Southwestern Energy (SWN) 10-Q 27 Apr 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 25, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Entity Registrant Name	SOUTHWESTERN ENERGY CO
Entity Central Index Key	7,332
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		505,869,805
Trading Symbol	SWN

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Revenues:
Gas sales	$ 503	$ 315
Oil sales	23	11
NGL sales	40	17
Marketing	253	198
Gas gathering	27	38
Total Operating Revenues	846	579
Operating Costs and Expenses:
Marketing purchases	251	196
Operating expenses	147	165
General and administrative expenses	50	54
Restructuring charges		64
Depreciation, depletion and amortization	106	143
Impairment of natural gas and oil properties		1,034
Taxes, other than income taxes	26	23
Total Operating Costs and Expenses	580	1,679
Operating Income (Loss)	266	(1,100)
Interest Expense:
Interest on debt	58	53
Other interest charges	2	2
Interest capitalized	(28)	(41)
Total Interest Expense	32	14
Gain (Loss) on Derivatives	116	(14)
Loss on Early Extinguishment of Debt	(1)
Other Income (Loss), Net	2	(3)
Income (Loss) Before Income Taxes	351	(1,131)
Provision (Benefit) for Income Taxes:
Deferred		1
Provision (Benefit) for Income Taxes		1
Net Income (Loss)	351	(1,132)
Mandatory convertible preferred stock dividend	27	27
Participating securities - mandatory convertible preferred stock	43
Net Income (Loss) Attributable to Common Stock	$ 281	$ (1,159)
Earnings (Loss) Per Common Share:
Basic	$ 0.57	$ (3.03)
Diluted	$ 0.57	$ (3.03)
Weighted Average Common Shares Outstanding:
Basic	493,068,000	382,870,847
Diluted	494,494,995	382,870,847

CONDENSED CONSOLIDATED STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)		$ 351	$ (1,132)
Change in value of pension and other postretirement liabilities:
Amortization of prior service cost and net loss included in net periodic pension cost	[1]		1
Change in currency translation adjustment			3
Comprehensive income (loss)		$ 351	$ (1,128)
[1]	Net of $1 million in taxes for the three months ended March 31, 2017 and 2016.

CONDENSED CONSOLIDATED STATEME4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Amortization of prior service cost and net loss included in net periodic pension cost, tax	$ 1	$ 1

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,382	$ 1,423
Accounts receivable, net	310	363
Derivative assets	58	51
Other current assets	39	35
Total current assets	1,789	1,872
Natural gas and oil properties, using the full cost method, including $2,078 million as of March 31, 2017 and $2,105 million as of December 31, 2016 excluded from amortization	22,942	22,653
Gathering systems	1,306	1,299
Other	536	537
Less: Accumulated depreciation, depletion and amortization	(19,641)	(19,534)
Total property and equipment, net	5,143	4,955
Other long-term assets	264	249
TOTAL ASSETS	7,196	7,076
Current liabilities:
Short-term debt	266	41
Accounts payable	436	473
Taxes payable	50	59
Interest payable	29	74
Dividends payable	27	27
Derivative liabilities	280	355
Other current liabilities	33	35
Total current liabilities	1,121	1,064
Long-term debt	4,364	4,612
Pension and other postretirement liabilities	47	49
Other long-term liabilities	386	434
Total long-term liabilities	4,797	5,095
Commitments and contingencies (Note 10)
Equity:
Common stock, $0.01 par value; 1,250,000,000 shares authorized; issued 502,497,469 shares as of March 31, 2017 (does not include 3,348,214 shares issued on April 17, 2017 on account of a dividend declared on March 21, 2017) and 495,248,369 as of December 31, 2016	5	5
Preferred stock, $0.01 par value, 10,000,000 shares authorized, 6.25% Series B Mandatory Convertible, $1,000 per share liquidation preference, 1,725,000 shares issued and outstanding as of March 31, 2017 and December 31, 2016, conversion in January 2018
Additional paid-in capital	4,687	4,677
Accumulated deficit	(3,374)	(3,725)
Accumulated other comprehensive loss	(39)	(39)
Common stock in treasury, 31,269 shares as of March 31, 2017 and December 31, 2016	(1)	(1)
Total equity	1,278	917
TOTAL LIABILITIES AND EQUITY	$ 7,196	$ 7,076

CONDENSED CONSOLIDATED BALANCE6

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Natural gas and oil properties, using the full cost method, costs excluded from amortization	$ 2,078	$ 2,105
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,250,000,000	1,250,000,000
Common stock, shares issued	502,497,469	495,248,369
Common stock, date dividend to be paid	Apr. 17, 2017
Common stock, date dividend declared	Mar. 21, 2017
Treasury stock, shares	31,269	31,269
Series B Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, dividend rate	6.25%	6.25%
Liquidation preference per share	$ 1,000	$ 1,000
Preferred stock, shares issued	1,725,000	1,725,000
Preferred stock, shares outstanding	1,725,000	1,725,000

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities:
Net income (loss)	$ 351	$ (1,132)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	106	143
Impairment of natural gas and oil properties		1,034
Amortization of debt issuance costs	2	2
Deferred income taxes		1
(Gain) loss on derivatives, unsettled	(146)	21
Stock-based compensation	6	9
Restructuring charges		42
Loss on early extinguishment of debt	1
Other	(2)	5
Change in assets and liabilities:
Accounts receivable	53	103
Accounts payable	(13)	(124)
Taxes payable	(8)	(12)
Interest payable	(24)	(11)
Other assets and liabilities	(14)	11
Net cash provided by operating activities	312	92
Cash Flows From Investing Activities:
Capital investments	(340)	(196)
Proceeds from sale of property and equipment	2
Other	4
Net cash used in investing activities	(334)	(196)
Cash Flows From Financing Activities:
Payments on short-term debt	(25)
Payments on revolving credit facility		(864)
Borrowings under revolving credit facility		2,600
Payments on commercial paper		(242)
Borrowings under commercial paper		242
Change in bank drafts outstanding	6	(19)
Preferred stock dividend		(27)
Other		(4)
Net cash provided by (used in) financing activities	(19)	1,686
Increase (decrease) in cash and cash equivalents	(41)	1,582
Cash and cash equivalents at beginning of year	1,423	15
Cash and cash equivalents at end of period	$ 1,382	$ 1,597

CONDENSED CONSOLIDATED STATEME8

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - 3 months ended Mar. 31, 2017 - USD ($) $ in Millions		Common Stock [Member]	Preferred Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	[1]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock in Treasury [Member]	Total
Balance, shares at Dec. 31, 2016		495,248,369	1,725,000
Balance at Dec. 31, 2016		$ 5		$ 4,677	$ (3,725)		$ (39)	$ (1)	$ 917
Comprehensive income:
Net income					351				351
Other comprehensive income
Comprehensive income (loss)									351
Stock-based compensation				10					10
Preferred stock dividend, shares	[2]	2,751,410
Issuance of restricted stock, shares		4,549,122
Cancellation of restricted stock, shares		(113,185)
Performance units vested, shares		121,208
Tax withholding - stock compensation, shares		(59,455)
Balance, shares at Mar. 31, 2017		502,497,469	1,725,000
Balance at Mar. 31, 2017		$ 5		$ 4,687	$ (3,374)		$ (39)	$ (1)	$ 1,278
[1]	Includes a net cumulative-effect adjustment of $59 million related to the recognition of previously unrecognized windfall tax benefits resulting from the adoption of ASU 2016-09 as of the beginning of 2017. This adjustment was offset by an increase in net deferred tax assets and the related income tax valuation allowance of the same amount.
[2]	Does not include 3,346,865 shares issued on April 17, 2017 and distributed to holders of the Company's mandatory convertible preferred stock.

CONDENSED CONSOLIDATED STATEME9

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Millions	Apr. 17, 2017	Mar. 31, 2017
Net cumulative-effect adjustment		$ 59
Common stock, date dividend to be paid		Apr. 17, 2017
Subsequent Event [Member]
Common stock, shares issued as stock dividend	3,346,865

Basis Of Presentation

Basis Of Presentation	3 Months Ended
	Mar. 31, 2017
Basis Of Presentation [Abstract]
Basis Of Presentation	(1) BASIS OF PRESEN TATION  Southwestern Energy Company (including its subsidiaries, collectively “Southwestern” or the “Company”) is an independent energy company engaged in natural gas , oil and NGL exploration, development and production (“E&P”). The Company is also focused on creating and capturing additional value through its natural gas gathering and marketing businesses (“Midstream Services”). Southwestern conducts most of its businesses through subsidiaries and operates principally in two segments: E&P and Midstream Services.  Exploration and Production. Southwestern’s primary business is the exploration for and production of natural gas, oil and NGLs, with current operations principally focused on the development of unconventional natural gas reservoirs located in Pennsylvania, West Virginia and Arkansas. The Company’s operations in northeast Pennsylvania, herein referred to as “Northeast Appalachia,” are primarily focused on the unconventional natural gas reservoir known as the Marcellus Shale. Operations in West Virginia and southwest Pennsylvania, herein referred to as “Southwest Appalachia,” are focused on the Marcellus Shale, the Utica and the Upper Devonian unconventional natural gas and oil reservoirs. Collectively, Southwestern refers to its properties located in Pennsylvania and West Virginia as the “Appalachian Basin.” The Company’s operations in Arkansas are primarily focused on an unconventional natural gas reservoir known as the Fayetteville Shale. Southwestern has activities ongoing in Colorado and Louisiana, along with other areas in which it is currently assessing new development opportunities. The Company also has drilling rigs located in Pennsylvania, West Virginia and Arkansas, as well as in other operating areas, and provides oilfield products and services, principally serving its E&P operations.  Midstream Services . Through the Company’s affiliated midstream subsidiaries, Southwestern engage s in natural gas gathering activities in Arkansas and Louisiana. These activities primarily support the Company’s E&P operations and generate revenue from fees associated with the gathering of natural gas. Southwestern’s marketing activities capture opportunities that arise through the marketing and transportation of the natural gas, oil and NGLs produced in its E&P operations.  The accompanying unaudited condensed consolidated financial statements were prepared using accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and in accordance with the rules and regulations of the Securities and Exchange Commission. Certain information relating to the Company’s organization and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been appropriately condensed or omitted in this Quarterly Report. The Company believes the disclosures made are adequate to make the information presented not misleading.  The unaudited condensed consolidated financial statements contained in this report include all normal and recurring material adjustments that, in the opinion of management, are necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented herein. It is recommended that these unaudited condensed consolidated financial statements be read in conjunction with the consolidated financial statements and the notes thereto included in the Company’s Annual Report for the year ended December 31, 201 6 (“2016 Annual Report”).  The Company’s significant accounting policies, which have been reviewed and approved by the Audit Committee of the Company’s Board of Directors, are summarized in Note 1 in the Notes to the Consolidated Financial Statement s included in the Company’s 2016 Annual Report. 

Cash And Cash Equivalents

Cash And Cash Equivalents	3 Months Ended
	Mar. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash And Cash Equivalents	(2) CASH AND CASH EQUIVALENTS  The following table presents a summary of c ash and cash equivalents as of March 31, 2017 and December 31, 2016 :     March 31 , December 31,  201 7 201 6  (in millions)   Cash $ 265 $ 254  Marketable securities (1) 1,117 1,169  Total cash and cash equivalents $ 1,382 $ 1,423  (1) Consists of government stable value money market funds . 

Reduction In Workforce

Reduction In Workforce	3 Months Ended
	Mar. 31, 2017
Reduction In Workforce [Abstract]
Reduction In Workforce	(3) REDUC TION IN WORKFORCE  In January 2016, the Company announced a 40% workforce reduction as a result of lower anticipated drilling activity. This reduction was substantially complete d in the first quarter of 2016 . In April 2016, the Company also partially restructured executive management, which was substantially completed in the second quarter of 2016.  The following table presents a summary of the restructuring charges for the three months ended March 31, 2016 :     For the three months ended  March 31, 2016  (in millions)  Severance (including payroll taxes) $ 42  Stock-based compensation 18  Pension and other postretirement benefits 3  Outplacement services, other 1  Total restructuring charges (1) $ 64  (1) Total restructuring charges were $61 million and $3 million for the Company’s E&P and Midstream Services segments, respectively.  Severance payments and other separation costs related to restructuring were substantially completed by the end of 2016.  

Natural Gas And Oil Properties

Natural Gas And Oil Properties	3 Months Ended
	Mar. 31, 2017
Natural Gas And Oil Properties [Abstract]
Natural Gas And Oil Properties	( 4 ) NATURAL GA S AND OIL PROPERTIES  The Company utilizes the full cost method of accounting for costs related to the exploration, development an d acquisition of natural gas and oil properties. Under this method, all such costs (productive and nonproductive), including salaries, benefits and other internal costs directly attributable to these activities a re capitalized on a country-by- country basis and amortized over the estimated lives of the properties using the units-of-production method. These capitalized costs are subject to a ceiling test that limits such pooled costs , net of applicable deferred taxes, to the aggregate of the present value of future net revenues attributable to proved natural gas , oil and NGL reserves discounted at 10 % (standardized measure) . Any costs in excess of the ceiling are written off as a non-cash expense. The expense may not be reversed in future periods, even though higher natural gas, oil and NGL prices may subsequently increase the ceiling. Companies using the full cost method are required to use the average quoted price from the first day of each month from the previous 12 months, incl uding the impact of derivatives designated for hedge accounting , to calculate the ceiling value of their reserves.  Using the average quoted price from the first day of each month from the previous 12 months for Henry Hub natural gas of $ 2.73 per MMBtu, West Texas Intermediate oil of $ 44.10 per barrel and NGLs of $ 10.17 per barrel , adjusted for differentials, the Company’s net book value of its United States natural gas and oil properties did not exceed the ceiling amount and did not result in a ceiling test impairment at March 31 , 201 7 . The Company had no hedge positions that were designated for hedge account ing as of March 31 , 201 7 . Decreases in market prices as well as changes in production rates, levels of reserves, evaluation of costs excluded from amortization, future development costs and production costs could result in future ceiling test impairments.  Using the average quoted price from the first day of each month from the previous 12 months for Henry Hub natural gas of $ 2.40 per MMBtu, West Texas Intermediate oil of $ 42.77 per barrel and NGLs of $5.76 per barrel , adjusted for differentials, the net book value of the Company’s United States natura l gas and oil properties exceeded the ceiling by $641 million (net of tax) at March 31, 2016 and result ed in a non-cash ceiling test impairment . The Company had no hedge positions that were designated for hedge accounting as of March 31, 2016. 

