Newfield Exploration (NFX) 10-Q 6 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	3 Months Ended
	Mar. 31, 2015	1-May-15	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	NEWFIELD EXPLORATION CO /DE/
Entity Central Index Key	912750
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$5,900,000,000
Entity Common Stock, Shares Outstanding		162,800,912

Consolidated_Balance_Sheet

Consolidated Balance Sheet (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$783	$14
Restricted cash	3	0
Accounts receivable	354	439
Inventories	27	33
Derivative assets	425	431
Other current assets	18	23
Total current assets	1,610	940
Oil and gas properties — full cost method	15,983	16,384
Less — accumulated depreciation, depletion and amortization	8,380	8,152
Total oil and gas properties, net	7,603	8,232
Other property and equipment, net	176	182
Long-term investments	22	26
Other assets	43	28
Total assets	9,678	9,598
Derivative assets	224	190
Current liabilities:
Accounts payable	62	32
Accrued liabilities	606	880
Advances from joint owners	48	34
Asset retirement obligations	2	3
Derivative liabilities	1	8
Deferred taxes	143	144
Total current liabilities	862	1,101
Other liabilities	45	45
Derivative liabilities	2	0
Long-term debt	3,146	2,892
Asset retirement obligations	183	183
Deferred taxes	1,202	1,484
Total long-term liabilities	4,578	4,604
Commitments and contingencies	0	0
Stockholders' equity:
Preferred stock ($0.01 par value, 5,000,000 shares authorized; no shares issued)	0	0
Common stock ($0.01 par value)	2	1
Additional paid-in capital	2,401	1,576
Treasury stock (at cost)	-11	-10
Accumulated other comprehensive gain (loss)	-1	-1
Retained earnings	1,847	2,327
Total stockholders' equity	4,238	3,893
Total liabilities and stockholders' equity	$9,678	$9,598

Consolidated_Balance_Sheet_Par

Consolidated Balance Sheet (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
ASSETS
Property and equipment, at cost, based on the full cost method of accounting for oil and gas properties	$729	$677
Stockholders' equity:
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	163,001,991	137,603,643
Treasury stock, shares	304,944	275,069
Commitments and Contingencies	$0	$0

Consolidated_Statement_of_Oper

Consolidated Statement of Operations (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	($3.30)	$0.19
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$0	$1.89
Earnings (Loss) Per Share, Basic	($3.30)	$2.08
Income (Loss) from Continuing Operations, Per Diluted Share	($3.30)	$0.19
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$0	$1.88
Earnings (Loss) Per Share, Diluted	($3.30)	$2.07
Weighted-average number of shares outstanding for basic earnings (loss) per share	145	136
Weighted average number of shares outstanding for diluted earnings (loss) per share	145	137
Operating expenses:
Depreciation, depletion and amortization	$237	$224
Ceiling test impairment	792	0
Other income (expenses):
Interest expense	-44	-51
Interest Costs Capitalized Adjustment	7	13
Commodity derivative income (expense)	153	-96
Other	8	2
Total other income (expenses)	124	-132
Income (loss) before income taxes	-760	50
Income tax provision (benefit):
Current	3	3
Deferred	-283	20
Total income tax provision (benefit)	-280	23
Income (Loss) from Continuing Operations Attributable to Parent	-480	27
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	257
Net income (loss)	-480	284
Continuing Operations [Member]
Statement [Line Items]
Oil, gas and NGL revenues	349	571
Operating expenses:
Lease operating	75	74
Gas Gathering, Transportation, Marketing and Processing Costs	49	37
Production and other taxes	13	28
Depreciation, depletion and amortization	237	192
General and administrative	63	56
Ceiling test impairment	792	0
Other	4	2
Total operating expenses	1,233	389
Income (loss) from operations	($884)	$182

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net Income (Loss) Attributable to Parent [Abstract]
Net income (loss)	($480)	$284
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of tax	0	0
Other Comprehensive Income (Loss), Net of Tax	0	0
Comprehensive income (loss)	($480)	$284

Consolidated_Statement_of_Stoc

Consolidated Statement of Stockholders' Equity (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Common Stock, Shares, Issued	163,001,991	137,603,643
Common Stock, Value, Issued	$2	$1
Treasury Stock, Shares	-304,944	-275,069
Treasury Stock, Value	-11	-10
Additional Paid in Capital	2,401	1,576
Retained Earnings (Accumulated Deficit)	1,847	2,327
Accumulated Other Comprehensive Income (Loss), Net of Tax	-1	-1
Issuances of common stock, value	815
Stock-based compensation	11
Treasury stock, net, value	-1
BOP Stockholders' Equity Balance	3,893
Net income (loss)	-480
Other Comprehensive Income (Loss), Net of Tax	0
EOP Stockholders' Equity Balance	4,238
Common Stock
Issuances of common stock, shares	25,400,000
Issuances of common stock, value	1
Treasury Stock
Treasury stock, net, shares	-29,875
Treasury stock, net, value	-1
Additional Paid-in Capital
Issuances of common stock, value	814
Stock-based compensation	11
Treasury stock, net, value	0
Retained Earnings
Net income (loss)	($480)

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	($480)	$284
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	237	224
Deferred Income Tax Expense (Benefit), Continuing and Discontinuing Operations	-283	161
Stock-based compensation	15	11
Unrealized Gain (Loss) on Derivatives	-32	57
Ceiling test impairment	792	0
Gain on sale of malaysia	0	-388
Other non-cash charges	6	-4
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	38	51
(Increase) decrease in inventories	2	-6
Increase (Decrease) in Restricted Cash	-3	0
(Increase) decrease in other current assets	4	-7
(Increase) decrease in other assets	4	0
Increase (decrease) in accounts payable and accrued liabilities	-105	-6
Increase (decrease) in advances from joint owners	14	-13
Increase (decrease) in other liabilities	-4	1
Net cash provided by operating activities	205	365
Cash flows from investing activities:
Additions to oil and gas properties	-511	-553
Proceeds from sales of oil and gas properties	29	10
Proceeds from Divestiture of Businesses	0	809
Additions to furniture, fixtures and equipment	-4	-8
Redemptions of investments	0	39
Net cash used in investing activities	-486	297
Cash flows from financing activities:
Proceeds from borrowings under credit arrangements	701	562
Repayments of borrowings under credit arrangements	-1,147	-1,211
Proceeds from issuance of senior notes	691	0
Debt issue costs	-8	0
Proceeds from issuances of common stock	815	0
Purchases of treasury stock, net	-1	-1
Proceeds from (Payments for) Other Financing Activities	-1	0
Net cash provided by (used in) financing activities	1,050	-650
Increase (decrease) in cash and cash equivalents	769	12
Cash and cash equivalents, beginning of period	14	95
Cash and cash equivalents, end of period	$783	$107

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	Organization and Summary of Significant Accounting Policies:
	Organization and Principles of Consolidation
	We are an independent energy company engaged in the exploration, development and production of crude oil, natural gas and natural gas liquids (NGLs). Our principal domestic areas of operation include the Mid-Continent, the Rocky Mountains and the onshore Gulf Coast regions of the United States. In addition, we have offshore oil developments in China.
	Our consolidated financial statements include the accounts of Newfield Exploration Company, a Delaware corporation, and its subsidiaries. We proportionately consolidate our interests in oil and natural gas exploration and production ventures and partnerships in accordance with industry practice. All significant intercompany balances and transactions have been eliminated. Unless otherwise specified or the context otherwise requires, all references in these notes to “Newfield,” “we,” “us,” “our” or the “Company” are to Newfield Exploration Company and its subsidiaries.
	These unaudited consolidated financial statements reflect, in the opinion of our management, all adjustments, consisting only of normal and recurring adjustments, necessary to fairly state our financial position as of and results of operations for the periods presented. These financial statements have been prepared in accordance with the instructions to Form 10-Q and, therefore, do not include all disclosures required for financial statements prepared in conformity with accounting principles generally accepted in the United States of America. Interim period results are not necessarily indicative of results of operations or cash flows for a full year.
	These consolidated financial statements and notes should be read in conjunction with our audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2014.
	Discontinued Operations
	The results of our Malaysia operations are reflected separately as discontinued operations in the consolidated statement of operations on a line immediately after "Income (loss) from continuing operations." See Note 16, "Discontinued Operations," for additional disclosures, as well as information regarding the sale of our Malaysia business, which closed in February 2014.
	Risks and Uncertainties
	As an independent oil and natural gas producer, our revenue, profitability and future rate of growth are substantially dependent on prevailing prices for oil, natural gas and NGLs. Historically, the energy markets have been very volatile, and there can be no assurance that commodity prices will not be subject to wide fluctuations in the future. A substantial or extended decline in commodity prices could have a material adverse effect on our financial position, results of operations, cash flows, access to capital and on the quantities of oil, natural gas and NGL reserves that we can economically produce. It is possible for any of these effects to occur in the near term, given the recent decline in commodity pricing.
	Use of Estimates
	The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires our management to make estimates and assumptions that affect the reported amounts of assets and liabilities; disclosure of contingent assets and liabilities at the date of the financial statements; the reported amounts of revenues and expenses during the reporting period; and the quantities and values of proved oil, natural gas and NGL reserves used in calculating depletion and assessing impairment of our oil and gas properties. Actual results could differ significantly from these estimates. Our most significant estimates are associated with the quantities of proved oil, natural gas and NGL reserves, the timing and amount of transfers of our unevaluated properties into our amortizable full cost pool and the fair value of both our derivative positions and our stock-based compensation liability awards.
	Reclassifications
	Certain reclassifications have been made to prior years' reported amounts in order to conform to the current year presentation. These reclassifications did not impact our net income (loss), stockholders' equity or cash flows.
	Restricted Cash
	Restricted cash of $3 million on our consolidated balance sheet at March 31, 2015 represents amounts held in escrow accounts to satisfy plug and abandonment obligations for our China operations. These amounts are restricted as to their current use and will be released when we have satisfied all plugging and abandonment obligations in our China field. Consistent with our other plug and abandonment activities, changes in restricted cash is included in cash flows from operating activities in our consolidated statement of cash flows.
	Oil and Gas Properties
	We use the full cost method of accounting for our oil and gas producing activities. Under this method, all costs incurred in the acquisition, exploration and development of oil and gas properties, including salaries, benefits, interest and other internal costs directly attributable to these activities, are capitalized into cost centers that are established on a country-by-country basis. We capitalized approximately $32 million and $54 million of interest and direct internal costs during the three-month periods ended March 31, 2015 and 2014, respectively.
	Proceeds from the sale of oil and gas properties are applied to reduce the costs in the applicable cost center unless the reduction would significantly alter the relationship between capitalized costs and proved reserves, in which case a gain or loss is recognized.
	Capitalized costs and estimated future development costs are amortized using a unit-of-production method based on proved reserves associated with the applicable cost center. For each cost center, the net capitalized costs of oil and gas properties are limited to the lower of the unamortized cost or the cost center ceiling. A particular cost center ceiling is equal to the sum of:
	•	the present value (10% per annum discount rate) of estimated future net revenues from proved reserves using oil, natural gas and NGL reserve estimation requirements, which require use of the unweighted average first-day-of-the-month commodity prices for the prior 12 months, adjusted for market differentials (SEC pricing), applicable to our reserves (including the effects of hedging contracts that are designated for hedge accounting, if any); plus
	•	the cost of properties not included in the costs being amortized, if any; less
	•	related income tax effects.
	If net capitalized costs of oil and gas properties exceed the cost center ceiling, we are subject to a non-cash ceiling test writedown to the extent of such excess. If required, a ceiling test writedown reduces earnings and stockholders’ equity in the period of occurrence and, holding other factors constant, results in lower depreciation, depletion and amortization expense in future periods.
	The risk that we will be required to writedown the carrying value of our oil and gas properties increases when oil, natural gas and NGL prices decrease significantly for a prolonged period of time or if we have substantial downward revisions in our estimated proved reserves. At March 31, 2015, the ceiling value of our reserves was calculated based upon SEC pricing of $3.88 per MMBtu for natural gas and $82.60 per barrel for oil. Using these prices, our ceiling for the U.S. did not exceed the net capitalized costs of oil and gas properties resulting in a ceiling test writedown of approximately $788 million ($496 million after tax). The cost center ceiling with respect to the China full cost pool exceeded the net capitalized costs of oil and gas properties by approximately $200 million, net of tax, and as such, no ceiling test writedown was required.
	The continued decline of SEC pricing for oil and natural gas reserves since March 31, 2015 will likely result in a U.S. ceiling test writedown in the second quarter of 2015.
	New Accounting Requirements
	In April 2015, the Financial Accounting Standards Board (FASB) issued guidance regarding the presentation of debt issuance costs in the financial statements and requires that debt issuance costs be presented as a reduction of the carrying value of the financial liability and not as a separate asset. The guidance requires retrospective adjustment to the balance sheet presentation and disclosures applicable for a change in an accounting principle. The guidance is effective for interim and annual periods beginning after December 15, 2015. We expect to adopt this guidance on or before the effective date.
	In May 2014, the FASB issued guidance regarding the accounting for revenue from contracts with customers. The guidance may be applied retrospectively or using a modified retrospective approach to adjust retained earnings. The guidance is effective for interim and annual periods beginning on or after December 15, 2016. On April 1, 2015, the FASB proposed a deferral of the effective date by one year, which is not final until the FASB completes its due process requirements. We are currently evaluating the impact of this guidance on our financial statements.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share Text Block	Earnings Per Share:
	The following is the calculation of basic and diluted weighted-average shares outstanding and earnings per share (EPS) for the indicated periods:
			Three Months Ended
			March 31,
			2015			2014
			(In millions, except per share data)
	Income (numerator):
	Income (loss) from continuing operations		$	(480	)	$	27
	Income (loss) from discontinued operations		—			257
	Net income (loss)		$	(480	)	$	284
	Weighted-average shares (denominator):
	Weighted-average shares — basic		145			136
	Dilution effect of stock options and unvested restricted stock and restricted stock units outstanding at end of period(1)(2)		—			1
	Weighted-average shares — diluted		145			137
	Earnings (loss) per share:
	Basic:
	Income (loss) from continuing operations		$	(3.30	)	$	0.19
	Income (loss) from discontinued operations		—			1.89
	Basic earnings (loss) per share		$	(3.30	)	$	2.08
	Diluted:
	Income (loss) from continuing operations		$	(3.30	)	$	0.19
	Income (loss) from discontinued operations		—			1.88
	Diluted earnings (loss) per share		$	(3.30	)	$	2.07
	_______
	-1	The effect of 2.4 million unvested restricted stock or restricted stock units and stock options has not been included in the calculation of shares outstanding for diluted EPS for the quarter ended March 31, 2015, as their effect would have been anti-dilutive. Had we recognized income from continuing operations for the quarter, incremental shares attributable to the assumed vesting of unvested restricted stock and restricted stock units and the assumed exercise of outstanding stock options would have increased diluted weighted-average shares outstanding by 1.3 million shares for the three months ended March 31, 2015.
	-2	Excludes 1.5 million shares of unvested restricted stock or restricted stock units and stock options for the three months ended March 31, 2014, respectively, because including the effect would have been anti-dilutive.

