,163
Taxes receivable		—		4,566			—			—		—		70,718			—			75,284
Prepaid expenses		—		453			19			—		—		32,633			—			33,105
Short-term notes receivable from affiliates		—		119,476			—			—		—		122,298			(241,774	)		—
Accounts receivable from affiliates		1,683,740		99,202			879,581			159,132		33,905		6,372,657			(9,228,217	)		—
Other current assets		—		643			196			93		—		119,177			—			120,109
Total current assets		1,683,886		235,535			883,167			159,225		33,905		7,524,990			(9,469,991	)		1,050,717
Property and equipment, at cost		—		2,718,186			71,381			—		—		12,213,361			—			15,002,928
Accumulated depreciation		—		(220,662	)		(53,037	)		—		—		(2,860,702	)		—			(3,134,401	)
Property and equipment, net		—		2,497,524			18,344			—		—		9,352,659			—			11,868,527
Notes receivable from affiliates		3,842,062		675,000			—			2,336,527		572,107		2,678,192			(10,103,888	)		—
Investments in affiliates		6,969,201		9,101,938			3,450,212			6,605,771		2,141,450		—			(28,268,572	)		—
Other assets		3,230		8,092			2,541			18,548		880		504,870			—			538,161
Total assets	$	12,498,379	$	12,518,089		$	4,354,264		$	9,120,071	$	2,748,342	$	20,060,711		$	(47,842,451	)	$	13,457,405
LIABILITIES AND EQUITY
Current liabilities
Short-term notes payables from affiliates	$	72,298	$	50,000		$	—		$	—	$	—	$	119,476		$	(241,774	)	$	—
Accounts payable		—		5,577			985			—		—		429,167			—			435,729
Accrued payroll and related costs		—		2,897			6,518			—		—		99,493			—			108,908
Accounts payable to affiliates		2,079,719		4,166,021			27,341			112,953		34,107		2,808,076			(9,228,217	)		—
Interest payable		1,891		—			—			48,116		4,412		—			—			54,419
Taxes payable		—		10,032			—			—		—		81,158			—			91,190
Other current liabilities		—		—			240			—		—		123,159			—			123,399
Total current liabilities		2,153,908		4,234,527			35,084			161,069		38,519		3,660,529			(9,469,991	)		813,645
Long-term debt		1,274,949		—			—			2,595,320		201,695		—			—			4,071,964
Notes payable to affiliates		1,667,291		1,147,500			85,000			975,000		811,000		5,418,097			(10,103,888	)		—
Deferred income taxes		—		—			15,731			—		—		227,060			—			242,791
Other liabilities		19,929		24,878			—			—		—		210,565			—			255,372
Total liabilities		5,116,077		5,406,905			135,815			3,731,389		1,051,214		9,516,251			(19,573,879	)		5,383,772
Commitments and contingencies
Total shareholder equity		7,382,302		7,111,184			4,218,449			5,388,682		1,697,128		9,853,129			(28,268,572	)		7,382,302
Noncontrolling interest		—		—			—			—		—		691,331			—			691,331
Total equity		7,382,302		7,111,184			4,218,449			5,388,682		1,697,128		10,544,460			(28,268,572	)		8,073,633
Total liabilities and equity	$	12,498,379	$	12,518,089		$	4,354,264		$	9,120,071	$	2,748,342	$	20,060,711		$	(47,842,451	)	$	13,457,405

CONDENSED CONSOLIDATING STATEMENT OF INCOME

Three Months Ended March 31, 2012

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	42,991		$	5,061		$	—		$	—		$	718,076		$	(19,818	)	$	746,310
Reimbursables		—			5,308			—			—			—			29,833			—			35,141
Labor contract drilling services		—			—			—			—			—			16,008			—			16,008
Other		—			—			—			—			—			231			—			231
Total operating revenues		—			48,299			5,061			—			—			764,148			(19,818	)		797,690
Operating costs and expenses
Contract drilling services		1,183			14,319			1,771			17,633			—			400,058			(19,818	)		415,146
Reimbursables		—			5,087			—			—			—			25,514			—			30,601
Labor contract drilling services		—			—			—			—			—			9,232			—			9,232
Depreciation and amortization		—			14,839			1,036			—			—			154,698			—			170,573
Selling, general and administrative		357			1,346			—			8,819			—			3,488			—			14,010
Total operating costs and expenses		1,540			35,591			2,807			26,452			—			592,990			(19,818	)		639,562
Operating income (loss)		(1,540	)		12,708			2,254			(26,452	)		—			171,158			—			158,128
Other income (expense)
Equity earnings in affiliates, net of tax		155,412			134,585			45,802			179,928			75,861			—			(591,588	)		—
Interest expense, net of amounts capitalized		(20,606	)		(14,914	)		(1,346	)		(20,972	)		(7,783	)		(19,896	)		75,021			(10,496	)
Interest income and other, net		1,386			7,824			16			29,254			3,110			34,830			(75,021	)		1,399
Income before income taxes		134,652			140,203			46,726			161,758			71,188			186,092			(591,588	)		149,031
Income tax provision		—			(8,776	)		—			—			—			(12,435	)		—			(21,211	)
Net Income		134,652			131,427			46,726			161,758			71,188			173,657			(591,588	)		127,820
Net loss attributable to noncontrolling interests		—			—			—			—			—			6,832			—			6,832
Net income attributable to Noble Corporation		134,652			131,427			46,726			161,758			71,188			180,489			(591,588	)		134,652
Other comprehensive income, net		3,761			—			—			—			—			3,761			(3,761	)		3,761
Comprehensive income attributable to Noble Corporation	$	138,413		$	131,427		$	46,726		$	161,758		$	71,188		$	184,250		$	(595,349	)	$	138,413