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	( 5 ) EARN INGS PER SHARE  Basic earnings per common share is computed by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding during the reportable period. The diluted earnings per share calculation adds to the weighted average number of common shares outstanding: the incremental shares that would have been outstanding assuming the exercise of dilutive stock options, the vesting of unvested restricted shares of common stock , performance units and the assumed conversion of mandatory convertible preferred stock . An antidilutive impact is an increase in earnings per share or a reduction in net loss per share resulting from the conversion, exercise, or contingent issuance of certain securities.  In July 2016, the Company completed an underwritten public offering of 98,900,000 shares of its common stock, with an offering price to the public of $13.00 per share. Net proceeds from the common stock offering were approximately $1,247 million, after underwriting discount and offering expenses. The proceeds from the offering were used to repay $375 million of the $750 million term loan entered into in November 2015 and to settle certain tender offers by purchasing an aggregate principal amount of approximately $700 million of the Company’s outstanding senior notes due in the first quarter of 2018. The remaining proceeds of the offering have been used for general corporate purposes.  The mandatory convertible pref erred stock issued in January 2015 entitles the holder to a proportional fractional interest in the rights and preferences of the convertible preferred stock, including conversion, dividend, liquidation and voting rights. Unless converted earlier at the option of the holders, on or around January 15, 2018 each share of convertible preferred stock will automatically convert into between 37.0028 and 43.4782 shares of the Company’s common stock ( correspondingly, each depositary share will convert into between 1.85014 and 2.17391 shares of the Company’s common stock), subject to customary anti-dilution adjustments, depending on the volume-weighted average price of the Company’s common stock over a 20 trading day averaging period immediately prior to that date. The total potential shares of common stock resulting from the conversion will range from 63,829,830 to 74,999,895 shares.  The mandatory convertible preferred stock has the non-forfeitable right to participate on an as - converted basis at the conversion rate then in effect in any common stock dividends declared and as such, is considered a participating security. A ccordingly , it is included in the computation of basic and diluted earnings per share, pursuant to the two-class method. In the calculation of basic earnings per share attributable to common shareholders, participating securities are allocated earnings based on actual dividend distributions received plus a proportionate share of undistributed net income attributable to common shareholders, if any, after recognizing distributed earnings. The Company’s participating securities do not participate in undistributed net losses because they are not contractually obligated to do so. The following table presents the computation of earnings per share for the three months ended March 31 , 201 7 and 201 6 :       For the three months ended March 31,  2017 2016  (in millions, except share/per share amounts)  Net income (loss) $ 351 $ (1,132)  Mandatory convertible preferred stock dividend 27 27  Participating securities - mandatory convertible preferred stock 43 –  Net income (loss) attributable to common stock $ 281 $ (1,159)   Number of common shares:  Weighted average outstanding 493,068,000 382,870,847  Issued upon assumed exercise of outstanding stock options 82,845 –  Effect of issuance of non-vested restricted common stock 770,429 –  Effect of issuance of non-vested performance units 573,721 –  Effect of issuance of mandatory convertible preferred stock – –  Weighted average and potential dilutive outstanding 494,494,995 382,870,847   Earnings (Loss) per common share:  Basic $ 0.57 $ (3.03)  Diluted $ 0.57 $ (3.03)  The following table presents the common stock shares equivalent excluded from the calculation of diluted earnings per share for the three months ended March 31, 2017 and 2016, as they would have had an antidilutive effect:   For the three months ended March 31,  2017 2016  Unvested stock options 1,854,004 5,732,521  Unvested share-based payment 1,212,396 5,779,820  Performance units – 297,297  Mandatory convertible preferred stock 74,999,895 74,999,895  Total 78,066,295 86,809,533 

Derivatives And Risk Management

Derivatives And Risk Management	3 Months Ended
	Mar. 31, 2017
Derivatives And Risk Management [Abstract]
Derivatives And Risk Management	(6 ) DERIVATIVES A ND RISK MANAGEMENT  The Company is exposed to volatility in market prices and basis di fferentials for natural gas, oil and NGLs which impacts the predictability of its cash flows related to the sale of those commodities. These risks are managed by the Company’s use of certain derivative financial instruments. As of March 3 1, 2017 and December 31, 2016 , the Company’s derivative financial instruments consisted of fixed price swaps, two-way costless collars, three-way costless collars, basis swaps, put and call options, and interest rate swaps. A description of the Company’s derivative financial instruments is provided below:  Fixed price swaps The Company receives a fixed price for the contract and pays a floating market price to the counterparty.  Purchased put options The Company purchases put options based on an index price from the counterparty by payment of a cash premium. If the index price is lower than the put’s strike price at the time of settlement, the Company receives from the counterparty such difference between the index price and the purchased put strike price. If the market price settles above the put’s strike price, no payment is due from either party.  Two-way costless collars Arrangements that contain a fixed floor price (purchased put option) and a fixed ceiling price (sold call option) based on an index price which, in aggregate, have no net cost. At the contract settlement date, (1) if the index price is higher than the ceiling price, the Company pays the counterparty the difference between the index price and ceiling price, (2) if the index price is between the floor and ceiling prices, no payments are due from either party, and (3) if the index price is below the floor price, the Company will receive the difference between the floor price and the index price.  Three-way costless collars Arrangements that contain a purchased put option, a sold call option and a sold put option based on an index price which, in aggregate, have no net cost. At the contract settlement date, (1) if the index price is higher than the sold call strike price, the Company pays the counterparty the difference between the index price and sold call strike price, (2) if the index price is between the purchased put strike price and the sold call strike price, no payments are due from either party, (3) if the index price is between the sold put strike price and the purchased put strike price, the Company will receive the difference between the purchased put strike price and the index price, and (4) if the index price is below the sold put strike price, the Company will receive the difference between the purchased put strike price and the sold put strike price.  Basis swaps Arrangements that guarantee a price differential for natural gas from a specified delivery point. The Company receives a payment from the counterparty if the price differential is greater than the stated terms of the contract and pays the counterparty if the price differential is less than the stated terms of the contract.  Sold call options The Company sells call options in exchange for a premium. I f the market price exceeds the strike price of the call option a t the time of settlement, the Company pays the counterparty such excess on sold call options. If the market price settles below the call’s strike price , no payment is due from either party.  Interest rate swaps Interest rate swaps are used to fix or float interest rates on existing or anticipated indebtedness. The purpose of these instruments is to manage the Company’s existing or anticipated exposure to un favorable interest rate changes.  The Company utilizes counterparties for its derivative instruments that it believes are creditworthy at the time the transactions are entered into , and the Company closely monitors the credit ratings of these counterparties. Additionally, the Company performs both quantitative and qualitative assessments of these counterparties based on their credit ratings and credit default swap rates where applicable. However, the events in the financial markets in recent years demonstrate there can be no assurance that a counterparty will be able to meet its obligations to the Company.  The following table provides information about the Company’s financial instruments that are sensitive to changes in commodity prices and that are used to protect the Company’s exposure. None of the financial instruments below are designated for hedge accounting treatment. The table presents the notional amount in Bcf, the weighted average contract prices and the fair value by expected maturity dates as of March 31, 2017:       Weighted Average Price per MMBtu  Volume (Bcf) Swaps Sold Puts Purchased Puts Sold Calls Basis Differential Fair value at March 31, 2017 (in millions)  Financial protection on production  2017  Fixed price swaps 262 $ 3.07 $ – $ – $ – $ – $ (58)  Two-way costless-collars 65 – – 2.92 3.34 – (11)  Three-way costless-collars 102 – 2.29 2.97 3.30 – (16)  Basis swaps 138 – – – – (1.04) (73)  Total 567 $ (158)  2018  Fixed price swaps 68 $ 3.02 $ – $ – $ – $ – $ (1)  Two-way costless-collars 23 – – 2.97 3.56 – (6)  Three-way costless-collars 245 – 2.39 2.97 3.37 – (6)  Basis swaps 20 – – – – (0.95) (15)  Total 356 $ (28)  2019  Three-way costless-collars 99 $ – $ 2.50 $ 2.95 $ 3.31 $ – $ (2)  Total 99 $ (2)     Weighted Average Price per MMBtu  Volume (Bcf) Sold Calls Fair value at March 31, 2017 (in millions)  Call options  2017 64 $ 3.54 $ (10) (1)  2018 63 3.50 (14)  2019 52 3.50 (10)  2020 32 3.75 (5)  Total 211 $ (39)  (1) Ex clude s $5 million in premiums paid related to certain call options recognized as a component of derivative assets within current assets on the unaudited condensed consolidated balance sheet. As certain call options settle, the premium will be amortized and recognized as a component of gain (loss) on derivatives on the unaudited condensed consolidated statement of operations.  The balance sheet classification of the assets and liabilities related to derivative financial instruments (none of which are designated for hedge accounting treatment) are summarized below as of March 31, 2017 a nd December 31, 2016 :     Derivative Assets  Balance Sheet Classification Fair Value  March 31, 2017 December 31, 2016  (in millions)  Derivatives not designated as hedging instruments:  Fixed price swaps Derivative assets $ 2 $ –  Two-way costless collars Derivative assets 11 8  Three-way costless collars Derivative assets 23 11  Basis swaps Derivative assets 2 32 Call options Derivative assets 15 –  Fixed price swaps Other long-term assets 7 1  Two-way costless collars Other long-term assets – 2  Three-way costless collars Other long-term assets 120 100  Basis swaps Other long-term assets – 1  Total derivative assets $ 180 (1) $ 155   Derivative Liabilities  Balance Sheet Classification Fair Value  March 31, 2017 December 31, 2016  (in millions)  Derivatives not designated as hedging instruments:  Fixed price swaps Derivative liabilities $ 68 $ 175  Two-way costless collars Derivative liabilities 28 49  Three-way costless collars Derivative liabilities 62 70  Basis swaps Derivative liabilities 89 13  Call options Derivative liabilities 32 46  Interest rate swaps Derivative liabilities 1 2  Fixed price swaps Other long-term liabilities – 3  Two-way costless collars Other long-term liabilities – 9  Three-way costless collars Other long-term liabilities 105 122  Basis swaps Other long-term liabilities 1 5  Call options Other long-term liabilities 22 35  Interest rate swaps Other long-term liabilities 1 1  Total derivative liabilities $ 409 $ 530  (1) Does not include $5 million in premiums paid related to certain call options currently recognized as a component of derivative assets within current assets on the unaudited condensed consolidated balance sheet. As certain call options settle, the premium will be amortized and recognized as a component of gain (loss) on derivatives on the unaudited condensed consolidated statement of operations.  At March 31, 2017, the net fair value of the Company’s financial instruments related to natural gas was a $227 million liability. The net fair value of the Company’s interest rate swaps was a $2 million liability as of March 31, 2017.  Derivative Contracts Not Designated for Hedge Accounting  As of March 31 , 201 7 , the Company had no positions designated for hedge accounting treatment . G ains and losses on derivatives that are not designated for hedge accounting treatment , or that do not meet hedge accounting requirements , are recorded as a component of gain (loss) on derivatives on the unaudited condensed consolidated statements of operations. Accordingly, the gain (loss) on derivatives component of the statement s of operations reflects the gains and losses on both settled and unsettled derivatives. The Company calculates gains and losses on settled derivatives as the summation of gains and losses on positions which have settled within the reporting period. Only the settled gains and losses are included in the Company’s realized commodity price calculations.  The Company is a party to interest rate swaps that were entered into to mitigate the Company’s exposure to volatility in interest rates. The interest rate swaps have a notional amount of $170 million and expire in June 2020 . The Company did not designate the interest rate swaps for hedge accounting treatment . Changes in the fair value of the interest rate swaps are included in gain (loss) on derivatives o n the unaudited condensed consolidated statements of operations.  The following tables summarize the before tax effect of fixed price swaps, purchased put options, two-way costless collars, three-way costless collars, basis swaps, call options and interest rate swaps not designated for hedge accounting on the unaudited condensed consolidated statements of operations for the three months ended March 31 , 201 7 and 201 6 :      Gain (Loss) on Derivatives, Unsettled  Recognized in Earnings  Consolidated Statement of Operations For the three months ended  Classification of Gain (Loss) March 31,  Derivative Instrument on Derivatives, Unsettled 2017 2016  (in millions)  Fixed price swaps Gain (Loss) on Derivatives $ 118 $ 20  Purchased put options Gain (Loss) on Derivatives – 15  Two-way costless-collars Gain (Loss) on Derivatives 31 –  Three-way costless- collars Gain (Loss) on Derivatives 57 –  Basis swaps Gain (Loss) on Derivatives (103) (3)  Call options Gain (Loss) on Derivatives 42 (50)  Interest rate swaps Gain (Loss) on Derivatives 1 (3)  Total gain (loss) on unsettled derivatives $ 146 $ (21)   Gain (Loss) on Derivatives, Settled (1)  Recognized in Earnings  Consolidated Statement of Operations For the three months ended  Classification of Gain (Loss) March 31,  Derivative Instrument on Derivatives, Settled 2017 2016  (in millions)  Fixed price swaps Gain (Loss) on Derivatives $ (16) $ 4  Two-way costless-collars Gain (Loss) on Derivatives (3) –  Three-way costless-collars Gain (Loss) on Derivatives (4) –  Basis swaps Gain (Loss) on Derivatives (1) 4  Call options Gain (Loss) on Derivatives (6) –  Interest rate swaps Gain (Loss) on Derivatives – (1)  Total gain (loss) on settled derivatives (2) $ (30) $ 7   Total gain (loss) on derivatives $ 116 $ (14)  (1) The Company calculates gain (loss) on derivatives, settled, as the summation of gains and losses on positions that have settled within the period. (2) Excluding interest rate swaps, these amounts are included, along with gas sales revenues, in the calculation of the Company’s realized natural gas price.  Derivative Contracts Designated for Hedge Accounting  A ll derivatives are recognized in the balance sheet as either an asset or liability and are measured at fair value , other than transactions for which normal purchase/normal sale is applied. Certain criteria must be satisfied in order for derivative financial instruments to be designated for hedge accounting . Unrealized gains and losses related to unsettled derivatives that have been designated for hedge accounting treatment are recorded in either earnings or as a component of other comprehensive income until settled. In the period of settlement, the Company recognizes the gains and losses from these qualifying hedges in gas sales revenues. As of March 31, 2017 and 2016 , the Company had no positions designated for hedge accounting treatment .