Oil_and_Gas_Assets

Oil and Gas Assets	3 Months Ended
	Mar. 31, 2015
Oil and Gas Property [Abstract]
Oil and Gas Assets Text Block	.      Oil and Gas Assets:
	Property and Equipment
	Property and equipment consisted of the following:
		March 31,			December 31,
		2015			2014
		(In millions)
	Oil and gas properties:
	Subject to amortization	$	15,254		$	15,707
	Not subject to amortization	729			677
	Gross oil and gas properties	15,983			16,384
	Accumulated depreciation, depletion and amortization	(8,380		)	(8,152		)
	Net oil and gas properties	$	7,603		$	8,232
	Other property and equipment:
	Furniture, fixtures and equipment	$	143		$	144
	Gathering systems and equipment	115			114
	Accumulated depreciation and amortization	(82		)	(76		)
	Net other property and equipment	$	176		$	182
	Oil and gas properties not subject to amortization as of March 31, 2015, consisted of the following:
		Costs Incurred In
		2015			2014			2013		2012 and Prior		Total
		(In millions)
	Acquisition costs	$	41		$	182		$	158	$	91	$	472
	Exploration costs	78			82			—		—		160
	Fee mineral interests	—			—			1		23		24
	Capitalized interest	7			52			14		—		73
	Total oil and gas properties not subject to amortization	$	126		$	316		$	173	$	114	$	729
	Granite Wash Asset Sale
	In September 2014, we closed on the sale of our Granite Wash assets, located primarily in Texas, for approximately $588 million, subject to customary post-closing purchase price adjustments. The sale of our Granite Wash assets did not significantly alter the relationship between capitalized costs and proved reserves, and as such, all proceeds were recorded as adjustments to our domestic full cost pool with no gain or loss recognized. These consolidated financial statements include the results of our Granite Wash operations through the date of sale.

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedges, Assets [Abstract]
Derivative Financial Instruments Text Block	Derivative Financial Instruments:
	Commodity Derivative Instruments
	We utilize derivative strategies that consist of either a single derivative instrument or a combination of instruments to manage the variability in cash flows associated with the forecasted sale of our future domestic oil and natural gas production. While the use of derivative instruments may limit or partially reduce the downside risk of adverse commodity price movements, their use also may limit future income from favorable commodity price movements.
	In addition to the derivative strategies outlined in our Annual Report on Form 10-K for the year ended December 31, 2014, we also implemented a derivative strategy beginning in the first quarter of 2015 that is associated with our derivative positions for oil swaps with short puts that achieve maximum value once the market price falls below the short puts. During the first quarter of 2015, we purchased call options that effectively lock in the maximum value for a portion of our corresponding oil swaps with short puts. We elected to defer the premiums of $3 million related to these calls until contract settlement. Excluding the effect of the deferred premium, if the settlement price is above the call strike price, the counterparty is required to make a payment to us.
	Our oil and gas derivative contracts are settled based upon reported prices on the NYMEX. The estimated fair value of these contracts is based upon various factors, including closing exchange prices on the NYMEX, over-the-counter quotations, estimated volatility, non-performance risk adjustments using credit default swaps and time to maturity. The calculation of the fair value of options requires the use of an option-pricing model. See Note 9, “Fair Value Measurements.”
	At March 31, 2015, we had outstanding derivative positions as set forth in the tables below.
	Crude Oil
						NYMEX Contract Price Per Bbl
																Collars							Estimated Fair Value
	Period and Type of Instrument		Volume in MBbls			Swaps				Purchased Calls (Weighted Average)			Sold Puts			Floors				Ceilings			Asset (Liability)
						(Weighted Average)							(Weighted Average)(1)			(Weighted Average)				(Weighted Average)
																							(In millions)
	2015:00:00
	Fixed-price swaps		1,555			$	90			$	—		$	—		$	—			$	—		$	60
	Fixed-price swaps with sold puts:		11,554
	Fixed-price swaps					90				—			—			—				—			429
	Sold puts					—				—			71.57			—				—			(229		)
	Collars with sold puts:		550
	Collars					—				—			—			90				104			21
	Sold puts					—				—			75			—				—			(13		)
	2016:00:00
	Fixed-price swaps with sold puts:		10,060
	Fixed-price swaps					89.98				—			—			—				—			316
	Sold puts					—				—			74.14			—				—			(187		)
	Collars with sold puts:		6,220
	Collars					—				—			—			90				96.15			198
	Sold puts					—				—			75			—				—			(120		)
	Purchased calls		732			—				70			—			—				—			2
	2017:00:00
	Fixed-price swaps with sold puts:		4,468
	Fixed-price swaps					88.37				—			—			—				—			118
	Sold puts					—				—			73.28			—				—			(72		)
	Collars with sold puts:		2,080
	Collars					—				—			—			90				95.59			61
	Sold puts					—				—			75			—				—			(37		)
	Total																						$	547
	_________________
	-1	If the market prices remain below our sold puts at contract settlement, we will receive the market price plus the following associated with our production:
	•	the difference between our floors and our sold puts for collars with sold puts; or
	•	the difference between our swaps and our sold puts for fixed-price swaps with sold puts.
	Natural Gas
						NYMEX Contract Price Per MMBtu
													Collars							Estimated Fair Value Asset (Liability)
	Period and Type of Instrument		Volume in MMMBtus			Swaps (Weighted Average)				Sold Puts (Weighted Average)			Floors (Weighted Average)			Ceilings (Weighted Average)
																				(In millions)
	2015:00:00
	Fixed-price swaps		37,125			$	4.28			$	—		$	—		$	—			$	55
	Collars		28,875			—				—			3.93			4.74				34
	2016:00:00
	Swaptions(1)		—			4.1				—			—			—				—
	Collars		10,980			—				—			4			4.54				10
	Total																			$	99
	________
	-1	During the fourth quarter of 2014, we sold natural gas swaption contracts that, if exercised on their expiration date in the second quarter of 2015, would protect 14,640 MMMBtus of calendar-year 2016 production from future commodity price volatility. These contracts give the counterparties the option to enter into swap contracts with us at $4.10/MMBtu for calendar-year 2016.
	Additional Disclosures about Derivative Financial Instruments
	We had derivative financial instruments recorded in our consolidated balance sheet as assets (liabilities) at their respective estimated fair value, as set forth below.
			Derivative Assets														Derivative Liabilities
			Gross Fair Value				Offset in Balance Sheet				Balance Sheet Location						Gross Fair Value				Offset in Balance Sheet			Balance Sheet Location
											Current			Noncurrent										Current			Noncurrent
			(In millions)														(In millions)
	March 31, 2015
	Natural gas positions		$	99			$	—			$	91		$	8		$	—			$	—		$	—		$	—
	Oil positions		1,145				(595		)		334			216			(598		)		595			(1		)	(2		)
	Total		$	1,244			$	(595	)		$	425		$	224		$	(598	)		$	595		$	(1	)	$	(2	)
December 31, 2014
Natural gas positions		$	105			$	(2	)		$	99		$	4		$	(2	)		$	2		$	—		$	—
Oil positions		1,115				(597		)		332			186			(605		)		597			(8		)	—
Total		$	1,220			$	(599	)		$	431		$	190		$	(607	)		$	599		$	(8	)	$	—
The amount of gain (loss) recognized in “Commodity derivative income (expense)” in our consolidated statement of operations related to our derivative financial instruments follows:
		Three Months Ended
		March 31,
		2015				2014
		(In millions)
Derivatives not designated as hedging instruments:
Realized gain (loss) on natural gas positions		$	25			$	(22	)
Realized gain (loss) on oil positions		96				(17		)
Total realized gain (loss)		121				(39		)
Unrealized gain (loss) on natural gas positions		(5		)		(17		)
Unrealized gain (loss) on oil positions		37				(40		)
Total unrealized gain (loss)		32				(57		)
Total		$	153			$	(96	)
The use of derivative transactions involves the risk that the counterparties, which generally are financial institutions, will be unable to meet the financial terms of such transactions. Our derivative contracts are with multiple counterparties to minimize our exposure to any individual counterparty, and we have netting arrangements with all of our counterparties that provide for offsetting payables against receivables from separate derivative instruments with that counterparty. At March 31, 2015, ten of our 16 counterparties accounted for approximately 85% of our contracted volumes, with no single counterparty accounting for more than 15%.
Approximately 72% of our volumes subject to derivative instruments are with lenders under our credit facility. Our credit facility, senior notes and substantially all of our derivative instruments contain provisions that provide for cross defaults and acceleration of those debt and derivative instruments in certain situations.

Accounts_Receivable

Accounts Receivable	3 Months Ended
	Mar. 31, 2015
Accounts Receivable, Net, Current [Abstract]
Accounts Receivable Text Block	Accounts Receivable:
	Accounts receivable consisted of the following:
		March 31,			December 31,
		2015			2014
		(In millions)
	Revenue	$	102		$	155
	Joint interest	200			230
	Other	68			70
	Reserve for doubtful accounts	(16		)	(16		)
	Total accounts receivable, net	$	354		$	439
	Reserve for doubtful accounts includes an allowance for $15 million related to discontinued operations. See Note 16, "Discontinued Operations."

