10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

______________________________

FORM 10-Q

______________________________

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

For the quarterly period ended June 30, 2017

or

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

For the transition period from  ________ to ________                     

Commission File Number: 1-13245

______________________________ 

PIONEER NATURAL RESOURCES COMPANY

(Exact name of Registrant as specified in its charter)

______________________________

Delaware	75-2702753
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
5205 N. O'Connor Blvd., Suite 200, Irving, Texas	75039
(Address of principal executive offices)	(Zip Code)

(972) 444-9001

(Registrant's telephone number, including area code)

Not applicable

(Former name, former address and former fiscal year, if changed since last report)

______________________________

Indicate by check mark whether the 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  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, 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  ý    No   ¨

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

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	o (Do not check if a smaller reporting company)	Smaller reporting company	¨
		Emerging growth company	¨

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

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes   ¨    No  ý

Number of shares of Common Stock outstanding as of July 28, 2017170,097,565

PIONEER NATURAL RESOURCES COMPANY

TABLE OF CONTENTS

		Page
Cautionary Statement Concerning Forward-Looking Statements		3
Definitions of Certain Terms and Conventions Used Herein		4
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets as of June 30, 2017 and December 31, 2016	5
	Consolidated Statements of Operations for the three and six months ended June 30, 2017 and 2016	7
	Consolidated Statement of Equity for the six months ended June 30, 2017	8
	Consolidated Statements of Cash Flows for the six months ended June 30, 2017 and 2016	9
	Notes to Consolidated Financial Statements	10
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	24
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	33
Item 4.	Controls and Procedures	37
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	38
Item 1A.	Risk Factors	38
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	38
Item 4.	Mine Safety Disclosures	38
Item 6.	Exhibits	39
Signatures		40
Exhibit Index		41

2

PIONEER NATURAL RESOURCES COMPANY

Cautionary Statement Concerning Forward-Looking Statements

The information in this Quarterly Report on Form 10-Q (this "Report") contains forward-looking statements that involve risks and uncertainties. When used in this document, the words "believes," "plans," "expects," "anticipates," "forecasts," "intends," "continue," "may," "will," "could," "should," "future," "potential," "estimate" or the negative of such terms and similar expressions as they relate to Pioneer Natural Resources Company ("Pioneer" or the "Company") are intended to identify forward-looking statements, which are generally not historical in nature. The forward-looking statements are based on the Company's current expectations, assumptions, estimates and projections about the Company and the industry in which the Company operates. Although the Company believes that the expectations and assumptions reflected in the forward-looking statements are reasonable as and when made, they involve risks and uncertainties that are difficult to predict and, in many cases, beyond the Company's control.

These risks and uncertainties include, among other things, volatility of commodity prices, product supply and demand, competition, the ability to obtain environmental and other permits and the timing thereof, other government regulation or action, the ability to obtain approvals from third parties and negotiate agreements with third parties on mutually acceptable terms, litigation, the costs and results of drilling and operations, availability of equipment, services, resources and personnel required to perform the Company's drilling and operating activities, access to and availability of transportation, processing, fractionation and refining facilities, Pioneer's ability to replace reserves, implement its business plans or complete its development activities as scheduled, access to and cost of capital, the financial strength of counterparties to Pioneer's credit facility, investment instruments and derivative contracts and purchasers of Pioneer's oil, NGL and gas production, uncertainties about estimates of reserves, identification of drilling locations and the ability to add proved reserves in the future, the assumptions underlying production forecasts, quality of technical data, environmental and weather risks, including the possible impacts of climate change, the risks associated with the ownership and operation of the Company's industrial sand mining and oilfield services businesses, and acts of war or terrorism. These and other risks are described in the Company's Annual Report on Form 10-K, this and other Quarterly Reports on Form 10-Q and other filings with the United States Securities and Exchange Commission. In addition, the Company may be subject to currently unforeseen risks that may have a materially adverse effect on it. Accordingly, no assurances can be given that the actual events and results will not be materially different than the anticipated results described in the forward-looking statements. See "Part I, Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations," "Part 1, Item 3. Quantitative and Qualitative Disclosures About Market Risk" and "Part II, Item 1A. Risk Factors" in this Report and "Part I, Item 1. Business — Competition, Markets and Regulations," "Part I, Item 1A. Risk Factors," "Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Part II, Item 7A. Quantitative and Qualitative Disclosures About Market Risk" in the Company's Annual Report on Form 10-K for the year ended December 31, 2016 for a description of various factors that could materially affect the ability of Pioneer to achieve the anticipated results described in the forward-looking statements. Readers are cautioned not to place undue reliance on forward-looking statements, which speak only as of the date hereof. The Company undertakes no duty to publicly update these statements except as required by law.

3

PIONEER NATURAL RESOURCES COMPANY

Definitions of Certain Terms and Conventions Used Herein

Within this Report, the following terms and conventions have specific meanings:

• "Bbl" means a standard barrel containing 42 United States gallons.

• "BOE" means a barrel of oil equivalent and is a standard convention used to express oil and gas volumes on a comparable oil equivalent basis. Gas equivalents are determined under the relative energy content method by using the ratio of six thousand cubic feet of gas to one Bbl of oil or natural gas liquid.

• "BOEPD" means BOE per day.

• "Btu" means British thermal unit, which is a measure of the amount of energy required to raise the temperature of one pound of water one degree Fahrenheit.

• "Conway" means the daily average natural gas liquids components as priced in Oil Price Information Service ("OPIS") in the table "U.S. and Canada LP – Gas Weekly Averages" at Conway, Kansas.

• "DD&A" means depletion, depreciation and amortization.

• "GAAP" means accounting principles that are generally accepted in the United States of America.

• "LIBOR" means London Interbank Offered Rate, which is a market rate of interest.

• "Mcf" means one thousand cubic feet and is a measure of gas volume.

• "MMBtu" means one million Btus.

• "Mont Belvieu" means the daily average natural gas liquids components as priced in OPIS in the table "U.S. and Canada LP – Gas Weekly Averages" at Mont Belvieu, Texas.

• "NGL" means natural gas liquid.

• "NYMEX" means the New York Mercantile Exchange.

• "Pioneer" or the "Company" means Pioneer Natural Resources Company and its subsidiaries.

• "Proved reserves" mean the quantities of oil and gas, which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible – from a given date forward, from known reservoirs, and under existing economic conditions, operating methods, and government regulations – prior to the time at which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time.

(i) The area of the reservoir considered as proved includes: (A) The area identified by drilling and limited by fluid contacts, if any, and (B) Adjacent undrilled portions of the reservoir that can, with reasonable certainty, be judged to be continuous with it and to contain economically producible oil or gas on the basis of available geoscience and engineering data.

(ii) In the absence of data on fluid contacts, proved quantities in a reservoir are limited by the lowest known hydrocarbons ("LKH") as seen in a well penetration unless geoscience, engineering, or performance data and reliable technology establishes a lower contact with reasonable certainty.

(iii) Where direct observation from well penetrations has defined a highest known oil ("HKO") elevation and the potential exists for an associated gas cap, proved oil reserves may be assigned in the structurally higher portions of the reservoir only if geoscience, engineering, or performance data and reliable technology establish the higher contact with reasonable certainty.

(iv) Reserves which can be produced economically through application of improved recovery techniques (including, but not limited to, fluid injection) are included in the proved classification when: (A) Successful testing by a pilot project in an area of the reservoir with properties no more favorable than in the reservoir as a whole, the operation of an installed program in the reservoir or an analogous reservoir, or other evidence using reliable technology establishes the reasonable certainty of the engineering analysis on which the project or program was based; and (B) The project has been approved for development by all necessary parties and entities, including governmental entities.

(v) Existing economic conditions include prices and costs at which economic producibility from a reservoir is to be determined. The price shall be the average during the 12-month period prior to the ending date of the period covered by the report, determined as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period, unless prices are defined by contractual arrangements, excluding escalations based upon future conditions.

• "U.S." means United States.

• With respect to information on the working interest in wells, drilling locations and acreage, "net" wells, drilling locations and acres are determined by multiplying "gross" wells, drilling locations and acres by the Company's working interest in such wells, drilling locations or acres. Unless otherwise specified, wells, drilling locations and acreage statistics quoted herein represent gross wells, drilling locations or acres.

• Unless otherwise indicated, all currency amounts are expressed in U.S. dollars.

4

PART I. FINANCIAL INFORMATION

Item 1.Financial Statements

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED BALANCE SHEETS

(in millions)

	June 30, 2017			December 31, 2016
	(Unaudited)
ASSETS
Current assets:
Cash and cash equivalents	$	660		$	1,118
Short-term investments	1,539			1,441
Accounts receivable:
Trade, net	491			517
Due from affiliates	—			1
Income taxes receivable	1			3
Inventories	192			181
Derivatives	156			14
Other	25			23
Total current assets	3,064			3,298
Property, plant and equipment, at cost:
Oil and gas properties, using the successful efforts method of accounting:
Proved properties	18,983			18,566
Unproved properties	518			486
Accumulated depletion, depreciation and amortization	(8,505		)	(8,211		)
Total property, plant and equipment	10,996			10,841
Long-term investments	187			420
Goodwill	270			272
Other property and equipment, net	1,622			1,529
Derivatives	29			—
Other assets, net	103			99
	$	16,271		$	16,459

The financial information included as of June 30, 2017 has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

5

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED BALANCE SHEETS (continued)

(in millions, except share data)

	June 30, 2017			December 31, 2016
	(Unaudited)
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable:
Trade	$	881		$	741
Due to affiliates	63			134
Interest payable	59			68
Current portion of long-term debt	449			485
Derivatives	3			77
Other	103			61
Total current liabilities	1,558			1,566
Long-term debt	2,281			2,728
Derivatives	1			7
Deferred income taxes	1,487			1,397
Other liabilities	342			350
Equity:
Common stock, $.01 par value; 500,000,000 shares authorized; 173,782,802 and 173,221,845 shares issued as of June 30, 2017 and December 31, 2016, respectively	2			2
Additional paid-in capital	8,937			8,892
Treasury stock at cost: 3,685,802 and 3,497,742 shares as of June 30, 2017 and December 31, 2016, respectively	(254		)	(218		)
Retained earnings	1,912			1,728
Total equity attributable to common stockholders	10,597			10,404
Noncontrolling interests in consolidated subsidiaries	5			7
Total equity	10,602			10,411
Commitments and contingencies
	$	16,271		$	16,459

The financial information included as of June 30, 2017 has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

6

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF OPERATIONS

(in millions, except per share data)

(Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Revenues and other income:
Oil and gas	$	768		$	613		$	1,577		$	1,022
Sales of purchased oil and gas	517			395			1,001			618
Interest and other	16			6			30			13
Derivative gains (losses), net	135			(229		)	286			(186		)
Gain on disposition of assets, net	194			1			205			3
	1,630			786			3,099			1,470
Costs and expenses:
Oil and gas production	147			141			288			297
Production and ad valorem taxes	51			36			99			65
Depletion, depreciation and amortization	341			384			678			737
Purchased oil and gas	531			410			1,034			653
Impairment of oil and gas properties	—			—			285			32
Exploration and abandonments	26			18			59			77
General and administrative	81			80			165			154
Accretion of discount on asset retirement obligations	5			5			10			9
Interest	35			56			81			111
Other	59			67			119			154
	1,276			1,197			2,818			2,289
Income (loss) before income taxes	354			(411		)	281			(819		)
Income tax benefit (provision)	(121		)	143			(90		)	284
Net income (loss) attributable to common stockholders	$	233		$	(268	)	$	191		$	(535	)
Basic and diluted net income (loss) per share attributable to common stockholders	$	1.36		$	(1.63	)	$	1.11		$	(3.28	)
Basic and diluted weighted average shares outstanding	170			164			170			163
Dividends declared per share	$	—		$	—		$	0.04		$	0.04

The financial information included herein has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

7

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENT OF EQUITY

(in millions, except share data and dividends per share)

(Unaudited)

			Equity Attributable To Common Stockholders
	Shares Outstanding		Common Stock		Additional Paid-in Capital		Treasury Stock			Retained Earnings			Noncontrolling Interests			Total Equity
	(in thousands)
Balance as of December 31, 2016	169,724		$	2	$	8,892	$	(218	)	$	1,728		$	7		$	10,411
Dividends declared ($0.04 per share)	—		—		—		—			(7		)	—			(7		)
Purchases of treasury stock	(188	)	—		—		(36		)	—			—			(36		)
Compensation costs:
Vested compensation awards	561		—		—		—			—			—			—
Compensation costs included in net income	—		—		43		—			—			—			43
Purchase of noncontrolling interest	—		—		2		—			—			(2		)	—
Net income	—		—		—		—			191			—			191
Balance as of June 30, 2017	170,097		$	2	$	8,937	$	(254	)	$	1,912		$	5		$	10,602

The financial information included herein has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

8

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in millions)

(Unaudited)

	Six Months Ended June 30,
	2017			2016
Cash flows from operating activities:
Net income (loss)	$	191		$	(535	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion, depreciation and amortization	678			737
Impairment of oil and gas properties	285			32
Impairment of inventory and other property and equipment	1			5
Exploration expenses, including dry holes	18			40
Deferred income taxes	90			(284		)
Gain on disposition of assets, net	(205		)	(3		)
Accretion of discount on asset retirement obligations	10			9
Interest expense	2			9
Derivative related activity	(251		)	535
Amortization of stock-based compensation	43			44
Other	34			34
Change in operating assets and liabilities:
Accounts receivable	27			(51		)
Income taxes receivable	2			39
Inventories	(11		)	(12		)
Derivatives	—			(12		)
Investments	3			—
Other current assets	1			—
Accounts payable	(42		)	(60		)
Interest payable	(9		)	20
Income taxes payable	—			(2		)
Other current liabilities	(24		)	(26		)
Net cash provided by operating activities	843			519
Cash flows from investing activities:
Proceeds from disposition of assets, net of cash sold	345			2
Proceeds from investments	878			1
Purchase of investments	(746		)	(1,495		)
Additions to oil and gas properties	(1,074		)	(971		)
Additions to other assets and other property and equipment, net	(176		)	(126		)
Net cash used in investing activities	(773		)	(2,589		)
Cash flows from financing activities:
Principal payments on long-term debt	(485		)	—
Proceeds from issuance of common stock, net of issuance costs	—			2,534
Purchases of treasury stock	(36		)	(23		)
Dividends paid	(7		)	(7		)
Net cash provided by (used in) financing activities	(528		)	2,504
Net increase (decrease) in cash and cash equivalents	(458		)	434
Cash and cash equivalents, beginning of period	1,118			1,391
Cash and cash equivalents, end of period	$	660		$	1,825

The financial information included herein has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

9

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

NOTE A. Organization and Nature of Operations

Pioneer Natural Resources Company ("Pioneer" or the "Company") is a Delaware corporation whose common stock is listed and traded on the New York Stock Exchange. The Company is a large independent oil and gas exploration and production company that explores for, develops and produces oil, natural gas liquids ("NGLs") and gas within the United States, with operations primarily in the Permian Basin in West Texas, the Eagle Ford Shale play in South Texas, the Raton field in southeast Colorado and the West Panhandle field in the Texas Panhandle.

NOTE B. Basis of Presentation

Presentation. In the opinion of management, the consolidated financial statements of the Company as of June 30, 2017 and for the three and six months ended June 30, 2017 and 2016 include all adjustments and accruals, consisting only of normal, recurring accrual adjustments, which are necessary for a fair presentation of the results for the interim periods. These interim results are not necessarily indicative of results for a full year.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States ("GAAP") have been condensed in or omitted from this report pursuant to the rules and regulations of the United States Securities and Exchange Commission (the "SEC"). These consolidated financial statements should be read together with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

Certain reclassifications have been made to the 2016 financial statement and footnote amounts in order to conform to the 2017 presentation.

Issuance of common stock. During the first and second quarters of 2016, the Company issued 13.8 million and 6.0 million shares of common stock, respectively, and received cash proceeds of $1.6 billion and $937 million, respectively, net of associated underwriter discounts and offering expenses.

New accounting pronouncements. In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, "Improvements to Employee Share-Based Payment Accounting." ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as certain classification changes in the statement of cash flows. The Company adopted this standard on January 1, 2017. See Note M for discussion on the impact of the adoption to the Company's income tax provision.

In February 2016, the FASB issued ASU 2016-02, "Leases." ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases currently classified as operating leases and makes certain changes to the way lease expenses are accounted for. This update is effective for fiscal years beginning after December 15, 2018 and for interim periods beginning the following year. This update should be applied using a modified retrospective approach, and early adoption is permitted. The Company anticipates that the adoption of ASU 2016-02 for its leasing arrangements will likely (i) increase the Company's recorded assets and liabilities, (ii) increase depreciation, depletion and amortization expense, (iii) increase interest expense and (iv) decrease lease/rental expense. The Company is currently evaluating each of its lease arrangements and has not determined the aggregate amount of change expected for each category.

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," which supersedes the revenue recognition requirements in Accounting Standards Codification ("ASC") Topic 605, "Revenue Recognition," and most industry-specific guidance. ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. In August 2015, the FASB issued ASU 2015-14, which defers the effective date of ASU 2014-09 for one year to fiscal years beginning after December 15, 2017. Early adoption is permitted for fiscal years beginning after December 15, 2016. In May 2016, the FASB issued ASU 2016-11, which rescinded guidance from the SEC on accounting for gas balancing arrangements and will eliminate the use of the entitlements method. Entities have the option of using either a full retrospective or modified approach to adopt these new standards. The Company plans to utilize the modified approach to adopt the new standards upon their effective dates. The Company is evaluating the new guidance, including identifying revenue

10

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

streams and reviewing contracts and procedures currently in place. The Company does not anticipate this standard will have a material impact on its consolidated financial statements.

NOTE C. Acquisitions and Divestitures

Permian Basin Acquisition. In August 2016, the Company acquired approximately 28,000 net acres in the Permian Basin, with net production of approximately 1,400 barrels of oil equivalent per day ("BOEPD"), from an unaffiliated third party for $428 million, including normal closing adjustments. The acquisition was accounted for using the acquisition method under ASC 805, "Business Combinations," which requires acquired assets and liabilities to be recorded at fair value as of the acquisition date.

The following table represents the allocation of the acquisition price to the assets acquired and the liabilities assumed based on their fair value at the acquisition date (in millions):

Assets acquired:
Proved properties	$	79
Unproved properties	347
Other property and equipment	5
Liabilities assumed:
Asset retirement obligations	(2		)
Other liabilities	(1		)
Net assets acquired	$	428

The fair value measurements of the net assets acquired are based on inputs that are not observable in the market and, therefore, represent Level 3 inputs in the fair value hierarchy (see Note D for a description of the input levels in the fair value hierarchy). The Company calculated the fair values of the acquired proved properties and asset retirement obligations using a discounted future cash flow model that utilizes management's estimates of (i) proved reserves, (ii) forecasted production rates, (iii) future operating, development and plugging and abandonment costs, (iv) future commodity prices and (v) a discount rate of 10 percent for proved properties and seven percent for asset retirement obligations. The Company calculated the fair values of the acquired unproved properties based on the average price per acre in comparable market transactions. The operating results attributable to the acquired assets and liabilities assumed are included in the Company's accompanying consolidated statements of operations since the date of acquisition.

Divestitures. For the three and six months endedJune 30, 2017, the Company recorded net gains on the disposition of assets of $194 million and $205 million, respectively. For the three and six months ended June 30, 2016, the Company recorded net gains on the disposition of assets of $1 million and $3 million, respectively.

In April 2017, the Company completed the sale of approximately 20,500 acres in the Martin County region of the Permian Basin, with net production of approximately 1,500 BOEPD, to an unaffiliated third party for cash proceeds of $266 million, before normal closing adjustments. The sale resulted in a gain of $194 million. During the three months ended June 30, 2017, the Company reduced the carrying value of goodwill by $2 million, reflecting the portion of the Company's goodwill related to the assets sold.

During the six months ended June 30, 2017, the Company also completed the sales of other nonstrategic proved and unproved properties in the Permian Basin for cash proceeds of $77 million, which resulted in a gain of $10 million.

NOTE D. Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or the price paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are based upon inputs that market participants use in pricing an asset or liability, which are characterized according to a hierarchy that prioritizes those inputs based on the degree to which they are observable. Observable inputs represent market data obtained from independent sources, whereas unobservable inputs reflect a company's own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. The three input levels of the fair value hierarchy are as follows:

• Level 1 – quoted prices for identical assets or liabilities in active markets.

11

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

• Level 2 – quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates) and inputs derived principally from or corroborated by observable market data by correlation or other means.

• Level 3 – unobservable inputs for the asset or liability.

Assets and liabilities measured at fair value on a recurring basis. The fair value input hierarchy level to which an asset or liability measurement in its entirety falls is determined based on the lowest level input that is significant to the measurement in its entirety.

The following table presents the Company's assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016 for each of the fair value hierarchy levels:

	Fair Value Measurement as of June 30, 2017 Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value as of June 30, 2017
	(in millions)
Assets:
Commodity derivatives	$	—	$	180	$	—	$	180
Interest rate derivatives	—		5		—		5
Deferred compensation plan assets	87		—		—		87
Total assets	87		185		—		272
Liabilities:
Commodity derivatives	—		3		—		3
Diesel derivatives	—		1		—		1
Total liabilities	—		4		—		4
Total recurring fair value measurements	$	87	$	181	$	—	$	268

	Fair Value Measurement as of December 31, 2016 Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Fair value as of December 31, 2016
	(in millions)
Assets:
Commodity derivatives	$	—	$	8		$	—	$	8
Interest rate derivatives	—		6			—		6
Deferred compensation plan assets	83		—			—		83
Total assets	83		14			—		97
Liabilities:
Commodity derivatives	—		84			—		84
Total liabilities	—		84			—		84
Total recurring fair value measurements	$	83	$	(70	)	$	—	$	13

Commodity and diesel derivatives. The Company's commodity derivatives represent oil, NGL and gas swap contracts, collar contracts and collar contracts with short puts. The Company's diesel derivative liability represents swap contracts. The asset and liability measurements for these derivative contracts represent Level 2 inputs in the hierarchy. The Company utilizes discounted cash flow and option-pricing models for valuing its commodity and diesel derivatives.

12

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

The asset and liability values attributable to the Company's commodity and diesel derivatives were determined based on inputs that include (i) the contracted notional volumes, (ii) independent active market price quotes, (iii) the applicable estimated credit-adjusted risk-free rate yield curve and (iv) the implied rate of volatility inherent in the collar contracts and collar contracts with short puts, which is based on active and independent market-quoted volatility factors.

Deferred compensation plan assets. The Company's deferred compensation plan assets represent investments in equity and mutual fund securities that are actively traded on major exchanges. These investments are measured based on observable prices on major exchanges. As of June 30, 2017, the significant inputs to these asset values represented Level 1 independent active exchange market price inputs.

Interest rate derivatives. The Company's interest rate derivative assets represent interest rate swap contracts. The Company utilizes discounted cash flow models for valuing its interest rate derivatives. The derivative values attributable to the Company's interest rate derivative contracts are based on (i) the contracted notional amounts, (ii) forward active market-quoted London Interbank Offered Rates ("LIBOR") and (iii) the applicable credit-adjusted risk-free rate yield curve. The Company's interest rate derivative fair value measurements represent Level 2 inputs in the hierarchy.