CONDENSED CONSOLIDATING STATEMENT OF INCOME

Three Months Ended March 31, 2011

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Operating revenues
Contract drilling services	$	—		$	25,964		$	4,990		$	—		$	—		$	523,594		$	(11,943	)	$	542,605
Reimbursables		—			912			12			—			—			21,367			—			22,291
Labor contract drilling services		—			—			—			—			—			13,547			—			13,547
Other		—			—			—			—			—			445			—			445
Total operating revenues		—			26,876			5,002			—			—			558,953			(11,943	)		578,888
Operating costs and expenses
Contract drilling services		1,461			8,984			1,823			8,570			—			291,937			(11,943	)		300,832
Reimbursables		—			904			—			—			—			16,199			—			17,103
Labor contract drilling services		—			—			—			—			—			8,523			—			8,523
Depreciation and amortization		—			10,124			909			—			—			146,622			—			157,655
Selling, general and administrative		1,511			1,509			—			7,877			—			5,634			—			16,531
Gain on contract extinguishments, net		—			—			—			—			—			(21,202	)		—			(21,202	)
Total operating costs and expenses		2,972			21,521			2,732			16,447			—			447,713			(11,943	)		479,442
Operating income (loss)		(2,972	)		5,355			2,270			(16,447	)		—			111,240			—			99,446
Other income (expense)
Equity earnings in affiliates, net of tax		87,280			37,939			15,801			50,061			35,820			—			(226,901	)		—
Interest expense, net of amounts capitalized		(18,361	)		(14,592	)		(1,820	)		(22,496	)		(7,671	)		(2,131	)		48,030			(19,041	)
Interest income and other, net		1,713			5,538			11			11,309			1,792			29,908			(48,030	)		2,241
Income before income taxes		67,660			34,240			16,262			22,427			29,941			139,017			(226,901	)		82,646
Income tax provision		—			(858	)		—			—			—			(14,167	)		—			(15,025	)
Net Income		67,660			33,382			16,262			22,427			29,941			124,850			(226,901	)		67,621
Net loss attributable to noncontrolling interests		—			—			—			—			—			39			—			39
Net income attributable to Noble Corporation		67,660			33,382			16,262			22,427			29,941			124,889			(226,901	)		67,660
Other comprehensive income, net		3,489			—			—			—			—			3,489			(3,489	)		3,489
Net comprehensive loss attributable to noncontrolling interest		—			—			—			—			—			1			—			1
Comprehensive income attributable to Noble Corporation	$	71,149		$	33,382		$	16,262		$	22,427		$	29,941		$	128,379		$	(230,390	)	$	71,150

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Three Months Ended March 31, 2012

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Cash flows from operating activities
Net cash from operating activities	$	(11,189	)	$	9,223		$	4,529		$	(53,966	)	$	(8,425	)	$	171,796		$	—		$	111,968
Cash flows from investing activities
Capital expenditures		—			(136,890	)		—			—			—			(230,435	)		—			(367,325	)
Change in accrued capital expenditures		—			—			—			—			—			(127,393	)		—			(127,393	)
Notes receivable from affiliates		—			—			—			(1,188,287	)		—			—			1,188,287			—
Net cash from investing activities		—			(136,890	)		—			(1,188,287	)		—			(357,828	)		1,188,287			(494,718	)
Cash flows from financing activities
Borrowings on bank credit facilities		365,000			—			—			—			—			—			—			365,000
Repayments on bank credit facilities		(1,190,000	)		—			—			—			—			—			—			(1,190,000	)
Proceeds from issuance of senior notes, net		—			—			—			1,186,636			—			—			—			1,186,636
Contributions from joint venture partners		—			—			—			—			—			40,000			—			40,000
Distributions to parent		(52,727	)		—			—			—			—			—			—			(52,727	)
Advances (to) from affiliates		(274,544	)		127,546			(4,529	)		55,621			8,425			87,481			—			—
Notes payable to affiliates		1,188,287			—			—			—			—			—			(1,188,287	)		—
Net cash from financing activities		36,016			127,546			(4,529	)		1,242,257			8,425			127,481			(1,188,287	)		348,909
Net change in cash and cash equivalents		24,827			(121	)		—			4			—			(58,551	)		—			(33,841	)
Cash and cash equivalents, beginning of period		146			385			—			—			—			234,525			—			235,056
Cash and cash equivalents, end of period	$	24,973		$	264		$	—		$	4		$	—		$	175,974		$	—		$	201,215

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

Three Months Ended March 31, 2011

(in thousands)