Accrued_Liabilities

Accrued Liabilities	3 Months Ended
	Mar. 31, 2015
Accrued Liabilities, Current [Abstract]
Accrued Liabilities Text Block	Accrued Liabilities:
	Accrued liabilities consisted of the following:
		March 31,		December 31,
		2015		2014
		(In millions)
	Revenue payable	$	139	$	197
	Accrued capital costs	293		441
	Accrued lease operating expenses	41		47
	Employee incentive expense	28		62
	Accrued interest on debt	32		67
	Taxes payable	39		32
	Other	34		34
	Total accrued liabilities	$	606	$	880

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements Text Block	Fair Value Measurements:
	Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The authoritative guidance requires disclosure of the framework for measuring fair value and requires that fair value measurements be classified and disclosed in one of the following categories:
	Level 1:	Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. We consider active markets as those in which transactions for the assets or liabilities occur with sufficient frequency and volume to provide pricing information on an ongoing basis.
	Level 2:	Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability. This category includes those derivative instruments that we value using observable market data. Substantially all of these inputs are observable in the marketplace throughout the full term of the derivative instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. Instruments in this category include non-exchange traded derivatives such as over-the-counter commodity fixed-price swaps and certain investments.
	Level 3:	Measured based on prices or valuation models that require inputs that are both significant to the fair value measurement and less observable from objective sources (i.e., supported by little or no market activity). Level 3 instruments primarily include derivative instruments, such as commodity options (i.e., price collars, sold puts or swaptions) and other financial investments.
	•	Our valuation models for derivative contracts are primarily industry-standard models (i.e., Black-Scholes) that consider various inputs including: (a) forward prices for commodities, (b) time value, (c) volatility factors, (d) counterparty credit risk and (e) current market and contractual prices for the underlying instruments.
	•	Our valuation model for the Stockholder Value Appreciation Program (SVAP) is a Monte Carlo simulation that is based on a probability model and considers various inputs including: (a) the measurement date stock price, (b) time value and (c) historical and implied volatility. See Note 12, “Stock-Based Compensation,” for a description of the SVAP.
	Financial assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of the fair value of assets and liabilities and their placement within the fair value hierarchy.
	Recurring Fair Value Measurements
	The following table summarizes the valuation of our assets and liabilities that are measured at fair value on a recurring basis.
			Fair Value Measurement Classification
			Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)				Total
			(In millions)
	As of December 31, 2014:
	Money market fund investments		$	1		$	—		$	—			$	1
	Deferred compensation plan assets		9			—			—				9
	Equity securities available-for-sale		10			—			—				10
	Oil and gas derivative swap contracts		—			994			—				994
	Oil and gas derivative option and swaption contracts		—			—			(381		)		(381		)
	Stock-based compensation liability awards		(12		)	—			(3		)		(15		)
	Total		$	8		$	994		$	(384	)		$	618
	As of March 31, 2015:
	Money market fund investments		$	768		$	—		$	—			$	768
	Deferred compensation plan assets		5			—			—				5
	Equity securities available-for-sale		9			—			—				9
	Oil and gas derivative swap contracts		—			978			—				978
	Oil and gas derivative option and swaption contracts		—			—			(332		)		(332		)
	Stock-based compensation liability awards		(19		)	—			(8		)		(27		)
	Total		$	763		$	978		$	(340	)		$	1,401
	The determination of the fair values above incorporates various factors, which include not only the impact of our non-performance risk on our liabilities but also the credit standing of the counterparties involved and the impact of credit enhancements (such as cash deposits, letters of credit and priority interests), if any. We utilize credit default swap values to assess the impact of non-performance risk when evaluating both our liabilities to and receivables from counterparties.
	Level 3 Fair Value Measurements
	The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the indicated periods.
			Investments			Derivatives			Stock-Based Compensation				Total
			(In millions)
	Balance at January 1, 2014		$	39		$	(8	)	$	(5	)		$	26
	Realized or unrealized gains (losses) included in earnings		—			(13		)	(14		)		(27		)
	Purchases, issuances, sales and settlements:
	Sales		(39		)	—			—				(39		)
	Settlements		—			2			—				2
	Transfers in to Level 3		—			—			—				—
	Transfers out of Level 3		—			—			—				—
	Balance at March 31, 2014		$	—		$	(19	)	$	(19	)		$	(38	)
	Change in unrealized gains or losses included in earnings relating to Level 3 instruments still held at March 31, 2014		$	—		$	(11	)	$	(14	)		$	(25	)
	Balance at January 1, 2015		$	—		$	(381	)	$	(3	)		$	(384	)
	Realized or unrealized gains (losses) included in earnings		—			(21		)	(5		)		(26		)
	Purchases, issuances, sales and settlements:
	Settlements		—			70			—				70
	Transfers in to Level 3		—			—			—				—
	Transfers out of Level 3		—			—			—				—
	Balance at March 31, 2015		$	—		$	(332	)	$	(8	)		$	(340	)
	Change in unrealized gains or losses included in earnings relating to Level 3 instruments still held at March 31, 2015		$	—		$	(4	)	$	(5	)		$	(9	)
	Qualitative Disclosures about Unobservable Inputs for Level 3 Fair Value Measurements
	Investments.   During the first quarter of 2014, all auction rate securities that we held as of January 1, 2014, were sold for $39 million.
	Derivatives.  Our valuation models for Level 3 derivative contracts are primarily industry-standard models that consider various factors, including certain significant unobservable inputs such as volatility factors and counterparty credit risk. The calculation of the fair value of our option contracts requires the use of an option-pricing model. The estimated future prices are compared to the strike prices fixed by our derivative contracts, and the resulting estimated future cash inflows or outflows over the contractual life are discounted to calculate the fair value. These pricing and discounting variables are sensitive to market volatility as well as changes in future price forecasts, regional price differences and interest rates. Significant increases (decreases) in the quoted forward prices for commodities generally lead to corresponding decreases (increases) in the fair value measurement of our oil and gas derivative contracts. Significant changes in the volatility factors utilized in our option-pricing model can cause significant changes in the fair value measurement of our oil and gas derivative contracts. See Note 6, "Derivative Financial Instruments," for additional discussion of our derivative instruments.
	The determination of the fair values of derivative instruments incorporates various factors that include not only the impact of our non-performance risk on our liabilities but also the credit standing of the counterparties involved and the impact of credit enhancements (such as cash deposits, letters of credit and priority interests). Historically, we have not experienced significant changes in the fair value of our derivative contracts resulting from changes in counterparty credit risk as the counterparties for all of our derivative transactions have an “investment grade” credit rating.
	Stock-Based Compensation. The calculation of the fair value of the SVAP liability requires the use of a probability-based Monte Carlo simulation, which includes unobservable inputs. The simulation predicts multiple scenarios of future stock returns over the performance period, which are discounted to calculate the fair value. The fair value is recognized over a service period derived from the simulation. Future stock returns and discounting variables are sensitive to market volatility. Significant increases (decreases) in the volatility factors utilized in our option-pricing model can cause significant increases (decreases) in the fair value measurement of the SVAP liability.
	Quantitative Disclosures about Unobservable Inputs for Level 3 Fair Value Measurements
			Estimated Fair Value Asset (Liability)			Quantitative Information about Level 3 Fair Value Measurements
	Instrument Type					Valuation Technique		Unobservable Input	Range
			(In millions)
	Oil option contracts		$	(376	)	Black-Scholes		Oil price volatility	21.39	%		—		68.99	%
								Credit risk	0.01	%		—		2.1	%
	Natural gas option and swaption contracts		$	44		Black-Scholes		Natural gas price volatility	23.44	%		—		54.28	%
								Credit risk	0.01	%		—		1.36	%
SVAP		$	(8	)	Monte Carlo		Implied volatility						46.7	%
Fair Value of Debt
The estimated fair value of our notes, based on quoted prices in active markets (Level 1) as of the indicated dates, was as follows:
		March 31,			December 31,
		2015			2014
		(In millions)
5¾% Senior Notes due 2022		$	789		$	772
5⅝% Senior Notes due 2024		1,041			989
5⅜% Senior Notes due 2026		709			—
6⅞% Senior Subordinated Notes due 2020		725			721
Any amounts outstanding under our credit arrangements as of the indicated dates are stated at cost, which approximates fair value. Please see Note 10, “Debt.”

Debt

Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt Text Block	Debt:
	Our debt consisted of the following:
		March 31,			December 31,
		2015			2014
		(In millions)
	Senior unsecured debt:
	Revolving credit facility — LIBOR based loans	$	—		$	345
	Money market lines of credit(1)	—			101
	Total credit arrangements	—			446
	5¾% Senior Notes due 2022	750			750
	5⅝% Senior Notes due 2024	1,000			1,000
	5⅜% Senior Notes due 2026	700			—
	Total senior unsecured debt	2,450			2,196
	6⅞% Senior Subordinated Notes due 2020	700			700
	Discount on notes	(4		)	(4		)
	Total long-term debt	$	3,146		$	2,892
	________
	(1) Because we have the ability and intent to use our available credit facility to repay borrowings under our money market lines of credit as of the indicated dates, amounts outstanding under these obligations, if any, are classified as long-term.
	Credit Arrangements
	In March 2015, we entered into the fourth amendment to our Credit Agreement. This amendment extended the maturity date of the revolving credit facility from June 2018 to June 2020 and increased the borrowing capacity from $1.4 billion to $1.8 billion. We incurred $7 million of deferred financing costs related to this amendment, which will be amortized through June 2020. As of March 31, 2015, the largest individual loan commitment by any lender was 12% of total commitments.
	Loans under the credit facility bear interest, at our option, equal to (a) a rate per annum equal to the higher of the prime rate announced from time to time by JPMorgan Chase Bank, N.A. or the weighted average of the rates on overnight federal funds transactions with members of the Federal Reserve System during the last preceding business day plus 50 basis points, plus a margin that is based on a grid of our debt rating (75 basis points per annum at March 31, 2015) or (b) the London Interbank Offered Rate, plus a margin that is based on a grid of our debt rating (175 basis points per annum at March 31, 2015).
	Under our credit facility, we pay commitment fees on available but undrawn amounts based on a grid of our debt rating (30 basis points per annum at March 31, 2015). We incurred aggregate commitment fees under our current credit facility of approximately $1 million for each of the three-month periods ended March 31, 2015 and 2014, which are recorded in “Interest expense” on our consolidated statement of operations.
	Our credit facility has restrictive financial covenants that include the maintenance of a ratio of total debt to book capitalization not to exceed 0.6 to 1.0 and maintenance of a ratio of earnings before gain or loss on the disposition of assets, interest expense, income taxes and noncash items (such as depreciation, depletion and amortization expense, unrealized gains and losses on commodity derivatives, ceiling test writedowns and goodwill impairments) to interest expense of at least 3.0 to 1.0. At March 31, 2015, we were in compliance with all of our debt covenants.
	As of March 31, 2015, we had no letters of credit outstanding under our credit facility. Letters of credit are subject to a fronting fee of 20 basis points and annual fees based on a grid of our debt rating (175 basis points at March 31, 2015).
	Subject to compliance with the restrictive covenants in our credit facility, at March 31, 2015, we also had a total of $195 million of available borrowing capacity under our money market lines of credit with various financial institutions, the availability of which is at the discretion of the financial institutions.
	The credit facility includes events of default relating to customary matters, including, among other things, nonpayment of principal, interest or other amounts; violation of covenants; inaccuracy of representations and warranties in any material respect; a change of control; or certain other material adverse changes in our business. Our senior notes and senior subordinated notes also contain standard events of default. If any of the foregoing defaults were to occur, our lenders under the credit facility could terminate future lending commitments, and our lenders under both the credit facility and our notes could declare the outstanding borrowings due and payable. In addition, our credit facility, senior notes, senior subordinated notes and substantially all of our derivative arrangements contain provisions that provide for cross defaults and acceleration of those debt and derivative instruments in certain situations.
	Senior Notes and Senior Subordinated Notes
	On March 5, 2015, we issued $700 million of 5⅜% Senior Notes due 2026 and received net proceeds of approximately $690 million (net of offering costs of approximately $10 million). These notes were issued at par to yield 5⅜%. Also in March 2015, we called our outstanding 6⅞% Senior Subordinated Notes due 2020. See Note 17, "Subsequent Events."