Assets and liabilities measured at fair value on a nonrecurring basis. Certain assets and liabilities are measured at fair value on a nonrecurring basis. These assets and liabilities are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances. These assets and liabilities can include inventory, proved and unproved oil and gas properties and other long-lived assets or liabilities that are acquired or written down to fair value when they are impaired or held for sale. See Note C for information on the fair value of assets and liabilities acquired in the Permian Basin acquisition.

Proved oil and gas properties. As a result of the Company's proved property impairment assessments, the Company recognized noncash impairment charges to reduce the carrying values of (i) the Raton field during the three months ended March 31, 2017 and (ii) the West Panhandle field during the three months ended March 31, 2016 to their estimated fair values.

The Company calculated the fair values of the Raton and West Panhandle fields using a discounted future cash flow model. Significant Level 3 assumptions associated with the calculations included management's longer-term commodity price outlooks ("Management's Price Outlooks") and management's outlooks for (i) production, (ii) production costs, (iii) capital expenditures and (iv) estimated proved reserves and risk-adjusted probable reserves. Management's Price Outlooks are developed based on third-party longer-term commodity futures price outlooks as of each measurement date. The expected future net cash flows were discounted using an annual rate of 10 percent to determine fair value.

The following table presents the fair value and fair value adjustments (in millions) for the Company's 2017 and 2016 proved property impairments, as well as the average oil price per barrel ("Bbl") and gas price per British thermal unit ("MMBtu") utilized in the respective Management's Price Outlooks:

							Management's Price Outlooks
	Impairment Date	Fair Value		Fair Value Adjustment			Oil		Gas
Raton	March 2017	$	186	$	(285	)	$	53.65	$	3.00
West Panhandle	March 2016	$	33	$	(32	)	$	49.77	$	3.24

It is reasonably possible that the estimate of undiscounted future net cash flows attributable to these or other properties may change in the future resulting in the need to impair their carrying values. The primary factors that may affect estimates of future cash flows are (i) future adjustments, both positive and negative, to proved and risk-adjusted probable and possible oil and gas reserves, (ii) results of future drilling activities, (iii) Management's Price Outlooks and (iv) increases or decreases in production and capital costs associated with these reserves.

Unproved oil and gas properties. During March 2016, the Company recorded an impairment charge of $32 million to write-off the carrying value of its unproved royalty acreage in Alaska (reported in exploration and abandonments in the accompanying consolidated statements of operations) as a result of the operator curtailing operations in the area and Management's Price Outlooks.

13

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

Financial instruments not carried at fair value. Carrying values and fair values of financial instruments that are not carried at fair value in the accompanying consolidated balance sheets as of June 30, 2017 and December 31, 2016 are as follows:

	June 30, 2017				December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Commercial paper, corporate bonds and time deposits	$	1,726	$	1,723	$	1,906	$	1,901
Current portion of long-term debt	$	449	$	468	$	485	$	490
Long-term debt	$	2,281	$	2,490	$	2,728	$	2,956

Commercial paper, corporate bonds and time deposits. Periodically, the Company invests in commercial paper and corporate bonds with investment grade rated entities. The Company also periodically enters into time deposits with financial institutions. The investments are carried at amortized cost and classified as held-to-maturity as the Company has the intent and ability to hold them until they mature. The carrying values of held-to-maturity investments are adjusted for amortization of premiums and accretion of discounts over the remaining life of the investment. Income related to these investments is recorded in interest and other income in the Company's consolidated statements of operations. The Company's investments in corporate bonds represent Level 1 inputs in the hierarchy, while other investments represent Level 2 inputs in the hierarchy. Commercial paper and time deposits are included in cash and cash equivalents if they have maturity dates that are less than 90 days at the date of purchase; otherwise, investments are reflected in short-term investments or long-term investments in the accompanying consolidated balance sheets based on their maturity dates. The following table provides the components of the Company's cash and cash equivalents and investments as of June 30, 2017 and December 31, 2016:

	June 30, 2017
Consolidated Balance Sheet Location	Cash		Commercial Paper		Corporate Bonds		Time Deposits		Total
	(in millions)
Cash and cash equivalents	$	560	$	—	$	—	$	100	$	660
Short-term investments	—		138		865		536		1,539
Long-term investments	—		—		187		—		187
	$	560	$	138	$	1,052	$	636	$	2,386

	December 31, 2016
Consolidated Balance Sheet Location	Cash		Commercial Paper		Corporate Bonds		Time Deposits		Total
	(in millions)
Cash and cash equivalents	$	873	$	45	$	—	$	200	$	1,118
Short-term investments	—		368		691		382		1,441
Long-term investments	—		—		420		—		420
	$	873	$	413	$	1,111	$	582	$	2,979

Debt obligations. The Company's debt obligations are composed of its credit facility and senior notes. The fair value of the Company's debt obligations is determined utilizing inputs that are Level 2 measurements in the fair value hierarchy. The fair value of the Company's credit facility is calculated using a discounted cash flow model based on (i) forecasted contractual interest and fee payments, (ii) forward active market-quoted United States Treasury Bill rates and (iii) the applicable credit-adjustments. The Company's senior notes represent debt securities that are not actively traded on major exchanges. The fair values of the Company's senior notes are based on their periodic values as quoted on the major exchanges.

The Company has other financial instruments consisting primarily of receivables, payables and other current assets and liabilities that approximate fair value due to the nature of the instrument and their relatively short maturities. Non-financial assets

14

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

and liabilities initially measured at fair value include assets acquired and liabilities assumed in a business combination, goodwill and asset retirement obligations.

NOTE E. Derivative Financial Instruments

The Company utilizes commodity swap contracts, collar contracts and collar contracts with short puts to (i) reduce the effect of price volatility on the commodities the Company produces and sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. The Company also, from time to time, utilizes interest rate contracts to reduce the effect of interest rate volatility on the Company's indebtedness.

Periodically, the Company may pay a premium to enter into commodity contracts. Premiums paid, if any, have been nominal in relation to the value of the underlying asset in the contract. The Company recognizes the nominal premium payments as an increase to the value of derivative assets when paid. All derivatives are adjusted to fair value as of each balance sheet date.

Oil production derivative activities. All material physical sales contracts governing the Company's oil production are tied directly to, or are highly correlated with, New York Mercantile Exchange ("NYMEX") West Texas Intermediate ("WTI") oil prices. The Company uses derivative contracts to manage oil price volatility and basis swap contracts to reduce basis risk between NYMEX prices and the actual index prices at which the oil is sold.

The following table sets forth the volumes per day associated with the Company's outstanding oil derivative contracts as of June 30, 2017 and the weighted average oil prices for those contracts:

	2017				Year Ending December 31, 2018
	Third Quarter		Fourth Quarter
Collar contracts:
Volume (Bbl)	6,000		6,000		—
Price per Bbl:
Ceiling	$	70.40	$	70.40	$	—
Floor	$	50.00	$	50.00	$	—
Collar contracts with short puts (a):
Volume (Bbl)	147,000		155,000		71,000
Price per Bbl:
Ceiling	$	62.03	$	62.12	$	60.38
Floor	$	49.81	$	49.82	$	50.07
Short put	$	41.07	$	41.02	$	40.00

 ____________________

(a) Subsequent to June 30, 2017, the Company entered into additional oil collar contracts with short puts for 26,000 Bbl per day of 2018 production with a ceiling price of $55.01 per Bbl, a floor price of $45.00 per Bbl and a short put price of $35.00 per Bbl.

NGL production derivative activities. All material physical sales contracts governing the Company's NGL production are tied directly or indirectly to either Mont Belvieu, Texas or Conway, Kansas NGL component product prices. The Company uses derivative contracts to manage NGL component price volatility.

15

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

The following table sets forth the volumes per day associated with the Company's outstanding NGL derivative contracts as of June 30, 2017 and the weighted average NGL prices for those contracts:

	2017				Year Ending December 31,
	Third Quarter		Fourth Quarter		2018		2019
Butane collar contracts with short puts (a):
Volume (Bbl)	2,000		—		—		—
Price per Bbl:
Ceiling	$	36.12	$	—	$	—	$	—
Floor	$	29.25	$	—	$	—	$	—
Short put	$	23.40	$	—	$	—	$	—
Ethane collar contracts (b):
Volume (Bbl)	3,000		3,000		—		—
Price per Bbl:
Ceiling	$	11.83	$	11.83	$	—	$	—
Floor	$	8.68	$	8.68	$	—	$	—
Ethane basis swap contracts (c):
Volume (MMBtu)	6,920		6,920		6,920		6,920
Price differential ($/MMBtu)	$	1.60	$	1.60	$	1.60	$	1.60

 ____________________

(a) Represent collar contracts with short puts that reduce the price volatility of butane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(b) Represent collar contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(c) Represent basis swap contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices. The basis swap contracts fix the basis differential on a NYMEX Henry Hub ("HH") MMBtu equivalent basis. The Company will receive the HH price plus the price differential on 6,920 MMBtu per day, which is equivalent to 2,500 Bbls per day of ethane.

Gas production derivative activities. All material physical sales contracts governing the Company's gas production are tied directly or indirectly to HH gas prices or regional index prices where the gas is sold. The Company uses derivative contracts to manage gas price volatility and basis swap contracts to reduce basis risk between HH prices and actual index prices at which the gas is sold.

16

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

The following table sets forth the volumes per day associated with the Company's outstanding gas derivative contracts as of June 30, 2017 and the weighted average gas prices for those contracts:

	2017						Year Ending December 31, 2018
	Third Quarter			Fourth Quarter
Collar contracts with short puts:
Volume (MMBtu)	290,000			300,000			62,329
Price per MMBtu:
Ceiling	$	3.57		$	3.60		$	3.56
Floor	$	2.95		$	2.96		$	2.91
Short put	$	2.47		$	2.47		$	2.37
Basis swap contracts:
Mid-Continent index swap volume (MMBtu) (a)	45,000			45,000			—
Price differential ($/MMBtu)	$	(0.32	)	$	(0.32	)	$	—
Permian Basin index swap volume (MMBtu) (b)	—			26,522			39,945
Price differential ($/MMBtu)	$	—		$	0.30		$	0.30

____________________

(a) Represent swap contracts that fix the basis differentials between the index price at which the Company sells its Mid-Continent gas and the HH index price used in collar contracts with short puts.

(b) Represent swap contracts that fix the basis differentials between Permian Basin index prices and southern California index prices for Permian Basin gas forecasted for sale in southern California. Subsequent to June 30, 2017, the Company entered into additional basis swap contracts for 6,739 MMBtu per day of third quarter 2017 production with a price of $0.26 per MMBtu and 11,726 MMBtu per day of 2018 production with a price differential of $0.31 per MMBtu.

Diesel derivative activities. Periodically, the Company enters into diesel derivative swap contracts to mitigate fuel price risk. The diesel derivative swap contracts are priced at an index that is highly correlated to the prices that the Company incurs to fuel drilling rigs and its fracture stimulation fleet equipment. As of June 30, 2017, the Company was party to diesel derivative swap contracts for 1,000 Bbls per day for the remainder of 2017 at an average per Bbl fixed price of $63.00. Subsequent to June 30, 2017, the Company terminated its diesel derivative swap contracts for August through December 2017 for cash proceeds of $321 thousand.

Interest rate derivative activities. As of June 30, 2017, the Company was party to interest rate derivative contracts whereby the Company will receive the three-month LIBOR rate for the 10-year period from December 2017 through December 2027 in exchange for paying a fixed interest rate of 1.81 percent on a notional amount of $100 million on December 15, 2017.

Tabular disclosure of derivative financial instruments. All of the Company's derivatives are accounted for as non-hedge derivatives as of June 30, 2017 and December 31, 2016, and therefore all changes in the fair values of its derivative contracts are recognized as gains or losses in the earnings of the periods in which they occur. The Company classifies the fair value amounts of derivative assets and liabilities as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. The Company enters into derivatives under master netting arrangements, which, in an event of default, allows the Company to offset payables to and receivables from the defaulting counterparty.

17

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

The aggregate fair value of the Company's derivative instruments reported in the accompanying consolidated balance sheets by type and counterparty, including the classification between current and noncurrent assets and liabilities, consists of the following:

Fair Value of Derivative Instruments as of June 30, 2017
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in millions)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	153	$	(2	)	$	151
Interest rate derivatives	Derivatives - current	$	5	$	—		5
Commodity price derivatives	Derivatives - noncurrent	$	30	$	(1	)	29
							$	185
Liability Derivatives:
Commodity and diesel price derivatives	Derivatives - current	$	5	$	(2	)	$	3
Commodity price derivatives	Derivatives - noncurrent	$	2	$	(1	)	1
							$	4

Fair Value of Derivative Instruments as of December 31, 2016
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in millions)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	33	$	(25	)	$	8
Interest rate derivatives	Derivatives - current	$	6	$	—		6
							$	14
Liability Derivatives:
Commodity price derivatives	Derivatives - current	$	102	$	(25	)	$	77
Commodity price derivatives	Derivatives - noncurrent	$	7	$	—		7
							$	84

The Company uses credit and other financial criteria to evaluate the credit standing of, and to select, counterparties to its derivative instruments. Although the Company does not obtain collateral or otherwise secure the fair value of its derivative instruments, associated credit risk is mitigated by the Company's credit risk policies and procedures.

The following table details the location of gains and losses recognized on the Company's derivative contracts in the accompanying consolidated statements of operations:

Derivatives Not Designated as	Location of Gain / (Loss) Recognized in	Three Months Ended June 30,						Six Months Ended June 30,
Hedging Instruments	Earnings on Derivatives	2017			2016			2017			2016
		(in millions)
Commodity price derivatives	Derivative gains (losses), net	$	136		$	(222	)	$	287		$	(177	)
Interest rate derivatives	Derivative gains (losses), net	(1		)	(7		)	(1		)	(9		)
Total		$	135		$	(229	)	$	286		$	(186	)

18

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

NOTE F. Exploratory Costs

The Company capitalizes exploratory well and project costs until a determination is made that the well or project has either found proved reserves, is impaired or is sold. The Company's capitalized exploratory well and project costs are presented in proved properties in the accompanying consolidated balance sheets. If the exploratory well or project is determined to be impaired, the impaired costs are charged to exploration and abandonments expense.

The following table reflects the Company's capitalized exploratory well and project activity during the three and six months ended June 30, 2017:

	Three Months Ended June 30, 2017			Six Months Ended June 30, 2017
	(in millions)
Beginning capitalized exploratory well costs	$	432		$	323
Additions to exploratory well costs pending the determination of proved reserves	489			895
Reclassification due to determination of proved reserves	(477		)	(765		)
Exploratory well costs charged to exploration and abandonment expense	(1		)	(10		)
Ending capitalized exploratory well costs	$	443		$	443

The following table provides an aging as of June 30, 2017 and December 31, 2016 of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date drilling was completed:

	June 30, 2017		December 31, 2016
	(in millions, except well counts)
Capitalized exploratory well costs that have been suspended:
One year or less	$	420	$	318
More than one year	23		5
	$	443	$	323
Number of wells or projects with exploratory well costs that have been suspended for a period greater than one year	12		3

The 12 wells that were suspended for a period greater than one year as of June 30, 2017 are in the Eagle Ford Shale area. The Company expects to complete five of these wells in 2017 and the remaining seven wells in 2018.

NOTE G. Long-term Debt

Credit facility. The Company's long-term debt consists of senior notes, a revolving corporate credit facility (the "Credit Facility") and the effects of issuance costs and discounts. The Credit Facility is maintained with a syndicate of financial institutions and has aggregate loan commitments of $1.5 billion that expire in August 2020. As of June 30, 2017, the Company had no outstanding borrowings under the Credit Facility and was in compliance with its debt covenants.

Senior notes. The Company's 6.65% senior notes (the "6.65% Senior Notes") matured and were repaid in March 2017. The Company funded the $485 million repayment of the 6.65% Senior Notes with cash on hand. The Company's 6.875% senior notes (the "6.875% Senior Notes"), with an outstanding debt principal balance of $450 million, will mature in May 2018. The 6.875% Senior Notes are classified as current in the accompanying consolidated balance sheets as of June 30, 2017.

19

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

NOTE H. Incentive Plans

Stock-based compensation. For the three and six months ended June 30, 2017, the Company recorded $27 million and $57 million, respectively, of stock-based compensation expense for all plans, as compared to $29 million and $53 million for the same respective periods in 2016. As of June 30, 2017, there was $137 million of unrecognized stock-based compensation expense related to unvested share-based compensation plans, including $31 million attributable to stock-based awards that are expected to be settled on their vesting date in cash, rather than in equity shares ("Liability Awards"). The unrecognized compensation expense will be recognized on a straight-line basis over the remaining vesting periods of the awards, which is a period of less than three years on a weighted average basis. As of June 30, 2017 and December 31, 2016, accounts payable – due to affiliates included $10 million and $22 million, respectively, of liabilities attributable to Liability Awards.

The following table summarizes the activity that occurred during the six months ended June 30, 2017 for each type of share-based incentive award issued by Pioneer:

	Restricted Stock Equity Awards		Restricted Stock Liability Awards		Performance Units	Stock Options
Outstanding as of December 31, 2016	1,077,227		290,552		178,556	159,378
Awards granted	320,103		108,911		59,044	—
Awards forfeited	(13,527	)	(5,012	)	—	—
Awards vested	(437,845	)	(129,499	)	—	—
Outstanding as of June 30, 2017	945,958		264,952		237,600	159,378

NOTE I. Asset Retirement Obligations

The Company's asset retirement obligations primarily relate to the future plugging and abandonment of wells and related facilities. The following table summarizes the Company's asset retirement obligation activity during the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in millions)
Beginning asset retirement obligations	$	297		$	285		$	297		$	285
New wells placed on production	1			—			1			—
Changes in estimates	7			—			7			—
Dispositions	(7		)	—			(7		)	—
Liabilities settled	(9		)	(9		)	(14		)	(13		)
Accretion of discount	5			5			10			9
Ending asset retirement obligations	$	294		$	281		$	294		$	281

The Company records the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities, respectively, in the accompanying consolidated balance sheets. As of June 30, 2017 and December 31, 2016, the current portion of the Company's asset retirement obligations was $46 million and $39 million, respectively.

NOTE J. Commitments and Contingencies

In addition to the legal action described below, the Company is a party to other proceedings and claims incidental to its business. While many of these matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to such proceedings and claims will not have a material adverse effect on the Company's financial position as a whole or on its liquidity, capital resources or future annual results of operations. The Company records reserves for contingencies when information available indicates that a loss is probable and the amount of the loss can be reasonably estimated.

U.S. Environmental Protection Agency ("EPA") potential enforcement action.The Company has been advised by the EPA that the agency is considering an enforcement action against the Company and may seek monetary sanctions for alleged

20

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

failures to prevent emissions occurring at the Company's Fain gas plant in the West Panhandle region of Texas on five separate occasions. The Company has asserted defenses to the EPA's allegations and is in discussions with the EPA regarding these matters. Although the Company cannot predict the outcome of these discussions with any certainty, the Company believes such monetary sanctions will not exceed $45,000 for any single event, but could exceed $100,000 in the aggregate.

Obligations following divestitures.In connection with its divestiture transactions, the Company may retain certain liabilities and provide the purchaser certain indemnifications, subject to defined limitations, which may apply to identified pre-closing matters, including matters of litigation, environmental contingencies, royalty obligations and income taxes. The Company does not believe these obligations are probable of having a material impact on its liquidity, financial position or future results of operations.

Lease agreements. In June 2017, the Company entered into a 20-year operating lease for the Company's new corporate headquarters in Irving, TX. Annual base rent will be $33 million and lease payments are expected to commence in the second half of 2019 when the building is complete.

NOTE K. Interest and Other Income

The following table provides the components of the Company's interest and other income for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in millions)
Interest income	$	10	$	5	$	16	$	9
Severance and sales tax refunds	5		—		8		—
Deferred compensation plan income	1		—		3		2
Other income	—		1		3		2
Total interest and other income	$	16	$	6	$	30	$	13

21

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

NOTE L. Other Expense

The following table provides the components of the Company's other expense for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in millions)
Transportation commitment charges (a)	$	43	$	25	$	82	$	50
Loss from vertical integration services (b)	5		16		11		29
Idle drilling and well service equipment charges (c)	—		11		—		47
Other	11		15		26		28
Total other expense	$	59	$	67	$	119	$	154

 ____________________

(a) Primarily represents firm transportation payments on excess pipeline capacity commitments.

(b) Loss from vertical integration services primarily represents net margins (attributable to third party working interest owners) that result from Company-provided fracture stimulation and well service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three and six months ended June 30, 2017, these vertical integration net margins included $23 million and $42 million, respectively, of revenues and $28 million and $53 million, respectively, of costs and expenses. For the same respective periods in 2016, these vertical integration net margins included $56 million and $124 million of revenues and $72 million and $153 million of costs and expenses.

(c) Primarily represents expenses attributable to idle drilling rig fees that are not chargeable to joint operations and charges to terminate rig contracts that were not required to meet planned drilling activities.

NOTE M. Income Taxes

The Company's income tax benefit (provision) consisted of the following for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017		2016
	(in millions)
Deferred tax benefit (provision)	$	(121	)	$	143	(90	)	284

For the three and six months ended June 30, 2017, the Company's effective tax rate, excluding income attributable to noncontrolling interests, was 34 percent and 32 percent, respectively, as compared to an effective rate of 35 percent for both of the same respective periods in 2016. The Company's effective tax rate for the six months ended June 30, 2017 differs from the U.S. statutory rate of 35 percent primarily due to recognizing excess tax benefits of $8 million associated with the adoption of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," which requires excess tax benefits or deficiencies associated with the vesting of long-term incentive awards to be recorded as income tax expense or benefit in the statement of operations rather than as an adjustment to additional paid-in capital in the balance sheet.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based upon the technical merits of the position. As of June 30, 2017 and December 31, 2016, the Company had unrecognized tax benefits of $119 million and $112 million, respectively, resulting from research and experimental expenditures related to horizontal drilling and completions innovations. If all or a portion of the unrecognized tax benefit is sustained upon examination by the taxing authorities, the tax benefit will be recognized as a reduction to the Company's deferred tax liability and will affect the Company's effective tax rate in the period it is recognized. The Company expects to resolve the uncertainties associated with the unrecognized tax benefit by December 2018.

The Company files income tax returns in the U.S. federal and various state and foreign jurisdictions. The Internal Revenue Service has closed examinations of the 2012 and prior tax years and, with few exceptions, the Company believes that it is no longer subject to examinations by state and foreign tax authorities for years before 2011. As of June 30, 2017, no adjustments had been

22

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

proposed in any jurisdiction that would have a significant effect on the Company's liquidity, future results of operations or financial position.