																Other
																Non-guarantor
	Noble-			NHC and NDH												Subsidiaries			Consolidating
	Cayman			Combined			NDC			NHIL			NDS6			of Noble			Adjustments			Total
Cash flows from operating activities
Net cash from operating activities	$	(12,580	)	$	6,411		$	2,762		$	(48,978	)	$	(9,633	)	$	155,517		$	—		$	93,499
Cash flows from investing activities
Capital expenditures		—			(318,916	)		—			—			—			(290,685	)		—			(609,601	)
Change in accrued capital expenditures		—			—			—			—			—			(471	)		—			(471	)
Notes receivable from affiliates		—			—			—			—			—			2,000			(2,000	)		—
Refund from contract extinguishments		—			—			—			—			—			18,642			—			18,642
Net cash from investing activities		—			(318,916	)		—			—			—			(270,514	)		(2,000	)		(591,430	)
Cash flows from financing activities
Borrowings on bank credit facilities		200,000			—			—			—			—			—			—			200,000
Repayments on bank credit facilities		(240,000	)		—			—			—			—			—			—			(240,000	)
Proceeds from issuance of senior notes, net		—			—			—			1,087,833			—			—			—			1,087,833
Contributions from joint venture partners		—			—			—			—			—			396,000			—			396,000
Payments of joint venture debt		—			—			—			—			—			(693,494	)		—			(693,494	)
Settlement of interest rate swaps		—			—			—			—			—			(29,032	)		—			(29,032	)
Financing costs on credit facilities		(2,835	)		—			—			—			—			—			—			(2,835	)
Distributions to parent		(52,889	)		—			—			—			—			—			—			(52,889	)
Advances (to) from affiliates		92,838			330,187			(2,762	)		(1,038,855	)		9,633			608,959			—			—
Notes payable to affiliates		15,500			(17,500	)		—			—			—			—			2,000			—
Net cash from financing activities		12,614			312,687			(2,762	)		48,978			9,633			282,433			2,000			665,583
Net change in cash and cash equivalents		34			182			—			—			—			167,436			—			167,652
Cash and cash equivalents, beginning of period		42			146			—			—			—			333,211			—			333,399
Cash and cash equivalents, end of period	$	76		$	328		$	—		$	—		$	—		$	500,647		$	—		$	501,051

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Derivative Instruments and Hedging Activities (Details 1) (Short-term foreign currency forward contracts [Member], Other current liabilities [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Short-term foreign currency forward contracts [Member] | Other current liabilities [Member]
Liability derivatives
Cash flow hedges, Estimated fair value	$ 644	$ 3,061

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Segment and Related Information

3 Months Ended

Mar. 31, 2012

Segment and Related Information [Abstract]

Segment and Related Information

Note 13 — Segment and Related Information

We report our contract drilling operations as a single reportable segment: Contract Drilling Services. The consolidation of our contract drilling operations into one reportable segment is attributable to how we manage our business, and the fact that all of our drilling fleet is dependent upon the worldwide oil and gas industry. The mobile offshore drilling units comprising our offshore rig fleet operate in a single, global market for contract drilling services and are often redeployed globally in response to changing demands of our customers, which consist largely of major non-U.S. and government owned/controlled oil and gas companies throughout the world. Our Contract Drilling Services segment currently conducts contract drilling operations principally in the U.S. Gulf of Mexico, Mexico, Brazil, the North Sea, the Mediterranean, West Africa, the Middle East, India and the Asian Pacific.

We evaluate the performance of our operating segment primarily based on operating revenues and net income. Summarized financial information of our reportable segments for the three months ended March 31, 2012 and 2011 for Noble-Swiss and Noble-Cayman are shown in the following table. The “Other” column includes results of labor contract drilling services in Canada and Alaska, as well as corporate related items.

	Noble-Swiss
	Three Months Ended March 31,
	2012									2011
	Contract									Contract
	Drilling									Drilling
	Services			Other			Total			Services			Other			Total
Revenues from external customers	$	781,243		$	16,447		$	797,690		$	564,654		$	14,234		$	578,888
Depreciation and amortization		167,948			3,129			171,077			154,888			3,234			158,122
Segment operating income		140,267			3,376			143,643			84,716			1,548			86,264
Interest expense, net of amount capitalized		(89	)		(10,407	)		(10,496	)		(1,085	)		(17,956	)		(19,041	)
Income tax (provision)/ benefit		(22,600	)		1,011			(21,589	)		(18,863	)		3,504			(15,359	)
Segment profit/ (loss)		125,484			(5,309	)		120,175			66,880			(12,385	)		54,495
Total assets (at end of period)		13,248,321			646,880			13,895,201			11,716,530			213,355			11,929,885

	Noble-Cayman
	Three Months Ended March 31,
	2012									2011
	Contract									Contract
	Drilling									Drilling
	Services			Other			Total			Services			Other			Total
Revenues from external customers	$	781,243		$	16,447		$	797,690		$	564,654		$	14,234		$	578,888
Depreciation and amortization		167,948			2,625			170,573			154,888			2,767			157,655
Segment operating income		140,267			17,861			158,128			84,716			14,730			99,446
Interest expense, net of amount capitalized		(89	)		(10,407	)		(10,496	)		(1,085	)		(17,956	)		(19,041	)
Income tax (provision)/ benefit		(22,600	)		1,389			(21,211	)		(18,863	)		3,838			(15,025	)
Segment profit		125,484			9,168			134,652			66,880			780			67,660
Total assets (at end of period)		13,248,321			606,923			13,855,244			11,716,530			174,891			11,891,421

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Share Data (Tables)

3 Months Ended

Mar. 31, 2012

Share Data [Abstract]

Noble-Swiss' share capital

The following is a detail of Noble-Swiss’ share capital as of March 31, 2012 and December 31, 2011:

	March 31, 2012		December 31, 2011
Shares outstanding and trading		252,267		252,352
Treasury shares		463		287
Total shares outstanding		252,730		252,639
Treasury shares held for share-based compensation plans		13,420		13,511
Total shares authorized for issuance		266,150		266,150
Par value per share (in Swiss Francs)		3.28		3.41

Computation of basic and diluted earnings per share for Noble-Swiss

The following table sets forth the computation of basic and diluted earnings per share for Noble-Swiss:

	Three months ended March 31,
	2012			2011
Allocation of net income
Basic
Net income attributable to Noble Corporation	$	120,175		$	54,495
Earnings allocated to unvested share-based payment awards		(1,126	)		(509	)
Net income to common shareholders—basic	$	119,049		$	53,986
Diluted
Net income attributable to Noble Corporation	$	120,175		$	54,495
Earnings allocated to unvested share-based payment awards		(1,125	)		(509	)
Net income to common shareholders—diluted	$	119,050		$	53,986
Weighted average shares outstanding—basic		251,971			251,026
Incremental shares issuable from assumed exercise of stock options		491			775
Weighted average shares outstanding—diluted		252,462			251,801
Weighted average unvested share-based payment awards		2,407			2,419
Earnings per share
Basic	$	0.47		$	0.22
Diluted	$	0.47		$	0.21

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Employee Benefit Plans (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Employee Benefit Plans (Textual) [Abstract]
Employer contributions	$ 4	$ 2
Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to pension plans during 2012	19
U.S., Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to pension plans during 2012	$ 19

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Property and Equipment (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Rigs	Mar. 31, 2011
Property, Plant and Equipment [Line Items]
Amount included in capital expenditure for major project upgrades	$ 147
Property and Equipment (Textual) [Abstract]
Capital expenditure	368	614
New construction	133
Amount included in other capital expenditure for upgrading drillships	25
Number of drillships operating under contracts in Brazil	2
Other capital expenditure	47
Major capitalized expenditure useful life minimum	3 years
Major capitalized expenditure useful life maximum	5 years
Capitalized Interest	41
Capitalized interest on construction in progress	41	27
Subsea [Member]
Property, Plant and Equipment [Line Items]
Amount included in capital expenditure for major project upgrades	$ 25

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Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 113,343	$ 54,456
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(41)	3,040
Gain on foreign currency forward contracts	2,417	162
Loss on interest rate swaps		(366)
Amortization of deferred pension plan amounts (net of tax provision of $720 in 2012 and $353 in 2011)	1,385	653
Other comprehensive income, net	3,761	3,488
Net loss attributable to noncontrolling interests	6,832	39
Comprehensive income attributable to Noble Corporation	123,936	57,985
Noble-Cayman [Member]
Net income	127,820	67,621
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(41)	3,040
Gain on foreign currency forward contracts	2,417	162
Loss on interest rate swaps		(366)
Amortization of deferred pension plan amounts (net of tax provision of $720 in 2012 and $353 in 2011)	1,385	653
Other comprehensive income, net	3,761	3,488
Net loss attributable to noncontrolling interests	6,832	39
Comprehensive income attributable to Noble Corporation	$ 138,413	$ 71,150

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Consolidated Joint Ventures

3 Months Ended

Mar. 31, 2012

Consolidated Joint Ventures [Abstract]

Consolidated Joint Ventures

Note 2 — Consolidated Joint Ventures

We own a 50 percent interest in two joint ventures, each with a subsidiary of Royal Dutch Shell, PLC (“Shell”), for the construction and operation of our two Bully-class drillships. Since these entities’ equity at risk is insufficient to permit them to carry on their activities without additional financial support, they each meet the criteria for a variable interest entity. We have determined that we are the primary beneficiary for accounting purposes. 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.

In April 2011, the Bully joint venture partners entered into capital contribution agreements whereby capital calls up to a total of $360 million can be made for funds needed to complete the construction of the drillships. All contributions under these agreements were made during 2011 and the first quarter of 2012. No amounts remain available under these agreements.

At March 31, 2012, the combined carrying amount of the drillships was $1.4 billion, which was primarily funded through partner equity contributions.