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes Text Block	Income Taxes:
	The provision (benefit) for income taxes for continuing operations for the indicated periods was different than the amount computed using the federal statutory rate (35%) for the following reasons:
		Three Months Ended
		March 31,
		2015			2014
		(In millions)
	Amount computed using the statutory rate	$	(266	)	$	17
	Increase (decrease) in taxes resulting from:
	State and local income taxes, net of federal effect	(17		)	2
	Foreign tax on foreign earnings	2			2
	Other	1			2
	Total provision (benefit) for income taxes	$	(280	)	$	23
	The effective tax rates for continuing operations for the three months ended March 31, 2015 and 2014 were 36.8% and 46.8%, respectively. Unrealized derivative gains and losses are treated differently for income tax purposes in the various state taxing jurisdictions to which we are subject. As a result, our effective tax rate fluctuates in periods with significant commodity price volatility.
	As of March 31, 2015, we did not have a liability for uncertain tax positions, and as such, we had not accrued related interest or penalties. The tax years 2011 through 2014 remain open to examination for federal income tax purposes and by the other major taxing jurisdictions to which we are subject.

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2015
Share-based Compensation [Abstract]
Stock-Based Compensation Text Block	Stock-Based Compensation:
	Our stock-based compensation consisted of the following:
		Three Months Ended
		March 31,
		2015				2014
		(In millions)
	Equity awards	$	10			$	11
	Liability awards:
	Stockholder Value Appreciation Program	5				14
	Cash-settled restricted stock units	7				6
	Total liability awards	12				20
	Total stock-based compensation	22				31
	Capitalized in oil and gas properties	(7		)		(14		)
	Net stock-based compensation expense	$	15			$	17
	As of March 31, 2015, we had approximately $79 million of total unrecognized stock-based compensation expense related to unvested stock-based compensation awards that vest within four years.
	Equity Awards
	Equity awards consist of service-based and performance- or market-based restricted stock units, stock options and stock purchase options under the Employee Stock Purchase Plan.
	Stock-based compensation classified as equity awards to employees and non-employee directors are currently granted under the 2011 Omnibus Stock Plan (2011 Plan). The fair value of grants is determined utilizing the Black-Scholes option-pricing model for stock options and a Monte Carlo lattice-based model for our performance- and market-based restricted stock and restricted stock units. Compensation expense for equity awards is expected to be recognized on a straight-line basis over the applicable remaining vesting periods.
	Restricted Stock. The following table provides information about restricted stock and restricted stock unit activity.
		Service-Based			Performance/			Total		Weighted- Average Grant Date Fair Value per Share
		Shares			Market-Based			Shares
					Shares
		(In thousands, except per share data)
	Non-vested shares outstanding at January 1, 2015	1,902			945			2,847		$	30.05
	Granted	221			414			635		25.12
	Forfeited	(171	)		—			(171	)	22.63
	Vested	(53	)		(40	)		(93	)	44.47
	Non-vested shares outstanding at March 31, 2015	1,899			1,319			3,218		$	28.62
	On March 31, 2015, the last reported sales price of our common stock on the New York Stock Exchange was $35.09 per share.
	Employee Stock Purchase Plan. On January 1, 2015, options to purchase approximately 100,000 shares of our common stock were granted under our employee stock purchase plan (ESPP). The weighted-average fair value of each option was $7.93 per share. The fair value of the options granted was determined using the Black-Scholes option valuation method assuming no dividends, a risk-free weighted-average interest rate of 0.12%, an expected life of six months and weighted-average volatility of 52%.
	Stock Options. As of March 31, 2015, we had approximately 200,000 stock options outstanding and exercisable. No stock options have been granted since 2008, except for the ESPP options discussed above.
	Liability Awards
	Liability awards consist of performance awards that are settled in cash instead of shares, as discussed below.
	Stockholder Value Appreciation Program. In September 2013, the Compensation and Management Development Committee of the Board approved the SVAP to be administered under the 2011 Plan. The SVAP pays substantially all full-time domestic, nonexecutive employees a cash payment based on a percentage of salary upon each incremental $5 increase in our 30-calendar day average share price. Each price threshold can be reached only once during the term of the program. The SVAP's performance period lasts through December 31, 2015. Each price trigger, if any, that is reached during 2015 would result in an approximately $11 million payment.
	The first price threshold that triggered a payment under the SVAP was $27.50 during the fourth quarter of 2013. The second and third price thresholds for the SVAP were $32.50 and $37.50, respectively, which were reached during the second quarter of 2014. The fourth price threshold for the SVAP of $42.50 was reached in July 2014. Each of the first four payments were approximately $13 million.
	Based on the valuation of the SVAP as of March 31, 2015, the fair value was $10 million, of which $8 million has been accrued. The total expected cost was determined using a Monte Carlo simulation assuming no dividends, a risk-free weighted-average interest rate of 0.22%, a plan term of 0.75 years and an average of implied and historical stock price volatility of 51%. An additional $2 million is expected to be recognized over the remaining service period of the plan. Future changes in our stock price could cause the total cost of the plan to be different than our estimates as of March 31, 2015.
	Cash-Settled Restricted Stock Units. We also have granted cash-settled restricted stock units to employees that vest over three years. As of March 31, 2015, we accrued $19 million for future cash settlement upon vesting of awards. The value of the awards, and the associated stock-based compensation expense, is based on the Company’s stock price at the end of each period. During the quarter ended March 31, 2015, we granted approximately 200,000 cash-settled restricted stock units to employees. During the three months ended March 31, 2015, approximately 2,000 cash-settled restricted stock units vested and settled. During the three months ended March 31, 2014, approximately 283,000 cash-settled restricted stock units vested and settled for approximately $7 million. As of March 31, 2015, we had approximately 1.3 million cash-settled restricted stock units outstanding and related unrecognized stock-based compensation expense of approximately $22 million.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Text Block	Commitments and Contingencies:
	We have been named as a defendant in a number of lawsuits and are involved in various other disputes, all arising in the ordinary course of our business, such as (a) claims from royalty owners for disputed royalty payments, (b) commercial disputes, (c) personal injury claims and (d) property damage claims. Although the outcome of these lawsuits and disputes cannot be predicted with certainty, we do not expect these matters to have a material adverse effect on our financial position, cash flows or results of operations.

Supplemental_Cash_Flows_Inform

Supplemental Cash Flows Information	3 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flows Information Text Block	Supplemental Cash Flow Information:
	The following table presents information about supplemental cash flows for the indicated periods.
		Three Months Ended
		March 31,
		2015		2014
		(In millions)
	Non-cash investing and financing activities excluded from the statement of cash flows:
	(Increase) decrease in receivables for property sales	$	7	$	—
	(Increase) decrease in accrued capital expenditures	109		90
	(Increase) decrease in asset retirement costs	3		13

Discontinued_Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	Discontinued Operations:
	In 2013, we met the criteria to classify our Malaysia business as held for sale and discontinued operations. In February 2014, Newfield International Holdings Inc., a wholly-owned subsidiary of the Company, closed the sale of our Malaysia business to SapuraKencana Petroleum Berhad (SapuraKencana), a Malaysian public company, for $898 million. As a result of the sale, we recorded a gain in the first quarter of 2014 of approximately $388 million ($252 million, after tax). As of the date of this report, we have initiated a notice of dispute related to the final post-close settlement, which could result in arbitration proceedings. In the fourth quarter of 2014, we recorded an allowance against a receivable from SapuraKencana and reduced the previously recognized gain by $15 million ($10 million, after tax) due to uncertainty associated with collectability. As a result of the sale of our Malaysia business, there are no other assets and liabilities in the consolidated balance sheet attributable to discontinued operations as of December 31, 2014 or March 31, 2015.
	Results of Discontinued Operations
		Three Months Ended
		March 31,
		2014
		(In millions)
	Oil and gas revenues	$	90
	Operating expenses	69
	Income (loss) from discontinued operations	21
	Gain on sale of Malaysia business	388
	Income from discontinued operations before income taxes	409
	Income tax provision (benefit):
	Current	12
	Deferred	140
	Total income tax provision (benefit)	152
	Income (loss) from discontinued operations, net of tax	$	257

Inventories_Notes

Inventories (Notes)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventory Disclosure [Text Block]	Inventories:
	At March 31, 2015, the crude oil inventory from our China operations consisted of approximately 144,000 barrels of crude oil valued at cost of approximately $5 million. At December 31, 2014, the crude oil inventory from our China operations consisted of approximately 240,000 barrels of crude oil valued at cost of approximately $8 million and is included under the caption "Inventories" on our consolidated balance sheet. Cost for purposes of the carrying value of oil inventory is the sum of related production costs and depletion expense.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015									Mar. 31, 2014
Segment Reporting [Abstract]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
		Domestic			China		Total				Domestic		China		Total
		(In millions)									(In millions)
	Three Months Ended March 31, 2015:									Three Months Ended March 31, 2014:
	Oil, gas and NGL revenues	$	303		$	46	$	349		Oil, gas and NGL revenues	$	553	$	18	$	571
	Operating expenses:									Operating expenses:
	Lease operating	65			10		75			Lease operating	72		2		74
	Transportation and processing	49			—		49			Transportation and processing	37		—		37
	Production and other taxes	13			—		13			Production and other taxes	25		3		28
	Depreciation, depletion and amortization	212			25		237			Depreciation, depletion and amortization	188		4		192
	General and administrative	61			2		63			General and administrative	56		—		56
	Ceiling test and other impairments	792			—		792			Other	2		—		2
	Other	3			1		4			Allocated income tax (benefit)	64		5
	Allocated income tax (benefit)	(330		)	5					Net income (loss) from oil and gas properties	$	109	$	4
	Net income (loss) from oil and gas properties	$	(562	)	$	3				Total operating expenses					389
	Total operating expenses						1,233			Income (loss) from continuing operations					182
	Income (loss) from continuing operations						(884		)	Interest expense, net of interest income, capitalized interest and other					(36		)
	Interest expense, net of interest income, capitalized interest and other						(29		)	Commodity derivative income (expense)					(96		)
	Commodity derivative income (expense)						153			Income (loss) from continuing operations before income taxes					$	50
	Income (loss) from continuing operations before income taxes						$	(760	)	Total assets	$	8,080	$	571	$	8,651
	Total assets	$	9,005		$	673	$	9,678
										Additions to long-lived assets	$	438	$	17	$	455
	Additions to long-lived assets	$	396		$	12	$	408
Segment Reporting Disclosure [Text Block]	Segment Information
	While we only have operations in the oil and gas exploration and production industry, we are organizationally structured along geographic operating segments. Our current operating segments are the United States and China. The accounting policies of each of our operating segments are the same as those described in Note 1, “Organization and Summary of Significant Accounting Policies.”
	The following tables provide the geographic operating segment information for our continuing operations for the three-month periods ended March 31, 2015 and 2014. Income tax allocations have been determined based on statutory rates in the applicable geographic segment. In order to reflect the double taxation of our earnings and profits in China, we have applied the statutory rates for China and the U.S. to determine our income tax allocation for our China operations in the following tables.
		Domestic			China		Total
		(In millions)
	Three Months Ended March 31, 2015:
	Oil, gas and NGL revenues	$	303		$	46	$	349
	Operating expenses:
	Lease operating	65			10		75
	Transportation and processing	49			—		49
	Production and other taxes	13			—		13
	Depreciation, depletion and amortization	212			25		237
	General and administrative	61			2		63
	Ceiling test and other impairments	792			—		792
	Other	3			1		4
	Allocated income tax (benefit)	(330		)	5
	Net income (loss) from oil and gas properties	$	(562	)	$	3
	Total operating expenses						1,233
	Income (loss) from continuing operations						(884		)
	Interest expense, net of interest income, capitalized interest and other						(29		)
	Commodity derivative income (expense)						153
	Income (loss) from continuing operations before income taxes						$	(760	)
	Total assets	$	9,005		$	673	$	9,678
	Additions to long-lived assets	$	396		$	12	$	408
		Domestic			China		Total
		(In millions)
	Three Months Ended March 31, 2014:
	Oil, gas and NGL revenues	$	553		$	18	$	571
	Operating expenses:
	Lease operating	72			2		74
	Transportation and processing	37			—		37
	Production and other taxes	25			3		28
	Depreciation, depletion and amortization	188			4		192
	General and administrative	56			—		56
	Other	2			—		2
	Allocated income tax (benefit)	64			5
	Net income (loss) from oil and gas properties	$	109		$	4
	Total operating expenses						389
	Income (loss) from continuing operations						182
	Interest expense, net of interest income, capitalized interest and other						(36		)
	Commodity derivative income (expense)						(96		)
	Income (loss) from continuing operations before income taxes						$	50
	Total assets	$	8,080		$	571	$	8,651
	Additions to long-lived assets	$	438		$	17	$	455

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events:
	In April 2015, we completed the redemption of our $700 million aggregate principal of 6⅞% Senior Subordinated Notes due 2020. The transaction included a premium payment of approximately $24 million.
	On April 29, 2015, we announced plans to combine our Onshore Gulf Coast and Rocky Mountain business units into one operating region to be located in The Woodlands, Texas. We plan to close our Denver, Colorado office in August of 2015 and our North Houston (Greenspoint area) office on or before April of 2016 to improve cost efficiencies in operations.