Reclassifications From Accumula

Reclassifications From Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2017
Reclassifications From Accumulated Other Comprehensive Income (Loss) [Abstract]
Reclassifications From Accumulated Other Comprehensive Income (Loss)	(7 ) RECL ASSIFICATIONS FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)  The following tables detail the components of accumulated other comprehensive income (loss) and the related tax effects for the three months ended March 31 , 201 7 :     March 31, 2017  Pension and Other Postretirement Foreign Currency Total  (in millions)  Beginning balance, December 31, 2016 $ (19) $ (20) $ (39)  Other comprehensive income (loss) before reclassifications – – –  Amounts reclassified from other comprehensive income (loss) (1) – – –  Net current-period other comprehensive income (loss) – – –  Ending balance, March 31, 2017 $ (19) $ (20) $ (39)   (1 ) See separate table below for details about these reclassifications .  1        Details about Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Operations Amount Reclassified from Accumulated Other Comprehensive Income  For the three months ended March 31, 2017  (in millions)  Pension and other postretirement:  Amortization of prior service cost and net loss (1) General and administrative expenses $ 1  Provision for income taxes 1  Net income (loss) $ –   Total reclassifications for the period Net income (loss) $ –  (1 ) See Note 1 1 for additional details regarding the Company’s retirement and employee benefit plans. 

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Measurements [Abstract]
Fair Value Measurements	( 8 ) FAIR VALU E MEASUREMENTS  The carrying amounts and estimated fair values of the Company’s financial instruments as of March 31 , 201 7 and December 31, 201 6 were as follows:    March 31, 2017 December 31, 2016  Carrying Fair Carrying Fair  Amount Value Amount Value  (in millions)  Cash and cash equivalents $ 1,382 $ 1,382 $ 1,423 $ 1,423  Credit facility – – – –  Term loan facility due December 2020 (1) 327 327 327 327  Term loan facility due December 2020 (1) 1,191 1,191 1,191 1,191  Senior notes 3,141 3,088 3,166 3,182  Derivative instruments, net (2) (229) (229) (375) (375)  (1) The maturity date will accelerate to October 2019 if, by that date, the Company has not amended, redeemed or refinanced at least $765 million of its senior notes due in January 2020 . (2) Does not include $5 million in premiums paid related to certain call options currently recognized as a component of derivative assets within current assets on the unaudited condensed consolidated balance sheet.  The carrying values of cash and cash equivalents, accounts receivable, other current assets , accounts payable and other current liabilities on the unaudited condensed consolidated balance sheets approxim ate fair value because of their short-term nature. For debt and derivative instruments, the following methods and assumptions were used to estimate fair value:  Debt: The fair values of the Company’s senior notes were based on the market value of the Company’s publicly traded debt as determined based on the yield of the Company’s senior notes.   The carrying values of the borrowings under the Company’s term loan facilities and unsecured revolving credit facility approximate fair value because the interest rate is variable and reflective of market rates. The Company considers the fair value of its debt to be a Level 2 measurement on the fair value hierarchy.  Derivative Instruments: The fair value of all derivative instruments is the amount at which the instrument could be exchanged currently between willing parties. The amounts are based on quoted market prices, best estimates obtained from counterparties and an option pricing model, when necessary, for price option contracts.  The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value. As presented in the tables below, this hierarchy consists of three broad levels:  Level 1 valuations - Consist of unadjusted quoted prices in active markets for identical assets and liabilities and have the highest priority .  Level 2 valuations - Consist of quoted market information for the ca lculation of fair market value.  Level 3 valuations - Consist of internal estimates and have the lowest priority.  The Company has classified its derivatives into these levels depending upon the data utilized to determine their fair values. The Company’s fixed price swaps (Level 2) are estimated using third-party discounted cash flow calculations using the NYMEX futures index. The Company utilized discounted cash flow models for valuing its interest rate derivatives (Level 2). The net derivative val ues attributable to the Company’ s interest rate derivative contracts as of March 31, 2017 are based on (i) the contracted notional amounts, (ii) active market-quoted London Interbank Offered Rate (“LIBOR”) yield curves and (iii) the applicable credit-adjusted risk-free rate yield curve. The Company’s call options, purchased put options, two-way costless collars and three-way costless collars (Level 3) are valued using the Black-Scholes model, an industry standard option valuation model that takes into account inputs such as contract terms, including maturity, and market parameters, including assumptions of the NYMEX futures index, interest rates, volatility and credit worthiness. The Company’s basis swaps (Level 3) are estimated using third-party calculations based upon forward commodity price curves.  Inputs to the Black-Scholes model, including the volatility input, which is the significant unobservable input for Level 3 fair value measurements, are obtained from a third-party pricing source, with independent verification of the most significant inputs on a monthly basis. An increase (decrease) in volatility would result in an increase (decrease) in fair value measurement, respectively.  Assets and liabilities measured at fair value on a recurring basis are summarized below (in millions):      March 31, 2017  Fair Value Measurements Using:  Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets (Liabilities) at Fair Value  Fixed price swap assets $ – $ 9 $ – $ 9  Two-way costless collars assets – – 11 11  Three-way costless collars assets – – 143 143  Basis swap assets – – 2 2  Call option assets (1) – – 15 15  Fixed price swap liabilities – (68) – (68)  Two-way costless collars liabilities – – (28) (28)  Three-way costless collars liabilities – – (167) (167)  Basis swap liabilities – – (90) (90)  Call option liabilities – – (54) (54)  Interest rate swap liabilities – (2) – (2)  Total $ – $ (61) $ (168) $ (229)  (1) Does not include $5 million in premiums paid related to certain call options currently recognized as a component of derivative assets within current assets on the unaudited condensed consolidated balance sheet.     December 31, 2016  Fair Value Measurements Using:  Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets (Liabilities) at Fair Value  Fixed price swap assets $ – $ 1 $ – $ 1  Two-way costless collars assets – – 10 10  Three-way costless collars assets – – 111 111  Basis swap assets – – 33 33  Fixed price swap liabilities – (178) – (178)  Two-way costless collars liabilities – – (58) (58)  Three-way costless collars liabilities – – (192) (192)  Basis swap liabilities – – (18) (18)  Call option liabilities – – (81) (81)  Interest rate swap liabilities – (3) – (3)  Total $ – $ (180) $ (195) $ (375)  The table below presents reconciliations for the change in net fair value of derivative assets and liabilities measured at fair value on a recurring basis using significant unobse rvable inputs (Level 3) for the three months ended March 31 , 201 7 and 201 6 . The fair values of Level 3 derivative instruments are estimated using proprietary valuation models that utilize both market observable and unobservable parameters. Level 3 instruments presented in the table consist of net derivatives valued using pricing models incorporating assumptions that, in the Company’s judgment, reflect reasonable assumptions a marketplace partic ipant would have used as of March 31 , 201 7 and 201 6 .             For the three months ended  March 31,  2017 2016  (in millions)  Balance at beginning of period $ (195) $ 3  Total gains (losses):  Included in earnings 13 (34)  Settlements 14 (4)  Transfers into/out of Level 3 – –  Balance at end of period $ (168) $ (35)  Change in gains (losses) included in earnings relating to derivatives still held as of March 31 $ 27 $ (38) 

Debt

Debt	3 Months Ended
	Mar. 31, 2017
Debt [Abstract]
Debt	( 9 ) D EBT  The c omponents of debt as of March 31 , 201 7 and December 31, 201 6 consisted of the following:      March 31, 2017  Debt Instrument Unamortized Issuance Expense Unamortized Debt Discount Total  (in millions)  Short-term debt:  7.35% Senior Notes due October 2017 $ 15 $ – $ – $ 15  7.125% Senior Notes due October 2017 25 – – 25  3.30% Senior Notes due January 2018 (1) 38 – – 38  7.50% Senior Notes due February 2018 (2) 187 – – 187  7.15% Senior Notes due June 2018 1 – – 1  Total short-term debt $ 266 $ – $ – $ 266   Long-term debt:  Variable rate ( 3.450% at March 31, 2017) term loan facility, due December 2020 (3) 327 (2) – 325  Variable rate ( 3.450% at March 31, 2017) term loan facility, due December 2020 (3) 1,191 (10) – 1,181  7.15% Senior Notes due June 2018 25 – – 25  4.05% Senior Notes due January 2020 (1) 850 (4) – 846  4.10% Senior Notes due March 2022 1,000 (4) (1) 995  4.95% Senior Notes due January 2025 (1) 1,000 (6) (2) 992  Total long-term debt $ 4,393 $ (26) $ (3) $ 4,364   Total debt $ 4,659 $ (26) $ (3) $ 4,630     December 31, 2016  Debt Instrument Unamortized Issuance Expense Unamortized Debt Discount Total  (in millions)  Short-term debt:  7.35% Senior Notes due October 2017 $ 15 $ – $ – $ 15  7.125% Senior Notes due October 2017 25 – – 25  7.15% Senior Notes due June 2018 1 – – 1  Total short-term debt $ 41 $ – $ – $ 41   Long-term debt:  Variable rate ( 3.220% at December 31, 2016) term loan facility, due December 2020 (3) 327 (2) – 325  Variable rate ( 3.220% at December 31, 2016) term loan facility, due December 2020 (3) 1,191 (10) – 1,181  3.30% Senior Notes due January 2018 (1) 38 – – 38  7.5 0% Senior Notes due February 2018 212 – – 212  7.15% Senior Notes due June 2018 25 – – 25  4.05% Senior Notes due January 2020 (1) 850 (5) – 845  4.10% Senior Notes due March 2022 1,000 (4) (1) 995  4.95% Senior Notes due January 2025 (1) 1,000 (7) (2) 991  Total long-term debt $ 4,643 $ (28) $ (3) $ 4,612   Total debt $ 4,684 $ (28) $ (3) $ 4,653  (1) In February and June 2016, Moody’s and S&P downgraded certain senior notes, increasing the interest rates by 175 basis points effective July 2016. As a result of the downgrades, interest rates increased to 5.05% for the 2018 Notes, 5.80% for the 2020 Notes and 6.70% for the 2025 Notes.  (2) In March 2017, the Company repurchased $25 million of its 7.50% Senior Notes due February 2018 and recognized a $1 million loss on the extinguishment of debt.  (3) The maturity date will accelerate to October 2019 if, by that date, the Company has not amended, redeemed or refinanced at least $765 million of its senior notes due in January 2020 .  2016 Credit Facility  In June 2016, the Company reduced its existing $2.0 billion unsecured revolving credit facility to $66 million and entered into a new credit agreement for $1,934 million, consisting of a $1,191 million secured term loan and a new $743 million unsecured revolving credit facility, which matures in December 2020 . The maturity date will accelerate to October 2019 if, by that date, the Company has not amended, redeemed or refinanced at least $765 million of its senior notes due January 2020. The $1,191 million secured term loan is fully drawn, with approximately $285 million of this balance used to pay down the previous revolving credit facility bala nce in its entirety. As of March 31 , 201 7 , there were no borrowings under either revolving credit facilit y; however, $327 million in letters of credit was outstanding against the 2016 revolving credit facility.  Loans under the 2016 credit agreement are subject to varying rates of interest based on whether the loan is a Eurodollar loan or an alternate base rate loan. Eurodollar loans bear interest at the Eurodollar rate, which is adjusted LIBOR plus applicable margins ranging from 1.750% to 2.500% . Alternate base rate loans bear interest at the alternate base rate plus the applicable margin ranging from 0.750% to 1.500% . The interest rate on the term loan facility is determined based upon the Company’s public debt ratings and was 250 basis points over LIBOR as of March 31, 2017.  The new term loan and revolving credit facility contain financial covenants that impose certain restrictions on the Company. Under the new credit agreement, the Company must maintain a minimum interest coverage of 1.00x in 2017, increasing by 0.25x increments per year to 1.50x in 2019 and 2020 . The Company is also subject to a minimum liquidity requirement of $300 million, which could be increased up to $500 million upon certain conditions, as well as an anti-hoarding provision, requiring unrestricted cash in excess of $100 million to pay down any amounts borrowed under the new revolving credit facility. The financial covenant with respect to minimum interest coverage consists of EBITDAX divided by consolidated interest expense. EBITDAX, as defined in our 2016 credit agreement, excludes the effects of interest expense, income taxes, depreciation, depletion and amortization, any non-cash impacts from impairments, certain non-cash hedging activities, stock-based compensation expense, non-cash gains or losses on asset sales, unamortized issuance cost, unamortized debt discount and certain restructuring costs. Colla teral for the new secured term loan is principally the Company’s E&P properties in the Fayetteville Shale area, the equity of its subsidiaries and cash and marketable securities on hand, and the new credit agreement requires a minimum collateral coverage ratio of 1.50x for the 2016 secured term loan. This collateral also may support all or a part of revolving credit extensions depending on restrictions in the Company’s senior notes indentures.  A s of March 31, 2017 , the Company was in compliance with all of the covenants of this credit agreement. Although the Company does not anticipate any violations of the financial covenants, its ability to comply with these covenants is dependent upon the success of its exploration and development program and upon factors beyond the Company’s control, such as the market prices for natural gas, oil and NGLs.  2013 Credit Facility  In December 2013, the Company entered into a credit agreement that exchanged its previous revolving credit facility. Under the revolving credit facility, the Company had a borrowing capacity of $2.0 billion. The revolving credit facility was unsecured and was not guaranteed by any subsidiaries. On March 30, 2016, the Company borrowed $1.55 billion on the revolving credit facility with the proceeds invested in marketable securities. The $1.55 billion borrowing was repaid on April 1, 2016. In June 2016, this credit facility was substantially exchanged for a new credit facility comprised of a $1,191 m illion secured term loan and a new $743 m illion revolving credit facility. The borrowing capacity of the original 2013 credit agreement was reduced from $2.0 billion to $66 million , remains unsecured and the maturity remain s December 2018 . As of March 31 , 201 7 , there were no borrowings under this facility.  The existing unsecured 2013 revolving credit facility includes a financial covenant under which the Company may not have total debt in excess of 60% of its total adjusted book capital. This financial covenant with respect to capitalization perc entages excludes the effects of any full cost ceiling impairments, certain hedging activities and the Company’s pension and other postretirement liabilities. At March 31, 2017, debt constituted 34% of the Company’s adjusted book capital .  2015 Term Facility  In November 2015, the Company entered into a $750 million unsecured three -year term loan credit agreement with various lenders that was utilized to repay borrowings under the revolving credit facility. The interest rate on the term loan facility is determined based upon the Company’s public debt ratings from Moody’s and S&P and was 250 basis points over LIBOR as of March 31, 2017. The term loan facility requires prepayment unde r certain circumstances from the net cash proceeds of sales of equity or certain assets and borrowings outside the ordinary course of business. In June 2016, this term loan agreement was amended to extend the maturity date upon a repayment threshold. From the net proceeds of the July 2016 equity offering, the Company repaid $375 million of the $750 million unsecured term loan, which had the effect of extending the term loan maturity from November 2018 to December 2020 , which will accelerate to October 2019 if, by that date, the Company has not amended, redeemed or refinanced at least $765 million of its senior notes due in January 2020 . In September 2016, the Company repaid a n additional $48 million from the proceeds received from the closing of the sale of approximately 55,000 net acres in West Virginia .  Senior Notes  In January 2015, the Company completed a public offering of $350 million aggregate principal amount of its 3.30% senior notes due 2018 (the “2018 Notes”), $850 million aggregate principal amount of its 4.05% senior notes due 2020 (the “2020 Notes”) and $1.0 billion aggregate principal amount of its 4.95% senior notes due 2025 (the “2025 Notes” together with the 2018 and 2020 Notes, the “Notes”), with net proceeds from the offering totaling approximately $2.2 billion after underwriting discounts and offering expenses. The Notes were sold to the public at a price of 99.949% of their face value for the 2018 Notes, 99.897% of their face value for the 2020 Notes and 99.782% of their face value for the 2025 Notes. The interest rates on the Notes are determined based upon the public bond ratings from Moody’s and S&P. Downgrades on the Notes from either rating agency increase interest costs by 25 basis points per downgrade level and upgrades decrease interest costs by 25 basis points per upgrade level , up to the stated coupon rate, on the following semi-annual bond interest payment. In February and June 2016, Moody’s and S&P downgraded the Notes, increasing the interest rates by 175 basis points effective July 2016. As a result of these downgrades, interest rates increased to 5.05% for the 2018 Notes, 5.80% for the 2020 Notes and 6.70% for the 2025 Notes. In the event of future downgrades, the coupons for this series of notes are capped at 5.30% , 6.05% and 6.95% , respectively. T he first coupon payment at the higher interest rate s was paid in J anuary 201 7.  In July 2016 , the Company used a portion of the proceeds from the July 2016 equity offering to settle certain tender offer s by purchasing an aggregate principal amount of approximately $700 million of its outstanding senior notes due in the first quarter of 2018. 