NOTE N. Net Income (Loss) Per Share

The following table reconciles the Company's net income (loss) attributable to common stockholders to basic and diluted net income (loss) attributable to common stockholders for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in millions)
Net income (loss) attributable to common stockholders	$	233		$	(268	)	$	191		$	(535	)
Participating share-based earnings	(2		)	—			(2		)	—
Basic and diluted net income (loss) attributable to common stockholders	$	231		$	(268	)	$	189		$	(535	)

Basic and diluted weighted average common shares outstanding were 170 million for the three and six months ended June 30, 2017, respectively, as compared to 164 million and 163 million for the same respective periods in 2016.

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PIONEER NATURAL RESOURCES COMPANY

Item 2.Management's Discussion and Analysis of Financial Condition and Results of Operations

Financial and Operating Performance

The Company's financial and operating performance for the second quarter of 2017 included the following highlights:

• Net income attributable to common stockholders for the second quarter of 2017 was $233 million ($1.36 per diluted share), as compared to a net loss of $268 million ($1.63 per diluted share) for the second quarter of 2016. The primary components of the increase in net income attributable to common stockholders include:

• a $364 millionincrease in net derivative gains, primarily as a result of changes in forward commodity prices and the Company's portfolio of derivatives;

• a $193 million increase in net gain on disposition of assets, primarily due to recognizing a gain of $194 million on the sale of approximately 20,500 acres in the Martin County region of the Permian Basin during the second quarter of 2017;

• a $155 millionincrease in oil and gas revenues as a result of a 12 percentincrease in average realized commodity prices per BOE and an 11 percentincrease in sales volumes;

• a $43 milliondecrease in DD&A expense, primarily attributable to (i) commodity price increases and the Company's cost reduction initiatives, both of which had the effect of adding proved reserves by lengthening the economic lives of the Company's producing wells and (ii) additions to proved reserves attributable to the Company's successful Spraberry/Wolfcamp horizontal drilling program; and

• a $21 milliondecrease in interest expense, primarily due to the repayment of both the Company's 6.65% senior notes, which matured in March 2017, and the Company's 5.875% senior notes, which matured in July 2016; offset by

• a $264 million increase in the Company's income taxes as a result of the improvement in earnings during the three months ended June 30, 2017, as compared to the three months ended June 30, 2016; and

• a $21 millionincrease in total oil and gas production costs and production and ad valorem taxes, primarily due to the aforementioned increase in sales volumes and commodity prices.

• During the second quarter of 2017, average daily sales volumes increased by 11 percent to 259,087 BOEPD, as compared to 232,703 BOEPD during the second quarter of 2016. The increase in second quarter 2017 average daily sales volumes, as compared to the second quarter of 2016, is primarily due to the Company's successful Spraberry/Wolfcamp horizontal drilling program.

• Average oil, NGL and gas prices increased during the second quarter of 2017 to $45.00 per Bbl, $16.91 per Bbl and $2.62 per Mcf, respectively, as compared to $41.43 per Bbl, $14.21 per Bbl and $1.67 per Mcf, respectively, in the second quarter of 2016.

• Net cash provided by operating activities increased to $479 million for the three months ended June 30, 2017, as compared to $408 million for the three months ended June 30, 2016. The $71 millionincrease in net cash provided by operating activities is primarily due to increases in the Company's oil and gas revenues for the three months ended June 30, 2017 as a result of increases in commodity prices and sales volumes, partially offset by a $109 million reduction in cash provided by commodity derivatives during the three months ended June 30, 2017, as compared to the same period in 2016.

• As of June 30, 2017, the Company's net debt to book capitalization was three percent, as compared to two percent at December 31, 2016.

Third Quarter 2017 Outlook

Based on current estimates, the Company expects the following operating and financial results for the quarter ending September 30, 2017:

Production is forecasted to average 274,000 to 279,000 BOEPD.

Production costs (including production and ad valorem taxes and transportation costs) are expected to average $7.75 to $9.75 per BOE based on current NYMEX strip commodity prices. DD&A expense is expected to average $14.00 to $16.00 per BOE.

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PIONEER NATURAL RESOURCES COMPANY

Total exploration and abandonment expense is expected to be $20 million to $30 million. General and administrative expense is expected to be $80 million to $85 million. Interest expense is expected to be $33 million to $38 million, and other expense is expected to be $60 million to $70 million. Other expense is expected to include (i) $45 million to $50 million of charges associated with excess firm gathering and transportation commitments, (ii) $5 million to $10 million of losses (principally noncash) associated with the portion of vertical integration services provided to nonaffiliated working interest owners, including joint venture partners, in wells operated by the Company and (iii) other miscellaneous charges. Accretion of discount on asset retirement obligations is expected to be $4 million to $7 million.

The Company's effective income tax rate is expected to range from 35 percent to 40 percent. Current income taxes are expected to be less than $5 million.

Operations and Drilling Highlights

The following table summarizes the Company's average daily oil, NGL, gas and total production by asset area during the six months ended June 30, 2017:

	Oil (Bbls)	NGLs (Bbls)	Gas (Mcf)	Total (BOE)
Permian Basin	135,922	39,368	188,605	206,724
South Texas - Eagle Ford Shale	7,071	6,644	42,285	20,763
Raton Basin	—	—	89,591	14,932
West Panhandle	2,029	3,861	6,670	7,001
South Texas - Other	1,228	192	18,952	4,579
Other	5	1	46	13
Total	146,255	50,066	346,149	254,012

The Company's liquids production increased to 77 percent of total production on a BOE basis for the six months ended June 30, 2017, as compared to 74 percent for the same period last year.

The following table summarizes by geographic area the Company's finding and development costs incurred during the six months ended June 30, 2017:

	Acquisition Costs				Exploration		Development
	Proved		Unproved		Costs		Costs		Total
	(in millions)
Permian Basin	$	3	$	83	$	901	$	241	$	1,228
South Texas - Eagle Ford Shale	—		—		28		23		51
West Panhandle	—		—		1		5		6
Other	—		—		2		1		3
Total	$	3	$	83	$	932	$	270	$	1,288

The following table summarizes the Company's development and exploration/extension drilling activities for the six months ended June 30, 2017:

	Development Drilling
	Beginning Wells in Progress	Wells Spud	Successful Wells	Ending Wells in Progress
Permian Basin	8	15	4	19
South Texas - Eagle Ford Shale	4	1	3	2
Total	12	16	7	21

	Exploration/Extension Drilling
	Beginning Wells in Progress	Wells Spud	Successful Wells	Unsuccessful Wells	Ending Wells in Progress
Permian Basin	119	109	92	1	135
South Texas - Eagle Ford Shale	14	10	1	1	22
Total	133	119	93	2	157

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PIONEER NATURAL RESOURCES COMPANY

Permian Basin area. In the first half of 2017, the Company increased its rig count in the Spraberry/Wolfcamp area from 17 rigs at year-end 2016 to 18 rigs at June 30, 2017. The original forecast for 2017 assumed that approximately 260 horizontal wells would be placed on production during the year, weighted heavily to the second half of the year. However, due to unforeseen drilling delays during the first half of the year, the Company now expects to place approximately 230 horizontal wells on production (190 horizontal wells in the northern portion of the play and 40 horizontal wells in the southern portion of the play) during 2017. As a result, the associated planned capital spend is expected to be reduced from $2.4 billion to $2.3 billion. The Company plans to maintain efficient operations and does not intend to accelerate activity over the remainder of 2017 to catch up on the completions that were delayed, especially in light of the current commodity price environment. As a result, the Company will maintain its drilling rig activity, but will defer the completion of the approximately 30 wells into 2018. Approximately 55 percent of the horizontal wells are planned to be drilled in the Wolfcamp B interval, 30 percent in the Wolfcamp A interval and 15 percent in the Lower Spraberry Shale interval. The Company also plans to drill a small number of wells to appraise the shallower Clearfork formation, the Jo Mill interval within the Spraberry formation and the Wolfcamp D interval in the Wolfcamp formation during 2017. The Company's adjusted capital spend of $2.3 billion in the Spraberry/Wolfcamp field during 2017 includes $1.8 billion of horizontal drilling and completion capital, $265 million for tank battery and disposal facilities, $115 million for gas processing facilities and $110 million for land, science and other costs. During the first half of 2017, the Company successfully completed 89 horizontal wells in the northern portion of the play and seven horizontal wells in the southern portion of the play. In the northern portion of the play, approximately 55 percent of wells placed on production were Wolfcamp A interval wells, approximately 30 percent were Wolfcamp B interval wells and the remaining 15 percent were Lower Spraberry Shale wells. The majority of wells placed on production in the southern portion of the play were Wolfcamp A and B interval wells.

The Company continues to utilize its integrated services to control well costs and operating costs in addition to supporting the execution of its drilling and production activities in the Spraberry/Wolfcamp field. During the second quarter of 2017, the Company utilized up to seven of its eight Company-owned fracture stimulation fleets to support its drilling operations in the Spraberry/Wolfcamp field. The Company also owns other field service equipment that supports its drilling and production operations, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. In addition, Pioneer Sands LLC (the Company's wholly-owned sand mining subsidiary that was previously named Premier Silica LLC) is supplying high-quality and logistically advantaged brown sand for proppant, which is being used to fracture stimulate horizontal wells in the Spraberry and Wolfcamp Shale intervals.

The Company has been and continues to pursue initiatives to improve drilling and completion efficiencies and reduce costs. The most significant drilling and completion cost reductions to date have been for casing, tubing, materials for drilling and fracture stimulation, fuel charges, labor and transportation, rental equipment and well services, while efficiency gains include reducing the time needed to drill and complete the wells and optimizing completions in the Spraberry and Wolfcamp Shale intervals.

The Company's long-term growth plan continues to focus on optimizing the development of the field and addressing the future requirements for water sourcing and disposal, field infrastructure, gas processing, sand, pipeline takeaway capacity for its products, oilfield services, tubulars, electricity, buildings, roads and labor.

The Company is constructing a field-wide water distribution system to reduce the cost of water for drilling and completion activities and to ensure that adequate supplies of water are available to support the Company's long-term growth plan for the Spraberry/Wolfcamp field. The 2017 capital program includes $160 million for expansion of the mainline system, subsystems and frac ponds to efficiently deliver water to Pioneer's drilling locations. The Company signed an agreement with the city of Midland to upgrade the city's wastewater treatment plant in return for a dedicated long-term supply of water from the plant. The 2017 program includes $10 million of engineering capital to begin work on this upgrade. Pioneer expects to spend approximately $110 million over the 2017 through 2019 period for the Midland plant upgrade. In return, the Company will receive approximately two billion barrels of low-cost, non-potable water over a 28-year contract period (up to 240 thousand barrels per day) to support its completion operations. The water contract became effective during the second quarter of 2017 after the Texas Governor signed into law legislation that allows for this and similar public-private collaborations. The Company and the city of Midland are currently working to complete the design specifications for the wastewater treatment plant.

The Company's sand mine in Brady, Texas, which is strategically located within close proximity (approximately 190 miles) of the Spraberry/Wolfcamp field, provides a secure sand source for the Company's horizontal drilling program. The 2017 capital program includes $30 million to complete an optimization project for the Company's existing sand mining facilities. This project is expected to improve yields and reduce the Company's overall cost of sand supplies. The 2017 capital program also includes $45 million for upgrades and maintenance to the Company-owned pressure pumping fleets that the Company plans to operate during 2017.

Eagle Ford Shale area. During the first half of 2017, the Company operated two rigs in the Eagle Ford Shale area. The Company expects to spend $95 million of capital in 2017 to drill and complete 11 new Eagle Ford Shale wells and to complete

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PIONEER NATURAL RESOURCES COMPANY

nine wells that were drilled but not completed in 2016. The objective of this drilling program is to test longer laterals with higher intensity completions. During the first half of 2017, the Company successfully completed four wells in the Eagle Ford Shale area.

Results of Operations

Oil and gas revenues. Oil and gas revenues totaled $768 million and $1.6 billion for the three and six months ended June 30, 2017, respectively, as compared to $613 million and $1.0 billion for the same respective periods in 2016.

The increase in oil and gas revenues during the three months ended June 30, 2017, as compared to the same period in 2016, is primarily due to increases of nine percent, 19 percent and 57 percent in oil, NGL and gas prices, respectively, and increases of nine percent, 29 percent and four percent in daily oil, NGL and gas sales volumes, respectively. The increase in oil and gas revenues during the six months ended June 30, 2017, as compared to the same period in 2016, is primarily due to increases of 34 percent, 46 percent and 56 percent in oil, NGL and gas prices, respectively, and 14 percent and 24 percent increases in daily oil and NGL sales volumes, respectively.

The following table provides average daily sales volumes for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,		Six Months Ended June 30,
	2017	2016	2017	2016
Oil (Bbls)	146,884	134,723	146,255	128,762
NGLs (Bbls)	53,268	41,223	50,066	40,227
Gas (Mcf)	353,612	340,542	346,149	349,597
Total (BOEs)	259,087	232,703	254,012	227,256

Average daily BOE sales volumes increased by 11 percent and 12 percent for the three and six months ended June 30, 2017, respectively, as compared to the same respective periods in 2016, principally due to the Company's successful Spraberry/Wolfcamp horizontal drilling program. NGL production volumes are lower for the six months ended June 30, 2017 and 2016 by approximately 4,000 Bbls per day and 5,000 Bbls per day, respectively, due to voluntary reductions in recoveries of ethane as a result of it having a higher value if sold as part of the gas stream.

The oil, NGL and gas prices that the Company reports are based on the market prices received for each commodity. The following table provides the Company's average prices for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Oil (per Bbl)	$	45.00	$	41.43	$	47.01	$	35.07
NGL (per Bbl)	$	16.91	$	14.21	$	18.03	$	12.32
Gas (per Mcf)	$	2.62	$	1.67	$	2.70	$	1.73
Total (per BOE)	$	32.56	$	28.95	$	34.31	$	24.72

Sales of purchased oil and gas. The Company periodically enters into pipeline capacity commitments in order to secure available oil, NGL and gas transportation capacity from the Company’s areas of production. The Company enters into purchase transactions with third parties and separate sale transactions with third parties to diversify a portion of the Company's WTI oil sales to a Gulf Coast market price and to satisfy unused pipeline capacity commitments. Revenues and expenses from these transactions are presented on a gross basis as the Company acts as a principal in the transaction by assuming the risk and rewards of ownership, including credit risk, of the commodities purchased and assuming the responsibility to deliver the commodities sold. The net effect of third party purchases and sales of oil and gas for the three and six months ended June 30, 2017 was a loss of $14 million and $33 million, respectively, as compared to a loss of $15 million and $35 million for the same respective periods in 2016. Firm transportation payments on excess pipeline capacity commitments are included in other expense in the accompanying consolidated statements of operations. See Note L of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information on transportation commitment charges.

Interest and other income. Interest and other income for the three and six months ended June 30, 2017 was $16 million and $30 million, respectively, as compared to $6 million and $13 million for the same respective periods in 2016. The increase in interest and other income during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, was primarily due to (i) increases of $5 million and $7 million for the three and six months ended June 30, 2017, respectively, in interest income as a result of an increase in short-term and long-term investments and (ii) severance and sales tax refunds of

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PIONEER NATURAL RESOURCES COMPANY

$5 million and $8 million for the three and six months ended June 30, 2017, respectively. See Note K of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information.

Derivative gains, net. The Company utilizes commodity swap contracts, collar contracts and collar contracts with short puts to (i) reduce the effect of price volatility on the commodities the Company produces and sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. During the three and six months ended June 30, 2017, the Company recorded $135 million and $286 million, respectively, of net derivative gains on commodity price, diesel price and interest rate derivatives, of which $24 million and $35 million, respectively, represented net cash receipts. During the three and six months ended June 30, 2016, the Company recorded $229 million and $186 million of net derivative losses, respectively, on commodity price and interest rate derivatives, of which $132 million and $349 million, respectively, represented net cash receipts.

The following tables detail the net cash receipts on the Company's commodity derivatives and the relative price impact (per Bbl or Mcf) for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30, 2017					Six Months Ended June 30, 2017
	Net cash receipts		Price impact			Net cash receipts		Price impact
	(in millions)					(in millions)
Oil derivative receipts	$	21	$	1.59	per Bbl	$	33	$	1.22	per Bbl
NGL derivative receipts	1		$	0.01	per Bbl	1		$	0.02	per Bbl
Gas derivative receipts	1		$	0.02	per Mcf	—		$	—	per Mcf
Total net commodity derivative receipts	$	23				$	34

	Three Months Ended June 30, 2016					Six Months Ended June 30, 2016
	Net cash receipts		Price impact			Net cash receipts		Price impact
	(in millions)					(in millions)
Oil derivative receipts	$	110	$	8.97	per Bbl	$	303	$	12.93	per Bbl
NGL derivative receipts	1		$	0.19	per Bbl	5		$	0.63	per Bbl
Gas derivative receipts	21		$	0.68	per Mcf	41		$	0.65	per Mcf
Total net commodity derivative receipts	$	132				$	349

The Company's open derivative contracts are subject to continuing market risk. See Note E of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" and "Item 3. Quantitative and Qualitative Disclosures About Market Risk" for additional information regarding the Company's derivative contracts.

Gain on disposition of assets, net. The Company recorded net gains on the disposition of assets of $194 million and $205 million for the three and six months ended June 30, 2017, respectively, as compared to $1 million and $3 million for the same respective periods in 2016. For the three and six months ended June 30, 2017, the Company's gain on disposition of assets is primarily due to a gain of $194 million recognized on the sale of approximately 20,500 acres in the Martin County region of the Permian Basin. See Note C of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information regarding the Company's gain on disposition of assets.

Oil and gas production costs. The Company recognized oil and gas production costs of $147 million and $288 million during the three and six months ended June 30, 2017, respectively, as compared to $141 million and $297 million during the same respective periods in 2016. Lease operating expenses and workover costs represent the components of oil and gas production costs over which the Company has management control, while third-party transportation charges represent the cost to transport volumes produced to a sales point. Net natural gas plant/gathering charges represent the net costs to gather and process the Company's gas, reduced by net revenues earned from gathering and processing of third-party gas in Company-owned facilities.

Total oil and gas production costs per BOE for the three and six months ended June 30, 2017 decreased by 7 percent and 13 percent as compared to the same respective periods in 2016. The decrease in lease operating expenses per BOE during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, was primarily due to a greater proportion of the Company's production coming from horizontal wells in Spraberry/Wolfcamp area that have lower per BOE lease operating costs and cost reduction initiatives. The decrease in third-party transportation costs per BOE during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, was due to a lower proportion of the Company's total production being subject to higher Eagle Ford Shale transportation costs. The change in net natural gas plant charges per BOE during the

28

PIONEER NATURAL RESOURCES COMPANY

three and six months ended June 30, 2017, as compared to the same respective periods in 2016, is primarily reflective of increased earnings on third-party volumes that are processed in Company-owned facilities due to higher NGL and gas prices. The increase in workover costs per BOE during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, was primarily due to an increase in workover activity due to the improvement in commodity prices.

The following table provides the components of the Company's oil and gas production costs per BOE for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Lease operating expenses	$	4.79		$	4.95		$	4.89		$	5.20
Third-party transportation charges	0.82			1.47			0.91			1.61
Net natural gas plant (income) charges	(0.18		)	(0.01		)	(0.23		)	0.11
Workover costs	0.76			0.25			0.68			0.27
Total production costs	$	6.19		$	6.66		$	6.25		$	7.19

Production and ad valorem taxes. The Company's production and ad valorem taxes were $51 million and $99 million during the three and six months ended June 30, 2017, respectively, as compared to $36 million and $65 million for the same respective periods in 2016. In general, production and ad valorem taxes are directly related to commodity price changes; however, Texas ad valorem taxes are based upon prior year commodity prices, whereas production taxes are based upon current year commodity prices. The increase in production and ad valorem taxes per BOE for the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, is primarily due the increase in commodity prices and, for ad valorem tax purposes, the higher valuation attributable to the Company’s successful Spraberry/Wolfcamp horizontal drilling program.

The following table provides the Company's production and ad valorem taxes per BOE for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Production taxes	$	1.45	$	1.22	$	1.52	$	1.01
Ad valorem taxes	0.74		0.48		0.63		0.57
Total production and ad valorem taxes	$	2.19	$	1.70	$	2.15	$	1.58

Depletion, depreciation and amortization expense. The Company's DD&A expense was $341 million ($14.46 per BOE) and $678 million ($14.74 per BOE) for the three and six months ended June 30, 2017, respectively, as compared to $384 million ($18.14 per BOE) and $737 million ($17.82 per BOE) during the same respective periods in 2016. The change in per BOE DD&A expense during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, is primarily due to a decrease in depletion expense per BOE on oil and gas properties.

Depletion expense on oil and gas properties was $13.96 and $14.23 per BOE during the three and six months ended June 30, 2017, respectively, as compared to $17.62 and $17.29 per BOE during the same respective periods in 2016. The change in per BOE depletion expense during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, is primarily due to (i) commodity price increases and cost reduction initiatives, both of which had the effect of adding proved reserves by lengthening the economic lives of the Company's producing wells and (ii) additions to proved reserves attributable to the Company's successful Spraberry/Wolfcamp horizontal drilling program.

Impairment of oil and gas properties. The Company performs assessments of its long-lived assets to be held and used, including oil and gas properties, whenever events or circumstances indicate that the carrying value of those assets may not be recoverable. To the extent such assessments indicate a reduction of the estimated useful life or estimated future cash flows of the Company's oil and gas properties, the carrying value may not be recoverable and therefore an impairment charge would be required to reduce the carrying value of the proved properties to their fair value.

The cash flow model the Company uses to assess proved properties for impairment includes numerous assumptions. The primary factors that may affect estimates of future cash flows are (i) future reserve adjustments, both positive and negative, to proved reserves and appropriate risk-adjusted probable and possible reserves, (ii) results of future drilling activities, (iii) Management's Price Outlook and (iv) increases or decreases in production costs and capital costs associated with those reserves. All inputs to the cash flow model are evaluated at each measurement date.

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PIONEER NATURAL RESOURCES COMPANY

As a result of the Company's proved property impairment assessments, the Company recognized noncash impairment charges to reduce the carrying values of (i) the Raton field during the three months ended March 31, 2017 ($285 million impairment charge) and (ii) its West Panhandle field during the three months ended March 31, 2016 ($32 million impairment charge) to their estimated fair values. See Note D of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information regarding the Company's proved oil and gas property impairment charges.

Exploration and abandonments expense. The following table provides the Company's geological and geophysical costs, exploratory dry holes expenses and lease abandonments and other exploration expenses for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in millions)
Geological and geophysical	$	18	$	17	$	41	$	37
Exploratory well costs	1		—		10		—
Leasehold abandonments and other	7		1		8		40
	$	26	$	18	$	59	$	77

The geological and geophysical expenses for the three and six months ended June 30, 2017 and 2016 were primarily related to geological and geophysical personnel costs. During the six months ended June 30, 2016, the Company incurred leasehold abandonments primarily related to the abandonment of unproved properties in the Permian Basin and unproved acreage in Alaska in which the Company held an overriding royalty interest.

During the six months ended June 30, 2017, the Company drilled and evaluated 95 exploration/extension wells, 93 of which were successfully completed as discoveries. During the same period in 2016, the Company drilled and evaluated 106 exploration/extension wells, all of which were successfully completed as discoveries.