Equity_Offering_Notes

Equity Offering (Notes)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
CommonStock [Text Block]	Equity Offering:
	During the first quarter of 2015, we issued 25.3 million additional shares of common stock through a public equity offering. We received proceeds of approximately $815 million, which were used primarily to repay all borrowings under our credit facility and money market lines of credit.

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Organization and Principles of Consolidation	Organization and Principles of Consolidation
	We are an independent energy company engaged in the exploration, development and production of crude oil, natural gas and natural gas liquids (NGLs). Our principal domestic areas of operation include the Mid-Continent, the Rocky Mountains and the onshore Gulf Coast regions of the United States. In addition, we have offshore oil developments in China.
	Our consolidated financial statements include the accounts of Newfield Exploration Company, a Delaware corporation, and its subsidiaries. We proportionately consolidate our interests in oil and natural gas exploration and production ventures and partnerships in accordance with industry practice. All significant intercompany balances and transactions have been eliminated. Unless otherwise specified or the context otherwise requires, all references in these notes to “Newfield,” “we,” “us,” “our” or the “Company” are to Newfield Exploration Company and its subsidiaries.
	These unaudited consolidated financial statements reflect, in the opinion of our management, all adjustments, consisting only of normal and recurring adjustments, necessary to fairly state our financial position as of and results of operations for the periods presented. These financial statements have been prepared in accordance with the instructions to Form 10-Q and, therefore, do not include all disclosures required for financial statements prepared in conformity with accounting principles generally accepted in the United States of America. Interim period results are not necessarily indicative of results of operations or cash flows for a full year.
	These consolidated financial statements and notes should be read in conjunction with our audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2014.
Discontinued Operations, Policy [Policy Text Block]	Discontinued Operations
	The results of our Malaysia operations are reflected separately as discontinued operations in the consolidated statement of operations on a line immediately after "Income (loss) from continuing operations." See Note 16, "Discontinued Operations," for additional disclosures, as well as information regarding the sale of our Malaysia business, which closed in February 2014.
Dependence on Oil and Gas Prices	Risks and Uncertainties
	As an independent oil and natural gas producer, our revenue, profitability and future rate of growth are substantially dependent on prevailing prices for oil, natural gas and NGLs. Historically, the energy markets have been very volatile, and there can be no assurance that commodity prices will not be subject to wide fluctuations in the future. A substantial or extended decline in commodity prices could have a material adverse effect on our financial position, results of operations, cash flows, access to capital and on the quantities of oil, natural gas and NGL reserves that we can economically produce. It is possible for any of these effects to occur in the near term, given the recent decline in commodity pricing.
Use of Estimates	Use of Estimates
	The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires our management to make estimates and assumptions that affect the reported amounts of assets and liabilities; disclosure of contingent assets and liabilities at the date of the financial statements; the reported amounts of revenues and expenses during the reporting period; and the quantities and values of proved oil, natural gas and NGL reserves used in calculating depletion and assessing impairment of our oil and gas properties. Actual results could differ significantly from these estimates. Our most significant estimates are associated with the quantities of proved oil, natural gas and NGL reserves, the timing and amount of transfers of our unevaluated properties into our amortizable full cost pool and the fair value of both our derivative positions and our stock-based compensation liability awards.
Reclassifications	Reclassifications
	Certain reclassifications have been made to prior years' reported amounts in order to conform to the current year presentation. These reclassifications did not impact our net income (loss), stockholders' equity or cash flows.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Restricted Cash
	Restricted cash of $3 million on our consolidated balance sheet at March 31, 2015 represents amounts held in escrow accounts to satisfy plug and abandonment obligations for our China operations. These amounts are restricted as to their current use and will be released when we have satisfied all plugging and abandonment obligations in our China field. Consistent with our other plug and abandonment activities, changes in restricted cash is included in cash flows from operating activities in our consolidated statement of cash flows.
Oil and Gas Properties	Oil and Gas Properties
	We use the full cost method of accounting for our oil and gas producing activities. Under this method, all costs incurred in the acquisition, exploration and development of oil and gas properties, including salaries, benefits, interest and other internal costs directly attributable to these activities, are capitalized into cost centers that are established on a country-by-country basis. We capitalized approximately $32 million and $54 million of interest and direct internal costs during the three-month periods ended March 31, 2015 and 2014, respectively.
	Proceeds from the sale of oil and gas properties are applied to reduce the costs in the applicable cost center unless the reduction would significantly alter the relationship between capitalized costs and proved reserves, in which case a gain or loss is recognized.
	Capitalized costs and estimated future development costs are amortized using a unit-of-production method based on proved reserves associated with the applicable cost center. For each cost center, the net capitalized costs of oil and gas properties are limited to the lower of the unamortized cost or the cost center ceiling. A particular cost center ceiling is equal to the sum of:
	•	the present value (10% per annum discount rate) of estimated future net revenues from proved reserves using oil, natural gas and NGL reserve estimation requirements, which require use of the unweighted average first-day-of-the-month commodity prices for the prior 12 months, adjusted for market differentials (SEC pricing), applicable to our reserves (including the effects of hedging contracts that are designated for hedge accounting, if any); plus
	•	the cost of properties not included in the costs being amortized, if any; less
	•	related income tax effects.
	If net capitalized costs of oil and gas properties exceed the cost center ceiling, we are subject to a non-cash ceiling test writedown to the extent of such excess. If required, a ceiling test writedown reduces earnings and stockholders’ equity in the period of occurrence and, holding other factors constant, results in lower depreciation, depletion and amortization expense in future periods.
	The risk that we will be required to writedown the carrying value of our oil and gas properties increases when oil, natural gas and NGL prices decrease significantly for a prolonged period of time or if we have substantial downward revisions in our estimated proved reserves. At March 31, 2015, the ceiling value of our reserves was calculated based upon SEC pricing of $3.88 per MMBtu for natural gas and $82.60 per barrel for oil. Using these prices, our ceiling for the U.S. did not exceed the net capitalized costs of oil and gas properties resulting in a ceiling test writedown of approximately $788 million ($496 million after tax). The cost center ceiling with respect to the China full cost pool exceeded the net capitalized costs of oil and gas properties by approximately $200 million, net of tax, and as such, no ceiling test writedown was required.
	The continued decline of SEC pricing for oil and natural gas reserves since March 31, 2015 will likely result in a U.S. ceiling test writedown in the second quarter of 2015.
New Accounting Requirements	New Accounting Requirements
	In April 2015, the Financial Accounting Standards Board (FASB) issued guidance regarding the presentation of debt issuance costs in the financial statements and requires that debt issuance costs be presented as a reduction of the carrying value of the financial liability and not as a separate asset. The guidance requires retrospective adjustment to the balance sheet presentation and disclosures applicable for a change in an accounting principle. The guidance is effective for interim and annual periods beginning after December 15, 2015. We expect to adopt this guidance on or before the effective date.
	In May 2014, the FASB issued guidance regarding the accounting for revenue from contracts with customers. The guidance may be applied retrospectively or using a modified retrospective approach to adjust retained earnings. The guidance is effective for interim and annual periods beginning on or after December 15, 2016. On April 1, 2015, the FASB proposed a deferral of the effective date by one year, which is not final until the FASB completes its due process requirements. We are currently evaluating the impact of this guidance on our financial statements.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share Table	The following is the calculation of basic and diluted weighted-average shares outstanding and earnings per share (EPS) for the indicated periods:
			Three Months Ended
			March 31,
			2015			2014
			(In millions, except per share data)
	Income (numerator):
	Income (loss) from continuing operations		$	(480	)	$	27
	Income (loss) from discontinued operations		—			257
	Net income (loss)		$	(480	)	$	284
	Weighted-average shares (denominator):
	Weighted-average shares — basic		145			136
	Dilution effect of stock options and unvested restricted stock and restricted stock units outstanding at end of period(1)(2)		—			1
	Weighted-average shares — diluted		145			137
	Earnings (loss) per share:
	Basic:
	Income (loss) from continuing operations		$	(3.30	)	$	0.19
	Income (loss) from discontinued operations		—			1.89
	Basic earnings (loss) per share		$	(3.30	)	$	2.08
	Diluted:
	Income (loss) from continuing operations		$	(3.30	)	$	0.19
	Income (loss) from discontinued operations		—			1.88
	Diluted earnings (loss) per share		$	(3.30	)	$	2.07
	_______
	-1	The effect of 2.4 million unvested restricted stock or restricted stock units and stock options has not been included in the calculation of shares outstanding for diluted EPS for the quarter ended March 31, 2015, as their effect would have been anti-dilutive. Had we recognized income from continuing operations for the quarter, incremental shares attributable to the assumed vesting of unvested restricted stock and restricted stock units and the assumed exercise of outstanding stock options would have increased diluted weighted-average shares outstanding by 1.3 million shares for the three months ended March 31, 2015.
	-2	Excludes 1.5 million shares of unvested restricted stock or restricted stock units and stock options for the three months ended March 31, 2014, respectively, because including the effect would have been anti-dilutive.

Oil_and_Gas_Assets_Tables

Oil and Gas Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Oil and Gas Property [Abstract]
Costs incurred by year for oil and gas properties not subject to amortization	Oil and gas properties not subject to amortization as of March 31, 2015, consisted of the following:
		Costs Incurred In
		2015			2014			2013		2012 and Prior		Total
		(In millions)
	Acquisition costs	$	41		$	182		$	158	$	91	$	472
	Exploration costs	78			82			—		—		160
	Fee mineral interests	—			—			1		23		24
	Capitalized interest	7			52			14		—		73
	Total oil and gas properties not subject to amortization	$	126		$	316		$	173	$	114	$	729
Capitalized Costs Relating to Oil and Gas Producing Activities and Other PPE [Table Text Block]	Property and equipment consisted of the following:
		March 31,			December 31,
		2015			2014
		(In millions)
	Oil and gas properties:
	Subject to amortization	$	15,254		$	15,707
	Not subject to amortization	729			677
	Gross oil and gas properties	15,983			16,384
	Accumulated depreciation, depletion and amortization	(8,380		)	(8,152		)
	Net oil and gas properties	$	7,603		$	8,232
	Other property and equipment:
	Furniture, fixtures and equipment	$	143		$	144
	Gathering systems and equipment	115			114
	Accumulated depreciation and amortization	(82		)	(76		)
	Net other property and equipment	$	176		$	182