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments And Contingencies [Abstract]
Commitments And Contingencies	(1 0 ) COMMIT MENTS AND CONTINGENCIES  Operating Commitments and Contingencies  As of March 31, 2017, the Company’s contractual obligations for demand and similar charges under firm transportation and gathering agreements to guarantee access capacity on natural gas and liquids pipelines and gathering systems totaled approximately $ 8.7 billion , $ 3.7 billion of which related to access capacity on future pipeline and gathering infrastructure projects that still require the granting of regulatory approvals and additional construction efforts. The Company also had guarantee obligations of up to $ 821 million of that amount. As of March 31 , 201 7 , future payments under non-cancelable firm transportation and gathering agreements are as follows:      Payments Due by Period  Total Less than 1 Year 1 to 3 Years 3 to 5 Years 5 to 8 Years More than 8 Years  (in millions)  Infrastructure currently in service $ 5,011 $ 592 $ 1,139 $ 791 $ 832 $ 1,657  Pending regulatory approval and/or construction (1) 3,661 35 371 474 730 2,051  Total transportation charges $ 8,672 $ 627 $ 1,510 $ 1,265 $ 1,562 $ 3,708  (1) Based on the estim ated in-service dates as of March 3 1 , 201 7 .  Environ mental Risk  The Company is subject to laws and regulations relating to the protection of the environment. Environmental and cleanup related costs of a non-capital nature are accrued when it is both probable that a liability has been incurred and when the amount can be reasonably estimated. Management believes any future remediation or other compliance related costs will not have a material effect on the financial position or results of operations of the Company.  Litiga tion  The Company is subject to various litigation, claims and proceedings that have arisen in the ordinary course of business, such as for alleged breaches of contract, miscalculation of royalties and pollution, contamination or nuisance. The Company accrues for such items when a liability is both probable and the amount can be reasonably estimated. Management believes that current litigation, claims and proceedings, individually or in aggregate and after taking into account insurance, are not likely to have a material adverse impact on the Company’s financial position, results of operations or cash flows , although it is possible that adverse outcomes could have a material adverse effect on the Company’s results of operations or cash flows for the period in which the effect of that outcome becomes reasonably estimable. Many of these matters are in early stages, so the allegations and the damage theories have not been fully developed, and are all subject to inhe rent uncertainties; therefore, m anagement’s vie w may change in the future.  Arkansas Royalty Litigation  Certain of the Company’s subsidiaries are defendants in three cases, two filed in Arkansas state court in 2010 and 2013 and one in federal court in 2014, on behalf of putative classes of royalty owners on some of the Company’s leases located in Arkansas. The chief complaint in all three cases is that one of the Company’s subsidiaries underpaid the royalty owners by, among other things, deducting from royalty payments costs for gathering, transportation, and compression of natural gas in excess of what is permitted by the relevant leases. In September and October 2014, the judges in the two Arkansas state actions entered orders certifying classes of royalty owners who are citizens of Arkansas.  In November 2015, the court in the federal case denied the plaintiff’s motion to certify a class of royalty owners not included in either of the two state cases. In April 2016, the court certified a broader class that includes Arkansas residents and citizens . Class members were notified of the pending action in late 2016, and the period to “opt out” of the class has expired. The plaintiff in the federal case presented two alternative damages theories. Under one theory, plaintiffs have asserted that obligations to affiliates are not “incurred” and therefore the exploration and production subsidiary was not entitled to deduct any post-production costs; the federal court has granted partial summary judgment for the Company’s subsidiaries on this theory. Under another theory, plaintiffs assert that the gathering and treating rates the Company deducted from royalty payments exceeded the affiliates’ actual costs or otherwise were not reasonable. The class representative’s expert’s report alleges class-wide damages in this case of approximately $98 million, before interest and statutory amounts. The class is also seeking punitive damages. The Company moved for summary judgment on all claims. The court granted the motion in part and denied it in part and has set a trial date in the second quarter of 2017.  The Company’s subsidiaries appealed the class certification order in the state cases. In December 2016, the Arkansas Supreme Court affirmed the certifications. These cases are now before the Arkansas trial judges. The precise configuration of the classes has not been determined, particularly in light of the overlapping composition of the class in the federal case. One of the state cases has been set for trial in the third quarter of 2017. No date for trial has been set in the other state case.  In addition, in September 2015 three cases were filed in Arkansas state court on behalf of a total of 248 individually named plaintiffs. Each case asserts complaints that are in substance virtually identical to the above-described case. The Company and its subsidiaries have removed two of the cases to federal court, and those cases have been assigned to the court in which the above-described federal case is pending. All three cases have been stayed.  Management believes that, in all of the above cases, the deductions from royalty payments as calculated are permitted and is vigorously defending the cases. The Company’s assessment may change in the future due to the occurrence of certain events, such as adverse judgments, and such a re-assessment could lead to the determination that the potential liability is probable and could be material to the Company’s results of operations, financial position or cash flows.  Indemnifications  The Company provides certain indemnifications in relation to dispositions of assets. These indemnifications typically relate to disputes, litigation or tax matters existing at the date of disposition. No liability has been recognized in connection with these indemnifications. 

Pension Plan And Other Postreti

Pension Plan And Other Postretirement Benefits	3 Months Ended
	Mar. 31, 2017
Pension Plan And Other Postretirement Benefits [Abstract]
Pension Plan And Other Postretirement Benefits	(1 1 ) PENSION PLAN AND OTHER POSTRETIREMENT BENEFITS  The Company has defined pension and postretirement benefit plans which cover substantially all of the Company’s employees. Net periodic pension costs include the following components for the three months ended March 31, 2017 and 2016 :    Pension Benefits  For the three months ended  March 31,  2017 2016  (in millions)  Service cost $ 2 $ 4  Interest cost 1 2  Expected return on plan assets (1) (2)  Amortization of prior service cost – –  Amortization of net loss 1 –  Net periodic benefit cost $ 3 $ 4  The Company’s other postretirement benefit plan had a net periodic benefit cost of $1 million for the three months ended March 31 , 201 7 and 2016 .  As of March 31 , 201 7 , the Company has contributed $5 million to the pension and other postretirement benefit plan s in 2017. The Company expects to contribute an additional $9 million to its pension plan during the remainder of 2017. The Company recognized a liability of $34 million and $13 million related to its pension and other postretirement be nefits, respectively, as of March 31 , 201 7, compared to a liability of $36 million and $13 million as of December 31, 2016. The Company used an assumption of 4.60% during the first quarter of 2016 for both the pension and other postretirement benefit plans. In January 2016, the Company initiated a reduction in workforce that was substantially completed by the end of the first quarter of 2016. The impact of the workforce reduction on the Company’s pension and other postretirement benefit costs was not recognized until subsequent quarters in 2016 due to the delayed timing of actuarial data available. The Company updated the discount rate currently used in the measurement of the benefit obligation of the pension plan and other postretirement benefits plan to 4.20% in the second quarter of 2016.  The Company maintains a non-qualified deferred compensation supplemental retirement savings plan (“Non-Qualified Plan”) for certain key employees who may elect to defer and contribute a portion of their compensation, as permitted by the plan. Shares of the Company’s common stock purchased under the terms of the Non-Qualified Plan are presented as treasury stock and totaled 11,686 shares at March 31 , 201 7, compared to 31,269 s hares at December 31, 2016 . 

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2017
Stock-Based Compensation [Abstract]
Stock-Based Compensation	(1 2 ) STOCK-BASE D COMPENSATION  The Company recognized the following amounts in employee stock-based compensation costs for the three months ended March 31, 2017 and 201 6 :     For the three months ended  March 31,  2017 2016  (in millions)  Stock-based compensation cost – expensed (1) $ 6 $ 23  Stock-based compensation cost – capitalized $ 4 $ 3  (1) Includes $18 million related to the reduction in workforce for the three months ended March 31 , 2016.  In January 2016, the Company announced a 40% workforce reduction that was substantially completed by the end of March 2016. In April 2016, the Company also partially restructured executive management, which was substantially completed in the second quarter of 2016. Affected employees were offered a severance package that included, if applicable, amendments to certain outstanding equity awards that modified forfeiture provisions on separation from the Company. As a result, certain unvested stock-based equity awards became fully vested at the time of separation. These shares were revalued and recognized immediately as a component of restructuring charges on the Company’s unaudited condensed consolidated statements of operations. The unvested portion of equity-based performance units was forfeited upon separation from the Company.  As of March 31, 2017, there was $ 96 million of total unrecognized compensation cost related to the Company’s unvested stock option grants, restricted stock grants and performance units. This cost is expected to be recognized over a weighted-average period of 3 y ears .  Stock Options  The following table summarizes s tock option activity for the three months ended March 31, 2017 and provides information for options outstanding an d options exercisable as of March 31, 2017 :    Number Weighted Average  of Options Exercise Price  (in thousands) (per share)  Outstanding at December 31, 2016 5,416 $ 23.46  Granted 1,322 8.59  Exercised – –  Forfeited or expired (17) 45.57  Outstanding at March 31, 2017 6,721 20.48  Exercisable at March 31, 2017 3,537 $ 29.34  Restricted Stock  The following table summarizes restr icted stock activity for the three months ended March 31, 2017 and provides information for unvested shares as of March 31, 2017 :    Number Weighted Average  of Shares Fair Value  (in thousands) (per share)  Unvested shares at December 31, 2016 3,321 $ 11.85  Granted 4,549 8.59  Vested (70) 13.45  Forfeited (113) 10.05  Unvested shares at March 31, 2017 7,687 $ 9.93  Equity-Classified Performance Units  The following table summarizes performance unit activity for the three months ended March 31, 2017 to be paid out in Company stock and provides information for unvested units as o f March 31, 2017. The performance units awarded in 2013 and 2014 inclu ded a market condition based on r elative Total Shareholder Return (“TSR”) and a performance condition based on the Company's Present Value Index (“PVI”), collectively the “Performance Measures .” The fair value of the TSR market condition is based on a Monte Carlo model and is amortized to compensation expense on a straight-line basis over the vesting period of the award. The fair value of the PVI performance condition is based on economic analysis for each investment opportunity based upon the expected present value added for each dollar to be invested and amortized to com pensation expense on a straight line basis over the vesting period of the award. The performance unit awards granted in 2015, 2016 and during the first quarter of 2017 are based exclusively on TSR. The grant date fair value is calculated using the applicable Performance Measures and the closing price of the Company’s common stock at the grant date.     Number Weighted Average  of Units (1) Fair Value  (in thousands) (per share)  Unvested units at December 31, 2016 719 $ 11.46  Granted 1,197 10.47  Vested – –  Forfeited – –  Unvested units at March 31, 2017 1,916 $ 10.84  (1) These amounts reflect the number of performance units granted in thousands. The actual payout of shares may range from a minimum of zero shares to a maximum of two shares contingent upon the actual performance against the Performance Measures. The performance units have a three -year vesting term and the actual disbursement of shares, if any, is determined during the first quarter following the end of the three-year vesting period. Liability-Classified Performance Units  Prior to 2013, c ertain employees were provided performance units vesting equally over three yea rs, payable in cash. The payout of these units wa s based on certain metrics, such as total shareholder return and reserve replacement efficiency, compared to a predetermined group of peer companies and Company goal s . At the end of each performance period, the value of the vest ed performance units, if any, would be paid in cash. In the first quarter of 2016, the Company completed the final payout under these performance unit agreements . 

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2017
Segment Information [Abstract]
Segment Information	(1 3 ) SEGM ENT INFORMATION  The Company’s reportable business segments have been identified based on the differences in products or services provided. Revenues for the E&P segment are derived from the production and sale of natural gas and liquids. The Midstream Services segment generates revenue through the marketing of both Company and third-party produced natural gas and liquids volumes and through gathering fees associated with the transportation of natural gas to market.  Summarized financial information for the Company’s reportable segments is shown in the following table. The accounting policies of the segments are the same as those described in Note 1 of the Notes to Consolidated Financial Statements included in Item 8 of the 201 6 Annual Report. Management evaluates the performance of its segments based on operating income, defined as operating revenues less operating costs. Income before income taxes, for the purpose of reconciling the operating income amount shown below to consolidated income before income taxes, is the sum of oper ating income, interest expense, gain (loss) on derivatives and other income (loss ). The “Other” column includes items not related to the Company’s reportable segments , including real estate and corporate items.      Exploration and Production Midstream Services Other Total  (in millions)  Three months ended March 31, 2017:  Revenues from external customers $ 566 $ 280 $ – $ 846  Intersegment revenues (3) 578 – 575  Depreciation, depletion and amortization expense 90 16 – 106  Operating income 225 41 – 266  Interest expense (1) 32 – – 32  Gain on derivatives 116 – – 116  Loss on early extinguishment of debt – – (1) (1)  Other income, net 2 – – 2  Assets 4,413 1,268 1,515 (2) 7,196  Capital investments (3) 283 6 1 290   Three months ended March 31, 2016:  Revenues from external customers $ 343 $ 236 $ – $ 579  Intersegment revenues (7) 385 – 378  Depreciation, depletion and amortization expense 127 16 – 143  Impairment of natural gas and oil properties 1,034 – – 1,034  Operating income (loss) (1,160) (4) 60 (5) – (1,100)  Interest expense (1) 14 – – 14  Loss on derivatives (13) (1) – (14)  Other loss, net (2) (1) – (3)  Provision for income taxes (1) 1 – – 1  Assets 5,538 1,220 1,760 (2) 8,518  Capital investments (3) 120 2 – 122  (1) Interest expense and the provision for income taxes by segment are an allocation of corporate amounts as they are incurred at the corporate level. (2) Other assets represent corporate assets not allocated to segments and assets for non-reportable segments. At March 31, 2017 and 2016, other assets includes approximately $1.4 billion and $1.6 billion in cash and cash equivalents, respectively. (3) Capital investments includes decreases of $52 million and $78 million for the three months ended March 31, 2017 and 2016 , respectively, relating to the change in accrued expenditures between periods. (4) Operating income (loss) for the E&P segment includes $61 million related to restructuring charges for the three months ended March 31, 2016. (5) Operating income (loss) for the Midstream segment includes $3 million related to restructuring charges for the three months ended March 31, 2016.  Included in intersegment revenues of the Midstream Services segment are $ 524 million and $ 319 million for the three months ended March 31 , 201 7 and 201 6 , respectively , for marketing of the Company’s E&P sales. Corporate assets include cash and cash equivalents, furniture and fixtures and other costs. Corporate general and administrative costs, depreciation expense and taxes other than income are allocated to the segments. 