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Guarantees of Registered Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 208,840	$ 239,196	$ 508,681	$ 337,871
Accounts receivable	738,835	587,163
Taxes receivable	95,308	75,284
Prepaid expenses	88,499	35,796
Total current assets	1,254,673	1,059,612
Property and equipment, at cost	15,371,823	15,037,112
Accumulated depreciation	(3,282,511)	(3,139,645)
Property and equipment, net	12,089,312	11,897,467
Other assets	551,216	538,080
Total assets	13,895,201	13,495,159	11,929,885
Current liabilities
Accounts payable	335,276	436,006
Accrued payroll and related costs	111,251	117,907
Interest payable	28,540	54,419
Taxes payable	97,179	94,920
Other current liabilities	108,911	123,928
Total current liabilities	681,157	827,180
Long-term debt	4,444,161	4,071,964
Deferred income taxes	240,341	242,791
Total liabilities	5,671,834	5,397,307
Commitments and contingencies
Total shareholders' equity	7,498,868	7,406,521
Noncontrolling interests	724,499	691,331
Total equity	8,223,367	8,097,852	7,676,566	7,287,634
Total liabilities and equity	13,895,201	13,495,159
Noble-Cayman [Member]
Current assets
Cash and cash equivalents	201,215	146	76	42
Short-term notes receivable from affiliates	27,695
Accounts receivable from affiliates	798,994	1,683,740
Total current assets	851,662	1,683,886
Notes receivable from affiliates	3,816,462	3,842,062
Investments in affiliates	7,124,613	6,969,201
Other assets	2,803	3,230
Total assets	11,795,540	12,498,379
Current liabilities
Short-term notes payables from affiliates	72,298	72,298
Accounts payable to affiliates	918,227	2,079,719
Interest payable	5,965	1,891
Total current liabilities	996,490	2,153,908
Long-term debt	449,957	1,274,949
Notes payable to affiliates	2,856,106	1,667,291
Other liabilities	19,929	19,929
Total liabilities	4,322,482	5,116,077
Commitments and contingencies
Total shareholders' equity	7,473,058	7,382,302
Total equity	7,473,058	7,382,302
Total liabilities and equity	11,795,540	12,498,379
Noble-Cayman [Member]
Current assets
Cash and cash equivalents	201,215	235,056	501,051	333,399
Accounts receivable	738,835	587,163
Taxes receivable	95,122	75,284
Prepaid expenses	86,241	33,105
Other current assets	122,297	120,109
Total current assets	1,243,710	1,050,717
Property and equipment, at cost	15,336,998	15,002,928
Accumulated depreciation	(3,276,762)	(3,134,401)
Property and equipment, net	12,060,236	11,868,527
Other assets	551,298	538,161
Total assets	13,855,244	13,457,405	11,891,421
Current liabilities
Accounts payable	334,289	435,729
Accrued payroll and related costs	102,091	108,908
Interest payable	28,540	54,419
Taxes payable	93,200	91,190
Other current liabilities	108,890	123,399
Total current liabilities	667,010	813,645
Long-term debt	4,444,161	4,071,964
Deferred income taxes	240,341	242,791
Other liabilities	306,175	255,372
Total liabilities	5,657,687	5,383,772
Commitments and contingencies
Total shareholders' equity	7,473,058	7,382,302
Noncontrolling interests	724,499	691,331
Total equity	8,197,557	8,073,633	7,645,026	7,260,655
Total liabilities and equity	13,855,244	13,457,405
NHC and NDH Combined [Member]
Current assets
Cash and cash equivalents	385	385	328	146
Accounts receivable	15,427	10,810
Taxes receivable	4,566	4,566
Prepaid expenses	412	453
Short-term notes receivable from affiliates	119,476	119,476
Accounts receivable from affiliates	107,014	99,202
Other current assets	640	643
Total current assets	247,799	235,535
Property and equipment, at cost	2,277,714	2,718,186
Accumulated depreciation	(260,120)	(220,662)
Property and equipment, net	2,017,594	2,497,524
Notes receivable from affiliates	1,206,000	675,000
Investments in affiliates	9,273,599	9,101,938
Other assets	7,172	8,092
Total assets	12,752,164	12,518,089
Current liabilities
Short-term notes payables from affiliates	50,000	50,000
Accounts payable	3,233	5,577
Accrued payroll and related costs	3,803	2,897
Accounts payable to affiliates	4,289,177	4,166,021
Taxes payable	10,624	10,032
Total current liabilities	4,356,837	4,234,527
Notes payable to affiliates	994,500	1,147,500
Other liabilities	26,919	24,878
Total liabilities	5,378,256	5,406,905
Commitments and contingencies
Total shareholders' equity	7,373,908	7,111,184
Total equity	7,373,908	7,111,184
Total liabilities and equity	12,752,164	12,518,089
NDC [Member]
Current assets
Accounts receivable	1,766	3,371
Prepaid expenses	20	19
Accounts receivable from affiliates	928,971	879,581
Other current assets	196	196
Total current assets	930,953	883,167
Property and equipment, at cost	71,180	71,381
Accumulated depreciation	(53,732)	(53,037)
Property and equipment, net	17,448	18,344
Investments in affiliates	3,452,360	3,450,212
Other assets	2,356	2,451
Total assets	4,403,117	4,354,264
Current liabilities
Accounts payable	552	985
Accrued payroll and related costs	7,731	6,518
Accounts payable to affiliates	28,688	27,341
Other current liabilities	240	240
Total current liabilities	37,211	35,084
Notes payable to affiliates	85,000	85,000
Deferred income taxes	15,731	15,731
Total liabilities	137,942	135,815
Commitments and contingencies
Total shareholders' equity	4,265,175	4,218,449
Total equity	4,265,175	4,218,449
Total liabilities and equity	4,403,117	4,354,264
NHIL [Member]
Current assets
Cash and cash equivalents	4
Accounts receivable from affiliates	126,978	159,132
Other current assets		93
Total current assets	126,982	159,225
Notes receivable from affiliates	3,524,814	2,336,527
Investments in affiliates	6,785,699	6,605,771
Other assets	28,266	18,548
Total assets	10,465,761	9,120,071
Current liabilities
Accounts payable to affiliates	125,867	112,953
Interest payable	21,945	48,116
Total current liabilities	147,812	161,069
Long-term debt	3,792,509	2,595,320
Notes payable to affiliates	975,000	975,000
Total liabilities	4,915,321	3,731,389
Commitments and contingencies
Total shareholders' equity	5,550,440	5,388,682
Total equity	5,550,440	5,388,682
Total liabilities and equity	10,465,761	9,120,071
NDS6 [Member]
Current assets
Accounts receivable from affiliates	37,014	33,905
Total current assets	37,014	33,905
Notes receivable from affiliates	479,107	572,107
Investments in affiliates	2,129,404	2,141,450
Other assets	850	880
Total assets	2,646,375	2,748,342
Current liabilities
Accounts payable to affiliates	45,641	34,107
Interest payable	630	4,412
Total current liabilities	46,271	38,519
Long-term debt	201,695	201,695
Notes payable to affiliates	1,342,000	811,000
Total liabilities	1,589,966	1,051,214
Commitments and contingencies
Total shareholders' equity	1,056,409	1,697,128
Total equity	1,056,409	1,697,128
Total liabilities and equity	2,646,375	2,748,342
Other Non-guarantor Subsidiaries of Noble [Member]
Current assets
Cash and cash equivalents	234,525	234,525	500,647	333,211
Accounts receivable	721,642	572,982
Taxes receivable	90,556	70,718
Prepaid expenses	85,809	32,633
Short-term notes receivable from affiliates	122,298	122,298
Accounts receivable from affiliates	5,337,669	6,372,657
Other current assets	121,461	119,177
Total current assets	6,655,409	7,524,990
Property and equipment, at cost	12,988,104	12,213,361
Accumulated depreciation	(2,962,910)	(2,860,702)
Property and equipment, net	10,025,194	9,352,659
Notes receivable from affiliates	2,618,720	2,678,192
Other assets	509,851	504,870
Total assets	19,809,174	20,060,711
Current liabilities
Short-term notes payables from affiliates	147,171	119,476
Accounts payable	330,504	429,167
Accrued payroll and related costs	90,557	99,493
Accounts payable to affiliates	1,929,040	2,808,076
Taxes payable	82,576	81,158
Other current liabilities	108,650	123,159
Total current liabilities	2,688,498	3,660,529
Notes payable to affiliates	5,392,497	5,418,097
Deferred income taxes	224,610	227,060
Other liabilities	259,327	210,565
Total liabilities	8,564,932	9,516,251
Commitments and contingencies
Total shareholders' equity	10,519,743	9,853,129
Noncontrolling interests	724,499	691,331
Total equity	11,244,242	10,544,460
Total liabilities and equity	19,809,174	20,060,711
Consolidating Adjustments [Member]
Current assets
Short-term notes receivable from affiliates	(269,469)	(241,774)
Accounts receivable from affiliates	(7,336,640)	(9,228,217)
Total current assets	(7,606,109)	(9,469,991)
Notes receivable from affiliates	(11,645,103)	(10,103,888)
Investments in affiliates	(28,765,675)	(28,268,572)
Total assets	(48,016,887)	(47,842,451)
Current liabilities
Short-term notes payables from affiliates	(269,469)	(241,774)
Accounts payable to affiliates	(7,336,640)	(9,228,217)
Total current liabilities	(7,606,109)	(9,469,991)
Notes payable to affiliates	(11,645,103)	(10,103,888)
Total liabilities	(19,251,212)	(19,573,879)
Commitments and contingencies
Total shareholders' equity	(28,765,675)	(28,268,572)
Total equity	(28,765,675)	(28,268,572)
Total liabilities and equity	$ (48,016,887)	$ (47,842,451)