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedges, Assets [Abstract]
Outstanding contracts that are not designated for hedge accounting	At March 31, 2015, we had outstanding derivative positions as set forth in the tables below.
	Crude Oil
						NYMEX Contract Price Per Bbl
																Collars							Estimated Fair Value
	Period and Type of Instrument		Volume in MBbls			Swaps				Purchased Calls (Weighted Average)			Sold Puts			Floors				Ceilings			Asset (Liability)
						(Weighted Average)							(Weighted Average)(1)			(Weighted Average)				(Weighted Average)
																							(In millions)
	2015:00:00
	Fixed-price swaps		1,555			$	90			$	—		$	—		$	—			$	—		$	60
	Fixed-price swaps with sold puts:		11,554
	Fixed-price swaps					90				—			—			—				—			429
	Sold puts					—				—			71.57			—				—			(229		)
	Collars with sold puts:		550
	Collars					—				—			—			90				104			21
	Sold puts					—				—			75			—				—			(13		)
	2016:00:00
	Fixed-price swaps with sold puts:		10,060
	Fixed-price swaps					89.98				—			—			—				—			316
	Sold puts					—				—			74.14			—				—			(187		)
	Collars with sold puts:		6,220
	Collars					—				—			—			90				96.15			198
	Sold puts					—				—			75			—				—			(120		)
	Purchased calls		732			—				70			—			—				—			2
	2017:00:00
	Fixed-price swaps with sold puts:		4,468
	Fixed-price swaps					88.37				—			—			—				—			118
	Sold puts					—				—			73.28			—				—			(72		)
	Collars with sold puts:		2,080
	Collars					—				—			—			90				95.59			61
	Sold puts					—				—			75			—				—			(37		)
	Total																						$	547
	_________________
	-1	If the market prices remain below our sold puts at contract settlement, we will receive the market price plus the following associated with our production:
	•	the difference between our floors and our sold puts for collars with sold puts; or
	•	the difference between our swaps and our sold puts for fixed-price swaps with sold puts.
	Natural Gas
						NYMEX Contract Price Per MMBtu
													Collars							Estimated Fair Value Asset (Liability)
	Period and Type of Instrument		Volume in MMMBtus			Swaps (Weighted Average)				Sold Puts (Weighted Average)			Floors (Weighted Average)			Ceilings (Weighted Average)
																				(In millions)
	2015:00:00
	Fixed-price swaps		37,125			$	4.28			$	—		$	—		$	—			$	55
	Collars		28,875			—				—			3.93			4.74				34
	2016:00:00
	Swaptions(1)		—			4.1				—			—			—				—
	Collars		10,980			—				—			4			4.54				10
	Total																			$	99
	________
	-1	During the fourth quarter of 2014, we sold natural gas swaption contracts that, if exercised on their expiration date in the second quarter of 2015, would protect 14,640 MMMBtus of calendar-year 2016 production from future commodity price volatility. These contracts give the counterparties the option to enter into swap contracts with us at $4.10/MMBtu for calendar-year 2016.
Derivative financial instruments recorded in balance sheet	We had derivative financial instruments recorded in our consolidated balance sheet as assets (liabilities) at their respective estimated fair value, as set forth below.
			Derivative Assets														Derivative Liabilities
			Gross Fair Value				Offset in Balance Sheet				Balance Sheet Location						Gross Fair Value				Offset in Balance Sheet			Balance Sheet Location
											Current			Noncurrent										Current			Noncurrent
			(In millions)														(In millions)
	March 31, 2015
	Natural gas positions		$	99			$	—			$	91		$	8		$	—			$	—		$	—		$	—
	Oil positions		1,145				(595		)		334			216			(598		)		595			(1		)	(2		)
	Total		$	1,244			$	(595	)		$	425		$	224		$	(598	)		$	595		$	(1	)	$	(2	)
	December 31, 2014
	Natural gas positions		$	105			$	(2	)		$	99		$	4		$	(2	)		$	2		$	—		$	—
	Oil positions		1,115				(597		)		332			186			(605		)		597			(8		)	—
	Total		$	1,220			$	(599	)		$	431		$	190		$	(607	)		$	599		$	(8	)	$	—
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	Derivative Financial Instruments:
	Commodity Derivative Instruments
	We utilize derivative strategies that consist of either a single derivative instrument or a combination of instruments to manage the variability in cash flows associated with the forecasted sale of our future domestic oil and natural gas production. While the use of derivative instruments may limit or partially reduce the downside risk of adverse commodity price movements, their use also may limit future income from favorable commodity price movements.
	In addition to the derivative strategies outlined in our Annual Report on Form 10-K for the year ended December 31, 2014, we also implemented a derivative strategy beginning in the first quarter of 2015 that is associated with our derivative positions for oil swaps with short puts that achieve maximum value once the market price falls below the short puts. During the first quarter of 2015, we purchased call options that effectively lock in the maximum value for a portion of our corresponding oil swaps with short puts. We elected to defer the premiums of $3 million related to these calls until contract settlement. Excluding the effect of the deferred premium, if the settlement price is above the call strike price, the counterparty is required to make a payment to us.
	Our oil and gas derivative contracts are settled based upon reported prices on the NYMEX. The estimated fair value of these contracts is based upon various factors, including closing exchange prices on the NYMEX, over-the-counter quotations, estimated volatility, non-performance risk adjustments using credit default swaps and time to maturity. The calculation of the fair value of options requires the use of an option-pricing model. See Note 9, “Fair Value Measurements.”
	At March 31, 2015, we had outstanding derivative positions as set forth in the tables below.
	Crude Oil
						NYMEX Contract Price Per Bbl
																Collars							Estimated Fair Value
	Period and Type of Instrument		Volume in MBbls			Swaps				Purchased Calls (Weighted Average)			Sold Puts			Floors				Ceilings			Asset (Liability)
						(Weighted Average)							(Weighted Average)(1)			(Weighted Average)				(Weighted Average)
																							(In millions)
	2015:00:00
	Fixed-price swaps		1,555			$	90			$	—		$	—		$	—			$	—		$	60
	Fixed-price swaps with sold puts:		11,554
	Fixed-price swaps					90				—			—			—				—			429
	Sold puts					—				—			71.57			—				—			(229		)
	Collars with sold puts:		550
	Collars					—				—			—			90				104			21
	Sold puts					—				—			75			—				—			(13		)
	2016:00:00
	Fixed-price swaps with sold puts:		10,060
	Fixed-price swaps					89.98				—			—			—				—			316
	Sold puts					—				—			74.14			—				—			(187		)
	Collars with sold puts:		6,220
	Collars					—				—			—			90				96.15			198
	Sold puts					—				—			75			—				—			(120		)
	Purchased calls		732			—				70			—			—				—			2
	2017:00:00
	Fixed-price swaps with sold puts:		4,468
	Fixed-price swaps					88.37				—			—			—				—			118
	Sold puts					—				—			73.28			—				—			(72		)
	Collars with sold puts:		2,080
	Collars					—				—			—			90				95.59			61
	Sold puts					—				—			75			—				—			(37		)
	Total																						$	547
	_________________
	-1	If the market prices remain below our sold puts at contract settlement, we will receive the market price plus the following associated with our production:
	•	the difference between our floors and our sold puts for collars with sold puts; or
	•	the difference between our swaps and our sold puts for fixed-price swaps with sold puts.
	Natural Gas
						NYMEX Contract Price Per MMBtu
													Collars							Estimated Fair Value Asset (Liability)
	Period and Type of Instrument		Volume in MMMBtus			Swaps (Weighted Average)				Sold Puts (Weighted Average)			Floors (Weighted Average)			Ceilings (Weighted Average)
																				(In millions)
	2015:00:00
	Fixed-price swaps		37,125			$	4.28			$	—		$	—		$	—			$	55
	Collars		28,875			—				—			3.93			4.74				34
	2016:00:00
	Swaptions(1)		—			4.1				—			—			—				—
	Collars		10,980			—				—			4			4.54				10
	Total																			$	99
	________
	-1	During the fourth quarter of 2014, we sold natural gas swaption contracts that, if exercised on their expiration date in the second quarter of 2015, would protect 14,640 MMMBtus of calendar-year 2016 production from future commodity price volatility. These contracts give the counterparties the option to enter into swap contracts with us at $4.10/MMBtu for calendar-year 2016.
	Additional Disclosures about Derivative Financial Instruments
	We had derivative financial instruments recorded in our consolidated balance sheet as assets (liabilities) at their respective estimated fair value, as set forth below.
			Derivative Assets														Derivative Liabilities
			Gross Fair Value				Offset in Balance Sheet				Balance Sheet Location						Gross Fair Value				Offset in Balance Sheet			Balance Sheet Location
											Current			Noncurrent										Current			Noncurrent
			(In millions)														(In millions)
	March 31, 2015
	Natural gas positions		$	99			$	—			$	91		$	8		$	—			$	—		$	—		$	—
	Oil positions		1,145				(595		)		334			216			(598		)		595			(1		)	(2		)
	Total		$	1,244			$	(595	)		$	425		$	224		$	(598	)		$	595		$	(1	)	$	(2	)
December 31, 2014
Natural gas positions		$	105			$	(2	)		$	99		$	4		$	(2	)		$	2		$	—		$	—
Oil positions		1,115				(597		)		332			186			(605		)		597			(8		)	—
Total		$	1,220			$	(599	)		$	431		$	190		$	(607	)		$	599		$	(8	)	$	—
The amount of gain (loss) recognized in “Commodity derivative income (expense)” in our consolidated statement of operations related to our derivative financial instruments follows:
		Three Months Ended
		March 31,
		2015				2014
		(In millions)
Derivatives not designated as hedging instruments:
Realized gain (loss) on natural gas positions		$	25			$	(22	)
Realized gain (loss) on oil positions		96				(17		)
Total realized gain (loss)		121				(39		)
Unrealized gain (loss) on natural gas positions		(5		)		(17		)
Unrealized gain (loss) on oil positions		37				(40		)
Total unrealized gain (loss)		32				(57		)
Total		$	153			$	(96	)
The use of derivative transactions involves the risk that the counterparties, which generally are financial institutions, will be unable to meet the financial terms of such transactions. Our derivative contracts are with multiple counterparties to minimize our exposure to any individual counterparty, and we have netting arrangements with all of our counterparties that provide for offsetting payables against receivables from separate derivative instruments with that counterparty. At March 31, 2015, ten of our 16 counterparties accounted for approximately 85% of our contracted volumes, with no single counterparty accounting for more than 15%.
Approximately 72% of our volumes subject to derivative instruments are with lenders under our credit facility. Our credit facility, senior notes and substantially all of our derivative instruments contain provisions that provide for cross defaults and acceleration of those debt and derivative instruments in certain situations.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Operations [Table Text Block]	The amount of gain (loss) recognized in “Commodity derivative income (expense)” in our consolidated statement of operations related to our derivative financial instruments follows:
			Three Months Ended
			March 31,
			2015				2014
			(In millions)
	Derivatives not designated as hedging instruments:
	Realized gain (loss) on natural gas positions		$	25			$	(22	)
	Realized gain (loss) on oil positions		96				(17		)
	Total realized gain (loss)		121				(39		)
	Unrealized gain (loss) on natural gas positions		(5		)		(17		)
	Unrealized gain (loss) on oil positions		37				(40		)
	Total unrealized gain (loss)		32				(57		)
	Total		$	153			$	(96	)

Accounts_Receivable_Tables

Accounts Receivable (Tables) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015							Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable, Net, Current	$354							$439
Accounts Receivable	Accounts receivable consisted of the following:
		March 31,			December 31,
		2015			2014
		(In millions)
	Revenue	$	102		$	155
	Joint interest	200			230
	Other	68			70
	Reserve for doubtful accounts	(16		)	(16		)
	Total accounts receivable, net	$	354		$	439
	Reserve for doubtful accounts includes an allowance for $15 million related to discontinued operations. See Note 16, "Discontinued Operations."
Revenue [Member]
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable, Net, Current	102							155
Other accounts receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable, Net, Current	68							70
Allowance For Doubtful Accounts [Member]
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable, Net, Current	-16							-16
Oil and Gas Joint Interest Billing [Member]
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable, Net, Current	$200							$230

Accrued_Liabilities_Tables

Accrued Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Accrued Liabilities, Current [Abstract]
Accrued Liabilities	Accrued liabilities consisted of the following:
		March 31,		December 31,
		2015		2014
		(In millions)
	Revenue payable	$	139	$	197
	Accrued capital costs	293		441
	Accrued lease operating expenses	41		47
	Employee incentive expense	28		62
	Accrued interest on debt	32		67
	Taxes payable	39		32
	Other	34		34
	Total accrued liabilities	$	606	$	880