General and administrative expense. General and administrative expense for the three and six months ended June 30, 2017 was $81 million ($3.43 per BOE) and $165 million ($3.58 per BOE), respectively, as compared to $80 million ($3.77 per BOE) and $154 million ($3.72 per BOE) for the same respective periods in 2016. The decrease in general and administrative expense per BOE during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, was primarily due to increases of 11% and 12% in sales volumes during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016.

Accretion of discount on asset retirement obligations. Accretion of discount on asset retirement obligations was $5 million and $10 million for the three and six months ended June 30, 2017, respectively, as compared to $5 million and $9 million for the same respective periods in 2016. See Note I of Notes to Consolidated Financial Statements in "Item 1. Financial Statements" for information regarding the Company's asset retirement obligations.

Interest expense. Interest expense was $35 million and $81 million for the three and six months ended June 30, 2017, respectively, as compared to $56 million and $111 million for the same respective periods in 2016. The decrease in interest expense during the three and six months ended June 30, 2017, as compared to the same respective periods in 2016, was primarily due to the repayment of both the Company's 6.65% senior notes, which matured in March 2017, and the Company's 5.875% senior notes that matured in July 2016. The weighted average interest rates on the Company's indebtedness for the three and six months ended June 30, 2017, including the effects of capitalized interest, was 5.6 percent and 5.7 percent, respectively, as compared to 6.2 percent for both of the same respective periods in 2016.

Other expense. Other expense was $59 million and $119 million for the three and six months ended June 30, 2017, respectively, as compared to $67 million and $154 million during the same respective periods in 2016. The decrease in other expense for the three months ended June 30, 2017, as compared to the same period in 2016, was primarily due to (i) a decrease of $11 million in net losses from Company-provided fracture stimulation and related service operations that are provided to third party working interest owners and (ii) a decrease of $11 million in idle drilling and well service equipment charges, partially offset by (iii) an increase of $18 million in unused firm transportation costs. The decrease in other expense for the six months ended June 30, 2017, as compared to the same period in 2016, was primarily due to (i) a decrease of $47 million in idle drilling and well service equipment charges and (ii) a decrease of $18 million in net losses from Company-provided fracture stimulation and related service operations that are provided to third party working interest owners, partially offset by (iii) an increase of $32 million in unused firm transportation costs.

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PIONEER NATURAL RESOURCES COMPANY

The Company expects to continue to incur charges associated with excess firm gathering and transportation commitments and vertical integration operations until commodity prices improve, allowing the Company to increase its drilling activities, or, in the case of gathering and transportation commitments, the contractual obligations expire. Based on current drilling plans for 2017, the Company does not expect to incur any idle drilling rig charges. See Note L of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information.

Income tax benefit (provision). The Company recognized an income tax provision of $121 million and $90 million for the three and six months ended June 30, 2017, respectively, as compared to an income tax benefit of $143 million and $284 million for the same respective periods in 2016. The Company's effective tax rate for the three and six months ended June 30, 2017 was 34 percent and 32 percent, respectively, as compared to 35 percent for both of the same respective periods in 2016. The Company's effective tax rate for the six months ended June 30, 2017 differs from the U.S. statutory rate of 35 percent primarily due to recognizing excess tax benefits of $8 million during the three months ended March 31, 2017 associated with the adoption of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," which requires excess tax benefits or deficiencies associated with the vesting of long-term incentive awards to be recorded as income tax expense or benefit in the statement of operations rather than as an adjustment to additional paid-in capital in the balance sheet.

As of June 30, 2017 and December 31, 2016, the Company had unrecognized tax benefits of $119 million and $112 million respectively, resulting from research and experimental expenditures related to horizontal drilling and completions innovations. If all or a portion of the unrecognized tax benefit is sustained upon examination by the taxing authorities, the tax benefit will be recognized as a reduction to the Company's deferred tax liability and will affect the Company's effective tax rate in the period it is recognized. The Company expects to resolve the uncertainties associated with the unrecognized tax benefit by December 2018. See Note M of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information regarding the Company's income taxes.

Capital Commitments, Capital Resources and Liquidity

Capital commitments. The Company's primary needs for cash are for capital expenditures and acquisition expenditures on oil and gas properties and related vertical integration assets and facilities, payment of contractual obligations, including debt maturities, dividends and working capital obligations. Funding for these cash needs may be provided by any combination of internally-generated cash flow, cash and cash equivalents on hand, sales of short-term and long-term investments, proceeds from divestitures of nonstrategic assets or external financing sources as discussed in "Capital resources" below.

The Company's capital budget for 2017 has been reduced from $2.8 billion to $2.7 billion (excluding acquisitions, asset retirement obligations, capitalized interest, geological and geophysical administrative costs and information technology system upgrades), consisting of $2.4 billion for drilling operations and $275 million for water infrastructure, vertical integration and field facilities. The reduction reflects the decision to defer completing approximately 30 Spraberry/Wolfcamp horizontal wells into 2018. The Company's capital expenditures during the six months ended June 30, 2017 were $1.3 billion, consisting of $1.2 billion for drilling operations (excluding acquisitions, asset retirement obligations, capitalized interest and geological and geophysical administrative costs) and $175 million for water infrastructure, vertical integration, system upgrades and other plant and equipment additions. Based on results for the six months ended June 30, 2017 and Management's Price Outlook, the Company expects its net cash flows from operating activities, cash and cash equivalents on hand, sales of short-term and long-term investments, proceeds from divestitures of nonstrategic assets and, if necessary, availability under the Credit Facility to be sufficient to fund its planned capital expenditures, acquisitions and contractual obligations, including debt maturities.

Investing activities. Investing activities used $773 million of cash during the six months ended June 30, 2017, as compared to $2.6 billion during the six months ended June 30, 2016. The decrease in cash used in investing activities during the six months ended June 30, 2017, as compared to the same period in 2016, is primarily due to proceeds from the maturity of investments (commercial paper, corporate bonds and time deposits) of $878 million during the six months ended June 30, 2017, as compared to $1 million during the same period in 2016, and investment purchases of $746 million during the six months ended June 30, 2017, as compared to $1.5 billion during the same period in 2016. During the six months ended June 30, 2017, the Company's expenditures for investing activities were primarily funded by net cash provided by operating activities.

Dividends/distributions. During March of 2017 and 2016, the Board declared semiannual dividends of $0.04 per common share. Future dividends are at the discretion of the Board, and, if declared, the Board may change the current dividend amount based on the Company's liquidity and capital resources at the time.

Contractual obligations, including off-balance sheet obligations. The Company's contractual obligations include long-term debt, operating leases, drilling commitments (primarily related to commitments to pay day rates for contracted drilling rigs), capital funding obligations, derivative obligations, firm transportation and fractionation commitments, minimum annual gathering, processing and transportation commitments and other liabilities (including postretirement benefit obligations).

From time-to-time, the Company enters into arrangements and transactions that can give rise to material off-balance sheet obligations of the Company. As of June 30, 2017, the material off-balance sheet arrangements and transactions that the Company had entered into included (i) operating lease agreements, (ii) drilling commitments, (iii) firm purchase, transportation and fractionation commitments, (iv) open purchase commitments and (v) contractual obligations for which the ultimate settlement amounts are not fixed and determinable. The contractual obligations for which the ultimate settlement amounts are not fixed and determinable include (i) derivative contracts that are sensitive to future changes in commodity prices or interest rates, (ii) gathering, processing (primarily treating and fractionation) and transportation commitments on uncertain volumes of future throughput, (iii) open delivery commitments and (iv) indemnification obligations following certain divestitures. Other than the off-balance sheet arrangements described above, the Company has no transactions, arrangements or other relationships with unconsolidated entities or other parties that are reasonably likely to materially affect the Company's liquidity or availability of or requirements for capital resources. The Company expects to enter into similar contractual arrangements in the future, including incremental derivative contracts and additional firm purchase and transportation arrangements, in order to support the Company’s business plans.

There were no material changes to the Company's contractual obligations during the first half of 2017 other than the repayment of the Company's 6.65% Senior Notes in March 2017 and the commitment to a 20-year operating lease for the Company's new corporate headquarters in June 2017. Annual base rent on the new corporate headquarters will be $33 million and lease payments are expected to commence in the second half of 2019 when the building is complete.

The Company's commodity and interest rate derivative contracts are periodically measured and recorded at fair value and continue to be subject to market and credit risk. As of June 30, 2017, these contracts represented net assets of $181 million. The ultimate liquidation value of the Company's commodity and interest rate derivatives will be dependent upon actual future commodity prices and interest rates, which may differ materially from the inputs used to determine the derivatives' fair values as of June 30, 2017. See Note E of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" and "Item 3. Quantitative and Qualitative Disclosures About Market Risk" for additional information about the Company's derivative instruments and market risk.

Capital resources. The Company's primary capital resources are cash and cash equivalents, short-term and long-term investments, net cash provided by operating activities, proceeds from divestitures and proceeds from financing activities (principally borrowings under the Company's Credit Facility or issuances of debt or equity securities). If internal cash flows do not meet the Company's expectations, the Company may reduce its level of capital expenditures, and/or fund a portion of its capital expenditures (i) using cash on hand, (ii) through sales of short-term and long-term investments, (iii) with borrowings under the Company's Credit Facility, (iv) through issuances of debt or equity securities or (v) through other sources, such as sales of nonstrategic assets.

Operating activities. Net cash provided by operating activities during the six months ended June 30, 2017 was $843 million, as compared to $519 million during the same period in 2016. The increase in net cash provided by operating activities for the six months ended June 30, 2017, as compared to the same period in 2016, is primarily due to increases in the Company's oil and gas revenues for the six months ended June 30, 2017 as a result of increases in commodity prices and sales volumes, partially offset by a $315 million reduction in cash provided by commodity derivatives during the six months ended June 30, 2017, as compared to the same period in 2016.

Financing activities. Net cash used by financing activities during the six months ended June 30, 2017 was $528 million, as compared to net cash provided by financing activities of $2.5 billion during the same period in 2016. The decrease in net cash provided by financing activities during the six months ended June 30, 2017, as compared to the same period in 2016, is primarily due to the Company's issuance of 19.8 million shares of common stock during the first half of 2016 for cash proceeds of $2.5 billion and the principal repayment of $485 million attributable to the Company's 6.65% Senior Notes that matured in March 2017.

As the Company pursues its strategy, it may utilize various financing sources, including fixed and floating rate debt, convertible securities, preferred stock or common stock. The Company cannot predict the timing or ultimate outcome of any such actions as they are subject to market conditions, among other factors. The Company may also issue securities in exchange for oil and gas properties, stock or other interests in other oil and gas companies or related assets. Additional securities may be of a class preferred to common stock with respect to such matters as dividends and liquidation rights and may also have other rights and preferences as determined by the Board.

Liquidity. The Company's principal sources of short-term liquidity are cash and cash equivalents, sales of short-term and long-term investments and unused borrowing capacity under its Credit Facility. As of June 30, 2017, the Company had no outstanding borrowings under its Credit Facility, leaving $1.5 billion of unused borrowing capacity. The Company was in compliance with all of its debt covenants as of June 30, 2017. The Company also had cash on hand of $660 million, short-term investments of $1.5 billion and long-term investments of $187 million as of June 30, 2017. If internal cash flows do not meet the Company's expectations, the Company may fund a portion of its capital expenditures using cash on hand, sales of short-term and long-term investments, availability under its Credit Facility, issuances of debt or equity securities or other sources, such as sales

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PIONEER NATURAL RESOURCES COMPANY

of nonstrategic assets and/or reduce its level of capital expenditures or reduce dividend payments. The Company cannot provide any assurance that needed short- term or long-term liquidity will be available on acceptable terms or at all. Although the Company expects that the combination of internal operating cash flows, cash and cash equivalents on hand, sales of short-term and long-term investments, proceeds from divestitures of nonstrategic assets and, if necessary, available capacity under the Company's Credit Facility will be adequate for the remainder of 2017 to fund planned capital expenditures, acquisitions, dividend payments and provide adequate liquidity to fund other needs, no assurances can be given that such funding sources will be adequate to meet the Company's future needs.

Debt ratings. The Company is rated as mid-investment grade by three credit rating agencies. The Company receives debt credit ratings from several of the major ratings agencies, which are subject to regular reviews. The Company believes that each of the rating agencies considers many factors in determining the Company's ratings including: (i) production growth opportunities, (ii) liquidity, (iii) debt levels, (iv) asset composition and (v) proved reserve mix. A reduction in the Company's debt ratings could increase the interest rates that the Company incurs on Credit Facility borrowings and could negatively impact the Company's ability to obtain additional financing or the interest rate, fees and other terms associated with such additional financing.

Book capitalization and current ratio. The Company's net book capitalization at June 30, 2017 was $10.9 billion, consisting of $660 million of cash and cash equivalents, short-term and long-term investments of $1.7 billion, debt of $2.7 billion and equity of $10.6 billion. The Company's net debt to net book capitalization increased to three percent at June 30, 2017 from two percent at December 31, 2016. The Company's ratio of current assets to current liabilities decreased to 1.97 to 1.00 at June 30, 2017, as compared to 2.11 to 1.00 at December 31, 2016, primarily due to the reclassification of the Company's 6.875% Senior Notes to a current liability.

New accounting pronouncements. The effects of new accounting pronouncements are discussed in Note B of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements."

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PIONEER NATURAL RESOURCES COMPANY

Item 3.Quantitative and Qualitative Disclosures About Market Risk

The following quantitative and qualitative disclosures about market risk are supplementary to the quantitative and qualitative disclosures provided in the Company's Annual Report on Form 10-K for the year ended December 31, 2016. As such, the information contained herein should be read in conjunction with the related disclosures in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

The primary objective of the following information is to provide forward-looking quantitative and qualitative information about the Company's potential exposure to market risks. The term "market risks," insofar as it relates to currently anticipated transactions of the Company, refers to the risk of loss arising from changes in commodity prices and interest rates. These disclosures are not meant to be precise indicators of expected future losses, but rather indicators of reasonably possible losses. This forward-looking information provides indicators regarding how the Company views and manages ongoing market risk exposures. None of the Company's market risk sensitive instruments are entered into for speculative purposes.

The following table reconciles the changes that occurred in the fair values of the Company's open derivative contracts during the six months ending June 30, 2017:

	Derivative Contract Net Assets
	Commodities			Interest Rates			Total
	(in millions)
Fair value of contracts outstanding as of December 31, 2016	$	(76	)	$	6		$	(70	)
Changes in contract fair value	287			(1		)	286
Contract maturity receipts	(33		)	—			(33		)
Contract termination receipts	(2		)	—			(2		)
Fair value of contracts outstanding as of June 30, 2017	$	176		$	5		$	181

Interest rate sensitivity. See Note G of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" and Capital Commitments, Capital Resources and Liquidity included in "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations" for information regarding the Company's long-term debt.

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PIONEER NATURAL RESOURCES COMPANY

The following table provides information about financial instruments to which the Company was a party as of June 30, 2017 and that are sensitive to changes in interest rates. The table presents debt maturities by expected maturity dates, the weighted average interest rates expected to be paid on the debt given current contractual terms and market conditions and the aggregate estimated fair value of the Company's outstanding debt. For fixed rate debt, the weighted average interest rates represent the contractual fixed rates that the Company was obligated to periodically pay on the debt as of June 30, 2017. Although the Company had no outstanding variable rate debt as of June 30, 2017, the average variable contractual rates for its Credit Facility (that matures in August 2020) projected forward proportionate to the forward yield curve for LIBOR on July 28, 2017 is presented in the table below.

	Six Months Ending December 31,			Year Ending December 31,																	Asset (Liability) Fair Value at June 30,
	2017			2018			2019			2020			2021			Thereafter			Total		2017
	(dollars in millions)
Total Debt:
Fixed rate principal maturities (a)	$	—		$	450		$	—		$	450		$	500		$	1,350		$	2,750	$	(2,958	)
Weighted average fixed interest rate	5.31		%	5.11		%	5.00		%	4.42		%	4.72		%	5.49		%
Average variable interest rate	2.89		%	3.12		%	3.36		%	3.57		%
Interest Rate Swaps:
Notional debt amount (b)	$	100		$	—		$	—		$	—		$	—		$	—				$	5
Fixed rate payable (%)	1.81		%
Variable rate receivable (%) (c)	2.30		%

 ____________________

(a) Represents maturities of principal amounts, excluding debt issuance costs and debt issuance discounts.

(b) As of June 30, 2017, the Company was party to interest rate derivative contracts whereby the Company will receive the three-month LIBOR rate for the 10-year period from December 2017 through December 2027 in exchange for paying a fixed interest rate of 1.81 percent on a notional amount of $100 million on December 15, 2017.

(c) The variable rate receivable represents the July 28, 2017 forecasted three-month LIBOR rate for the 10-year period from December 2017 through December 2027.

Commodity derivative instruments and price sensitivity. The following table provides information about the Company's oil, NGL and gas derivative financial instruments that were sensitive to changes in oil, NGL and gas prices as of June 30, 2017. Although mitigated by the Company's derivative activities, declines in oil, NGL and gas prices would reduce the Company's revenues.

The Company manages commodity price risk with derivative contracts, such as swap contracts, collar contracts and collar contracts with short put options. Swap contracts provide a fixed price for a notional amount of sales volumes. Collar contracts provide minimum ("floor" or "long put") and maximum ("ceiling") prices on a notional amount of sales volumes, thereby allowing some price participation if the relevant index price closes above the floor price. Collar contracts with short put options differ from other collar contracts by virtue of the short put option price, below which the Company's realized price will exceed the variable market prices by the long put-to-short put price differential.

See Notes D and E of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for a description of the accounting procedures followed by the Company for its derivative financial instruments and for specific information regarding the terms of the Company's derivative financial instruments that are sensitive to changes in oil, NGL or gas prices.

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PIONEER NATURAL RESOURCES COMPANY

	2017						Year Ending December 31,				Asset (Liability) Fair Value at June 30, 2017 (a)
	Third Quarter			Fourth Quarter			2018		2019
											(in millions)
Oil Derivatives:
Average daily notional Bbl volumes:
Collar contracts	6,000			6,000			—		—		$	5
Weighted average ceiling price per Bbl	$	70.40		$	70.40		$	—	$	—
Weighted average floor price per Bbl	$	50.00		$	50.00		$	—	$	—
Collar contracts with short puts (b)	147,000			155,000			71,000		—		$	170
Weighted average ceiling price per Bbl	$	62.03		$	62.12		$	60.38	$	—
Weighted average floor price per Bbl	$	49.81		$	49.82		$	50.07	$	—
Weighted average short put price per Bbl	$	41.07		$	41.02		$	40.00	$	—
Average forward NYMEX oil prices (c)	$	49.71		$	49.91		$	50.06	$	—
NGL Derivatives:
Butane collar contracts with short puts (Bbl) (d):	2,000			—			—		—		$	(1	)
Weighted average ceiling price per Bbl	$	36.12		$	—		$	—	$	—
Weighted average floor price per Bbl	$	29.25		$	—		$	—	$	—
Weighted average short put price per Bbl	$	23.40		$	—		$	—	$	—
Average forward butane prices (c)	$	37.07		$	—		$	—	$	—
Ethane collar contracts (Bbl) (e)	3,000			3,000			—		—		$	—
Weighted average ceiling price per Bbl	$	11.83		$	11.83		$	—	$	—
Weighted average floor price per Bbl	$	8.68		$	8.68		$	—	$	—
Average forward ethane prices (c)	$	10.97		$	11.18		$	—	$	—
Ethane basis swap contracts (MMBtu) (f)	6,920			6,920			6,920		6,920		$	1
Weighted average price differential per MMBtu	$	1.60		$	1.60		$	1.60	$	1.60
Average forward NYMEX gas prices (c)	$	2.94		$	3.09		$	2.98	$	2.81
Gas Derivatives:
Average daily notional MMBtu volumes:
Collar contracts with short puts	290,000			300,000			62,329		—		$	2
Weighted average ceiling price per MMBtu	$	3.57		$	3.60		$	3.56	$	—
Weighted average floor price per MMBtu	$	2.95		$	2.96		$	2.91	$	—
Weighted average short put price per MMBtu	$	2.47		$	2.47		$	2.37	$	—
Average forward NYMEX gas prices (c)	$	2.94		$	3.09		$	2.98	$	—
Basis swap contracts:											$	—
Mid-Continent index swap contracts (g)	45,000			45,000			—		—
Weighted average fixed price per MMBtu	$	(0.32	)	$	(0.32	)	$	—	$	—
Average forward basis differential prices (h)	$	(0.34	)	$	(0.35	)	$	—	$	—
Permian Basin index swap contracts (i)	—			26,522			39,945		—
Weighted average fixed price per MMBtu	$	—		$	0.30		$	0.30	$	—
Average forward basis differential prices (j)	$	—		$	0.27		$	0.33	$	—

___________________

(a) In accordance with Financial Accounting Standards Board ASC 210-20 and ASC 815-10, the Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net derivative assets or net derivative liabilities, as the case may be. The net asset and liability amounts shown above have been provided on a commodity contract-type basis, which may differ from their master netting arrangements classifications.

(b) Subsequent to June 30, 2017, the Company entered into additional oil collar contracts with short puts for 26,000 Bbl per day of 2018 production with a ceiling price of $55.01 per Bbl, a floor price of $45.00 per Bbl and a short put price of $35.00 per Bbl.

(c) The average forward NYMEX oil, butane, ethane, and gas prices are based on July 28, 2017 market quotes.

(d) Represent collar contracts with short puts that reduce the price volatility of butane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(e) Represent collar contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

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PIONEER NATURAL RESOURCES COMPANY

(f) Represent basis swap contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices. The basis swap contracts fix the basis differential on a HH MMBtu equivalent basis. The Company will receive the HH price plus the price differential on 6,920 MMBtu per day, which is equivalent to 2,500 Bbls per day of ethane.

(g) Represent swap contracts that fix the basis differentials between the index prices at which the Company sells its Mid-Continent gas and the HH index price used in collar contracts with short puts.

(h) The average forward basis differential prices are based on July 28, 2017 market quotes for basis differentials between the relevant index prices and the NYMEX-quoted forward prices.

(i) Represent swap contracts that fix the basis differentials between Permian Basin index prices and southern California index prices for Permian Basin gas forecasted for sale in southern California. Subsequent to June 30, 2017, the Company entered into additional basis swap contracts for 6,739 MMBtu per day of third quarter 2017 production with a price of $0.26 per MMBtu and 11,726 MMBtu per day of 2018 production with a price differential of $0.31 per MMBtu.

(j) The average forward basis differential prices are based on July 28, 2017 market quotes for basis differentials between Permian Basin index prices and southern California index prices.

Diesel derivatives. Periodically, the Company enters into diesel derivative swap contracts to mitigate fuel price risk. The diesel derivative swap contracts are priced at an index that is highly correlated to the prices that the Company incurs to fuel drilling rigs and its fracture stimulation fleet equipment. As of June 30, 2017, the Company was party to diesel derivative swap contracts for 1,000 Bbls per day for the remainder of 2017 at an average per Bbl fixed price of $63.00. As of June 30, 2017, these positions had a liability fair value of $1 million. Subsequent to June 30, 2017, the Company terminated its diesel derivative swap contracts for August through December 2017 for cash proceeds of $321 thousand.