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2017
Income Taxes [Abstract]
Income Taxes	(14) INCOME TAXES  The Company’s effective tax rate was approximately 0% for the three months ended March 31 , 201 7 and 2016 , primarily as a result of the recognition of a valuation allowance. A valuation allowance for deferred tax assets, including net operating losses, is recognized when it is more likely than not that some or all of the benefit from the deferred tax asset will not be realized. To assess that likelihood, the Company uses estimates and judgment regarding future taxable income, and considers the tax consequences in the jurisdiction where such taxable income is generated, to determine whether a valuation allowance is required. Such evidence can include current financial position, results of operations, both actual and forecasted, the reversal of deferred tax liabilities, and tax planning strategies as well as the current and forecasted business economic s of the oil and gas industry.  T he Company maintained its net deferred tax asset po sition at March 31, 2017 primarily d ue to the write-downs of the carrying value of natural gas and oil properties in 2015 and 2016 . The Company recorded a $75 m illion decrease in our valuation allowance for the three months ended March 31, 2017 and a $431 million increase in our valuation allowance for the three months ended March 31, 2016 . Management assesses the available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit the use of deferred tax assets. In management’s view, the cumulative loss incurred over recent years outweighs any positive factors, such as the possibility of future growth. The amount of the deferred tax asset considered realizable, however, could be adjusted if estimates of future taxable income are increased or if objective negative evidence in the form of cumulative losses is no longer present and additional weight is given to subjective evidence such as future expected growth. 

New Accounting Pronouncements

New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2017
New Accounting Pronouncements [Abstract]
New Accounting Pronouncements	(1 5 ) NEW ACCOUNTI NG PRONOUNCEMENTS  New Accounting Standards Implemented  In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) (“Update 2016-09”), to simplify accounting for share-based payment transactions including income tax consequences, classification of awards as either equity or liabilities, and the classification on the statement of cash flows. For public entities, Update 2016-09 became effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years, with early adoption permitted. The Company adopted Update 2016-09 during the first quarter with an effective date of January 1, 2017. The recognition of previously unrecognized windfall tax benefits resulted in a net cumulative-effect adjustment of $59 million, which increased net deferred tax assets and the related income tax valuation allowance by the same amount as of the beginning of 2017. The amendments within Update 2016-09 related to the recognition of excess tax benefits and tax shortfalls in the income statement and presentation within the operating section of the statement of cash flows were adopted prospectively, with no adjustments made to prior periods. The Company has elected to account for forfeitures as they occur. The remaining provisions of this amendment did not have a material effect on its unaudited condensed consolidated results of operations, financial position or cash flows.  New Accounting Standards Not Yet Implemented  In August 2016, the FASB issued Accounting Standards Update No. 2016-15, Statement of Cash Flows (Topic 230) (“Update 2016-15”), which seeks to reduce the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. For public entities, Update 2016-15 becomes effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the provisions of Update 2016-15 and assessing the impact, if any, it may have on its consolidated results of operations, financial position or cash flows.  In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases (Topic 842) (“Update 2016-02”), which seeks to increase transparency and comparability among organizations by, among other things, recognizing lease assets and lease liabilities on the balance sheet for leases classified as operating leases under previous GAAP and disclosing key information about leasing arrangements. Through March 2017, the Company made progress on contract reviews, drafting its accounting policies and evaluating the new disclosure requirements. The Company will continue assessing the effect that the updated standard may have on its consolidated financial statements and related disclosures, and anticipates that its assessment will be complete in 2018. For public entities, Update 2016-02 becomes effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted.  In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“Update 2014-09”), which seeks to provide clarity for recognizing revenue. The new standard removes inconsistencies in existing standards, changes the way companies recognize revenue from contracts with customers and increases disclosure requirements. The codification was amended through additional ASUs and, as amended, requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. The standard is required to be adopted using either the full retrospective approach, with all prior periods presented adjusted, or the modified retrospective approach, with a cumulative adjustment to retained earnings on the opening balance sheet. The Company has not yet selected a transition method. The Company has a team in place to analyze the impact of Update 2014-09, and the related ASU's, across all revenue streams to evaluate the impact of the new standard on revenue contracts. This includes reviewing current accounting policies and practices to identify potential differences that would result from applying the requirements under the new standard. Through March 2017, the Company made progress on contract reviews, drafting its accounting policies and evaluating the new disclosure requirements. The Company expects to complete its evaluations of the impacts of the accounting and disclosure requirements on its business processes, controls and systems in the second half of 2017. For public entities, the new standard is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period.

Cash And Cash Equivalents (Tabl

Cash And Cash Equivalents (Tables)	3 Months Ended
	Mar. 31, 2017
Cash And Cash Equivalents [Abstract]
Summary Of Cash And Cash Equivalents	  March 31 , December 31,  201 7 201 6  (in millions)   Cash $ 265 $ 254  Marketable securities (1) 1,117 1,169  Total cash and cash equivalents $ 1,382 $ 1,423  (1) Consists of government stable value money market funds .

Reduction In Workforce (Tables)

Reduction In Workforce (Tables)	3 Months Ended
	Mar. 31, 2017
Reduction In Workforce [Abstract]
Summary Of Restructuring Charges	  For the three months ended  March 31, 2016  (in millions)  Severance (including payroll taxes) $ 42  Stock-based compensation 18  Pension and other postretirement benefits 3  Outplacement services, other 1  Total restructuring charges (1) $ 64  (1) Total restructuring charges were $61 million and $3 million for the Company’s E&P and Midstream Services segments, respectively.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share	  For the three months ended March 31,  2017 2016  (in millions, except share/per share amounts)  Net income (loss) $ 351 $ (1,132)  Mandatory convertible preferred stock dividend 27 27  Participating securities - mandatory convertible preferred stock 43 –  Net income (loss) attributable to common stock $ 281 $ (1,159)   Number of common shares:  Weighted average outstanding 493,068,000 382,870,847  Issued upon assumed exercise of outstanding stock options 82,845 –  Effect of issuance of non-vested restricted common stock 770,429 –  Effect of issuance of non-vested performance units 573,721 –  Effect of issuance of mandatory convertible preferred stock – –  Weighted average and potential dilutive outstanding 494,494,995 382,870,847   Earnings (Loss) per common share:  Basic $ 0.57 $ (3.03)  Diluted $ 0.57 $ (3.03) 
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share	  For the three months ended March 31,  2017 2016  Unvested stock options 1,854,004 5,732,521  Unvested share-based payment 1,212,396 5,779,820  Performance units – 297,297  Mandatory convertible preferred stock 74,999,895 74,999,895  Total 78,066,295 86,809,533 

Derivatives And Risk Manageme28

Derivatives And Risk Management (Tables)	3 Months Ended
	Mar. 31, 2017
Derivatives And Risk Management [Abstract]
Schedule Of Derivative Instruments, Notional Amount In BCF, Weighted Average Contract Prices And Fair Value	  Weighted Average Price per MMBtu  Volume (Bcf) Swaps Sold Puts Purchased Puts Sold Calls Basis Differential Fair value at March 31, 2017 (in millions)  Financial protection on production  2017  Fixed price swaps 262 $ 3.07 $ – $ – $ – $ – $ (58)  Two-way costless-collars 65 – – 2.92 3.34 – (11)  Three-way costless-collars 102 – 2.29 2.97 3.30 – (16)  Basis swaps 138 – – – – (1.04) (73)  Total 567 $ (158)  2018  Fixed price swaps 68 $ 3.02 $ – $ – $ – $ – $ (1)  Two-way costless-collars 23 – – 2.97 3.56 – (6)  Three-way costless-collars 245 – 2.39 2.97 3.37 – (6)  Basis swaps 20 – – – – (0.95) (15)  Total 356 $ (28)  2019  Three-way costless-collars 99 $ – $ 2.50 $ 2.95 $ 3.31 $ – $ (2)  Total 99 $ (2)     Weighted Average Price per MMBtu  Volume (Bcf) Sold Calls Fair value at March 31, 2017 (in millions)  Call options  2017 64 $ 3.54 $ (10) (1)  2018 63 3.50 (14)  2019 52 3.50 (10)  2020 32 3.75 (5)  Total 211 $ (39)  (1) Ex clude s $5 million in premiums paid related to certain call options recognized as a component of derivative assets within current assets on the unaudited condensed consolidated balance sheet. As certain call options settle, the premium will be amortized and recognized as a component of gain (loss) on derivatives on the unaudited condensed consolidated statement of operations.
Balance Sheet Classification Of Derivative Financial Instruments	  Derivative Assets  Balance Sheet Classification Fair Value  March 31, 2017 December 31, 2016  (in millions)  Derivatives not designated as hedging instruments:  Fixed price swaps Derivative assets $ 2 $ –  Two-way costless collars Derivative assets 11 8  Three-way costless collars Derivative assets 23 11  Basis swaps Derivative assets 2 32 Call options Derivative assets 15 –  Fixed price swaps Other long-term assets 7 1  Two-way costless collars Other long-term assets – 2  Three-way costless collars Other long-term assets 120 100  Basis swaps Other long-term assets – 1  Total derivative assets $ 180 (1) $ 155   Derivative Liabilities  Balance Sheet Classification Fair Value  March 31, 2017 December 31, 2016  (in millions)  Derivatives not designated as hedging instruments:  Fixed price swaps Derivative liabilities $ 68 $ 175  Two-way costless collars Derivative liabilities 28 49  Three-way costless collars Derivative liabilities 62 70  Basis swaps Derivative liabilities 89 13  Call options Derivative liabilities 32 46  Interest rate swaps Derivative liabilities 1 2  Fixed price swaps Other long-term liabilities – 3  Two-way costless collars Other long-term liabilities – 9  Three-way costless collars Other long-term liabilities 105 122  Basis swaps Other long-term liabilities 1 5  Call options Other long-term liabilities 22 35  Interest rate swaps Other long-term liabilities 1 1  Total derivative liabilities $ 409 $ 530  (1) Does not include $5 million in premiums paid related to certain call options currently recognized as a component of derivative assets within current assets on the unaudited condensed consolidated balance sheet. As certain call options settle, the premium will be amortized and recognized as a component of gain (loss) on derivatives on the unaudited condensed consolidated statement of operations.
Summary Of Before Tax Effect Of Fair Value Hedges Not Designated For Hedge Accounting	    Gain (Loss) on Derivatives, Unsettled  Recognized in Earnings  Consolidated Statement of Operations For the three months ended  Classification of Gain (Loss) March 31,  Derivative Instrument on Derivatives, Unsettled 2017 2016  (in millions)  Fixed price swaps Gain (Loss) on Derivatives $ 118 $ 20  Purchased put options Gain (Loss) on Derivatives – 15  Two-way costless-collars Gain (Loss) on Derivatives 31 –  Three-way costless- collars Gain (Loss) on Derivatives 57 –  Basis swaps Gain (Loss) on Derivatives (103) (3)  Call options Gain (Loss) on Derivatives 42 (50)  Interest rate swaps Gain (Loss) on Derivatives 1 (3)  Total gain (loss) on unsettled derivatives $ 146 $ (21)   Gain (Loss) on Derivatives, Settled (1)  Recognized in Earnings  Consolidated Statement of Operations For the three months ended  Classification of Gain (Loss) March 31,  Derivative Instrument on Derivatives, Settled 2017 2016  (in millions)  Fixed price swaps Gain (Loss) on Derivatives $ (16) $ 4  Two-way costless-collars Gain (Loss) on Derivatives (3) –  Three-way costless-collars Gain (Loss) on Derivatives (4) –  Basis swaps Gain (Loss) on Derivatives (1) 4  Call options Gain (Loss) on Derivatives (6) –  Interest rate swaps Gain (Loss) on Derivatives – (1)  Total gain (loss) on settled derivatives (2) $ (30) $ 7   Total gain (loss) on derivatives $ 116 $ (14)  (1) The Company calculates gain (loss) on derivatives, settled, as the summation of gains and losses on positions that have settled within the period. (2) Excluding interest rate swaps, these amounts are included, along with gas sales revenues, in the calculation of the Company’s realized natural gas price.