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair value by measurement classification and type Table	The following table summarizes the valuation of our assets and liabilities that are measured at fair value on a recurring basis.
		Fair Value Measurement Classification
		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)				Total
		(In millions)
	As of December 31, 2014:
	Money market fund investments	$	1		$	—		$	—			$	1
	Deferred compensation plan assets	9			—			—				9
	Equity securities available-for-sale	10			—			—				10
	Oil and gas derivative swap contracts	—			994			—				994
	Oil and gas derivative option and swaption contracts	—			—			(381		)		(381		)
	Stock-based compensation liability awards	(12		)	—			(3		)		(15		)
	Total	$	8		$	994		$	(384	)		$	618
	As of March 31, 2015:
	Money market fund investments	$	768		$	—		$	—			$	768
	Deferred compensation plan assets	5			—			—				5
	Equity securities available-for-sale	9			—			—				9
	Oil and gas derivative swap contracts	—			978			—				978
	Oil and gas derivative option and swaption contracts	—			—			(332		)		(332		)
	Stock-based compensation liability awards	(19		)	—			(8		)		(27		)
	Total	$	763		$	978		$	(340	)		$	1,401
Fair value changes level 3 Table	The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the indicated periods.
		Investments			Derivatives			Stock-Based Compensation				Total
		(In millions)
	Balance at January 1, 2014	$	39		$	(8	)	$	(5	)		$	26
	Realized or unrealized gains (losses) included in earnings	—			(13		)	(14		)		(27		)
	Purchases, issuances, sales and settlements:
	Sales	(39		)	—			—				(39		)
	Settlements	—			2			—				2
	Transfers in to Level 3	—			—			—				—
	Transfers out of Level 3	—			—			—				—
	Balance at March 31, 2014	$	—		$	(19	)	$	(19	)		$	(38	)
	Change in unrealized gains or losses included in earnings relating to Level 3 instruments still held at March 31, 2014	$	—		$	(11	)	$	(14	)		$	(25	)
	Balance at January 1, 2015	$	—		$	(381	)	$	(3	)		$	(384	)
	Realized or unrealized gains (losses) included in earnings	—			(21		)	(5		)		(26		)
	Purchases, issuances, sales and settlements:
	Settlements	—			70			—				70
	Transfers in to Level 3	—			—			—				—
	Transfers out of Level 3	—			—			—				—
	Balance at March 31, 2015	$	—		$	(332	)	$	(8	)		$	(340	)
	Change in unrealized gains or losses included in earnings relating to Level 3 instruments still held at March 31, 2015	$	—		$	(4	)	$	(5	)		$	(9	)
Quantitative disclosures about unobservable inputs
		Estimated Fair Value Asset (Liability)			Quantitative Information about Level 3 Fair Value Measurements
	Instrument Type				Valuation Technique		Unobservable Input	Range
		(In millions)
	Oil option contracts	$	(376	)	Black-Scholes		Oil price volatility	21.39	%		—		68.99	%
							Credit risk	0.01	%		—		2.1	%
	Natural gas option and swaption contracts	$	44		Black-Scholes		Natural gas price volatility	23.44	%		—		54.28	%
							Credit risk	0.01	%		—		1.36	%
	SVAP	$	(8	)	Monte Carlo		Implied volatility						46.7	%
Estimated fair value of the debt instrument at the balance sheet date	The estimated fair value of our notes, based on quoted prices in active markets (Level 1) as of the indicated dates, was as follows:
		March 31,			December 31,
		2015			2014
		(In millions)
	5¾% Senior Notes due 2022	$	789		$	772
	5⅝% Senior Notes due 2024	1,041			989
	5⅜% Senior Notes due 2026	709			—
	6⅞% Senior Subordinated Notes due 2020	725			721

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	Our debt consisted of the following:
		March 31,			December 31,
		2015			2014
		(In millions)
	Senior unsecured debt:
	Revolving credit facility — LIBOR based loans	$	—		$	345
	Money market lines of credit(1)	—			101
	Total credit arrangements	—			446
	5¾% Senior Notes due 2022	750			750
	5⅝% Senior Notes due 2024	1,000			1,000
	5⅜% Senior Notes due 2026	700			—
	Total senior unsecured debt	2,450			2,196
	6⅞% Senior Subordinated Notes due 2020	700			700
	Discount on notes	(4		)	(4		)
	Total long-term debt	$	3,146		$	2,892
	________
	(1) Because we have the ability and intent to use our available credit facility to repay borrowings under our money market lines of credit as of the indicated dates, amounts outstanding under these obligations, if any, are classified as long-term.

Income_Taxes_Tables

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Provision for income taxes using federal statutory rate	The provision (benefit) for income taxes for continuing operations for the indicated periods was different than the amount computed using the federal statutory rate (35%) for the following reasons:
		Three Months Ended
		March 31,
		2015			2014
		(In millions)
	Amount computed using the statutory rate	$	(266	)	$	17
	Increase (decrease) in taxes resulting from:
	State and local income taxes, net of federal effect	(17		)	2
	Foreign tax on foreign earnings	2			2
	Other	1			2
	Total provision (benefit) for income taxes	$	(280	)	$	23

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation [Abstract]
Schedule of Stock Based Compensation Expense Table	Our stock-based compensation consisted of the following:
		Three Months Ended
		March 31,
		2015				2014
		(In millions)
	Equity awards	$	10			$	11
	Liability awards:
	Stockholder Value Appreciation Program	5				14
	Cash-settled restricted stock units	7				6
	Total liability awards	12				20
	Total stock-based compensation	22				31
	Capitalized in oil and gas properties	(7		)		(14		)
	Net stock-based compensation expense	$	15			$	17
Restricted Stock and Restricted Stock Unit Activity Table	The following table provides information about restricted stock and restricted stock unit activity.
		Service-Based			Performance/			Total		Weighted- Average Grant Date Fair Value per Share
		Shares			Market-Based			Shares
					Shares
		(In thousands, except per share data)
	Non-vested shares outstanding at January 1, 2015	1,902			945			2,847		$	30.05
	Granted	221			414			635		25.12
	Forfeited	(171	)		—			(171	)	22.63
	Vested	(53	)		(40	)		(93	)	44.47
	Non-vested shares outstanding at March 31, 2015	1,899			1,319			3,218		$	28.62

Supplemental_Cash_Flows_Inform1

Supplemental Cash Flows Information (Tables)	3 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flows Information Schedule (Table)	The following table presents information about supplemental cash flows for the indicated periods.
		Three Months Ended
		March 31,
		2015		2014
		(In millions)
	Non-cash investing and financing activities excluded from the statement of cash flows:
	(Increase) decrease in receivables for property sales	$	7	$	—
	(Increase) decrease in accrued capital expenditures	109		90
	(Increase) decrease in asset retirement costs	3		13

Discontinued_Operations_Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
		Three Months Ended
		March 31,
		2014
		(In millions)
	Oil and gas revenues	$	90
	Operating expenses	69
	Income (loss) from discontinued operations	21
	Gain on sale of Malaysia business	388
	Income from discontinued operations before income taxes	409
	Income tax provision (benefit):
	Current	12
	Deferred	140
	Total income tax provision (benefit)	152
	Income (loss) from discontinued operations, net of tax	$	257

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015									Mar. 31, 2014
Segment Reporting [Abstract]
Segment Information Table
		Domestic			China		Total				Domestic		China		Total
		(In millions)									(In millions)
	Three Months Ended March 31, 2015:									Three Months Ended March 31, 2014:
	Oil, gas and NGL revenues	$	303		$	46	$	349		Oil, gas and NGL revenues	$	553	$	18	$	571
	Operating expenses:									Operating expenses:
	Lease operating	65			10		75			Lease operating	72		2		74
	Transportation and processing	49			—		49			Transportation and processing	37		—		37
	Production and other taxes	13			—		13			Production and other taxes	25		3		28
	Depreciation, depletion and amortization	212			25		237			Depreciation, depletion and amortization	188		4		192
	General and administrative	61			2		63			General and administrative	56		—		56
	Ceiling test and other impairments	792			—		792			Other	2		—		2
	Other	3			1		4			Allocated income tax (benefit)	64		5
	Allocated income tax (benefit)	(330		)	5					Net income (loss) from oil and gas properties	$	109	$	4
	Net income (loss) from oil and gas properties	$	(562	)	$	3				Total operating expenses					389
	Total operating expenses						1,233			Income (loss) from continuing operations					182
	Income (loss) from continuing operations						(884		)	Interest expense, net of interest income, capitalized interest and other					(36		)
	Interest expense, net of interest income, capitalized interest and other						(29		)	Commodity derivative income (expense)					(96		)
	Commodity derivative income (expense)						153			Income (loss) from continuing operations before income taxes					$	50
	Income (loss) from continuing operations before income taxes						$	(760	)	Total assets	$	8,080	$	571	$	8,651
	Total assets	$	9,005		$	673	$	9,678
										Additions to long-lived assets	$	438	$	17	$	455
	Additions to long-lived assets	$	396		$	12	$	408
Segment Reporting Disclosure [Text Block]	Segment Information
	While we only have operations in the oil and gas exploration and production industry, we are organizationally structured along geographic operating segments. Our current operating segments are the United States and China. The accounting policies of each of our operating segments are the same as those described in Note 1, “Organization and Summary of Significant Accounting Policies.”
	The following tables provide the geographic operating segment information for our continuing operations for the three-month periods ended March 31, 2015 and 2014. Income tax allocations have been determined based on statutory rates in the applicable geographic segment. In order to reflect the double taxation of our earnings and profits in China, we have applied the statutory rates for China and the U.S. to determine our income tax allocation for our China operations in the following tables.
		Domestic			China		Total
		(In millions)
	Three Months Ended March 31, 2015:
	Oil, gas and NGL revenues	$	303		$	46	$	349
	Operating expenses:
	Lease operating	65			10		75
	Transportation and processing	49			—		49
	Production and other taxes	13			—		13
	Depreciation, depletion and amortization	212			25		237
	General and administrative	61			2		63
	Ceiling test and other impairments	792			—		792
	Other	3			1		4
	Allocated income tax (benefit)	(330		)	5
	Net income (loss) from oil and gas properties	$	(562	)	$	3
	Total operating expenses						1,233
	Income (loss) from continuing operations						(884		)
	Interest expense, net of interest income, capitalized interest and other						(29		)
	Commodity derivative income (expense)						153
	Income (loss) from continuing operations before income taxes						$	(760	)
	Total assets	$	9,005		$	673	$	9,678
	Additions to long-lived assets	$	396		$	12	$	408
		Domestic			China		Total
		(In millions)
	Three Months Ended March 31, 2014:
	Oil, gas and NGL revenues	$	553		$	18	$	571
	Operating expenses:
	Lease operating	72			2		74
	Transportation and processing	37			—		37
	Production and other taxes	25			3		28
	Depreciation, depletion and amortization	188			4		192
	General and administrative	56			—		56
	Other	2			—		2
	Allocated income tax (benefit)	64			5
	Net income (loss) from oil and gas properties	$	109		$	4
	Total operating expenses						389
	Income (loss) from continuing operations						182
	Interest expense, net of interest income, capitalized interest and other						(36		)
	Commodity derivative income (expense)						(96		)
	Income (loss) from continuing operations before income taxes						$	50
	Total assets	$	8,080		$	571	$	8,651
	Additions to long-lived assets	$	438		$	17	$	455

Organization_and_Summary_of_Si2

Organization and Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
	MBbls	MBbls
Restricted Cash and Cash Equivalents	$3
Stock Issued During Period, Shares, New Issues	25,300,000
Common Stock, Shares, Issued	163,001,991	137,603,643
Stock Issued During Period, Value, New Issues	815
Change in ARO (asset retirement obligation)
Less: Current portion of ARO	-2	-3
Total long-term ARO	183	183
Organization and Summary of Significant Accounting Policies (Textuals) [Abstract]
Crude oil inventory (in barrels)	144,000	240,000
Crude oil inventory	5	8
Capitalization of internal costs per full cost method of accounting	32		54
Discount rate	10.00%
Unweighted average commodity price of natural gas based on first-day-of-the-month prices for the prior 12 months (per MMBtu)	3.88
Unweighted average commodity price of oil based on first-day-of-the-month prices for the prior 12 months (per barrel)	82.6
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		-10	252
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	0		388
CHINA
UnamortizedCostCapitalizedLessRelatedDeferredIncomeTaxesCeilingLimitationCushion	200
Domestic [Member]
Capitalized Costs Exceeding Ceiling, Net	496
Unamortized Costs Capitalized Less Related Deferred Income Taxes Exceed Ceiling Limitation Expense Gross	$788