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PIONEER NATURAL RESOURCES COMPANY

Item 4.Controls and Procedures

Evaluation of disclosure controls and procedures. The Company's management, with the participation of its principal executive officer and principal financial officer, have evaluated, as required by Rule 13a-15(b) under the Securities Exchange Act of 1934 (the "Exchange Act"), the effectiveness of the Company's disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e)) as of the end of the period covered by this Report. Based on that evaluation, the principal executive officer and principal financial officer concluded that the Company's disclosure controls and procedures were effective, as of the end of the period covered by this Report, in ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, including that such information is accumulated and communicated to the Company's management, including the principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure.

Changes in internal control over financial reporting. There have been no changes in the Company's internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that occurred during the three months ended June 30, 2017 that have materially affected or are reasonably likely to materially affect the Company's internal control over financial reporting.

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PIONEER NATURAL RESOURCES COMPANY

PART II. OTHER INFORMATION

Item 1.Legal Proceedings

The Company is party to the legal proceeding described in Note J of Notes to Consolidated Financial Statements included in "Part I, Item 1. Financial Statements." The Company is also party to various proceedings and claims incidental to its business. While many of these matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to these proceedings and claims will not have a material adverse effect on the Company's consolidated financial position as a whole or on its liquidity, capital resources or future annual results of operations. 

Item 1A. Risk Factors

In addition to the information set forth in this Report, the risks that are discussed in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, under the headings "Part I, Item 1. Business – Competition, Markets and Regulations," "Part I, Item 1A. Risk Factors" and "Part II, Item 7A. Quantitative and Qualitative Disclosures About Market Risk," should be carefully considered as such risks could materially affect the Company's business, financial condition or future results. There has been no material change in the Company's risk factors from those described in the Annual Report on Form 10-K.

These risks are not the only risks facing the Company. Additional risks and uncertainties not currently known to the Company or that it currently deems to be immaterial also may have a material adverse effect on the Company's business, financial condition or future results.

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

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

The following table summarizes the Company's purchases of treasury stock under plans or programs during the three months ended June 30, 2017:

Period	Total Number of Shares Purchased (a)	Average Price Paid per Share		Total Number of Shares  Purchased As Part of Publicly Announced Plans or Programs	Approximate Dollar Amount of Shares that May Yet Be Purchased under Plans or Programs
April 2017	124	$	190.35	—
May 2017	135	$	165.08	—
June 2017	82	$	166.86	—
Total	341	$	174.70	—	$	—

 ____________________

(a) Consists of shares purchased from employees in order for the employee to satisfy tax withholding payments related to share-based awards that vested during the period.

Item 4.Mine Safety Disclosures

The Company's sand mines are subject to regulation by the Federal Mine Safety and Health Administration under the Federal Mine Safety and Health Act of 1977, as amended by the Mine Improvement and New Emergency Response Act of 2006. Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K is included in Exhibit 95.1 to this Report.

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PIONEER NATURAL RESOURCES COMPANY

Item 6.Exhibits

Exhibits

Exhibit Number		Description
10.1	(a) —	Form of Amendment to Severance Agreement and Change in Control Agreement dated May 17, 2017, between the Company and each executive officer of the Company.
12.1	(a) —	Computation of Ratios of Earnings to Fixed Charges and Earnings to Fixed Charges and Preferred Stock Dividends.
31.1	(a) —	Chief Executive Officer certification under Section 302 of Sarbanes-Oxley Act of 2002.
31.2	(a) —	Chief Financial Officer certification under Section 302 of Sarbanes-Oxley Act of 2002.
32.1	(b) —	Chief Executive Officer certification under Section 906 of Sarbanes-Oxley Act of 2002.
32.2	(b) —	Chief Financial Officer certification under Section 906 of Sarbanes-Oxley Act of 2002.
95.1	(a) —	Mine Safety Disclosures.
101.INS	(a) —	XBRL Instance Document.
101.SCH	(a) —	XBRL Taxonomy Extension Schema.
101.CAL	(a) —	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	(a) —	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	(a) —	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	(a) —	XBRL Taxonomy Extension Presentation Linkbase Document.

 _____________

(a) Filed herewith.

(b) Furnished herewith.

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PIONEER NATURAL RESOURCES COMPANY

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 hereto duly authorized.

	PIONEER NATURAL RESOURCES COMPANY
Date: August 1, 2017	By:	/s/    RICHARD P. DEALY
		Richard P. Dealy,
		Executive Vice President and Chief Financial Officer
Date: August 1, 2017	By:	/s/    MARGARET M. MONTEMAYOR
		Margaret M. Montemayor,
		Vice President and Chief Accounting Officer

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PIONEER NATURAL RESOURCES COMPANY

Exhibit Index

Exhibit Number		Description
10.1	(a) —	Form of Amendment to Severance Agreement and Change in Control Agreement dated May 17, 2017, between the Company and each executive officer of the Company.
12.1	(a) —	Computation of Ratios of Earnings to Fixed Charges and Earnings to Fixed Charges and Preferred Stock Dividends.
31.1	(a) —	Chief Executive Officer certification under Section 302 of Sarbanes-Oxley Act of 2002.
31.2	(a) —	Chief Financial Officer certification under Section 302 of Sarbanes-Oxley Act of 2002.
32.1	(b) —	Chief Executive Officer certification under Section 906 of Sarbanes-Oxley Act of 2002.
32.2	(b) —	Chief Financial Officer certification under Section 906 of Sarbanes-Oxley Act of 2002.
95.1	(a) —	Mine Safety Disclosures.
101.INS	(a) —	XBRL Instance Document.
101.SCH	(a) —	XBRL Taxonomy Extension Schema.
101.CAL	(a) —	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	(a) —	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	(a) —	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	(a) —	XBRL Taxonomy Extension Presentation Linkbase Document.

_____________ 

(a) Filed herewith.

(b) Furnished herewith.

41

EX-10.1

EXHIBIT 10.1

AMENDMENT TO

SEVERANCE AGREEMENT

AND

CHANGE IN CONTROL AGREEMENT

WHEREAS, Pioneer Natural Resources Company (the “Parent“), Pioneer Natural Resources USA, Inc. (the “Employer”) and the employee whose name appears on the signature page of this Amendment (the “Employee”) have previously entered into a Severance Agreement (the “Severance Agreement”) which provides the Employee with certain benefits in the event the Employee’s employment is terminated in certain circumstances prior to the occurrence of a change in control;

WHEREAS, the Parent and the Employee have previously entered into a Change in Control Agreement (the “Change in Control Agreement,” and, together with the Severance Agreement, the “Agreements”) which provides the Employee with certain benefits in the event the Employee’s employment is terminated in certain circumstances following the occurrence of a change in control;

WHEREAS, the parties desire to enter into this Amendment to clarify and, to the extent necessary, modify, the Agreements as provided herein;

NOW, THEREFORE, each of the Agreements is amended and modified to provide that nothing in the Agreements, or in any other agreement or arrangement between or among the Employee and the Parent and/or the Employer or any other subsidiary of the Parent, shall prevent or restrict in any way (i) the Employee from exercising any rights that cannot be lawfully waived or restricted, (ii) the Employee from testifying at a hearing, deposition, or in court in response to a lawful subpoena or (iii) the Employee’s ability to file a charge or complaint with the Equal Employment Opportunity Commission, the Occupational Safety and Health Administration, the Securities and Exchange Commission, the United States Department of Justice, Congress, any agency Inspector General or any other federal, state or local governmental agency or commission (“Government Agencies”). Further, neither Agreement, nor any other agreement between or among the Employee and the Parent and/or the Employer or any other subsidiary of the Parent, shall prevent or restrict in any way (i) the Employee’s ability to communicate with any Government Agencies or otherwise participate in any investigation or proceeding that may be conducted by any Government Agency, including providing documents or other information, without notice to the Parent or the Employer, or (ii) the right of the Employee to receive an award from a Government Agency for information provided to any Government Agencies.

IN WITNESS WHEREOF, the parties hereunder have caused this Amendment to be executed as of May 17, 2017.

PIONEER NATURAL RESOURCES COMPANY
By:	/s/ Teresa A. Fairbrook
	Name: Teresa A. Fairbrook
	Title: Vice President and Chief Human Resources Officer
PIONEER NATURAL RESOURCES USA, INC.
By:	/s/ Teresa A. Fairbrook
	Name: Teresa A. Fairbrook
	Title: Vice President and Chief Human Resources Officer
EMPLOYEE
Name:

EX-12.1

EXHIBIT 12.1

RATIOS OF EARNINGS TO FIXED CHARGES AND EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

The following table sets forth the Company's ratios of consolidated earnings to fixed charges and earnings to fixed charges and preferred stock dividends for the periods presented:

	Six Months Ended	Year ended December 31,
	June 30, 2017	2016	2015	2014	2013	2012
Ratio of earnings to fixed charges (a)	4.26	(b)	(c)	9.45	(d)	4.52
Ratio of earnings to fixed charges and preferred stock dividends (e)	4.26	(b)	(c)	9.45	(d)	4.52

____________________

(a)	The ratio has been computed by dividing earnings by fixed charges. For purposes of computing the ratio:
	- earnings consist of income from continuing operations before income taxes, cumulative effect of change in accounting principle, adjustments for net income or loss attributable to the noncontrolling interest and the Company's share of investee's income or loss accounted for under the equity method, and adjustment for capitalized interest, plus fixed charges and the Company's share of distributed income from investees accounted for under the equity method; and
	- fixed charges consist of interest expense, capitalized interest and the portion of rental expense deemed to be representative of the interest component of rental expense.
(b)	The ratio indicates a less than one-to-one coverage because the earnings are inadequate to cover the fixed charges during the year ended December 31, 2016 by $963 million.
(c)	The ratio indicates a less than one-to-one coverage because the earnings are inadequate to cover the fixed charges during the year ended December 31, 2015 by $432 million.
(d)	The ratio indicates a less than one-to-one coverage because the earnings are inadequate to cover the fixed charges during the year ended December 31, 2013 by $606 million.
(e)	The ratio has been computed by dividing earnings by fixed charges and preferred stock dividends. For purposes of computing the ratio:
	- earnings consist of income from continuing operations before income taxes, cumulative effect of change in accounting principle, adjustments for net income or loss attributable to the noncontrolling interest and the Company's share of investee's income or loss accounted for under the equity method, and adjustment for capitalized interest, plus fixed charges, the Company's share of distributed income from investees accounted for under the equity method and preferred stock dividends, net of preferred stock dividends of a consolidated subsidiary; and
	- fixed charges and preferred stock dividends consist of interest expense, capitalized interest and the portion of rental expense deemed to be representative of the interest component of rental expense, preferred stock dividends of a consolidated subsidiary and preferred stock dividends.

EX-31.1

EXHIBIT 31.1

CHIEF EXECUTIVE OFFICER CERTIFICATION

I, Timothy L. Dove, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Pioneer Natural Resources Company;

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 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 (or persons performing the equivalent functions):

(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: August 1, 2017

/s/ Timothy L. Dove

Timothy L. Dove, President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CHIEF FINANCIAL OFFICER CERTIFICATION

I, Richard P. Dealy, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Pioneer Natural Resources Company;

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 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 (or persons performing the equivalent functions):

(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: August 1, 2017

/s/ Richard P. Dealy

Richard P. Dealy, Executive Vice President

and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF

CHIEF EXECUTIVE OFFICER

OF PIONEER NATURAL RESOURCES COMPANY

PURSUANT TO 18 U.S.C. § 1350

I, Timothy L. Dove, President and Chief Executive Officer of Pioneer Natural Resources Company (the “Company”), hereby certify that the accompanying Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2017 and filed with the Securities and Exchange Commission pursuant to Section 13(a) of the Securities Exchange Act of 1934 (the “Report”) by the Company fully complies with the requirements of that section.

I further certify that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Timothy L. Dove
Name:	Timothy L. Dove, President and
	Chief Executive Officer
Date:	Date: August 1, 2017

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF

CHIEF FINANCIAL OFFICER

OF PIONEER NATURAL RESOURCES COMPANY

PURSUANT TO 18 U.S.C. § 1350

I, Richard P. Dealy, Executive Vice President and Chief Financial Officer of Pioneer Natural Resources Company (the “Company”), hereby certify that the accompanying Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2017 and filed with the Securities and Exchange Commission pursuant to Section 13(a) of the Securities Exchange Act of 1934 (the “Report”) by the Company fully complies with the requirements of that section.

I further certify that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Richard P. Dealy
Name:	Richard P. Dealy, Executive Vice
	President and Chief Financial Officer
Date:	Date: August 1, 2017

EX-95.1

EXHIBIT 95.1

Mine Safety Disclosure

The following disclosures are provided pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Act") and Item 104 of Regulation S-K, which requires certain disclosures by companies required to file periodic reports under the Securities Exchange Act of 1934, as amended, that operate mines regulated under the Federal Mine Safety and Health Act of 1977 (the "Mine Act").

Whenever the Federal Mine Safety and Health Administration ("MSHA") believes a violation of the Mine Act, any health or safety standard or any regulation has occurred, it may issue a citation which describes the alleged violation and fixes a time within which the U.S. mining operator must abate the alleged violation. In some situations, such as when MSHA believes that conditions pose a hazard to miners, MSHA may issue an order removing miners from the area of the mine affected by the condition until the alleged hazards are corrected. When MSHA issues a citation or order, it generally proposes a civil penalty, or fine, as a result of the alleged violation, that the operator is ordered to pay. Citations and orders can be contested and appealed, and as part of that process, are often reduced in severity and amount, and are sometimes dismissed. The number of citations, orders and proposed assessments vary depending on the size and type (underground or surface) of the mine as well as by the MSHA inspector(s) assigned.

The table below sets forth for the three months ended June 30, 2017 for each sand mine of Pioneer Natural Resources Company or its subsidiaries (the "Company"), (i) the total number of citations for violations of mandatory health or safety standards that could significantly and substantially contribute to the cause and effect of mine safety or health hazard under section 104 of the Mine Act for which the operator received a citation from MSHA; (ii) the total number of orders issued under section 104(b) of the Mine Act; (iii) the total number of citations and orders for unwarrantable failure of the mine operator to comply with mandatory health or safety standards under section 104(d) of the Mine Act; (iv) the total number of flagrant violations under section 110(b)(2) of the Mine Act; (v) the total number of imminent danger orders issued under section 107(a) of the Mine Act; (vi) the total dollar value of proposed assessments from MSHA; (vii) the total number of mining-related fatalities; (viii) whether or not the mine has received any notices from MSHA of a pattern of violations of mandatory health or safety standards that are of such nature as could have significantly and substantially contributed to the cause and effect of mine health or safety hazards under section 104(e) of the Mine Act; (ix) whether or not the mine has received any notices from MSHA regarding the potential to have a pattern of violations as referenced in (viii) above; and (x) the total number of pending legal actions before the Federal Mine Safety and Health Review Commission (the "Commission") (as of June 30, 2017) involving such mine, as well as the aggregate number of legal actions instituted and the aggregate number of legal actions resolved during the reporting period. The MSHA citations, orders and assessments are those initially issued or proposed by MSHA. They do not reflect any subsequent changes in the level of severity of a citation or order or the value of an assessment that may occur as a result of proceedings conducted in accordance with MSHA rules.

Mine/MSHA Identification Number(1)	Section  104 S&S Citations	Section 104(b) Orders	Section 104(d) Citations and  Orders	Section 110(b)(2) Violations	Section 107(a) Orders	Total Dollar Value of Proposed Assessments		Mining Related Fatalities	Received Notice of Pattern of Violations under Section 104(e) (yes/no)	Received Notice of Potential to have Pattern under Section 104(e) (yes/no)	Legal Actions Pending as of Last Day of Period	Legal Actions Initiated During Period	Legal Actions Resolved During Period
Colorado Springs Operation / 0503295	—	—	—	—	—	$	—	—	No	No	—	—	—
Millwood Operation / 3301355	—	—	—	—	—	$	—	—	No	No	—	—	—
Voca Pit and Plant / 4101003	—	—	—	—	—	$	—	—	No	No	—	—	—
Brady Plant / 4101371	—	—	—	—	—	$	—	—	No	No	—	—	—
Voca West / 4103618	4	—	—	—	—	$	508	—	No	No	—	—	—

_______________

(1 ) The definition of mine under section three of the Mine Act includes the mine, as well as other items used in, or to be used in, or resulting from, the work of extracting minerals, such as land, structures, facilities, equipment, machines, tools and minerals preparation facilities. Unless otherwise indicated, any of these other items associated with a single mine have been aggregated in the totals for that mine. MSHA assigns an identification number to each mine and may or may not assign separate identification numbers to related facilities such as preparation facilities.

XML

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 28, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Trading Symbol	PXD
Entity Registrant Name	PIONEER NATURAL RESOURCES CO
Entity Central Index Key	0001038357
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		170,097,565

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents, at Carrying Value	$ 660	$ 1,118
Short-term Investments	1,539	1,441
Accounts receivable:
Trade, net	491	517
Due from affiliates	0	1
Income taxes receivable	1	3
Inventories	192	181
Other current assets:
Derivatives Assets, Current	156	14
Other	25	23
Total current assets	3,064	3,298
Oil and gas properties, using the successful efforts method of accounting:
Proved properties	18,983	18,566
Unproved properties	518	486
Accumulated depletion, depreciation and amortization	(8,505)	(8,211)
Total property, plant and equipment	10,996	10,841
Long-term Investments	187	420
Goodwill	270	272
Property, Plant and Equipment, Net	1,622	1,529
Other assets:
Derivative Assets, Noncurrent	29	0
Other, net	103	99
Assets, Total	16,271	16,459
Accounts payable:
Trade	881	741
Due to affiliates	63	134
Interest payable	59	68
Current portion of long-term debt	449	485
Other current liabilities:
Derivative Liabilities, Current	3	77
Other	103	61
Total current liabilities	1,558	1,566
Long-term Debt, Excluding Current Maturities	2,281	2,728
Derivative Liabilities, Noncurrent	1	7
Deferred income taxes	1,487	1,397
Other liabilities	342	350
Stockholders' equity:
Common stock, $.01 par value	2	2
Additional paid-in capital	8,937	8,892
Treasury stock at cost	(254)	(218)
Retained earnings	1,912	1,728
Total equity attributable to common stockholders	10,597	10,404
Noncontrolling interests in consolidating subsidiaries	5	7
Total equity	10,602	10,411
Commitments and contingencies
Liabilities and Equity, Total	$ 16,271	$ 16,459

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	173,782,802	173,221,845
Treasury Stock, Shares	3,685,802	3,497,742

XML

Consolidated Statements Of Operations - USD ($) $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues and other income:
Oil and gas	$ 768,000	$ 613,000	$ 1,577,000	$ 1,022,000
Sales of purchased oil and gas	517,000	395,000	1,001,000	618,000
Interest and other	16,000	6,000	30,000	13,000
Derivative gains, net	135,000	(229,000)	286,000	(186,000)
Gain (loss) on disposition of assets, net	194,000	1,000	205,000	3,000
Total revenues and other income	1,630,000	786,000	3,099,000	1,470,000
Costs and expenses:
Oil and gas production	147,000	141,000	288,000	297,000
Production and ad valorem taxes	51,000	36,000	99,000	65,000
Depletion, depreciation and amortization	341,000	384,000	678,000	737,000
Purchased oil and gas	531,000	410,000	1,034,000	653,000
Impairment of oil and gas properties	0	0	285,000	32,000
Exploration and abandonments	26,000	18,000	59,000	77,000
General and administrative	81,000	80,000	165,000	154,000
Accretion of discount on asset retirement obligations	5,000	5,000	10,000	9,000
Interest	35,000	56,000	81,000	111,000
Other	59,000	67,000	119,000	154,000
Costs and Expenses	1,276,000	1,197,000	2,818,000	2,289,000
Income (loss) from continuing operations before income taxes	354,000	(411,000)	281,000	(819,000)
Income tax provision	$ (121,000)	143,000	$ (90,000)	284,000
Net income (loss) attributable to common stockholders		$ (268,000)		$ (535,000)
Basic earnings per share:
Basic and diluted net loss per share attributable to common stockholders	$ 1.36	$ (1.63)	$ 1.11	$ (3.28)
Weighted average shares outstanding:
Basic weighted average shares outstanding	170	164	170	163
Diluted	170	164	170	163
Dividends declared per share	$ 0.00	$ 0.00	$ 0.04	$ 0.04
Retained Earnings [Member]
Costs and expenses:
Net income (loss) attributable to common stockholders	$ 233,000		$ 191,000

XML

Consolidated Statement Of Equity - 6 months ended Jun. 30, 2017 - USD ($) shares in Thousands, $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]
Beginning Balance, shares at Dec. 31, 2016		169,724
Beginning Balance at Dec. 31, 2016	$ 10,411	$ 2	$ 8,892	$ (218)	$ 1,728	$ 7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared ($0.04 per share)	(7)				(7)
Treasury stock purchases, shares		(188)
Treasury stock purchases	(36)			(36)
Compensation costs:
Vested compensation awards, shares		561
Vested compensation awards	0	$ 0	0
Compensation costs included in net income	43		43			0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	0		2			(2)
Net Income (Loss) Attributable to Parent					191
Net loss	191					0
Ending Balance, shares at Jun. 30, 2017		170,097
Ending Balance at Jun. 30, 2017	$ 10,602	$ 2	$ 8,937	$ (254)	$ 1,912	$ 5

XML

Consolidated Statement Of Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Dividends declared per share	$ 0.00	$ 0.00	$ 0.04	$ 0.04

XML

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 191,000	$ (535,000)
Adjustments to reconcile net income to net cash provided by operating activities:
Depletion, depreciation and amortization	678,000	737,000
Impairment of oil and gas properties	285,000	32,000
Impairment of Inventory and Other Property and Equipment	1,000	5,000
Exploration expenses, including dry holes	18,000	40,000
Deferred income taxes	90,000	(284,000)
Gain on disposition of assets, net	(205,000)	(3,000)
Accretion of discount on asset retirement obligations	10,000	9,000
Interest expense	2,000	9,000
Derivative related activity	(251,000)	535,000
Amortization of stock-based compensation	43,000	44,000
Other	34,000	34,000
Change in operating assets and liabilities, net of effects from acquisitions and dispositions:
Accounts receivable, net	27,000	(51,000)
Income taxes receivable	2,000	39,000
Inventories	(11,000)	(12,000)
Derivatives	0	(12,000)
Increase Decrease in Investments	3,000	0
Other current assets	1,000	0
Accounts payable	(42,000)	(60,000)
Interest payable	(9,000)	20,000
Income taxes payable	0	(2,000)
Other current liabilities	(24,000)	(26,000)
Net cash provided by operating activities	843,000	519,000
Cash flows from investing activities:
Proceeds from disposition of assets, net of cash sold	345,000	2,000
Proceeds from Sale and Maturity of Held-to-maturity Securities	878,000	1,000
Purchase of investment securities	(746,000)	(1,495,000)
Additions to oil and gas properties	(1,074,000)	(971,000)
Additions to other assets and other property and equipment, net	(176,000)	(126,000)
Net cash used in investing activities	(773,000)	(2,589,000)
Cash flows from financing activities:
Principal payments on long-term debt	(485,000)	0
Proceeds from issuance of common stock, net of issuance costs	0	2,534,000
Purchases of treasury stock	(36,000)	(23,000)
Dividends paid	(7,000)	(7,000)
Net cash provided by (used in) financing activities	(528,000)	2,504,000
Net increase (decrease) in cash and cash equivalents	(458,000)	434,000
Cash and cash equivalents, beginning of period	1,118,000	1,391,000
Cash and cash equivalents, end of period	$ 660,000	$ 1,825,000

XML

Organization And Nature Of Operations

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization And Nature Of Operations

Organization and Nature of Operations

Pioneer Natural Resources Company ("Pioneer" or the "Company") is a Delaware corporation whose common stock is listed and traded on the New York Stock Exchange. The Company is a large independent oil and gas exploration and production company that explores for, develops and produces oil, natural gas liquids ("NGLs") and gas within the United States, with operations primarily in the Permian Basin in West Texas, the Eagle Ford Shale play in South Texas, the Raton field in southeast Colorado and the West Panhandle field in the Texas Panhandle.