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Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2012

Property and Equipment [Abstract]

Property and Equipment

Property and equipment, at cost, as of March 31, 2012 and December 31, 2011 consisted of the following:

	March 31, 2012		December 31, 2011
Drilling equipment and facilities	$	11,277,790	$	10,471,877
Construction in progress		3,893,858		4,367,750
Other		200,175		197,485
	$	15,371,823	$	15,037,112

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Share Data (Details1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Basic
Net income attributable to Noble Corporation	$ 120,175	$ 54,495
Earnings allocated to unvested share-based payment awards	(1,126)	(509)
Net income to common shareholders - basic	119,049	53,986
Diluted
Net income attributable to Noble Corporation	120,175	54,495
Earnings allocated to unvested share-based payment awards	(1,125)	(509)
Net income to common shareholders - diluted	$ 119,050	$ 53,986
Weighted average shares outstanding - basic	251,971	251,026
Incremental shares issuable from assumed exercise of stock options	491	775
Weighted average shares outstanding - diluted	252,462	251,801
Weighted average unvested share-based payment awards	2,407	2,419
Earnings per share
Basic	$ 0.47	$ 0.22
Diluted	$ 0.47	$ 0.21

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2012

Commitments and Contingencies [Abstract]

Commitments and Contingencies

Note 12 — Commitments and Contingencies

As discussed in Note 6, in May 2010 Anadarko sent a letter asserting that the initial attempted deepwater drilling moratorium in the U.S. Gulf of Mexico was an event of force majeure under the drilling contract for the Noble Amos Runner. In June 2010, Anadarko filed a declaratory judgment action in Federal District Court in Houston, Texas seeking to have the court declare that a force majeure condition had occurred and that the drilling contract was terminated by virtue of the initial proclaimed moratorium. We disagree that a force majeure event occurred and that Anadarko had the right to terminate the contract. In August 2010, we filed a counterclaim seeking damages from Anadarko for breach of contract. This matter is currently set for trial during the second quarter of 2012. As a result of the uncertainties noted above, we have not recognized any revenue under the portion of this contract relating to the period after termination and the matter could have a material positive effect on our results of operations or cash flows for the period in which the matter is resolved should the court ultimately rule in our favor.

A separate dispute with Anadarko relating to Hurricane Ike costs is the subject of a lawsuit brought by Anadarko after the initiation of the force majeure action described above. In the Hurricane Ike Case, which was filed in August 2010, Anadarko is seeking to recover various costs and damages including damages to recover two of our rigs under contract to Anadarko, costs that it may incur in the future to recover mooring components from the sea floor and costs Anadarko claims were incurred for a mooring upgrade of the two rigs. The Hurricane Ike Case had been consolidated in the Federal District Court in Houston, Texas with an action we initiated in September 2009 against a manufacturer of wire ropes, Bridon-American Corp. and Bridon International, Ltd (collectively, “Bridon”), and their distributor, Certex USA Inc., for damages we sustained after Bridon wire ropes parted on several of our drilling rigs during Hurricane Ike. The court granted our motion for summary judgment against Anadarko in this case. This ruling can be appealed by Anadarko. We do not believe Anadarko's claims in the Hurricane Ike Case are meritorious and believe the likelihood of success by Anadarko is remote for the vast majority of damages it seeks in that case. The consolidated Bridon/Certex case is currently set for trial in the second quarter of 2012. While we do not believe Anadarko's claims in this case are meritorious, we can make no assurances as to the outcome of this dispute.