Reclassifications From Accumu29

Reclassifications From Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2017
Reclassifications From Accumulated Other Comprehensive Income (Loss) [Abstract]
Components Of Accumulated Other Comprehensive Income (Loss)	   March 31, 2017  Pension and Other Postretirement Foreign Currency Total  (in millions)  Beginning balance, December 31, 2016 $ (19) $ (20) $ (39)  Other comprehensive income (loss) before reclassifications – – –  Amounts reclassified from other comprehensive income (loss) (1) – – –  Net current-period other comprehensive income (loss) – – –  Ending balance, March 31, 2017 $ (19) $ (20) $ (39)   (1 ) See separate table below for details about these reclassifications . 
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss)	   Details about Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Operations Amount Reclassified from Accumulated Other Comprehensive Income  For the three months ended March 31, 2017  (in millions)  Pension and other postretirement:  Amortization of prior service cost and net loss (1) General and administrative expenses $ 1  Provision for income taxes 1  Net income (loss) $ –   Total reclassifications for the period Net income (loss) $ –  (1 ) See Note 1 1 for additional details regarding the Company’s retirement and employee benefit plans.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Measurements [Abstract]
Carrying Amount And Estimated Fair Values Of Financial Instruments	  March 31, 2017 December 31, 2016  Carrying Fair Carrying Fair  Amount Value Amount Value  (in millions)  Cash and cash equivalents $ 1,382 $ 1,382 $ 1,423 $ 1,423  Credit facility – – – –  Term loan facility due December 2020 (1) 327 327 327 327  Term loan facility due December 2020 (1) 1,191 1,191 1,191 1,191  Senior notes 3,141 3,088 3,166 3,182  Derivative instruments, net (2) (229) (229) (375) (375)  (1) The maturity date will accelerate to October 2019 if, by that date, the Company has not amended, redeemed or refinanced at least $765 million of its senior notes due in January 2020 . (2) Does not include $5 million in premiums paid related to certain call options currently recognized as a component of derivative assets within current assets on the unaudited condensed consolidated balance sheet.
Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis	   March 31, 2017  Fair Value Measurements Using:  Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets (Liabilities) at Fair Value  Fixed price swap assets $ – $ 9 $ – $ 9  Two-way costless collars assets – – 11 11  Three-way costless collars assets – – 143 143  Basis swap assets – – 2 2  Call option assets (1) – – 15 15  Fixed price swap liabilities – (68) – (68)  Two-way costless collars liabilities – – (28) (28)  Three-way costless collars liabilities – – (167) (167)  Basis swap liabilities – – (90) (90)  Call option liabilities – – (54) (54)  Interest rate swap liabilities – (2) – (2)  Total $ – $ (61) $ (168) $ (229)  (1) Does not include $5 million in premiums paid related to certain call options currently recognized as a component of derivative assets within current assets on the unaudited condensed consolidated balance sheet.     December 31, 2016  Fair Value Measurements Using:  Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets (Liabilities) at Fair Value  Fixed price swap assets $ – $ 1 $ – $ 1  Two-way costless collars assets – – 10 10  Three-way costless collars assets – – 111 111  Basis swap assets – – 33 33  Fixed price swap liabilities – (178) – (178)  Two-way costless collars liabilities – – (58) (58)  Three-way costless collars liabilities – – (192) (192)  Basis swap liabilities – – (18) (18)  Call option liabilities – – (81) (81)  Interest rate swap liabilities – (3) – (3)  Total $ – $ (180) $ (195) $ (375) 
Reconciliations For Change In Net Fair Value Of Derivative Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)	  For the three months ended  March 31,  2017 2016  (in millions)  Balance at beginning of period $ (195) $ 3  Total gains (losses):  Included in earnings 13 (34)  Settlements 14 (4)  Transfers into/out of Level 3 – –  Balance at end of period $ (168) $ (35)  Change in gains (losses) included in earnings relating to derivatives still held as of March 31 $ 27 $ (38) 

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2017
Debt [Abstract]
Components Of Debt	  March 31, 2017  Debt Instrument Unamortized Issuance Expense Unamortized Debt Discount Total  (in millions)  Short-term debt:  7.35% Senior Notes due October 2017 $ 15 $ – $ – $ 15  7.125% Senior Notes due October 2017 25 – – 25  3.30% Senior Notes due January 2018 (1) 38 – – 38  7.50% Senior Notes due February 2018 (2) 187 – – 187  7.15% Senior Notes due June 2018 1 – – 1  Total short-term debt $ 266 $ – $ – $ 266   Long-term debt:  Variable rate ( 3.450% at March 31, 2017) term loan facility, due December 2020 (3) 327 (2) – 325  Variable rate ( 3.450% at March 31, 2017) term loan facility, due December 2020 (3) 1,191 (10) – 1,181  7.15% Senior Notes due June 2018 25 – – 25  4.05% Senior Notes due January 2020 (1) 850 (4) – 846  4.10% Senior Notes due March 2022 1,000 (4) (1) 995  4.95% Senior Notes due January 2025 (1) 1,000 (6) (2) 992  Total long-term debt $ 4,393 $ (26) $ (3) $ 4,364   Total debt $ 4,659 $ (26) $ (3) $ 4,630     December 31, 2016  Debt Instrument Unamortized Issuance Expense Unamortized Debt Discount Total  (in millions)  Short-term debt:  7.35% Senior Notes due October 2017 $ 15 $ – $ – $ 15  7.125% Senior Notes due October 2017 25 – – 25  7.15% Senior Notes due June 2018 1 – – 1  Total short-term debt $ 41 $ – $ – $ 41   Long-term debt:  Variable rate ( 3.220% at December 31, 2016) term loan facility, due December 2020 (3) 327 (2) – 325  Variable rate ( 3.220% at December 31, 2016) term loan facility, due December 2020 (3) 1,191 (10) – 1,181  3.30% Senior Notes due January 2018 (1) 38 – – 38  7.5 0% Senior Notes due February 2018 212 – – 212  7.15% Senior Notes due June 2018 25 – – 25  4.05% Senior Notes due January 2020 (1) 850 (5) – 845  4.10% Senior Notes due March 2022 1,000 (4) (1) 995  4.95% Senior Notes due January 2025 (1) 1,000 (7) (2) 991  Total long-term debt $ 4,643 $ (28) $ (3) $ 4,612   Total debt $ 4,684 $ (28) $ (3) $ 4,653  (1) In February and June 2016, Moody’s and S&P downgraded certain senior notes, increasing the interest rates by 175 basis points effective July 2016. As a result of the downgrades, interest rates increased to 5.05% for the 2018 Notes, 5.80% for the 2020 Notes and 6.70% for the 2025 Notes.  (2) In March 2017, the Company repurchased $25 million of its 7.50% Senior Notes due February 2018 and recognized a $1 million loss on the extinguishment of debt.  (3) The maturity date will accelerate to October 2019 if, by that date, the Company has not amended, redeemed or refinanced at least $765 million of its senior notes due in January 2020 .

Commitments And Contingencies (

Commitments And Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments And Contingencies [Abstract]
Schedule Of Future Obligation Under Transportation Agreements	  Payments Due by Period  Total Less than 1 Year 1 to 3 Years 3 to 5 Years 5 to 8 Years More than 8 Years  (in millions)  Infrastructure currently in service $ 5,011 $ 592 $ 1,139 $ 791 $ 832 $ 1,657  Pending regulatory approval and/or construction (1) 3,661 35 371 474 730 2,051  Total transportation charges $ 8,672 $ 627 $ 1,510 $ 1,265 $ 1,562 $ 3,708  (1) Based on the estim ated in-service dates as of March 3 1 , 201 7 .

Pension Plan And Other Postre33

Pension Plan And Other Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2017
Pension Plan And Other Postretirement Benefits [Abstract]
Pension And Other Postretirement Benefit Costs	  Pension Benefits  For the three months ended  March 31,  2017 2016  (in millions)  Service cost $ 2 $ 4  Interest cost 1 2  Expected return on plan assets (1) (2)  Amortization of prior service cost – –  Amortization of net loss 1 –  Net periodic benefit cost $ 3 $ 4 

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2017
Stock-Based Compensation [Abstract]
Schedule Of Stock-Based Compensation Costs	  For the three months ended  March 31,  2017 2016  (in millions)  Stock-based compensation cost – expensed (1) $ 6 $ 23  Stock-based compensation cost – capitalized $ 4 $ 3  (1) Includes $18 million related to the reduction in workforce for the three months ended March 31 , 2016.
Summary Of Stock Option Activity	  Number Weighted Average  of Options Exercise Price  (in thousands) (per share)  Outstanding at December 31, 2016 5,416 $ 23.46  Granted 1,322 8.59  Exercised – –  Forfeited or expired (17) 45.57  Outstanding at March 31, 2017 6,721 20.48  Exercisable at March 31, 2017 3,537 $ 29.34 
Summary Of Restricted Stock Activity	  Number Weighted Average  of Shares Fair Value  (in thousands) (per share)  Unvested shares at December 31, 2016 3,321 $ 11.85  Granted 4,549 8.59  Vested (70) 13.45  Forfeited (113) 10.05  Unvested shares at March 31, 2017 7,687 $ 9.93 
Summary Of Performance Unit Activity	  Number Weighted Average  of Units (1) Fair Value  (in thousands) (per share)  Unvested units at December 31, 2016 719 $ 11.46  Granted 1,197 10.47  Vested – –  Forfeited – –  Unvested units at March 31, 2017 1,916 $ 10.84  (1) These amounts reflect the number of performance units granted in thousands. The actual payout of shares may range from a minimum of zero shares to a maximum of two shares contingent upon the actual performance against the Performance Measures. The performance units have a three -year vesting term and the actual disbursement of shares, if any, is determined during the first quarter following the end of the three-year vesting period.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Information [Abstract]
Summary Financial Information For Company's Reportable Segments	  Exploration and Production Midstream Services Other Total  (in millions)  Three months ended March 31, 2017:  Revenues from external customers $ 566 $ 280 $ – $ 846  Intersegment revenues (3) 578 – 575  Depreciation, depletion and amortization expense 90 16 – 106  Operating income 225 41 – 266  Interest expense (1) 32 – – 32  Gain on derivatives 116 – – 116  Loss on early extinguishment of debt – – (1) (1)  Other income, net 2 – – 2  Assets 4,413 1,268 1,515 (2) 7,196  Capital investments (3) 283 6 1 290   Three months ended March 31, 2016:  Revenues from external customers $ 343 $ 236 $ – $ 579  Intersegment revenues (7) 385 – 378  Depreciation, depletion and amortization expense 127 16 – 143  Impairment of natural gas and oil properties 1,034 – – 1,034  Operating income (loss) (1,160) (4) 60 (5) – (1,100)  Interest expense (1) 14 – – 14  Loss on derivatives (13) (1) – (14)  Other loss, net (2) (1) – (3)  Provision for income taxes (1) 1 – – 1  Assets 5,538 1,220 1,760 (2) 8,518  Capital investments (3) 120 2 – 122  (1) Interest expense and the provision for income taxes by segment are an allocation of corporate amounts as they are incurred at the corporate level. (2) Other assets represent corporate assets not allocated to segments and assets for non-reportable segments. At March 31, 2017 and 2016, other assets includes approximately $1.4 billion and $1.6 billion in cash and cash equivalents, respectively. (3) Capital investments includes decreases of $52 million and $78 million for the three months ended March 31, 2017 and 2016 , respectively, relating to the change in accrued expenditures between periods. (4) Operating income (loss) for the E&P segment includes $61 million related to restructuring charges for the three months ended March 31, 2016. (5) Operating income (loss) for the Midstream segment includes $3 million related to restructuring charges for the three months ended March 31, 2016.

Basis Of Presentation (Narrativ

Basis Of Presentation (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017segment
Basis Of Presentation [Abstract]
Number of segments	2

Cash And Cash Equivalents (Summ

Cash And Cash Equivalents (Summary Of Cash And Cash Equivalents) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Cash And Cash Equivalents [Abstract]
Cash	$ 265	$ 254
Marketable securities	1,117	1,169
Total	$ 1,382	$ 1,423	$ 1,597	$ 15

Reduction In Workforce (Narrati

Reduction In Workforce (Narrative) (Details)	1 Months Ended
	Jan. 31, 2016
Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Positions eliminated, percent	40.00%

Reduction In Workforce (Summary

Reduction In Workforce (Summary Of Restructuring Charges) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 64
Exploration and Production [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	61
Midstream Services [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	3
Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Severance (including payroll taxes)	42
Stock-based compensation	18
Pension and other postretirement benefits	3
Outplacement services, other	1
Total restructuring charges	64
Workforce Reduction [Member] | Exploration and Production [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	61
Workforce Reduction [Member] | Midstream Services [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 3

Natural Gas And Oil Properties

Natural Gas And Oil Properties (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017$ / bbl$ / MMBTU	Mar. 31, 2016USD ($)$ / bbl$ / MMBTU
Natural Gas and Oil Properties [Line Items]
Natural gas, oil and NGL reserves discount	10.00%
Period of time needed to calculate ceiling value of reserves	12 months	12 months
Impairment of natural gas and oil properties, net of tax | $		$ 641
Natural Gas [Member] | Henry Hub [Member]
Natural Gas and Oil Properties [Line Items]
Full cost ceiling test, price | $ / MMBTU	2.73	2.40
Oil [Member] | West Texas Intermediate [Member]
Natural Gas and Oil Properties [Line Items]
Full cost ceiling test, price	44.10	42.77
NGL [Member]
Natural Gas and Oil Properties [Line Items]
Full cost ceiling test, price	10.17	5.76

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 17, 2017	Jul. 31, 2016	Mar. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument			$ 4,659	$ 4,684
Common stock, date dividend to be paid			Apr. 17, 2017
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued		98,900,000
Price per share		$ 13
Proceeds from issuance of shares		$ 1,247
Series B Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Liquidation preference per share			$ 1,000	$ 1,000
Trading day period			20 days
Long-term Debt [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument			$ 4,393	$ 4,643
Long-term Debt [Member] | 2015 Term Facility [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Payments on long-term debt		375
Debt instrument			$ 750
Senior Notes [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Purchase of note principal		$ 700
Minimum [Member] | Depositary Shares [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued upon conversion			1.85014
Minimum [Member] | Series B Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued upon conversion			37.0028
Potential number of shares issued upon conversion			63,829,830
Maximum [Member] | Depositary Shares [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued upon conversion			2.17391
Maximum [Member] | Series B Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued upon conversion			43.4782
Potential number of shares issued upon conversion			74,999,895
Subsequent Event [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock, shares issued as stock dividend	3,346,865

Earnings Per Share (Schedule Of

Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 351	$ (1,132)
Mandatory convertible preferred stock dividend	27	27
Participating securities - mandatory convertible preferred stock	43
Net Income (Loss) Attributable to Common Stock	$ 281	$ (1,159)
Number of common shares: Weighted average outstanding	493,068,000	382,870,847
Number of common shares: Issued upon assumed exercise of outstanding stock options	82,845
Number of common shares: Effect of issuance of non-vested restricted common stock	770,429
Number of common shares: Effect of issuance of non-vested performance units	573,721
Number of common shares: Effect of issuance of mandatory convertible preferred stock
Number of common shares: Weighted average and potential dilutive outstanding	494,494,995	382,870,847
Basic	$ 0.57	$ (3.03)
Diluted	$ 0.57	$ (3.03)

Earnings Per Share (Schedule 43

Earnings Per Share (Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share) (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	78,066,295	86,809,533
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	1,854,004	5,732,521
Unvested Share-Based Payment [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	1,212,396	5,779,820
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares		297,297
Mandatory Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	74,999,895	74,999,895

Derivatives And Risk Manageme44

Derivatives And Risk Management (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative liabilities	$ 2	$ 3
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative liabilities	2
Notional amount	$ 170
Derivative, expiration	Jun. 30, 2020
Natural Gas [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities	$ 227