XML

Basis Of Presentation

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis Of Presentation

Basis of Presentation

Presentation. In the opinion of management, the consolidated financial statements of the Company as of June 30, 2017 and for the three and six months ended June 30, 2017 and 2016 include all adjustments and accruals, consisting only of normal, recurring accrual adjustments, which are necessary for a fair presentation of the results for the interim periods. These interim results are not necessarily indicative of results for a full year.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States ("GAAP") have been condensed in or omitted from this report pursuant to the rules and regulations of the United States Securities and Exchange Commission (the "SEC"). These consolidated financial statements should be read together with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

Certain reclassifications have been made to the 2016 financial statement and footnote amounts in order to conform to the 2017 presentation.

Issuance of common stock. During the first and second quarters of 2016, the Company issued 13.8 million and 6.0 million shares of common stock, respectively, and received cash proceeds of $1.6 billion and $937 million, respectively, net of associated underwriter discounts and offering expenses.

New accounting pronouncements. In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, "Improvements to Employee Share-Based Payment Accounting." ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as certain classification changes in the statement of cash flows. The Company adopted this standard on January 1, 2017. See Note M for discussion on the impact of the adoption to the Company's income tax provision.

In February 2016, the FASB issued ASU 2016-02, "Leases." ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases currently classified as operating leases and makes certain changes to the way lease expenses are accounted for. This update is effective for fiscal years beginning after December 15, 2018 and for interim periods beginning the following year. This update should be applied using a modified retrospective approach, and early adoption is permitted. The Company anticipates that the adoption of ASU 2016-02 for its leasing arrangements will likely (i) increase the Company's recorded assets and liabilities, (ii) increase depreciation, depletion and amortization expense, (iii) increase interest expense and (iv) decrease lease/rental expense. The Company is currently evaluating each of its lease arrangements and has not determined the aggregate amount of change expected for each category.

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," which supersedes the revenue recognition requirements in Accounting Standards Codification ("ASC") Topic 605, "Revenue Recognition," and most industry-specific guidance. ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. In August 2015, the FASB issued ASU 2015-14, which defers the effective date of ASU 2014-09 for one year to fiscal years beginning after December 15, 2017. Early adoption is permitted for fiscal years beginning after December 15, 2016. In May 2016, the FASB issued ASU 2016-11, which rescinded guidance from the SEC on accounting for gas balancing arrangements and will eliminate the use of the entitlements method. Entities have the option of using either a full retrospective or modified approach to adopt these new standards. The Company plans to utilize the modified approach to adopt the new standards upon their effective dates. The Company is evaluating the new guidance, including identifying revenue streams and reviewing contracts and procedures currently in place. The Company does not anticipate this standard will have a material impact on its consolidated financial statements.

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Acquisitions and Divestitures

6 Months Ended

Jun. 30, 2017

Acquisitions and Divestitures [Abstract]

Acquisition and Divestitures

Acquisitions and Divestitures

Permian Basin Acquisition. In August 2016, the Company acquired approximately 28,000 net acres in the Permian Basin, with net production of approximately 1,400 barrels of oil equivalent per day ("BOEPD"), from an unaffiliated third party for $428 million, including normal closing adjustments. The acquisition was accounted for using the acquisition method under ASC 805, "Business Combinations," which requires acquired assets and liabilities to be recorded at fair value as of the acquisition date.

The following table represents the allocation of the acquisition price to the assets acquired and the liabilities assumed based on their fair value at the acquisition date (in millions):

Assets acquired:
Proved properties	$	79
Unproved properties	347
Other property and equipment	5
Liabilities assumed:
Asset retirement obligations	(2		)
Other liabilities	(1		)
Net assets acquired	$	428

The fair value measurements of the net assets acquired are based on inputs that are not observable in the market and, therefore, represent Level 3 inputs in the fair value hierarchy (see Note D for a description of the input levels in the fair value hierarchy). The Company calculated the fair values of the acquired proved properties and asset retirement obligations using a discounted future cash flow model that utilizes management's estimates of (i) proved reserves, (ii) forecasted production rates, (iii) future operating, development and plugging and abandonment costs, (iv) future commodity prices and (v) a discount rate of 10 percent for proved properties and seven percent for asset retirement obligations. The Company calculated the fair values of the acquired unproved properties based on the average price per acre in comparable market transactions. The operating results attributable to the acquired assets and liabilities assumed are included in the Company's accompanying consolidated statements of operations since the date of acquisition.

Divestitures. For the three and six months endedJune 30, 2017, the Company recorded net gains on the disposition of assets of $194 million and $205 million, respectively. For the three and six months ended June 30, 2016, the Company recorded net gains on the disposition of assets of $1 million and $3 million, respectively.

In April 2017, the Company completed the sale of approximately 20,500 acres in the Martin County region of the Permian Basin, with net production of approximately 1,500 BOEPD, to an unaffiliated third party for cash proceeds of $266 million, before normal closing adjustments. The sale resulted in a gain of $194 million. During the three months ended June 30, 2017, the Company reduced the carrying value of goodwill by $2 million, reflecting the portion of the Company's goodwill related to the assets sold.

During the six months ended June 30, 2017, the Company also completed the sales of other nonstrategic proved and unproved properties in the Permian Basin for cash proceeds of $77 million, which resulted in a gain of $10 million.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or the price paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are based upon inputs that market participants use in pricing an asset or liability, which are characterized according to a hierarchy that prioritizes those inputs based on the degree to which they are observable. Observable inputs represent market data obtained from independent sources, whereas unobservable inputs reflect a company's own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. The three input levels of the fair value hierarchy are as follows:

• Level 1 – quoted prices for identical assets or liabilities in active markets.

• Level 2 – quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates) and inputs derived principally from or corroborated by observable market data by correlation or other means.

• Level 3 – unobservable inputs for the asset or liability.

Assets and liabilities measured at fair value on a recurring basis. The fair value input hierarchy level to which an asset or liability measurement in its entirety falls is determined based on the lowest level input that is significant to the measurement in its entirety.

The following table presents the Company's assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016 for each of the fair value hierarchy levels:

	Fair Value Measurement as of June 30, 2017 Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value as of June 30, 2017
	(in millions)
Assets:
Commodity derivatives	$	—	$	180	$	—	$	180
Interest rate derivatives	—		5		—		5
Deferred compensation plan assets	87		—		—		87
Total assets	87		185		—		272
Liabilities:
Commodity derivatives	—		3		—		3
Diesel derivatives	—		1		—		1
Total liabilities	—		4		—		4
Total recurring fair value measurements	$	87	$	181	$	—	$	268

	Fair Value Measurement as of December 31, 2016 Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Fair value as of December 31, 2016
	(in millions)
Assets:
Commodity derivatives	$	—	$	8		$	—	$	8
Interest rate derivatives	—		6			—		6
Deferred compensation plan assets	83		—			—		83
Total assets	83		14			—		97
Liabilities:
Commodity derivatives	—		84			—		84
Total liabilities	—		84			—		84
Total recurring fair value measurements	$	83	$	(70	)	$	—	$	13

Commodity and diesel derivatives. The Company's commodity derivatives represent oil, NGL and gas swap contracts, collar contracts and collar contracts with short puts. The Company's diesel derivative liability represents swap contracts. The asset and liability measurements for these derivative contracts represent Level 2 inputs in the hierarchy. The Company utilizes discounted cash flow and option-pricing models for valuing its commodity and diesel derivatives.

The asset and liability values attributable to the Company's commodity and diesel derivatives were determined based on inputs that include (i) the contracted notional volumes, (ii) independent active market price quotes, (iii) the applicable estimated credit-adjusted risk-free rate yield curve and (iv) the implied rate of volatility inherent in the collar contracts and collar contracts with short puts, which is based on active and independent market-quoted volatility factors.

Deferred compensation plan assets. The Company's deferred compensation plan assets represent investments in equity and mutual fund securities that are actively traded on major exchanges. These investments are measured based on observable prices on major exchanges. As of June 30, 2017, the significant inputs to these asset values represented Level 1 independent active exchange market price inputs.

Interest rate derivatives. The Company's interest rate derivative assets represent interest rate swap contracts. The Company utilizes discounted cash flow models for valuing its interest rate derivatives. The derivative values attributable to the Company's interest rate derivative contracts are based on (i) the contracted notional amounts, (ii) forward active market-quoted London Interbank Offered Rates ("LIBOR") and (iii) the applicable credit-adjusted risk-free rate yield curve. The Company's interest rate derivative fair value measurements represent Level 2 inputs in the hierarchy.

Assets and liabilities measured at fair value on a nonrecurring basis. Certain assets and liabilities are measured at fair value on a nonrecurring basis. These assets and liabilities are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances. These assets and liabilities can include inventory, proved and unproved oil and gas properties and other long-lived assets or liabilities that are acquired or written down to fair value when they are impaired or held for sale. See Note C for information on the fair value of assets and liabilities acquired in the Permian Basin acquisition.

Proved oil and gas properties. As a result of the Company's proved property impairment assessments, the Company recognized noncash impairment charges to reduce the carrying values of (i) the Raton field during the three months ended March 31, 2017 and (ii) the West Panhandle field during the three months ended March 31, 2016 to their estimated fair values.

The Company calculated the fair values of the Raton and West Panhandle fields using a discounted future cash flow model. Significant Level 3 assumptions associated with the calculations included management's longer-term commodity price outlooks ("Management's Price Outlooks") and management's outlooks for (i) production, (ii) production costs, (iii) capital expenditures and (iv) estimated proved reserves and risk-adjusted probable reserves. Management's Price Outlooks are developed based on third-party longer-term commodity futures price outlooks as of each measurement date. The expected future net cash flows were discounted using an annual rate of 10 percent to determine fair value.

The following table presents the fair value and fair value adjustments (in millions) for the Company's 2017 and 2016 proved property impairments, as well as the average oil price per barrel ("Bbl") and gas price per British thermal unit ("MMBtu") utilized in the respective Management's Price Outlooks:

							Management's Price Outlooks
	Impairment Date	Fair Value		Fair Value Adjustment			Oil		Gas
Raton	March 2017	$	186	$	(285	)	$	53.65	$	3.00
West Panhandle	March 2016	$	33	$	(32	)	$	49.77	$	3.24

It is reasonably possible that the estimate of undiscounted future net cash flows attributable to these or other properties may change in the future resulting in the need to impair their carrying values. The primary factors that may affect estimates of future cash flows are (i) future adjustments, both positive and negative, to proved and risk-adjusted probable and possible oil and gas reserves, (ii) results of future drilling activities, (iii) Management's Price Outlooks and (iv) increases or decreases in production and capital costs associated with these reserves.

Unproved oil and gas properties. During March 2016, the Company recorded an impairment charge of $32 million to write-off the carrying value of its unproved royalty acreage in Alaska (reported in exploration and abandonments in the accompanying consolidated statements of operations) as a result of the operator curtailing operations in the area and Management's Price Outlooks.

Financial instruments not carried at fair value. Carrying values and fair values of financial instruments that are not carried at fair value in the accompanying consolidated balance sheets as of June 30, 2017 and December 31, 2016 are as follows:

	June 30, 2017				December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Commercial paper, corporate bonds and time deposits	$	1,726	$	1,723	$	1,906	$	1,901
Current portion of long-term debt	$	449	$	468	$	485	$	490
Long-term debt	$	2,281	$	2,490	$	2,728	$	2,956

Commercial paper, corporate bonds and time deposits. Periodically, the Company invests in commercial paper and corporate bonds with investment grade rated entities. The Company also periodically enters into time deposits with financial institutions. The investments are carried at amortized cost and classified as held-to-maturity as the Company has the intent and ability to hold them until they mature. The carrying values of held-to-maturity investments are adjusted for amortization of premiums and accretion of discounts over the remaining life of the investment. Income related to these investments is recorded in interest and other income in the Company's consolidated statements of operations. The Company's investments in corporate bonds represent Level 1 inputs in the hierarchy, while other investments represent Level 2 inputs in the hierarchy. Commercial paper and time deposits are included in cash and cash equivalents if they have maturity dates that are less than 90 days at the date of purchase; otherwise, investments are reflected in short-term investments or long-term investments in the accompanying consolidated balance sheets based on their maturity dates. The following table provides the components of the Company's cash and cash equivalents and investments as of June 30, 2017 and December 31, 2016:

	June 30, 2017
Consolidated Balance Sheet Location	Cash		Commercial Paper		Corporate Bonds		Time Deposits		Total
	(in millions)
Cash and cash equivalents	$	560	$	—	$	—	$	100	$	660
Short-term investments	—		138		865		536		1,539
Long-term investments	—		—		187		—		187
	$	560	$	138	$	1,052	$	636	$	2,386

	December 31, 2016
Consolidated Balance Sheet Location	Cash		Commercial Paper		Corporate Bonds		Time Deposits		Total
	(in millions)
Cash and cash equivalents	$	873	$	45	$	—	$	200	$	1,118
Short-term investments	—		368		691		382		1,441
Long-term investments	—		—		420		—		420
	$	873	$	413	$	1,111	$	582	$	2,979

Debt obligations. The Company's debt obligations are composed of its credit facility and senior notes. The fair value of the Company's debt obligations is determined utilizing inputs that are Level 2 measurements in the fair value hierarchy. The fair value of the Company's credit facility is calculated using a discounted cash flow model based on (i) forecasted contractual interest and fee payments, (ii) forward active market-quoted United States Treasury Bill rates and (iii) the applicable credit-adjustments. The Company's senior notes represent debt securities that are not actively traded on major exchanges. The fair values of the Company's senior notes are based on their periodic values as quoted on the major exchanges.

The Company has other financial instruments consisting primarily of receivables, payables and other current assets and liabilities that approximate fair value due to the nature of the instrument and their relatively short maturities. Non-financial assets and liabilities initially measured at fair value include assets acquired and liabilities assumed in a business combination, goodwill and asset retirement obligations.

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Derivative Financial Instruments

6 Months Ended

Jun. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments

The Company utilizes commodity swap contracts, collar contracts and collar contracts with short puts to (i) reduce the effect of price volatility on the commodities the Company produces and sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. The Company also, from time to time, utilizes interest rate contracts to reduce the effect of interest rate volatility on the Company's indebtedness.

Periodically, the Company may pay a premium to enter into commodity contracts. Premiums paid, if any, have been nominal in relation to the value of the underlying asset in the contract. The Company recognizes the nominal premium payments as an increase to the value of derivative assets when paid. All derivatives are adjusted to fair value as of each balance sheet date.

Oil production derivative activities. All material physical sales contracts governing the Company's oil production are tied directly to, or are highly correlated with, New York Mercantile Exchange ("NYMEX") West Texas Intermediate ("WTI") oil prices. The Company uses derivative contracts to manage oil price volatility and basis swap contracts to reduce basis risk between NYMEX prices and the actual index prices at which the oil is sold.

The following table sets forth the volumes per day associated with the Company's outstanding oil derivative contracts as of June 30, 2017 and the weighted average oil prices for those contracts:

	2017				Year Ending December 31, 2018
	Third Quarter		Fourth Quarter
Collar contracts:
Volume (Bbl)	6,000		6,000		—
Price per Bbl:
Ceiling	$	70.40	$	70.40	$	—
Floor	$	50.00	$	50.00	$	—
Collar contracts with short puts (a):
Volume (Bbl)	147,000		155,000		71,000
Price per Bbl:
Ceiling	$	62.03	$	62.12	$	60.38
Floor	$	49.81	$	49.82	$	50.07
Short put	$	41.07	$	41.02	$	40.00

 ____________________

(a) Subsequent to June 30, 2017, the Company entered into additional oil collar contracts with short puts for 26,000 Bbl per day of 2018 production with a ceiling price of $55.01 per Bbl, a floor price of $45.00 per Bbl and a short put price of $35.00 per Bbl.

NGL production derivative activities. All material physical sales contracts governing the Company's NGL production are tied directly or indirectly to either Mont Belvieu, Texas or Conway, Kansas NGL component product prices. The Company uses derivative contracts to manage NGL component price volatility.

The following table sets forth the volumes per day associated with the Company's outstanding NGL derivative contracts as of June 30, 2017 and the weighted average NGL prices for those contracts:

	2017				Year Ending December 31,
	Third Quarter		Fourth Quarter		2018		2019
Butane collar contracts with short puts (a):
Volume (Bbl)	2,000		—		—		—
Price per Bbl:
Ceiling	$	36.12	$	—	$	—	$	—
Floor	$	29.25	$	—	$	—	$	—
Short put	$	23.40	$	—	$	—	$	—
Ethane collar contracts (b):
Volume (Bbl)	3,000		3,000		—		—
Price per Bbl:
Ceiling	$	11.83	$	11.83	$	—	$	—
Floor	$	8.68	$	8.68	$	—	$	—
Ethane basis swap contracts (c):
Volume (MMBtu)	6,920		6,920		6,920		6,920
Price differential ($/MMBtu)	$	1.60	$	1.60	$	1.60	$	1.60

 ____________________

(a) Represent collar contracts with short puts that reduce the price volatility of butane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(b) Represent collar contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(c) Represent basis swap contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices. The basis swap contracts fix the basis differential on a NYMEX Henry Hub ("HH") MMBtu equivalent basis. The Company will receive the HH price plus the price differential on 6,920 MMBtu per day, which is equivalent to 2,500 Bbls per day of ethane.

Gas production derivative activities. All material physical sales contracts governing the Company's gas production are tied directly or indirectly to HH gas prices or regional index prices where the gas is sold. The Company uses derivative contracts to manage gas price volatility and basis swap contracts to reduce basis risk between HH prices and actual index prices at which the gas is sold.

The following table sets forth the volumes per day associated with the Company's outstanding gas derivative contracts as of June 30, 2017 and the weighted average gas prices for those contracts:

	2017						Year Ending December 31, 2018
	Third Quarter			Fourth Quarter
Collar contracts with short puts:
Volume (MMBtu)	290,000			300,000			62,329
Price per MMBtu:
Ceiling	$	3.57		$	3.60		$	3.56
Floor	$	2.95		$	2.96		$	2.91
Short put	$	2.47		$	2.47		$	2.37
Basis swap contracts:
Mid-Continent index swap volume (MMBtu) (a)	45,000			45,000			—
Price differential ($/MMBtu)	$	(0.32	)	$	(0.32	)	$	—
Permian Basin index swap volume (MMBtu) (b)	—			26,522			39,945
Price differential ($/MMBtu)	$	—		$	0.30		$	0.30

____________________

(a) Represent swap contracts that fix the basis differentials between the index price at which the Company sells its Mid-Continent gas and the HH index price used in collar contracts with short puts.

(b) Represent swap contracts that fix the basis differentials between Permian Basin index prices and southern California index prices for Permian Basin gas forecasted for sale in southern California. Subsequent to June 30, 2017, the Company entered into additional basis swap contracts for 6,739 MMBtu per day of third quarter 2017 production with a price of $0.26 per MMBtu and 11,726 MMBtu per day of 2018 production with a price differential of $0.31 per MMBtu.

Diesel derivative activities. Periodically, the Company enters into diesel derivative swap contracts to mitigate fuel price risk. The diesel derivative swap contracts are priced at an index that is highly correlated to the prices that the Company incurs to fuel drilling rigs and its fracture stimulation fleet equipment. As of June 30, 2017, the Company was party to diesel derivative swap contracts for 1,000 Bbls per day for the remainder of 2017 at an average per Bbl fixed price of $63.00. Subsequent to June 30, 2017, the Company terminated its diesel derivative swap contracts for August through December 2017 for cash proceeds of $321 thousand.

Interest rate derivative activities. As of June 30, 2017, the Company was party to interest rate derivative contracts whereby the Company will receive the three-month LIBOR rate for the 10-year period from December 2017 through December 2027 in exchange for paying a fixed interest rate of 1.81 percent on a notional amount of $100 million on December 15, 2017.

Tabular disclosure of derivative financial instruments. All of the Company's derivatives are accounted for as non-hedge derivatives as of June 30, 2017 and December 31, 2016, and therefore all changes in the fair values of its derivative contracts are recognized as gains or losses in the earnings of the periods in which they occur. The Company classifies the fair value amounts of derivative assets and liabilities as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. The Company enters into derivatives under master netting arrangements, which, in an event of default, allows the Company to offset payables to and receivables from the defaulting counterparty.

The aggregate fair value of the Company's derivative instruments reported in the accompanying consolidated balance sheets by type and counterparty, including the classification between current and noncurrent assets and liabilities, consists of the following:

Fair Value of Derivative Instruments as of June 30, 2017
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in millions)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	153	$	(2	)	$	151
Interest rate derivatives	Derivatives - current	$	5	$	—		5
Commodity price derivatives	Derivatives - noncurrent	$	30	$	(1	)	29
							$	185
Liability Derivatives:
Commodity and diesel price derivatives	Derivatives - current	$	5	$	(2	)	$	3
Commodity price derivatives	Derivatives - noncurrent	$	2	$	(1	)	1
							$	4

Fair Value of Derivative Instruments as of December 31, 2016
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in millions)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	33	$	(25	)	$	8
Interest rate derivatives	Derivatives - current	$	6	$	—		6
							$	14
Liability Derivatives:
Commodity price derivatives	Derivatives - current	$	102	$	(25	)	$	77
Commodity price derivatives	Derivatives - noncurrent	$	7	$	—		7
							$	84

The Company uses credit and other financial criteria to evaluate the credit standing of, and to select, counterparties to its derivative instruments. Although the Company does not obtain collateral or otherwise secure the fair value of its derivative instruments, associated credit risk is mitigated by the Company's credit risk policies and procedures.

The following table details the location of gains and losses recognized on the Company's derivative contracts in the accompanying consolidated statements of operations:

Derivatives Not Designated as	Location of Gain / (Loss) Recognized in	Three Months Ended June 30,						Six Months Ended June 30,
Hedging Instruments	Earnings on Derivatives	2017			2016			2017			2016
		(in millions)
Commodity price derivatives	Derivative gains (losses), net	$	136		$	(222	)	$	287		$	(177	)
Interest rate derivatives	Derivative gains (losses), net	(1		)	(7		)	(1		)	(9		)
Total		$	135		$	(229	)	$	286		$	(186	)

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Exploratory Costs

6 Months Ended

Jun. 30, 2017

Exploratory Cost Disclosure [Abstract]

Exploratory Costs

Exploratory Costs

The Company capitalizes exploratory well and project costs until a determination is made that the well or project has either found proved reserves, is impaired or is sold. The Company's capitalized exploratory well and project costs are presented in proved properties in the accompanying consolidated balance sheets. If the exploratory well or project is determined to be impaired, the impaired costs are charged to exploration and abandonments expense.