The Noble Homer Ferrington is under contract with a subsidiary of ExxonMobil Corporation (“ExxonMobil”), who entered into an assignment agreement with BP for a two well farmout of the rig in Libya after successfully drilling two wells with the rig for ExxonMobil. In August 2010, BP attempted to terminate the assignment agreement claiming that the rig was not in the required condition. ExxonMobil has informed us that we must look to BP for payment of the dayrate during the assignment period. In August 2010, we initiated arbitration proceedings under the drilling contract against both BP and ExxonMobil. We do not believe BP had the right to terminate the assignment agreement and believe the rig continues to be fully ready to operate under the drilling contract. The rig has been operating under farm-out arrangements since March 2011. We believe we are owed dayrate by either or both of these clients. The operating dayrate was approximately $538,000 per day for the work in Libya. We are proceeding with the arbitration process and intend to vigorously pursue these claims. As a result of the uncertainties noted above, we have not recognized any revenue during the assignment period and the matter could have a material positive effect on our results of operations or cash flows in the period the matter is resolved should the arbitration panel ultimately rule in our favor.

In August 2007, we entered into a drilling contract with Marathon Oil Company (“Marathon”) for the Noble Jim Day to operate in the U.S. Gulf of Mexico. On January 1, 2011, Marathon provided notice that it was terminating the contract. Marathon’s stated reason for the termination was that the rig had not been accepted by Marathon by December 31, 2010, and Marathon also maintained that a force majeure condition existed under the contract. The contract contained a provision allowing Marathon to terminate if the rig had not commenced operations by December 31, 2010. We believe the rig was ready to commence operations and should have been accepted by Marathon. The contract term was for four years. No revenue has been recognized under this contract. We have contracted the rig for much of the original term with other customers. In March 2011, we filed suit in Texas State District Court against Marathon seeking damages for its actions, and the suit is proceeding. We cannot provide assurance as to the outcome of this lawsuit.

During the fourth quarter of 2007, our Nigerian subsidiary received letters from the Nigerian Maritime Administration and Safety Agency (“NIMASA”) seeking to collect a two percent surcharge on contract amounts under contracts performed by “vessels,” within the meaning of Nigeria’s cabotage laws, engaged in the Nigerian coastal shipping trade. Although we do not believe that these laws apply to our ownership of drilling units, NIMASA is seeking to apply a provision of the Nigerian cabotage laws (which became effective on May 1, 2004) to our offshore drilling units by considering these units to be “vessels” within the meaning of those laws and therefore subject to the surcharge, which is imposed only upon “vessels.” Our offshore drilling units are not engaged in the Nigerian coastal shipping trade and are not in our view “vessels” within the meaning of Nigeria’s cabotage laws. In January 2008, we filed an originating summons against NIMASA and the Minister of Transportation in the Federal High Court of Lagos, Nigeria seeking, among other things, a declaration that our drilling operations do not constitute “coastal trade” or “cabotage” within the meaning of Nigeria’s cabotage laws and that our offshore drilling units are not “vessels” within the meaning of those laws. In February 2009, NIMASA filed suit against us in the Federal High Court of Nigeria seeking collection of the cabotage surcharge. In August 2009, the court issued a favorable ruling in response to our originating summons stating that drilling operations do not fall within the cabotage laws and that drilling rigs are not vessels for purposes of those laws. The court also issued an injunction against the defendants prohibiting their interference with our drilling rigs or drilling operations. NIMASA has appealed the court’s ruling, although the court dismissed NIMASA’s lawsuit filed against us in February 2009. We intend to take all further appropriate legal action to resist the application of Nigeria’s cabotage laws to our drilling units. The outcome of any such legal action and the extent to which we may ultimately be responsible for the surcharge is uncertain. If it is ultimately determined that offshore drilling units constitute vessels within the meaning of the Nigerian cabotage laws, we may be required to pay the surcharge and comply with other aspects of the Nigerian cabotage laws, which could adversely affect our operations in Nigerian waters and require us to incur additional costs of compliance.

NIMASA had previously informed the Nigerian Content Division of its position that we were not in compliance with the cabotage laws. The Nigerian Content Division makes determinations of companies’ compliance with applicable local content regulations for purposes of government contracting, including contracting for services in connection with oil and gas concessions where the Nigerian national oil company is a partner. The Nigerian Content Division had previously barred us from participating in new tenders as a result of NIMASA’s allegations, although the Division reversed its actions based on the favorable Federal High Court ruling. However, no assurance can be given with respect to our ability to bid for future work in Nigeria until our dispute with NIMASA is resolved.

We are from time to time a party to various lawsuits that are incidental to our operations in which the claimants seek an unspecified amount of monetary damages for personal injury, including injuries purportedly resulting from exposure to asbestos on drilling rigs and associated facilities. At March 31, 2012, there were 24 asbestos related lawsuits in which we are one of many defendants. These lawsuits have been filed in the United States in the states of Louisiana, Mississippi and Texas. We intend to vigorously defend against the litigation. We do not believe the ultimate resolution of these matters will have a material adverse effect on our financial position, results of operations or cash flows.