Derivatives And Risk Manageme45

Derivatives And Risk Management (Schedule Of Derivative Instruments, Notional Amount In BCF, Weighted Average Contract Prices And Fair Value) (Details) - Not Designated as Hedging Instrument [Member] $ in Millions, ft³ in Billions	3 Months Ended
	Mar. 31, 2017USD ($)$ / MMBTUft³
Fixed Price Swaps - 2017 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	262
Average price per MMBtu	3.07
Fair value | $	$ (58)
Two-way Costless-collars - 2017 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	65
Fair value | $	$ (11)
Two-way Costless-collars - 2017 Purchased Puts [Member]
Derivative [Line Items]
Floor price per MMBtu	2.92
Two-way Costless-collars - 2017 Sold Calls [Member]
Derivative [Line Items]
Cap price per MMBtu	3.34
Three-way Costless-collars - 2017 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	102
Fair value | $	$ (16)
Three-way Costless-collars - 2017 Sold Puts [Member]
Derivative [Line Items]
Floor price per MMBtu	2.29
Three-way Costless-collars - 2017 Purchased Puts [Member]
Derivative [Line Items]
Floor price per MMBtu	2.97
Three-way Costless-collars - 2017 Sold Calls [Member]
Derivative [Line Items]
Cap price per MMBtu	3.30
Basis Swaps - 2017 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	138
Basis differential per MMBtu	(1.04)
Fair value | $	$ (73)
Financial protection on production - 2017 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	567
Fair value | $	$ (158)
Fixed Price Swaps - 2018 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	68
Average price per MMBtu	3.02
Fair value | $	$ (1)
Two-way Costless-collars - 2018 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	23
Fair value | $	$ (6)
Two-way Costless-collars - 2018 Purchased Puts [Member]
Derivative [Line Items]
Floor price per MMBtu	2.97
Two-way Costless-collars - 2018 Sold Calls [Member]
Derivative [Line Items]
Cap price per MMBtu	3.56
Three-way Costless-collars - 2018 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	245
Fair value | $	$ (6)
Three-way Costless-collars - 2018 Sold Puts [Member]
Derivative [Line Items]
Floor price per MMBtu	2.39
Three-way Costless-collars - 2018 Purchased Puts [Member]
Derivative [Line Items]
Floor price per MMBtu	2.97
Three-way Costless-collars - 2018 Sold Calls [Member]
Derivative [Line Items]
Cap price per MMBtu	3.37
Basis Swaps - 2018 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	20
Basis differential per MMBtu	(0.95)
Fair value | $	$ (15)
Financial protection on production - 2018 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	356
Fair value | $	$ (28)
Three-way Costless-collars - 2019 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	99
Fair value | $	$ (2)
Three-way Costless-collars - 2019 Sold Puts [Member]
Derivative [Line Items]
Floor price per MMBtu	2.50
Three-way Costless-collars - 2019 Purchased Puts [Member]
Derivative [Line Items]
Floor price per MMBtu	2.95
Three-way Costless-collars - 2019 Sold Calls [Member]
Derivative [Line Items]
Cap price per MMBtu	3.31
Financial protection on production - 2019 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	99
Fair value | $	$ (2)
Sold Call Options - 2017 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	64
Floor price per MMBtu	3.54
Fair value | $	$ (10)
Premium paid | $	$ 5
Sold Call Options - 2018 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	63
Floor price per MMBtu	3.50
Fair value | $	$ (14)
Sold Call Options - 2019 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	52
Floor price per MMBtu	3.50
Fair value | $	$ (10)
Sold Call Options - 2020 [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	32
Floor price per MMBtu	3.75
Fair value | $	$ (5)
Sold Call Options [Member]
Derivative [Line Items]
Volume (Bcf) | ft³	211
Fair value | $	$ (39)

Derivatives And Risk Manageme46

Derivatives And Risk Management (Balance Sheet Classification Of Derivative Financial Instruments) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative assets	$ 180	$ 155
Derivative liabilities	409	530
Fixed Price Swaps [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2
Fixed Price Swaps [Member] | Other Long-Term Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	7	1
Fixed Price Swaps [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	68	175
Fixed Price Swaps [Member] | Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities		3
Two-way Costless-collars [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	11	8
Two-way Costless-collars [Member] | Other Long-Term Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		2
Two-way Costless-collars [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	28	49
Two-way Costless-collars [Member] | Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities		9
Three-way Costless-collars [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	23	11
Three-way Costless-collars [Member] | Other Long-Term Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	120	100
Three-way Costless-collars [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	62	70
Three-way Costless-collars [Member] | Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	105	122
Basis Swaps [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2	32
Basis Swaps [Member] | Other Long-Term Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		1
Basis Swaps [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	89	13
Basis Swaps [Member] | Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	1	5
Sold Call Options [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	15
Sold Call Options [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	32	46
Sold Call Options [Member] | Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	22	35
Interest Rate Swaps [Member] | Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	1	2
Interest Rate Swaps [Member] | Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	1	$ 1
Sold Call Options - 2017 [Member]
Derivatives, Fair Value [Line Items]
Premium paid	$ 5

Derivatives And Risk Manageme47

Derivatives And Risk Management (Summary Of Before Tax Effect Of Fair Value Hedges Not Designated For Hedge Accounting) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Gain (Loss) on Derivatives, Unsettled	$ 146	$ (21)
Derivative Instrument, Gain (Loss) on Derivatives, Settled	(30)	7
Total gain (loss) on derivatives	116	(14)
Fixed Price Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Gain (Loss) on Derivatives, Unsettled	118	20
Derivative Instrument, Gain (Loss) on Derivatives, Settled	(16)	4
Purchased Put Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Gain (Loss) on Derivatives, Unsettled		15
Two-way Costless-collars [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Gain (Loss) on Derivatives, Unsettled	31
Derivative Instrument, Gain (Loss) on Derivatives, Settled	(3)
Three-way Costless-collars [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Gain (Loss) on Derivatives, Unsettled	57
Derivative Instrument, Gain (Loss) on Derivatives, Settled	(4)
Basis Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Gain (Loss) on Derivatives, Unsettled	(103)	(3)
Derivative Instrument, Gain (Loss) on Derivatives, Settled	(1)	4
Sold Call Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Gain (Loss) on Derivatives, Unsettled	42	(50)
Derivative Instrument, Gain (Loss) on Derivatives, Settled	(6)
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Gain (Loss) on Derivatives, Unsettled	$ 1	(3)
Derivative Instrument, Gain (Loss) on Derivatives, Settled		$ (1)

Reclassifications From Accumu48

Reclassifications From Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2016	$ (39)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from other comprehensive income (loss)
Net current-period other comprehensive income (loss)
Ending balance, March 31, 2017	(39)
Pension And Other Postretirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2016	(19)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from other comprehensive income (loss)
Net current-period other comprehensive income (loss)
Ending balance, March 31, 2017	(19)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2016	(20)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from other comprehensive income (loss)
Net current-period other comprehensive income (loss)
Ending balance, March 31, 2017	$ (20)

Reclassifications From Accumu49

Reclassifications From Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified From Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
General and administrative expenses	$ 50	$ 54
Provision for income taxes		1
Net Income (Loss)	351	$ (1,132)
Reclassification from Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (Loss)
Pension And Other Postretirement [Member] | Reclassification from Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
General and administrative expenses	1
Provision for income taxes	1
Net Income (Loss)

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, net	$ (229)		$ (375)
Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,382		1,423
Senior notes	3,141		3,166
Derivative instruments, net	(229)		(375)
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,382		1,423
Senior notes	3,088		3,182
Derivative instruments, net	$ (229)		$ (375)
Long-term Debt [Member] | Term Loan 1 due December 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maturity date, year and month	2020-12	2018-11	2020-12
Accelerated maturity date, year and month if not amended, redeemed or refinanced	2019-10
Long-term Debt [Member] | Term Loan 2 due December 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maturity date, year and month	2020-12		2020-12
Accelerated maturity date, year and month if not amended, redeemed or refinanced	2019-10
Long-term Debt [Member] | 2020 Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maturity date, year and month	2020-01		2020-01
Amount to be amended, redeemed or refinanced to avoid acceleration	$ 765		$ 765
Long-term Debt [Member] | Carrying Amount [Member] | Term Loan 1 due December 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	327		327
Long-term Debt [Member] | Carrying Amount [Member] | Term Loan 2 due December 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	1,191		1,191
Long-term Debt [Member] | Fair Value [Member] | Term Loan 1 due December 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	327		327
Long-term Debt [Member] | Fair Value [Member] | Term Loan 2 due December 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	1,191		$ 1,191
Sold Call Options - 2017 [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premium paid	$ 5

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ (229)	$ (375)
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	(61)	(180)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	(168)	(195)
Fixed Price Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	9	1
Derivative liabilities	(68)	(178)
Fixed Price Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	9	1
Derivative liabilities	(68)	(178)
Two-way Costless-collars [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	11	10
Derivative liabilities	(28)	(58)
Two-way Costless-collars [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	11	10
Derivative liabilities	(28)	(58)
Three-way Costless-collars [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	143	111
Derivative liabilities	(167)	(192)
Three-way Costless-collars [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	143	111
Derivative liabilities	(167)	(192)
Basis Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2	33
Derivative liabilities	(90)	(18)
Basis Swaps [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2	33
Derivative liabilities	(90)	(18)
Sold Call Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	15
Derivative liabilities	(54)	(81)
Sold Call Options [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	15
Derivative liabilities	(54)	(81)
Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(2)	(3)
Interest Rate Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(2)	$ (3)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(2)
Not Designated as Hedging Instrument [Member] | Sold Call Options - 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premium paid	$ 5

Fair Value Measurements (Reconc

Fair Value Measurements (Reconciliations For Change In Net Fair Value Of Derivative Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value Measurements [Abstract]
Balance at beginning of period	$ (195)	$ 3
Included in earnings	13	(34)
Settlements	14	(4)
Balance at end of period	(168)	(35)
Change in gains (losses) included in earnings relating to derivatives still held as of March 31	$ 27	$ (38)

Debt (2016 Credit Facility - Na

Debt (2016 Credit Facility - Narrative) (Details)	Apr. 01, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2016USD ($)	Dec. 31, 2013USD ($)
Debt Instrument [Line Items]
Debt instrument			$ 4,659,000,000			$ 4,684,000,000
Long-term Debt [Member]
Debt Instrument [Line Items]
Debt instrument			4,393,000,000			4,643,000,000
Long-term Debt [Member] | 2013 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 66,000,000					$ 2,000,000,000
Repayment of line of credit	$ 1,550,000,000	285,000,000
Amount outstanding			0
Long-term Debt [Member] | 2016 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		743,000,000
Long-term Debt [Member] | 2013 & 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Amount outstanding			0
Long-term Debt [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Amount outstanding			$ 327,000,000
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,934,000,000
Maturity date, year and month		2020-12
Incremental increase EBITDAX to interest expense ratio			0.25
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
EBITDAX to interest expense ratio			1
Liquidity requirement			$ 300,000,000
Anti-hoarding provision, required unrestricted cash			$ 100,000,000
Collateral coverage ratio			1.50
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Minimum [Member] | Scenario, Forecast [Member]
Debt Instrument [Line Items]
EBITDAX to interest expense ratio				1.50	1.50
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Liquidity requirement			$ 500,000,000
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Eurodollar [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis points			1.75%
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Eurodollar [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis points			2.50%
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis points			0.75%
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis points			1.50%
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Over LIBOR [Member]
Debt Instrument [Line Items]
Basis points			2.50%
Term Loan 2 due December 2020 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Debt instrument		$ 1,191,000,000	$ 1,191,000,000			$ 1,191,000,000
Maturity date, year and month			2020-12			2020-12
Accelerated maturity date, year and month if not amended, redeemed or refinanced			2019-10
2020 Senior Notes [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Maturity date, year and month			2020-01			2020-01
Amount to be amended, redeemed or refinanced to avoid acceleration			$ 765,000,000			$ 765,000,000

Debt (2013 Credit Facility - Na

Debt (2013 Credit Facility - Narrative) (Details) - USD ($)	Apr. 01, 2016	Mar. 30, 2016	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2013
Debt Instrument [Line Items]
Debt instrument				$ 4,659,000,000	$ 4,684,000,000
Adjusted debt capital structure, percentage				34.00%
Long-term Debt [Member]
Debt Instrument [Line Items]
Debt instrument				$ 4,393,000,000	4,643,000,000
Long-term Debt [Member] | 2013 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 66,000,000			$ 2,000,000,000
Line of credit, amount borrowed		$ 1,550,000,000
Repayment of line of credit	$ 1,550,000,000		285,000,000
Credit facility, maturity date				Dec. 1, 2018
Amount outstanding				$ 0
Debt percentage of adjusted book capital structure covenant				60.00%
Long-term Debt [Member] | 2016 Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			743,000,000
Term Loan 2 due December 2020 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Debt instrument			$ 1,191,000,000	$ 1,191,000,000	$ 1,191,000,000

Debt (2015 Term Facility - Narr

Debt (2015 Term Facility - Narrative) (Details) $ in Millions	1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2016USD ($)a	Jul. 31, 2016USD ($)	Nov. 30, 2015USD ($)	Mar. 31, 2017USD ($)	Jun. 30, 2016	Dec. 31, 2016USD ($)
Term Loan 1 due December 2020 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Loans payable			$ 750
Debt instrument, term			3 years
Payments on long-term debt		$ 375
Maturity date, year and month				2020-12	2018-11	2020-12
Accelerated maturity date, year and month if not amended, redeemed or refinanced				2019-10
2020 Senior Notes [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Payments on long-term debt	$ 48
Maturity date, year and month				2020-01		2020-01
Amount to be amended, redeemed or refinanced to avoid acceleration				$ 765		$ 765
Over LIBOR [Member] | Term Loan 1 due December 2020 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Basis points				2.50%
West Virginia [Member]
Debt Instrument [Line Items]
Area of land sold | a	55,000

Debt (Senior Notes - Narrative)

Debt (Senior Notes - Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Jul. 31, 2016	Jan. 31, 2015	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Net loss on extinguishment of debt			$ (1)
Unamortized debt expense			26	$ 28
Long-term Debt [Member]
Debt Instrument [Line Items]
Unamortized debt expense			$ 26	$ 28
Senior Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 2,200
Purchase of note principal	$ 700
Senior Notes [Member] | Over LIBOR [Member]
Debt Instrument [Line Items]
Incremental increase in basis points resulting from downgrades			0.25%
Incremental decrease in basis points resulting from upgrades			0.25%
Increase in basis spread	1.75%
3.30% Senior Notes due January 2018 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Senior notes		$ 350
Stated interest rate	5.05%	3.30%		3.30%
Maturity date, year		2,018
Percentage of face amount, sold to public		99.949%
Unamortized debt expense
4.05% Senior Notes due January 2020 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Senior notes		$ 850
Stated interest rate	5.80%	4.05%	4.05%	4.05%
Maturity date, year		2,020
Percentage of face amount, sold to public		99.897%
Unamortized debt expense			$ 4	$ 5
4.95% Senior Notes due January 2025 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Senior notes		$ 1,000
Stated interest rate	6.70%	4.95%	4.95%	4.95%
Maturity date, year		2,025
Percentage of face amount, sold to public		99.782%
Unamortized debt expense			$ 6	$ 7
Maximum [Member] | 3.30% Senior Notes due January 2018 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Stated interest rate			5.30%
Maximum [Member] | 4.05% Senior Notes due January 2020 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Stated interest rate			6.05%
Maximum [Member] | 4.95% Senior Notes due January 2025 [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Stated interest rate			6.95%