The following table reflects the Company's capitalized exploratory well and project activity during the three and six months ended June 30, 2017:

	Three Months Ended June 30, 2017			Six Months Ended June 30, 2017
	(in millions)
Beginning capitalized exploratory well costs	$	432		$	323
Additions to exploratory well costs pending the determination of proved reserves	489			895
Reclassification due to determination of proved reserves	(477		)	(765		)
Exploratory well costs charged to exploration and abandonment expense	(1		)	(10		)
Ending capitalized exploratory well costs	$	443		$	443

The following table provides an aging as of June 30, 2017 and December 31, 2016 of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date drilling was completed:

	June 30, 2017		December 31, 2016
	(in millions, except well counts)
Capitalized exploratory well costs that have been suspended:
One year or less	$	420	$	318
More than one year	23		5
	$	443	$	323
Number of wells or projects with exploratory well costs that have been suspended for a period greater than one year	12		3

The 12 wells that were suspended for a period greater than one year as of June 30, 2017 are in the Eagle Ford Shale area. The Company expects to complete five of these wells in 2017 and the remaining seven wells in 2018.

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Long-Term Debt

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Long-Term Debt

Long-term Debt

Credit facility. The Company's long-term debt consists of senior notes, a revolving corporate credit facility (the "Credit Facility") and the effects of issuance costs and discounts. The Credit Facility is maintained with a syndicate of financial institutions and has aggregate loan commitments of $1.5 billion that expire in August 2020. As of June 30, 2017, the Company had no outstanding borrowings under the Credit Facility and was in compliance with its debt covenants.

Senior notes. The Company's 6.65% senior notes (the "6.65% Senior Notes") matured and were repaid in March 2017. The Company funded the $485 million repayment of the 6.65% Senior Notes with cash on hand. The Company's 6.875% senior notes (the "6.875% Senior Notes"), with an outstanding debt principal balance of $450 million, will mature in May 2018. The 6.875% Senior Notes are classified as current in the accompanying consolidated balance sheets as of June 30, 2017.

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Incentive Plans

6 Months Ended

Jun. 30, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Incentive Plans

Incentive Plans

Stock-based compensation. For the three and six months ended June 30, 2017, the Company recorded $27 million and $57 million, respectively, of stock-based compensation expense for all plans, as compared to $29 million and $53 million for the same respective periods in 2016. As of June 30, 2017, there was $137 million of unrecognized stock-based compensation expense related to unvested share-based compensation plans, including $31 million attributable to stock-based awards that are expected to be settled on their vesting date in cash, rather than in equity shares ("Liability Awards"). The unrecognized compensation expense will be recognized on a straight-line basis over the remaining vesting periods of the awards, which is a period of less than three years on a weighted average basis. As of June 30, 2017 and December 31, 2016, accounts payable – due to affiliates included $10 million and $22 million, respectively, of liabilities attributable to Liability Awards.

The following table summarizes the activity that occurred during the six months ended June 30, 2017 for each type of share-based incentive award issued by Pioneer:

	Restricted Stock Equity Awards		Restricted Stock Liability Awards		Performance Units	Stock Options
Outstanding as of December 31, 2016	1,077,227		290,552		178,556	159,378
Awards granted	320,103		108,911		59,044	—
Awards forfeited	(13,527	)	(5,012	)	—	—
Awards vested	(437,845	)	(129,499	)	—	—
Outstanding as of June 30, 2017	945,958		264,952		237,600	159,378

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Asset Retirement Obligations

6 Months Ended

Jun. 30, 2017

Asset Retirement Obligation [Abstract]

Asset Retirement Obligations

Asset Retirement Obligations

The Company's asset retirement obligations primarily relate to the future plugging and abandonment of wells and related facilities. The following table summarizes the Company's asset retirement obligation activity during the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in millions)
Beginning asset retirement obligations	$	297		$	285		$	297		$	285
New wells placed on production	1			—			1			—
Changes in estimates	7			—			7			—
Dispositions	(7		)	—			(7		)	—
Liabilities settled	(9		)	(9		)	(14		)	(13		)
Accretion of discount	5			5			10			9
Ending asset retirement obligations	$	294		$	281		$	294		$	281

The Company records the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities, respectively, in the accompanying consolidated balance sheets. As of June 30, 2017 and December 31, 2016, the current portion of the Company's asset retirement obligations was $46 million and $39 million, respectively.

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Commitments And Contingencies

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

Commitments and Contingencies

In addition to the legal action described below, the Company is a party to other proceedings and claims incidental to its business. While many of these matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to such proceedings and claims will not have a material adverse effect on the Company's financial position as a whole or on its liquidity, capital resources or future annual results of operations. The Company records reserves for contingencies when information available indicates that a loss is probable and the amount of the loss can be reasonably estimated.

U.S. Environmental Protection Agency ("EPA") potential enforcement action.The Company has been advised by the EPA that the agency is considering an enforcement action against the Company and may seek monetary sanctions for alleged failures to prevent emissions occurring at the Company's Fain gas plant in the West Panhandle region of Texas on five separate occasions. The Company has asserted defenses to the EPA's allegations and is in discussions with the EPA regarding these matters. Although the Company cannot predict the outcome of these discussions with any certainty, the Company believes such monetary sanctions will not exceed $45,000 for any single event, but could exceed $100,000 in the aggregate.

Obligations following divestitures.In connection with its divestiture transactions, the Company may retain certain liabilities and provide the purchaser certain indemnifications, subject to defined limitations, which may apply to identified pre-closing matters, including matters of litigation, environmental contingencies, royalty obligations and income taxes. The Company does not believe these obligations are probable of having a material impact on its liquidity, financial position or future results of operations.

Lease agreements. In June 2017, the Company entered into a 20-year operating lease for the Company's new corporate headquarters in Irving, TX. Annual base rent will be $33 million and lease payments are expected to commence in the second half of 2019 when the building is complete.

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Interest And Other Income

6 Months Ended

Jun. 30, 2017

Interest and Other Income [Abstract]

Interest And Other Income

Interest and Other Income

The following table provides the components of the Company's interest and other income for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in millions)
Interest income	$	10	$	5	$	16	$	9
Severance and sales tax refunds	5		—		8		—
Deferred compensation plan income	1		—		3		2
Other income	—		1		3		2
Total interest and other income	$	16	$	6	$	30	$	13

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Other Expense

6 Months Ended

Jun. 30, 2017

Other Expense [Abstract]

Other Expense

Other Expense

The following table provides the components of the Company's other expense for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in millions)
Transportation commitment charges (a)	$	43	$	25	$	82	$	50
Loss from vertical integration services (b)	5		16		11		29
Idle drilling and well service equipment charges (c)	—		11		—		47
Other	11		15		26		28
Total other expense	$	59	$	67	$	119	$	154

 ____________________

(a) Primarily represents firm transportation payments on excess pipeline capacity commitments.

(b) Loss from vertical integration services primarily represents net margins (attributable to third party working interest owners) that result from Company-provided fracture stimulation and well service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three and six months ended June 30, 2017, these vertical integration net margins included $23 million and $42 million, respectively, of revenues and $28 million and $53 million, respectively, of costs and expenses. For the same respective periods in 2016, these vertical integration net margins included $56 million and $124 million of revenues and $72 million and $153 million of costs and expenses.

(c) Primarily represents expenses attributable to idle drilling rig fees that are not chargeable to joint operations and charges to terminate rig contracts that were not required to meet planned drilling activities.

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Income Taxes

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company's income tax benefit (provision) consisted of the following for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017		2016
	(in millions)
Deferred tax benefit (provision)	$	(121	)	$	143	(90	)	284

For the three and six months ended June 30, 2017, the Company's effective tax rate, excluding income attributable to noncontrolling interests, was 34 percent and 32 percent, respectively, as compared to an effective rate of 35 percent for both of the same respective periods in 2016. The Company's effective tax rate for the six months ended June 30, 2017 differs from the U.S. statutory rate of 35 percent primarily due to recognizing excess tax benefits of $8 million associated with the adoption of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," which requires excess tax benefits or deficiencies associated with the vesting of long-term incentive awards to be recorded as income tax expense or benefit in the statement of operations rather than as an adjustment to additional paid-in capital in the balance sheet.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based upon the technical merits of the position. As of June 30, 2017 and December 31, 2016, the Company had unrecognized tax benefits of $119 million and $112 million, respectively, resulting from research and experimental expenditures related to horizontal drilling and completions innovations. If all or a portion of the unrecognized tax benefit is sustained upon examination by the taxing authorities, the tax benefit will be recognized as a reduction to the Company's deferred tax liability and will affect the Company's effective tax rate in the period it is recognized. The Company expects to resolve the uncertainties associated with the unrecognized tax benefit by December 2018.

The Company files income tax returns in the U.S. federal and various state and foreign jurisdictions. The Internal Revenue Service has closed examinations of the 2012 and prior tax years and, with few exceptions, the Company believes that it is no longer subject to examinations by state and foreign tax authorities for years before 2011. As of June 30, 2017, no adjustments had been proposed in any jurisdiction that would have a significant effect on the Company's liquidity, future results of operations or financial position.

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Net Income Per Share

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Net Income Per Share

Net Income (Loss) Per Share

The following table reconciles the Company's net income (loss) attributable to common stockholders to basic and diluted net income (loss) attributable to common stockholders for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in millions)
Net income (loss) attributable to common stockholders	$	233		$	(268	)	$	191		$	(535	)
Participating share-based earnings	(2		)	—			(2		)	—
Basic and diluted net income (loss) attributable to common stockholders	$	231		$	(268	)	$	189		$	(535	)

Basic and diluted weighted average common shares outstanding were 170 million for the three and six months ended June 30, 2017, respectively, as compared to 164 million and 163 million for the same respective periods in 2016.

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Basis Of Presentation (Policies)

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Presentation

Presentation. In the opinion of management, the consolidated financial statements of the Company as of June 30, 2017 and for the three and six months ended June 30, 2017 and 2016 include all adjustments and accruals, consisting only of normal, recurring accrual adjustments, which are necessary for a fair presentation of the results for the interim periods. These interim results are not necessarily indicative of results for a full year.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States ("GAAP") have been condensed in or omitted from this report pursuant to the rules and regulations of the United States Securities and Exchange Commission (the "SEC"). These consolidated financial statements should be read together with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

Certain reclassifications have been made to the 2016 financial statement and footnote amounts in order to conform to the 2017 presentation.

New Accounting Pronouncements, Policy [Policy Text Block]

New accounting pronouncements. In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, "Improvements to Employee Share-Based Payment Accounting." ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as certain classification changes in the statement of cash flows. The Company adopted this standard on January 1, 2017. See Note M for discussion on the impact of the adoption to the Company's income tax provision.

In February 2016, the FASB issued ASU 2016-02, "Leases." ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases currently classified as operating leases and makes certain changes to the way lease expenses are accounted for. This update is effective for fiscal years beginning after December 15, 2018 and for interim periods beginning the following year. This update should be applied using a modified retrospective approach, and early adoption is permitted. The Company anticipates that the adoption of ASU 2016-02 for its leasing arrangements will likely (i) increase the Company's recorded assets and liabilities, (ii) increase depreciation, depletion and amortization expense, (iii) increase interest expense and (iv) decrease lease/rental expense. The Company is currently evaluating each of its lease arrangements and has not determined the aggregate amount of change expected for each category.

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," which supersedes the revenue recognition requirements in Accounting Standards Codification ("ASC") Topic 605, "Revenue Recognition," and most industry-specific guidance. ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. In August 2015, the FASB issued ASU 2015-14, which defers the effective date of ASU 2014-09 for one year to fiscal years beginning after December 15, 2017. Early adoption is permitted for fiscal years beginning after December 15, 2016. In May 2016, the FASB issued ASU 2016-11, which rescinded guidance from the SEC on accounting for gas balancing arrangements and will eliminate the use of the entitlements method. Entities have the option of using either a full retrospective or modified approach to adopt these new standards. The Company plans to utilize the modified approach to adopt the new standards upon their effective dates. The Company is evaluating the new guidance, including identifying revenue streams and reviewing contracts and procedures currently in place. The Company does not anticipate this standard will have a material impact on its consolidated financial statements.

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Acquisitions and Divestitures (Tables)

6 Months Ended

Jun. 30, 2017

Acquisitions and Divestitures [Abstract]

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The following table represents the allocation of the acquisition price to the assets acquired and the liabilities assumed based on their fair value at the acquisition date (in millions):

Assets acquired:
Proved properties	$	79
Unproved properties	347
Other property and equipment	5
Liabilities assumed:
Asset retirement obligations	(2		)
Other liabilities	(1		)
Net assets acquired	$	428

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The following table presents the Company's assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016 for each of the fair value hierarchy levels:

	Fair Value Measurement as of June 30, 2017 Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value as of June 30, 2017
	(in millions)
Assets:
Commodity derivatives	$	—	$	180	$	—	$	180
Interest rate derivatives	—		5		—		5
Deferred compensation plan assets	87		—		—		87
Total assets	87		185		—		272
Liabilities:
Commodity derivatives	—		3		—		3
Diesel derivatives	—		1		—		1
Total liabilities	—		4		—		4
Total recurring fair value measurements	$	87	$	181	$	—	$	268

	Fair Value Measurement as of December 31, 2016 Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Fair value as of December 31, 2016
	(in millions)
Assets:
Commodity derivatives	$	—	$	8		$	—	$	8
Interest rate derivatives	—		6			—		6
Deferred compensation plan assets	83		—			—		83
Total assets	83		14			—		97
Liabilities:
Commodity derivatives	—		84			—		84
Total liabilities	—		84			—		84
Total recurring fair value measurements	$	83	$	(70	)	$	—	$	13

Fair Value Measurements, Nonrecurring [Table Text Block]

The following table presents the fair value and fair value adjustments (in millions) for the Company's 2017 and 2016 proved property impairments, as well as the average oil price per barrel ("Bbl") and gas price per British thermal unit ("MMBtu") utilized in the respective Management's Price Outlooks:

							Management's Price Outlooks
	Impairment Date	Fair Value		Fair Value Adjustment			Oil		Gas
Raton	March 2017	$	186	$	(285	)	$	53.65	$	3.00
West Panhandle	March 2016	$	33	$	(32	)	$	49.77	$	3.24

Schedule of carrying values and financial instruments not carried at fair value

Carrying values and fair values of financial instruments that are not carried at fair value in the accompanying consolidated balance sheets as of June 30, 2017 and December 31, 2016 are as follows:

	June 30, 2017				December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Commercial paper, corporate bonds and time deposits	$	1,726	$	1,723	$	1,906	$	1,901
Current portion of long-term debt	$	449	$	468	$	485	$	490
Long-term debt	$	2,281	$	2,490	$	2,728	$	2,956

Cash, Cash Equivalents and Investments [Table Text Block]

The following table provides the components of the Company's cash and cash equivalents and investments as of June 30, 2017 and December 31, 2016:

	June 30, 2017
Consolidated Balance Sheet Location	Cash		Commercial Paper		Corporate Bonds		Time Deposits		Total
	(in millions)
Cash and cash equivalents	$	560	$	—	$	—	$	100	$	660
Short-term investments	—		138		865		536		1,539
Long-term investments	—		—		187		—		187
	$	560	$	138	$	1,052	$	636	$	2,386

	December 31, 2016
Consolidated Balance Sheet Location	Cash		Commercial Paper		Corporate Bonds		Time Deposits		Total
	(in millions)
Cash and cash equivalents	$	873	$	45	$	—	$	200	$	1,118
Short-term investments	—		368		691		382		1,441
Long-term investments	—		—		420		—		420
	$	873	$	413	$	1,111	$	582	$	2,979

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Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of oil derivative contracts volume and weighted average price

The following table sets forth the volumes per day associated with the Company's outstanding oil derivative contracts as of June 30, 2017 and the weighted average oil prices for those contracts:

	2017				Year Ending December 31, 2018
	Third Quarter		Fourth Quarter
Collar contracts:
Volume (Bbl)	6,000		6,000		—
Price per Bbl:
Ceiling	$	70.40	$	70.40	$	—
Floor	$	50.00	$	50.00	$	—
Collar contracts with short puts (a):
Volume (Bbl)	147,000		155,000		71,000
Price per Bbl:
Ceiling	$	62.03	$	62.12	$	60.38
Floor	$	49.81	$	49.82	$	50.07
Short put	$	41.07	$	41.02	$	40.00

 ____________________

(a) Subsequent to June 30, 2017, the Company entered into additional oil collar contracts with short puts for 26,000 Bbl per day of 2018 production with a ceiling price of $55.01 per Bbl, a floor price of $45.00 per Bbl and a short put price of $35.00 per Bbl.

Schedule of NGL derivative volumes and weighted average prices

The following table sets forth the volumes per day associated with the Company's outstanding NGL derivative contracts as of June 30, 2017 and the weighted average NGL prices for those contracts:

	2017				Year Ending December 31,
	Third Quarter		Fourth Quarter		2018		2019
Butane collar contracts with short puts (a):
Volume (Bbl)	2,000		—		—		—
Price per Bbl:
Ceiling	$	36.12	$	—	$	—	$	—
Floor	$	29.25	$	—	$	—	$	—
Short put	$	23.40	$	—	$	—	$	—
Ethane collar contracts (b):
Volume (Bbl)	3,000		3,000		—		—
Price per Bbl:
Ceiling	$	11.83	$	11.83	$	—	$	—
Floor	$	8.68	$	8.68	$	—	$	—
Ethane basis swap contracts (c):
Volume (MMBtu)	6,920		6,920		6,920		6,920
Price differential ($/MMBtu)	$	1.60	$	1.60	$	1.60	$	1.60

 ____________________

(a) Represent collar contracts with short puts that reduce the price volatility of butane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(b) Represent collar contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(c) Represent basis swap contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices. The basis swap contracts fix the basis differential on a NYMEX Henry Hub ("HH") MMBtu equivalent basis. The Company will receive the HH price plus the price differential on 6,920 MMBtu per day, which is equivalent to 2,500 Bbls per day of ethane.

Schedule of gas derivative volume and weighted average prices

The following table sets forth the volumes per day associated with the Company's outstanding gas derivative contracts as of June 30, 2017 and the weighted average gas prices for those contracts:

	2017						Year Ending December 31, 2018
	Third Quarter			Fourth Quarter
Collar contracts with short puts:
Volume (MMBtu)	290,000			300,000			62,329
Price per MMBtu:
Ceiling	$	3.57		$	3.60		$	3.56
Floor	$	2.95		$	2.96		$	2.91
Short put	$	2.47		$	2.47		$	2.37
Basis swap contracts:
Mid-Continent index swap volume (MMBtu) (a)	45,000			45,000			—
Price differential ($/MMBtu)	$	(0.32	)	$	(0.32	)	$	—
Permian Basin index swap volume (MMBtu) (b)	—			26,522			39,945
Price differential ($/MMBtu)	$	—		$	0.30		$	0.30

____________________

(a) Represent swap contracts that fix the basis differentials between the index price at which the Company sells its Mid-Continent gas and the HH index price used in collar contracts with short puts.

(b) Represent swap contracts that fix the basis differentials between Permian Basin index prices and southern California index prices for Permian Basin gas forecasted for sale in southern California.

Offsetting Asset and Liability

The aggregate fair value of the Company's derivative instruments reported in the accompanying consolidated balance sheets by type and counterparty, including the classification between current and noncurrent assets and liabilities, consists of the following:

Fair Value of Derivative Instruments as of June 30, 2017
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in millions)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	153	$	(2	)	$	151
Interest rate derivatives	Derivatives - current	$	5	$	—		5
Commodity price derivatives	Derivatives - noncurrent	$	30	$	(1	)	29
							$	185
Liability Derivatives:
Commodity and diesel price derivatives	Derivatives - current	$	5	$	(2	)	$	3
Commodity price derivatives	Derivatives - noncurrent	$	2	$	(1	)	1
							$	4

Schedule of derivative gains and losses recognized on statement of operations

The following table details the location of gains and losses recognized on the Company's derivative contracts in the accompanying consolidated statements of operations:

Derivatives Not Designated as	Location of Gain / (Loss) Recognized in	Three Months Ended June 30,						Six Months Ended June 30,
Hedging Instruments	Earnings on Derivatives	2017			2016			2017			2016
		(in millions)
Commodity price derivatives	Derivative gains (losses), net	$	136		$	(222	)	$	287		$	(177	)
Interest rate derivatives	Derivative gains (losses), net	(1		)	(7		)	(1		)	(9		)
Total		$	135		$	(229	)	$	286		$	(186	)

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Exploratory Costs (Tables)

6 Months Ended

Jun. 30, 2017

Exploratory Cost Disclosure [Abstract]

Capitalized exploratory well and project activity

The following table reflects the Company's capitalized exploratory well and project activity during the three and six months ended June 30, 2017:

	Three Months Ended June 30, 2017			Six Months Ended June 30, 2017
	(in millions)
Beginning capitalized exploratory well costs	$	432		$	323
Additions to exploratory well costs pending the determination of proved reserves	489			895
Reclassification due to determination of proved reserves	(477		)	(765		)
Exploratory well costs charged to exploration and abandonment expense	(1		)	(10		)
Ending capitalized exploratory well costs	$	443		$	443

Capitalized Exploratory Costs And The Number Of Projects For Which Exploratory Costs Have Been Capitalized

The following table provides an aging as of June 30, 2017 and December 31, 2016 of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date drilling was completed:

	June 30, 2017		December 31, 2016
	(in millions, except well counts)
Capitalized exploratory well costs that have been suspended:
One year or less	$	420	$	318
More than one year	23		5
	$	443	$	323
Number of wells or projects with exploratory well costs that have been suspended for a period greater than one year	12		3

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Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Share Based Incentive Award Activity

The following table summarizes the activity that occurred during the six months ended June 30, 2017 for each type of share-based incentive award issued by Pioneer:

	Restricted Stock Equity Awards		Restricted Stock Liability Awards		Performance Units	Stock Options
Outstanding as of December 31, 2016	1,077,227		290,552		178,556	159,378
Awards granted	320,103		108,911		59,044	—
Awards forfeited	(13,527	)	(5,012	)	—	—
Awards vested	(437,845	)	(129,499	)	—	—
Outstanding as of June 30, 2017	945,958		264,952		237,600	159,378

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Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2017

Asset Retirement Obligation [Abstract]

Schedule of asset retirement obligations

The following table summarizes the Company's asset retirement obligation activity during the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in millions)
Beginning asset retirement obligations	$	297		$	285		$	297		$	285
New wells placed on production	1			—			1			—
Changes in estimates	7			—			7			—
Dispositions	(7		)	—			(7		)	—
Liabilities settled	(9		)	(9		)	(14		)	(13		)
Accretion of discount	5			5			10			9
Ending asset retirement obligations	$	294		$	281		$	294		$	281

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Interest And Other Income (Tables)

6 Months Ended

Jun. 30, 2017

Interest and Other Income [Abstract]

Components of interest and other income

The following table provides the components of the Company's interest and other income for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in millions)
Interest income	$	10	$	5	$	16	$	9
Severance and sales tax refunds	5		—		8		—
Deferred compensation plan income	1		—		3		2
Other income	—		1		3		2
Total interest and other income	$	16	$	6	$	30	$	13

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Other Expense (Tables)

6 Months Ended

Jun. 30, 2017

Other Expense [Abstract]

Schedule of components of other expense

The following table provides the components of the Company's other expense for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in millions)
Transportation commitment charges (a)	$	43	$	25	$	82	$	50
Loss from vertical integration services (b)	5		16		11		29
Idle drilling and well service equipment charges (c)	—		11		—		47
Other	11		15		26		28
Total other expense	$	59	$	67	$	119	$	154

 ____________________

(a) Primarily represents firm transportation payments on excess pipeline capacity commitments.