We are a defendant in certain claims and litigation arising out of operations in the ordinary course of business, including certain disputes with customers over receivables discussed in Note 6, 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 operate in a number of countries throughout the world and our income tax returns filed in those jurisdictions are subject to review and examination by tax authorities within those jurisdictions. The U.S. Internal Revenue Service (“IRS”) has completed its audit examination of our 2008 U.S. tax return and proposed adjustments and deficiencies with respect to certain items that were reported by us for the 2008 tax year. We believe that we have accurately reported all amounts in our 2008 tax return, and have filed protests with the IRS Office of Appeals contesting the examination team’s proposed adjustments. We intend to vigorously defend our reported positions. We have recently been informed by the IRS that our 2009 tax return is under audit. We expect to receive more Information Document Requests in the coming months. In addition, a U.S. subsidiary of Frontier is also under audit by the IRS for its 2007 and 2008 tax returns. Furthermore, we are currently contesting several non-U.S. tax assessments and may contest future assessments when we disagree with those assessments based on the technical merits of the positions established at the time of the filing of the tax return. We believe the ultimate resolution of the outstanding assessments, for which we have not made any accrual, will not have a material adverse effect on our consolidated financial statements. 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 the existing or future assessments.

Certain of our non-U.S. income tax returns have been examined for the 2002 through 2008 periods and audit claims have been assessed for approximately $279 million (including interest and penalties), primarily in Mexico. In Mexico, these assessments total approximately $266 million. We recently received from the Regional Chamber of the Federal Tax Court adverse decisions with respect to approximately $6 million in assessments related to depreciation deductions, which we are appealing. We are also contesting all other assessments in Mexico. Tax authorities in Mexico and other jurisdictions may issue additional assessments or pursue legal actions as a result of tax audits and we cannot predict or provide assurance as to the ultimate outcome of such assessments and legal actions.

Additional audit claims of approximately $83 million attributable to customs and other business taxes have been assessed against us in other jurisdictions. We have contested, or intend to contest, these assessments, including through litigation if necessary, and we believe the ultimate resolution, for which we have not made any accrual, will not have a material adverse effect on our consolidated financial statements.

We maintain certain insurance coverage against specified marine perils which includes physical damage and loss of hire. Damage caused by hurricanes has negatively impacted the energy insurance market, resulting in more restrictive and expensive coverage for U.S. named windstorm perils. Accordingly, we have elected to significantly reduce the named windstorm insurance on our rigs operating in the U.S. Gulf of Mexico. Presently we insure the Noble Jim Thompson, Noble Amos Runner and Noble Driller for “total loss only” when caused by a named windstorm. The remaining rigs in the U.S. Gulf of Mexico are self-insured for named windstorm perils. Our rigs located in the Mexico portion of the Gulf of Mexico remain covered by commercial insurance for windstorm damage. In addition, we maintain physical damage deductibles on our rigs ranging from $15 million to $25 million per occurrence, depending on location. The loss of hire coverage applies only to our rigs operating under contract with a dayrate equal to or greater than $200,000 a day and is subject to a 45-day waiting period for each unit and each occurrence.

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 and contractual rights to indemnity 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, certain loss or damage to property on board 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 materially adversely affect our financial position, results of operations or cash flows. Additionally, there can be no assurance that those parties with contractual obligations to indemnify us will necessarily be financially able to indemnify us against all these risks.

In January 2012, we were assessed a fine by the Brazilian government in the amount of R$1.8 million (approximately $950,000) in connection with the inadvertent discharge of drilling fluid from one of our rigs offshore Brazil in September 2011. We have accepted the assessment.

In October 2011, we were assessed a fine by the Brazilian government in the amount of R$238,000 (approximately $135,000) in connection with the inadvertent discharge of drilling fluid from one of our rigs offshore Brazil in November 2010. We have accepted the assessment.

We carry protection and indemnity insurance covering marine third party liability exposures, which also includes coverage for employer’s liability resulting from personal injury to our offshore drilling crews. Our protection and indemnity policy currently has a standard deductible of $10 million per occurrence, with maximum liability coverage of $750 million.

In connection with our capital expenditure program, we had outstanding commitments, including shipyard and purchase commitments of approximately $3.0 billion at March 31, 2012.

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-Swiss (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.

Nigerian Operations

As previously disclosed, in November 2010 we finalized settlements with the SEC and the Department of Justice as the result of an internal investigation of the legality under the United States Foreign Corrupt Practices Act (“FCPA”) and local laws of certain reimbursement payments made by our Nigerian affiliate to our customs agents in Nigeria. In January 2011, a subsidiary of Noble-Swiss resolved an investigation by the Nigerian Economic and Financial Crimes Commission and the Nigerian Attorney General Office into these same activities. Any additional investigation by these or other agencies could damage our reputation and 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. Further, resolving any additional investigations could be expensive and consume significant time and attention of our senior management.

As of March 31, 2012, all four of our rigs operating in Nigeria were operating under temporary import permits. To date, we have been successful in obtaining new, or extending existing, temporary import permits. However, there can be no assurance that we will be able to obtain new permits or further extensions of permits necessary to continue the operation of our rigs in Nigeria. If we cannot obtain a new permit or an extension necessary to continue operations of any rig, we may need to cease operations under the drilling contract for such rig and relocate such rig from Nigerian waters. We cannot predict what impact these events may have on any such contract or our business in Nigeria, and we could face additional fines and sanctions in Nigeria. Furthermore, we cannot predict what changes, if any, relating to temporary import permit policies and procedures may be established or implemented in Nigeria in the future, or how any such changes may impact our business there.