Debt (Components Of Debt) (Deta

Debt (Components Of Debt) (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2017	Sep. 30, 2016	Jul. 31, 2016	Mar. 31, 2017	Jun. 30, 2016	Dec. 31, 2016	Jan. 31, 2015
Debt Instrument [Line Items]
Debt Instrument	$ 4,659			$ 4,659		$ 4,684
Unamortized Issuance Cost	(26)			(26)		(28)
Unamortized Debt Discount	(3)			(3)		(3)
Total	4,630			4,630		4,653
Net loss on extinguishment of debt				(1)
Short-term Debt [Member]
Debt Instrument [Line Items]
Debt Instrument	266			266		41
Unamortized Issuance Cost
Unamortized Debt Discount
Total	266			266		41
Short-term Debt [Member] | 7.35% Senior Notes due October 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument	15			15		15
Unamortized Issuance Cost
Unamortized Debt Discount
Total	$ 15			$ 15		$ 15
Stated interest rate	7.35%			7.35%		7.35%
Maturity date, year and month				2017-10		2017-10
Short-term Debt [Member] | 7.125% Senior Notes due October 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument	$ 25			$ 25		$ 25
Unamortized Issuance Cost
Unamortized Debt Discount
Total	$ 25			$ 25		$ 25
Stated interest rate	7.125%			7.125%		7.125%
Maturity date, year and month				2017-10		2017-10
Short-term Debt [Member] | 3.30% Senior Notes due January 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument	$ 38			$ 38
Total	$ 38			$ 38
Stated interest rate	3.30%			3.30%
Maturity date, year and month				2018-01
Short-term Debt [Member] | 7.50% Senior Notes due February 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument	$ 187			$ 187
Total	$ 187			$ 187
Stated interest rate	7.50%			7.50%
Maturity date, year and month				2018-02
Short-term Debt [Member] | 7.15% Senior Notes due June 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument	$ 1			$ 1		$ 1
Unamortized Issuance Cost
Unamortized Debt Discount
Total	$ 1			$ 1		$ 1
Stated interest rate	7.15%			7.15%		7.15%
Maturity date, year and month				2018-06		2018-06
Long-term Debt [Member]
Debt Instrument [Line Items]
Debt Instrument	$ 4,393			$ 4,393		$ 4,643
Unamortized Issuance Cost	(26)			(26)		(28)
Unamortized Debt Discount	(3)			(3)		(3)
Total	4,364			4,364		4,612
Long-term Debt [Member] | Term Loan 1 due December 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument	327			327		327
Unamortized Issuance Cost	(2)			(2)		(2)
Unamortized Debt Discount
Total	325			$ 325		$ 325
Variable interest rate				3.45%		3.22%
Maturity date, year and month				2020-12	2018-11	2020-12
Payments on long-term debt			$ 375
Accelerated maturity date, year and month if not amended, redeemed or refinanced				2019-10
Long-term Debt [Member] | Term Loan 2 due December 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument	1,191			$ 1,191	$ 1,191	$ 1,191
Unamortized Issuance Cost	(10)			(10)		(10)
Unamortized Debt Discount
Total	1,181			$ 1,181		$ 1,181
Variable interest rate				3.45%		3.22%
Maturity date, year and month				2020-12		2020-12
Accelerated maturity date, year and month if not amended, redeemed or refinanced				2019-10
Long-term Debt [Member] | 3.30% Senior Notes due January 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument						$ 38
Unamortized Issuance Cost
Unamortized Debt Discount
Total						$ 38
Stated interest rate			5.05%			3.30%	3.30%
Maturity date, year and month						2018-01
Long-term Debt [Member] | 7.50% Senior Notes due February 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument						$ 212
Unamortized Issuance Cost
Unamortized Debt Discount
Total						$ 212
Stated interest rate						7.50%
Maturity date, year and month						2018-02
Debt repurchased	25			$ 25
Net loss on extinguishment of debt	(1)
Long-term Debt [Member] | 7.15% Senior Notes due June 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument	25			25		$ 25
Unamortized Issuance Cost
Unamortized Debt Discount
Total	$ 25			$ 25		$ 25
Stated interest rate	7.15%			7.15%		7.15%
Maturity date, year and month				2018-06		2018-06
Long-term Debt [Member] | 4.05% Senior Notes due January 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument	$ 850			$ 850		$ 850
Unamortized Issuance Cost	(4)			(4)		(5)
Unamortized Debt Discount
Total	$ 846			$ 846		$ 845
Stated interest rate	4.05%		5.80%	4.05%		4.05%	4.05%
Maturity date, year and month				2020-01		2020-01
Long-term Debt [Member] | 4.10% Senior Notes due March 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument	$ 1,000			$ 1,000		$ 1,000
Unamortized Issuance Cost	(4)			(4)		(4)
Unamortized Debt Discount	(1)			(1)		(1)
Total	$ 995			$ 995		$ 995
Stated interest rate	4.10%			4.10%		4.10%
Maturity date, year and month				2022-03		2022-03
Long-term Debt [Member] | 4.95% Senior Notes due January 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument	$ 1,000			$ 1,000		$ 1,000
Unamortized Issuance Cost	(6)			(6)		(7)
Unamortized Debt Discount	(2)			(2)		(2)
Total	$ 992			$ 992		$ 991
Stated interest rate	4.95%		6.70%	4.95%		4.95%	4.95%
Maturity date, year and month				2025-01		2025-01
Long-term Debt [Member] | 2020 Senior Notes [Member]
Debt Instrument [Line Items]
Maturity date, year and month				2020-01		2020-01
Payments on long-term debt		$ 48
Amount to be amended, redeemed or refinanced to avoid acceleration				$ 765		$ 765
Over LIBOR [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Increase in basis spread			1.75%

Commitments And Contingencies58

Commitments And Contingencies (Narrative) (Details)	1 Months Ended	3 Months Ended
	Sep. 30, 2015plaintiffitem	Mar. 31, 2017USD ($)item
Commitments And Contingencies [Line Items]
Obligation under transportation agreements | $		$ 8,672,000,000
Guarantee obligations relative to the firms transportation agreements and gathering project and services | $		$ 821,000,000
Number of state cases set for trial		1
Indemnification liability | $		$ 0
Arkansas Royalty Litigation [Member]
Commitments And Contingencies [Line Items]
Number of cases		3
Arkansas Royalty Litigation [Member] | Arkansas State Court 2010 and 2013 [Member]
Commitments And Contingencies [Line Items]
Number of cases		2
Arkansas Royalty Litigation [Member] | Federal Court 2014 [Member]
Commitments And Contingencies [Line Items]
Number of cases		1
Arkansas Royalty Litigation [Member] | Arkansas State Court 2015 [Member]
Commitments And Contingencies [Line Items]
Number of cases	3
Number of plaintiffs | plaintiff	248
Arkansas Royalty Litigation [Member] | Federal Court [Member]
Commitments And Contingencies [Line Items]
Number of cases removed to federal court	2
Minimum [Member] | Arkansas Royalty Litigation [Member] | Federal Court 2014 [Member]
Commitments And Contingencies [Line Items]
Loss contingency, range of possible loss, minimum | $		$ 98,000,000
Pending Regulatory Approval and/or Construction [Member]
Commitments And Contingencies [Line Items]
Obligation under transportation agreements | $		$ 3,661,000,000

Commitments And Contingencies59

Commitments And Contingencies (Schedule Of Future Obligation Under Transportation Agreements) (Details) $ in Millions	Mar. 31, 2017USD ($)
Other Commitments [Line Items]
Less than 1 year	$ 627
1 to 3 years	1,510
3 to 5 years	1,265
5 to 8 years	1,562
More than 8 years	3,708
Total transportation charges	8,672
Infrastructure Currently in Service [Member]
Other Commitments [Line Items]
Less than 1 year	592
1 to 3 years	1,139
3 to 5 years	791
5 to 8 years	832
More than 8 years	1,657
Total transportation charges	5,011
Pending Regulatory Approval and/or Construction [Member]
Other Commitments [Line Items]
Less than 1 year	35
1 to 3 years	371
3 to 5 years	474
5 to 8 years	730
More than 8 years	2,051
Total transportation charges	$ 3,661

Pension Plan And Other Postre60

Pension Plan And Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 5
Company's expected additional annual contribution	$ 9
Common Stock in Treasury, Shares	31,269		31,269
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (gain)	$ 3	$ 4
Benefit obligation	34		$ 36
Discount rate		4.60%		4.20%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (gain)	1	$ 1
Benefit obligation	$ 13		$ 13
Discount rate		4.60%		4.20%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Common stock purchased under the terms of the Non-Qualified Plan presented as treasury stock	11,686		31,269

Pension Plan And Other Postre61

Pension Plan And Other Postretirement Benefits (Pension And Other Postretirement Benefit Costs) (Details) - Pension Benefits [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 4
Interest cost	1	2
Expected return on plan assets	(1)	(2)
Amortization of prior service cost
Amortization of net loss	1
Net periodic benefit cost	$ 3	$ 4

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2016	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to the Company's unvested stock option grants, restricted stock grants, and performance units		$ 96
Weighted average period over which cost is recognized, years		3 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, exercised, number of options
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock awards from grant date		3 years
Liability-Classified Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock awards from grant date		3 years
Workforce Reduction [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Positions eliminated, percent	40.00%

Stock-Based Compensation (Sched

Stock-Based Compensation (Schedule Of Stock-Based Compensation Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation cost - expensed	$ 6	$ 23
Stock-based compensation cost - capitalized	$ 4	3
Workforce Reduction [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation cost - expensed		$ 18

Stock-Based Compensation (Summa

Stock-Based Compensation (Summary Of Stock Option Activity) (Details) - Stock Options [Member] shares in Thousands	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, Outstanding at December 31, 2016, Number of Options | shares	5,416
Stock options, Granted, Number of Options | shares	1,322
Stock options, Exercised, Number of Options | shares
Stock options, Forfeited or expired, Number of Options | shares	(17)
Stock options, Outstanding at March 31, 2017, Number of Options | shares	6,721
Stock options, Exercisable at March 31, 2017, Number of Options | shares	3,537
Stock options, Outstanding at December 31, 2016, Weighted Average Exercise Price | $ / shares	$ 23.46
Stock options, Granted, Weighted Average Exercise Price | $ / shares	8.59
Stock options, Exercised, Weighted Average Exercise Price | $ / shares
Stock options, Forfeited or expired, Weighted Average Exercise Price | $ / shares	45.57
Stock options, Outstanding at March 31, 2017, Weighted Average Exercise Price | $ / shares	20.48
Stock options, Exercisable at March 31, 2017, - Weighted Average Exercise Price | $ / shares	$ 29.34

Stock-Based Compensation (Sum65

Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) - Restricted Stock [Member] shares in Thousands	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares/units at December 31, 2016, Number of Shares | shares	3,321
Granted, Number of Shares/Units | shares	4,549
Vested, Number of Shares/Units | shares	(70)
Forfeited, Number of Shares/Units | shares	(113)
Unvested shares/units at March 31, 2017, Number of Shares | shares	7,687
Unvested shares/units at December 31, 2016, Weighted Average Fair Value | $ / shares	$ 11.85
Granted, Weighted Average Fair Value | $ / shares	8.59
Vested, Weighted Average Fair Value | $ / shares	13.45
Forfeited, Weighted Average Fair Value | $ / shares	10.05
Unvested shares at March 31, 2017, Weighted Average Fair Value | $ / shares	$ 9.93

Stock-Based Compensation (Sum66

Stock-Based Compensation (Summary Of Performance Unit Activity) (Details) - Performance Units [Member]	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares/units at December 31, 2016, Number of Shares	719,000
Granted, Number of Shares/Units	1,197,000
Vested, Number of Shares/Units
Forfeited, Number of Shares/Units
Unvested shares/units at March 31, 2017, Number of Shares	1,916,000
Unvested shares/units at December 31, 2016, Weighted Average Fair Value | $ / shares	$ 11.46
Granted, Weighted Average Fair Value | $ / shares	10.47
Vested, Weighted Average Fair Value | $ / shares
Forfeited, Weighted Average Fair Value | $ / shares
Unvested shares at March 31, 2017, Weighted Average Fair Value | $ / shares	$ 10.84
Vesting period for stock awards from grant date	3 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Shares/Units	0
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Shares/Units	2

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 846	$ 579
Depreciation, depletion and amortization expense	106	143
Impairment of natural gas and oil properties		1,034
Operating income (loss)	266	(1,100)
Interest expense	32	14
Gain (loss) on derivatives	116	(14)
Loss on Early Extinguishment of Debt	(1)
Other income (loss), net	2	(3)
Provision for income taxes		1
Assets	7,196	8,518	$ 7,076
Capital investments	290	122
Restructuring charges		64
Cash and cash equivalents	1,382	1,597	$ 1,423	$ 15
Change in accrued expenditures	(52)	(78)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(575)	(378)
Exploration and Production [Member]
Segment Reporting Information [Line Items]
Revenues	566	343
Depreciation, depletion and amortization expense	90	127
Impairment of natural gas and oil properties		1,034
Operating income (loss)	225	(1,160)
Interest expense	32	14
Gain (loss) on derivatives	116	(13)
Other income (loss), net	2	(2)
Provision for income taxes		1
Assets	4,413	5,538
Capital investments	283	120
Restructuring charges		61
Exploration and Production [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	3	7
Midstream Services [Member]
Segment Reporting Information [Line Items]
Revenues	280	236
Depreciation, depletion and amortization expense	16	16
Operating income (loss)	41	60
Gain (loss) on derivatives		(1)
Other income (loss), net		(1)
Assets	1,268	1,220
Capital investments	6	2
Restructuring charges		3
Midstream Services [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(578)	(385)
Other [Member]
Segment Reporting Information [Line Items]
Loss on Early Extinguishment of Debt	(1)
Assets	1,515	1,760
Capital investments	1
Cash and cash equivalents	1,400	1,600
Marketing [Member] | Midstream Services [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ (524)	$ (319)

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Taxes [Abstract]
Effective tax rate	0.00%	0.00%
Increase (decrease) in valuation allowance	$ (75)	$ 431

New Accounting Pronouncements (

New Accounting Pronouncements (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
New Accounting Pronouncements [Abstract]
Net cumulative-effect adjustment	$ 59