(b) Loss from vertical integration services primarily represents net margins (attributable to third party working interest owners) that result from Company-provided fracture stimulation and well service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three and six months ended June 30, 2017, these vertical integration net margins included $23 million and $42 million, respectively, of revenues and $28 million and $53 million, respectively, of costs and expenses. For the same respective periods in 2016, these vertical integration net margins included $56 million and $124 million of revenues and $72 million and $153 million of costs and expenses.

(c) Primarily represents expenses attributable to idle drilling rig fees that are not chargeable to joint operations and charges to terminate rig contracts that were not required to meet planned drilling activities.

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Income tax (provisions) benefits attributable to income from continuing operations

The Company's income tax benefit (provision) consisted of the following for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017		2016
	(in millions)
Deferred tax benefit (provision)	$	(121	)	$	143	(90	)	284

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Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Reconciliation of earnings attributable to common stockholders, basic and diluted

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in millions)
Net income (loss) attributable to common stockholders	$	233		$	(268	)	$	191		$	(535	)
Participating share-based earnings	(2		)	—			(2		)	—
Basic and diluted net income (loss) attributable to common stockholders	$	231		$	(268	)	$	189		$	(535	)

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Basis Of Presentation Basis of Presentation (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Summary Of Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, New Issues	6.0	13.8
Proceeds from issuance of common stock, net of issuance costs	$ 937	$ 1,600	$ 0	$ 2,534

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Acquisitions and Divestitures Acquisitions and Divestitures (Business Combination) (Details) - Permian Basin [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) a Boe
Business Acquisition [Line Items]
Gas and Oil Area, Developed, Net | a	28,000
Production, Barrels of Oil Equivalents | Boe	1,400
Payments to Acquire Businesses, Net of Cash Acquired	$ 428
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	79
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	347
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings	5
AssetRetirementObligationLiabilitiesAcquiredInBusinessCombination	(2)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(1)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 428

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Acquisitions and Divestitures (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) a Boe	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) a	Jun. 30, 2016 USD ($)
Acquisitions and Divestitures [Line Items]
Gain (loss) on disposition of assets, net	$ 194	$ 1	$ 205	$ 3
Proceeds from Sale of Productive Assets			$ 345	$ 2
Martin County [Member]
Acquisitions and Divestitures [Line Items]
Gain (loss) on disposition of assets, net	194
Goodwill, Written off Related to Sale of Business Unit	2
Proceeds from Sale of Productive Assets	$ 266
Gas and Oil Area, Developed, Net | a	20,500		20,500
Production, Barrels of Oil Equivalents | Boe	1,500
Permian Basin [Member]
Acquisitions and Divestitures [Line Items]
Gain (loss) on disposition of assets, net			$ 10
Proceeds from Sale of Productive Assets			$ 77

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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	$ 87	$ 83
Assets, Fair Value Disclosure	272	97
Liabilities, Fair Value Disclosure	4	84
Recurring Measurements, (Fair Value, Total)	268	13
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	87	83
Assets, Fair Value Disclosure	87	83
Liabilities, Fair Value Disclosure	0	0
Recurring Measurements, (Fair Value, Total)	87	83
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	0	0
Assets, Fair Value Disclosure	185	14
Liabilities, Fair Value Disclosure	4	84
Recurring Measurements, (Fair Value, Total)	181	(70)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	0	0
Assets, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	0	0
Recurring Measurements, (Fair Value, Total)	0	0
Commodity Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Net	180	8
Derivative Liability, Fair Value, Net	3	84
Commodity Derivatives [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Net	0	0
Derivative Liability, Fair Value, Net	0	0
Commodity Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Net	180	8
Derivative Liability, Fair Value, Net	3	84
Commodity Derivatives [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Net	0	0
Derivative Liability, Fair Value, Net	0	0
Diesel [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Net	1
Diesel [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Net	0
Diesel [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Net	1
Diesel [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Net	0
Interest Rate Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Net	5	6
Interest Rate Derivatives [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Net	0	0
Interest Rate Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Net	5	6
Interest Rate Derivatives [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Net	$ 0	$ 0

XML

Fair Value Measurements Fair Value Measurements (Nonrecurring Fair Value Measurements) (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($) $ / MMBTU $ / bbl	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) $ / MMBTU $ / bbl	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of oil and gas properties	$ 0		$ 0		$ (285,000)	$ (32,000)
Management oil price outlook | $ / bbl		53.65		49.77
Management gas price outlook | $ / MMBTU		3.00		3.24
Impairment of Long-Lived Assets Held-for-use				$ 32,000
Raton Field [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Asset Group		$ 186,000
Impairment of oil and gas properties		$ (285,000)
West Panhandle [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Asset Group				33,000
Impairment of oil and gas properties				$ (32,000)

XML

Fair Value Measurements (Schedule Of Carrying Values And Financial Instruments Not Carried At Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of long-term debt	$ 449	$ 485
Long-term Debt, Excluding Current Maturities	2,281	2,728
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,726	1,906
Current portion of long-term debt	449	485
Long-term Debt, Excluding Current Maturities	2,281	2,728
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,723	1,901
Current portion of long-term debt	468	490
Long-term Debt, Excluding Current Maturities	$ 2,490	$ 2,956

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Fair Value Measurements Fair Value Measurements (Schedule of Cash and Cash Equivalents and Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents, at Carrying Value	$ 660	$ 1,118	$ 1,825	$ 1,391
Short-term Investments	1,539	1,441
Long-term Investments	187	420
Cash, Cash Equivalents, and Short-term Investments	2,386	2,979
Cash and Cash Equivalents [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents, at Carrying Value	560	873
Short-term Investments	0	0
Long-term Investments	0	0
Cash, Cash Equivalents, and Short-term Investments	560	873
Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents, at Carrying Value	0	45
Short-term Investments	138	368
Long-term Investments	0	0
Cash, Cash Equivalents, and Short-term Investments	138	413
Corporate Bond Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents, at Carrying Value	0	0
Short-term Investments	865	691
Long-term Investments	187	420
Cash, Cash Equivalents, and Short-term Investments	1,052	1,111
Bank Time Deposits [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents, at Carrying Value	100	200
Short-term Investments	536	382
Long-term Investments	0	0
Cash, Cash Equivalents, and Short-term Investments	$ 636	$ 582

XML

Derivative Financial Instruments (Narrative) (Details) $ in Thousands	1 Months Ended
	Jul. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) MMBTU / d $ / bbl Rate
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Fixed Interest Rate | Rate		1.81%
Notional amount of debt		$ 100,000
Diesel Swap Current Year [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		(1,000)
Derivative, Swap Type, Fixed Price | $ / bbl		63.00
Subsequent Event [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Proceeds from Termination of Diesel Derivatives	$ 321

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Derivative Financial Instruments (Schedule Of Oil Derivative Contracts Volume And Weighted Average Prices) (Details)	Jul. 31, 2017 bbl / d $ / bbl	Jun. 30, 2017 bbl / d $ / bbl
Oil contracts [Member] | Collar Contract For Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d		6,000
Oil contracts [Member] | Collar Contract For Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d		6,000
Oil contracts [Member] | Collar Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d		0
Oil contracts [Member] | Collar Contracts With Short Puts For Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d		147,000
Oil contracts [Member] | Collar Contracts With Short Puts For Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d		155,000
Oil contracts [Member] | Collar Contracts With Short Puts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d		71,000
Oil contracts, price per bbl [Member] | Collar Contract For Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Average Cap Price		70.40
Derivative, Average Floor Price		50.00
Oil contracts, price per bbl [Member] | Collar Contract For Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Average Cap Price		70.40
Derivative, Average Floor Price		50.00
Oil contracts, price per bbl [Member] | Collar Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Average Cap Price		0.00
Derivative, Average Floor Price		0.00
Oil contracts, price per bbl [Member] | Collar Contracts With Short Puts For Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Average Cap Price		62.03
Derivative, Average Floor Price		49.81
Derivative, Notional Amount, Price Per Unit		41.07
Oil contracts, price per bbl [Member] | Collar Contracts With Short Puts For Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Average Cap Price		62.12
Derivative, Average Floor Price		49.82
Derivative, Notional Amount, Price Per Unit		41.02
Oil contracts, price per bbl [Member] | Collar Contracts With Short Puts for Year 2 [Member]
Derivative [Line Items]
Derivative, Average Cap Price		60.38
Derivative, Average Floor Price		50.07
Derivative, Notional Amount, Price Per Unit		40.00
Subsequent Event [Member] | Oil contracts [Member] | Collar Contracts With Short Puts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	26,000
Subsequent Event [Member] | Oil contracts, price per bbl [Member] | Collar Contracts With Short Puts for Year 2 [Member]
Derivative [Line Items]
Derivative, Average Cap Price	55.01
Derivative, Average Floor Price	45.00
Derivative, Notional Amount, Price Per Unit	35.00

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Derivative Financial Instruments Derivative Financial Instruments (Schedule of NGL Derivative Contracts Volume and Weighted Average Prices) (Details)	Jun. 30, 2017 bbl / d MMBTU / d $ / MMBTU $ / bbl
NGL contract, in BBLS [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	2,500
NGL contract, MMBtu Equivalent [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d	6,920
Butane [Member] | NGL contract, in BBLS [Member] | Collar Contracts With Short Puts For Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	2,000
Butane [Member] | NGL contract, in BBLS [Member] | Collar Contracts With Short Puts For Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	0
Butane [Member] | NGL contract, in BBLS [Member] | Collar Contracts With Short Puts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	0
Butane [Member] | NGL contract, in BBLS [Member] | Collar Contracts With Short Puts for Year 3 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	0
Butane [Member] | NGL contracts, price per BBL [Member] | Collar Contracts With Short Puts For Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Average Cap Price	36.12
Derivative, Average Floor Price	29.25
Derivative, Notional Amount, Price Per Unit	23.40
Butane [Member] | NGL contracts, price per BBL [Member] | Collar Contracts With Short Puts For Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Average Cap Price	0.00
Derivative, Average Floor Price	0.00
Derivative, Notional Amount, Price Per Unit	0.00
Butane [Member] | NGL contracts, price per BBL [Member] | Collar Contracts With Short Puts for Year 2 [Member]
Derivative [Line Items]
Derivative, Average Cap Price	0.00
Derivative, Average Floor Price	0.00
Derivative, Notional Amount, Price Per Unit	0.00
Butane [Member] | NGL contracts, price per BBL [Member] | Collar Contracts With Short Puts for Year 3 [Member]
Derivative [Line Items]
Derivative, Average Cap Price	0.00
Derivative, Average Floor Price	0.00
Derivative, Notional Amount, Price Per Unit	0.00
Ethane [Member] | NGL contract, in BBLS [Member] | Collar Contract For Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	3,000
Ethane [Member] | NGL contract, in BBLS [Member] | Collar Contract For Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	3,000
Ethane [Member] | NGL contract, in BBLS [Member] | Collar Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	0
Ethane [Member] | NGL contract, in BBLS [Member] | Collar Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bbl / d	0
Ethane [Member] | NGL contracts, price per BBL [Member] | Collar Contract For Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Average Cap Price	11.83
Derivative, Average Floor Price	8.68
Ethane [Member] | NGL contracts, price per BBL [Member] | Collar Contract For Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Average Cap Price	11.83
Derivative, Average Floor Price	8.68
Ethane [Member] | NGL contracts, price per BBL [Member] | Collar Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Average Cap Price	0.00
Derivative, Average Floor Price	0.00
Ethane [Member] | NGL contracts, price per BBL [Member] | Collar Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Average Cap Price	0.00
Derivative, Average Floor Price	0.00
Ethane [Member] | NGL contract, MMBtu Equivalent [Member] | Basis Swap Contracts for Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d	6,920
Ethane [Member] | NGL contract, MMBtu Equivalent [Member] | Basis Swap Contracts for Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d	6,920
Ethane [Member] | NGL contract, MMBtu Equivalent [Member] | Basis Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d	6,920
Ethane [Member] | NGL contract, MMBtu Equivalent [Member] | Basis Swap Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d	6,920
Ethane [Member] | NGL contract, price per MMBtu Equivalent [Member] | Basis Swap Contracts for Third Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / MMBTU	1.60
Ethane [Member] | NGL contract, price per MMBtu Equivalent [Member] | Basis Swap Contracts for Fourth Quarter of Year One [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / MMBTU	1.60
Ethane [Member] | NGL contract, price per MMBtu Equivalent [Member] | Basis Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / MMBTU	1.60
Ethane [Member] | NGL contract, price per MMBtu Equivalent [Member] | Basis Swap Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / MMBTU	1.60

XML

Derivative Financial Instruments Derivative Financial Instruments (Schedule of Gas Derivative Contracts Volume and Weighted Average Prices) (Details)	Jul. 31, 2017 MMBTU / d $ / MMBTU	Jun. 30, 2017 MMBTU / d $ / MMBTU
Collar Contracts With Short Puts For Third Quarter of Year One [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		290,000
Collar Contracts With Short Puts For Third Quarter of Year One [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Average Cap Price		3.57
Derivative, Average Floor Price		2.95
Derivative, Notional Amount, Price Per Unit		2.47
Collar Contracts With Short Puts For Fourth Quarter of Year One [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		300,000
Collar Contracts With Short Puts For Fourth Quarter of Year One [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Average Cap Price		3.60
Derivative, Average Floor Price		2.96
Derivative, Notional Amount, Price Per Unit		2.47
Collar Contracts With Short Puts for Year 2 [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		62,329
Collar Contracts With Short Puts for Year 2 [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Average Cap Price		3.56
Derivative, Average Floor Price		2.91
Derivative, Notional Amount, Price Per Unit		2.37
Mid-Continent [Member] | Basis Swap Contracts for Third Quarter of Year One [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		45,000
Mid-Continent [Member] | Basis Swap Contracts for Third Quarter of Year One [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Swap Type, Price Differential		(0.32)
Mid-Continent [Member] | Basis Swap Contracts for Fourth Quarter of Year One [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		45,000
Mid-Continent [Member] | Basis Swap Contracts for Fourth Quarter of Year One [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Swap Type, Price Differential		(0.32)
Mid-Continent [Member] | Basis Swap Contracts for Year 2 [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		0
Mid-Continent [Member] | Basis Swap Contracts for Year 2 [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Swap Type, Price Differential		0.00
Permian Basin [Member] | Basis Swap Contracts for Third Quarter of Year One [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		0
Permian Basin [Member] | Basis Swap Contracts for Third Quarter of Year One [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Swap Type, Price Differential		0.00
Permian Basin [Member] | Basis Swap Contracts for Fourth Quarter of Year One [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		26,522
Permian Basin [Member] | Basis Swap Contracts for Fourth Quarter of Year One [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Swap Type, Price Differential		0.30
Permian Basin [Member] | Basis Swap Contracts for Year 2 [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d		39,945
Permian Basin [Member] | Basis Swap Contracts for Year 2 [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Swap Type, Price Differential		0.30
Permian Basin [Member] | Subsequent Event [Member] | Basis Swap Contracts for Third Quarter of Year One [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d	6,739
Permian Basin [Member] | Subsequent Event [Member] | Basis Swap Contracts for Third Quarter of Year One [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Swap Type, Price Differential	0.26
Permian Basin [Member] | Subsequent Event [Member] | Basis Swap Contracts for Year 2 [Member] | Gas contracts, in MMBTU [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBTU / d	11,726
Permian Basin [Member] | Subsequent Event [Member] | Basis Swap Contracts for Year 2 [Member] | Gas contracts, price per MMBTU [Member]
Derivative [Line Items]
Derivative, Swap Type, Price Differential	0.31

XML

Derivative Financial Instruments (Schedule Of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative Assets, Current	$ 156	$ 14
Derivative Assets, Noncurrent	29	0
Derivative Liabilities, Current	3	77
Derivative Liabilities, Noncurrent	1	7
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	185	14
Derivative Liability, Fair Value, Net	4	84
Not Designated as Hedging Instrument [Member] | Commodity Price Derivatives [Member] | Derivatives - Current [Member]
Derivative [Line Items]
Total derivatives, Asset, Gross	153	33
Derivative Liability, Fair Value, Gross Liability	5	102
Derivative Assets Offset In Balance Sheet	(2)	(25)
Derivative Liabilities Offset In Balance Sheet	(2)	(25)
Derivative Assets, Current	151	8
Derivative Liabilities, Current	3	77
Not Designated as Hedging Instrument [Member] | Commodity Price Derivatives [Member] | Derivatives - Noncurrent [Member]
Derivative [Line Items]
Total derivatives, Asset, Gross	30
Derivative Liability, Fair Value, Gross Liability	2	7
Derivative Assets Offset In Balance Sheet	(1)
Derivative Liabilities Offset In Balance Sheet	(1)	0
Derivative Assets, Noncurrent	29
Derivative Liabilities, Noncurrent	1	7
Not Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member] | Derivatives - Current [Member]
Derivative [Line Items]
Total derivatives, Asset, Gross	5	6
Derivative Assets Offset In Balance Sheet	0	0
Derivative Assets, Current	$ 5	$ 6

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Derivative Financial Instruments (Schedule Of Derivative Obligations Under Terminated Hedge Arrangements) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Derivative gains, net	$ 135	$ (229)	$ 286	$ (186)
Commodity Price Derivatives [Member] | Derivative Gains (Losses), Net [Member]
Derivative [Line Items]
Derivative gains, net	136	(222)	287	(177)
Interest Rate Derivatives [Member] | Derivative Gains (Losses), Net [Member]
Derivative [Line Items]
Derivative gains, net	$ (1)	$ (7)	$ (1)	$ (9)

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Exploratory Costs (Schedule Of Capitalized Exploratory Well And Project Activity) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Beginning capitalized exploratory costs	$ 432	$ 323
Additions to exploratory costs pending the determination of proved reserves	489	895
Reclassification due to determination of proved reserves	(477)	(765)
Exploratory well costs charged to exploration expense	(1)	(10)
Ending capitalized exploratory costs	$ 443	$ 443

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Exploratory Costs Exploratory Well Costs (Capitalized Exploratory Costs And the Number Of Projects For Which Exploratory Costs Have Been Capitalized) (Details) $ in Millions	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Capitalized Exploratory Well Costs that Have Been Capitalized for Period of One Year or Less	$ 420		$ 318
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year	23		5
Capitalized Exploratory Well Costs	$ 443	$ 432	$ 323
Projects that have Exploratory Well Costs that have been Capitalized for Period Greater than One Year, Number of Projects	12		3

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Long-Term Debt (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Maximum Borrowing Capacity		$ 1,500
Outstanding borrowing		0
Repayments of Long-term Debt		$ 485	$ 0
Six Point Six Five Percent Senior Notes Due Two Thousand Seventeen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.65%
Repayments of Long-term Debt	$ 485
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.875%
Senior Notes		$ 450

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Incentive Plans Incentive Plans (Stock-based compensation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 27	$ 29	$ 57	$ 53
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	137		$ 137
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Restricted Stock Liability Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	31		$ 31
Accounts Payable, Current	$ 10		$ 10		$ 22

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Incentive Plans Incentive Plans (Share Based Incentive Award Activity) (Details) - shares	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Restricted Stock Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	945,958	1,077,227
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	320,103
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(437,845)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(13,527)
Restricted Stock Liability Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	264,952	290,552
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	108,911
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(129,499)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(5,012)
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	237,600	178,556
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	59,044
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	159,378	159,378
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	0

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Asset Retirement Obligations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning asset retirement obligations	$ 297	$ 285	$ 297	$ 285
Asset Retirement Obligation, Liabilities Incurred	1	0	1	0
Changes in estimates	7	0	7	0
Disposition of wells	(7)	0	(7)	0
Liabilities settled	(9)	(9)	(14)	(13)
Accretion of discount from continuing operations	5	5	10	9
Ending asset retirement obligations	294	$ 281	294	$ 281
Asset retirement obligations, current portions	$ 46		$ 46		$ 39

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Commitments And Contingencies Commitments and Contingencies (Details)	6 Months Ended
	Jun. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Pending Future Environmental Sanction Individual	$ 45,000
Pending Future Environmental Sanction Aggregate	100,000
Future Rent Expense	$ 33,000,000

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Interest And Other Income (Components Of Interest And Other Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest and Other Income [Abstract]
Interest income	$ 10	$ 5	$ 16	$ 9
Income Tax Credits and Adjustments	(5)	0	(8)	0
Deferred compensation plan income	1	0	3	2
Other income	0	1	3	2
Total interest and other income	$ 16	$ 6	$ 30	$ 13

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Other Expense (Schedule Of Components Of Other Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Expense [Abstract]
Transportation commitment charges	$ 43	$ 25	$ 82	$ 50
Third-party vertical integration services	5	16	11	29
Above market and idle drilling and well services equipment charges	0	11	0	47
Other	11	15	26	28
Total other expense	59	67	119	154
GrossRevenuesIncludedInThirdPartyLossFromVerticalIntegrationServices	23	56	42	124
GrossExpensesIncludedInThirdPartyLossFromVerticalIntegrationServices	$ 28	$ 72	$ 53	$ 153

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Income Taxes (Schedule Of Income Tax (Provisions) Benefits Attributable To Income From Continuing Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Deferred income taxes	$ (121)	$ 143	$ (90)	$ 284
Income tax benefit (provision)	$ (121)	$ 143	$ (90)	$ 284
Effective Tax Rate	34.00%	35.00%	32.00%	35.00%
Statutory Tax Rate			35.00%
Effective Income Tax Rate Reconciliation, Deduction, Amount			$ 8
Unrecognized Tax Benefits	$ 119		$ 119		$ 112

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Net Income Per Share (Reconciliation Of Earnings Attributable To Common Stockholders, Basic And Diluted) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Operating Activities Segment [Line Items]
Income (loss) from continuing operations attributable to parent	$ 233	$ (268)	$ 191	$ (535)
Participating Securities, Distributed and Undistributed Earnings, Basic	(2)	0	(2)	0
Basic income (loss) from continuing operations attributable to common stockholders	231	(268)	189	(535)
Diluted income (loss) from continuing operations attributable to common stockholders	$ 231	$ (268)	$ 189	$ (538)

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Net Income Per Share (Reconciliation Of Basic To Diluted Weighted Average Common Shares Outstanding) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Basic weighted average shares outstanding	170	164	170	163
Diluted	170	164	170	163