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income (numerator):
Income (Loss) from Continuing Operations Attributable to Parent	($480)	$27
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	257
Net income (loss)	($480)	$284
Weighted average shares (denominator):
Weighted average shares - basic	145,000,000	136,000,000
Dilution effect of stock options and unvested restricted stock and restricted stock units outstanding at end of period	0	1,000,000
Weighted average shares - diluted	145,000,000	137,000,000
Basic --
Income (Loss) from Continuing Operations, Per Basic Share	($3.30)	$0.19
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	$0	$1.89
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$0	$1.89
Earnings (Loss) Per Share, Basic	($3.30)	$2.08
Diluted --
Income (Loss) from Continuing Operations, Per Diluted Share	($3.30)	$0.19
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	$0	$1.88
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$0	$1.88
Earnings (Loss) Per Share, Diluted	($3.30)	$2.07
Earnings Per Share (Textuals) [Abstract]
Incremental shares attributable to the assumed exercise of outstanding stock options and the assumed vesting of unvested restricted stock and restricted stock units	2,400,000	1,500,000
AntidilutiveSecuritesExcludedDueToLossInPeriod	1,300,000

Oil_and_Gas_Assets_Details

Oil and Gas Assets (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Oil and gas properties:
Subject to amortization	$15,254,000,000		$15,707,000,000
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	729,000,000		677,000,000
Oil and Gas Property, Full Cost Method, Gross	15,983,000,000		16,384,000,000
Oil and Gas Property, Full Cost Method, Depletion	-8,380,000,000		-8,152,000,000
Oil and Gas Property, Full Cost Method, Net	7,603,000,000		8,232,000,000
Accumulated depreciation and amortization	-82,000,000		-76,000,000
Net other property and equipment	176,000,000		182,000,000
Cost of oil and gas properties not subject to amortization
Acquisition costs	472,000,000
Exploration costs	160,000,000
Fee mineral interests	24,000,000
Capitalized interest	73,000,000
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	729,000,000		677,000,000
Oil and Gas Assets (Textuals) [Abstract]
Proceeds from Sale of Oil and Gas Property and Equipment	29,000,000	10,000,000
Granite Wash [Member]
Oil and Gas Assets (Textuals) [Abstract]
Sales of Oil and Gas Prospects			588,000,000
Furniture and Fixtures [Member]
Oil and gas properties:
Other property and equipment	143,000,000		144,000,000
Gas Gathering and Processing Equipment [Member]
Oil and gas properties:
Other property and equipment	115,000,000		114,000,000
Costs incurred in 2015 not subject to amortization [Member]
Oil and gas properties:
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	126,000,000
Cost of oil and gas properties not subject to amortization
Acquisition costs	41,000,000
Exploration costs	78,000,000
Fee mineral interests	0
Capitalized interest	7,000,000
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	126,000,000
Costs incurred in 2014 not subject to amortization [Member]
Oil and gas properties:
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	316,000,000
Cost of oil and gas properties not subject to amortization
Acquisition costs	182,000,000
Exploration costs	82,000,000
Fee mineral interests	0
Capitalized interest	52,000,000
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	316,000,000
Costs incurred in 2013 not subject to amortization [Member]
Oil and gas properties:
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	173,000,000
Cost of oil and gas properties not subject to amortization
Acquisition costs	158,000,000
Exploration costs	0
Fee mineral interests	1,000,000
Capitalized interest	14,000,000
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	173,000,000
Costs incurred in 2012 and prior not subject to amortization [Member]
Oil and gas properties:
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	114,000,000
Cost of oil and gas properties not subject to amortization
Acquisition costs	91,000,000
Exploration costs	0
Fee mineral interests	23,000,000
Capitalized interest	0
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	$114,000,000

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Textuals) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$1,244		$1,220
Realized Gain Loss On Derivatives	121	-39
Deferred Premium	3
Unrealized Gain (Loss) on Derivatives	32	-57
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	153	-96
Derivative Asset, Fair Value, Gross Liability	595		599
Derivative Asset, Current	425		431
Derivative Asset, Noncurrent	224		190
Derivative Liability, Fair Value, Gross Liability	598		607
Derivative Liability, Fair Value, Gross Asset	595		599
Derivative Liability, Current	1		8
Derivative Liability, Noncurrent	2		0
ConcentrationOfCounterpartiesUnderCreditFacility	72.00%
Total Derivative Counterparties	16
Primary Derivative Counterparties	10
Percent of future hedged production with primary counterparties	85.00%
Number of counterparties holding more than 15 percent of future hedge position.	0
Concentraction Of Future Hedged Production	15.00%
Natural gas contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	99		105
Realized Gain Loss On Derivatives	25	-22
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	99
Unrealized Gain (Loss) on Derivatives	-5	-17
Derivative Asset, Fair Value, Gross Liability	0		2
Derivative Asset, Current	91		99
Derivative Asset, Noncurrent	8		4
Derivative Liability, Fair Value, Gross Liability	0		2
Derivative Liability, Fair Value, Gross Asset	0		2
Derivative Liability, Current	0		0
Derivative Liability, Noncurrent	0		0
Oil contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,145		1,115
Realized Gain Loss On Derivatives	96	-17
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	547
Unrealized Gain (Loss) on Derivatives	37	-40
Derivative Asset, Fair Value, Gross Liability	595		597
Derivative Asset, Current	334		332
Derivative Asset, Noncurrent	216		186
Derivative Liability, Fair Value, Gross Liability	598		605
Derivative Liability, Fair Value, Gross Asset	595		597
Derivative Liability, Current	1		8
Derivative Liability, Noncurrent	2		0
Year2015 [Member] | Natural gas contracts [Member] | Swap [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	55
Derivative, Swap Type, Average Fixed Price	4.28
Volume In Mmbtus	37,125,000
Year2015 [Member] | Natural gas contracts [Member] | Collars [Member]
Derivative [Line Items]
Derivative, Weighted Average Ceiling Price	4.74
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	34
Volume In Mmbtus	28,875,000
Derivative, Weighted Average Floor Price	3.93
Year2015 [Member] | Oil contracts [Member] | Collars with Sold Puts - Collar [Member]
Derivative [Line Items]
Derivative, Weighted Average Ceiling Price	104
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	21
Derivative, Weighted Average Floor Price	90
Year2015 [Member] | Oil contracts [Member] | Fixed Price Swaps with Sold Puts - Swap [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	429
Derivative, Swap Type, Average Fixed Price	90
Year2015 [Member] | Oil contracts [Member] | Swap [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	60
Volume in MBbls	1,555,000
Derivative, Swap Type, Average Fixed Price	90
Year2015 [Member] | Oil contracts [Member] | Fixed Price Swaps With Sold Puts [Member]
Derivative [Line Items]
Volume in MBbls	11,554,000
Year2015 [Member] | Oil contracts [Member] | Fixed Price Swaps with Sold Puts - Sold Put [Member]
Derivative [Line Items]
Derivative Average Additional Put Price	71.57
Derivative Liability, Fair Value, Total	-229
Year2015 [Member] | Oil contracts [Member] | Collars with Sold Puts - Sold Put [Member]
Derivative [Line Items]
Derivative Average Additional Put Price	75
Derivative Liability, Fair Value, Total	-13
Year2015 [Member] | Oil contracts [Member] | Collars With Sold Puts [Member]
Derivative [Line Items]
Volume in MBbls	550,000
Year 2016 [Member] | Natural gas contracts [Member] | Swaption [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	4.1
Derivative Liability, Fair Value, Total	0
Volume In Mmbtus	14,640
Year 2016 [Member] | Natural gas contracts [Member] | Collars [Member]
Derivative [Line Items]
Derivative, Weighted Average Ceiling Price	4.54
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	10
Volume In Mmbtus	10,980,000
Derivative, Weighted Average Floor Price	4
Year 2016 [Member] | Oil contracts [Member] | Collars with Sold Puts - Collar [Member]
Derivative [Line Items]
Derivative, Weighted Average Ceiling Price	96.15
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	198
Derivative, Weighted Average Floor Price	90
Year 2016 [Member] | Oil contracts [Member] | Fixed Price Swaps with Sold Puts - Swap [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	316
Derivative, Swap Type, Average Fixed Price	89.98
Year 2016 [Member] | Oil contracts [Member] | Fixed Price Swaps With Sold Puts [Member]
Derivative [Line Items]
Volume in MBbls	10,060,000
Year 2016 [Member] | Oil contracts [Member] | Fixed Price Swaps with Sold Puts - Sold Put [Member]
Derivative [Line Items]
Derivative Average Additional Put Price	74.14
Derivative Liability, Fair Value, Total	-187
Year 2016 [Member] | Oil contracts [Member] | Collars with Sold Puts - Sold Put [Member]
Derivative [Line Items]
Derivative Average Additional Put Price	75
Derivative Liability, Fair Value, Total	-120
Year 2016 [Member] | Oil contracts [Member] | Call Option [Member]
Derivative [Line Items]
Derivative, Weighted Average Ceiling Price	70,000,000
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	2
Volume in MBbls	732,000,000
Year 2016 [Member] | Oil contracts [Member] | Collars With Sold Puts [Member]
Derivative [Line Items]
Volume in MBbls	6,220,000
Year2017 [Member] | Oil contracts [Member] | Collars with Sold Puts - Collar [Member]
Derivative [Line Items]
Derivative, Weighted Average Ceiling Price	95.59
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	61
Derivative, Weighted Average Floor Price	90
Year2017 [Member] | Oil contracts [Member] | Fixed Price Swaps with Sold Puts - Swap [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	118
Derivative, Swap Type, Average Fixed Price	88.37
Year2017 [Member] | Oil contracts [Member] | Fixed Price Swaps With Sold Puts [Member]
Derivative [Line Items]
Volume in MBbls	4,468,000
Year2017 [Member] | Oil contracts [Member] | Fixed Price Swaps with Sold Puts - Sold Put [Member]
Derivative [Line Items]
Derivative Average Additional Put Price	73.28
Derivative Liability, Fair Value, Total	-72
Year2017 [Member] | Oil contracts [Member] | Collars with Sold Puts - Sold Put [Member]
Derivative [Line Items]
Derivative Average Additional Put Price	75
Derivative Liability, Fair Value, Total	($37)
Year2017 [Member] | Oil contracts [Member] | Collars With Sold Puts [Member]
Derivative [Line Items]
Volume in MBbls	2,080,000

Outstanding_Natural_Gas_Contra

Outstanding Natural Gas Contracts That Are Not Designated for Hedge Accounting (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Derivative [Line Items]
Schedule of Derivative Instruments [Table Text Block]	At March 31, 2015, we had outstanding derivative positions as set forth in the tables below.
	Crude Oil
				NYMEX Contract Price Per Bbl
										Collars				Estimated Fair Value
	Period and Type of Instrument		Volume in MBbls	Swaps		Purchased Calls (Weighted Average)		Sold Puts		Floors		Ceilings		Asset (Liability)
				(Weighted Average)				(Weighted Average)(1)		(Weighted Average)		(Weighted Average)
														(In millions)
	2015:00:00
	Fixed-price swaps		1,555	$	90	$	—	$	—	$	—	$	—	$	60
	Fixed-price swaps with sold puts:		11,554
	Fixed-price swaps			90		—		—		—		—		429
	Sold puts			—		—		71.57		—		—		(229		)
	Collars with sold puts:		550
	Collars			—		—		—		90		104		21
	Sold puts			—		—		75		—		—		(13		)
	2016:00:00
	Fixed-price swaps with sold puts:		10,060
	Fixed-price swaps			89.98		—		—		—		—		316
	Sold puts			—		—		74.14		—		—		(187		)
	Collars with sold puts:		6,220
	Collars			—		—		—		90		96.15		198
	Sold puts			—		—		75		—		—		(120		)
	Purchased calls		732	—		70		—		—		—		2
	2017:00:00
	Fixed-price swaps with sold puts:		4,468
	Fixed-price swaps			88.37		—		—		—		—		118
	Sold puts			—		—		73.28		—		—		(72		)
	Collars with sold puts:		2,080
	Collars			—		—		—		90		95.59		61
	Sold puts			—		—		75		—		—		(37		)
	Total													$	547
	_________________
	-1	If the market prices remain below our sold puts at contract settlement, we will receive the market price plus the following associated with our production:
	•	the difference between our floors and our sold puts for collars with sold puts; or
	•	the difference between our swaps and our sold puts for fixed-price swaps with sold puts.
	Natural Gas
				NYMEX Contract Price Per MMBtu
								Collars				Estimated Fair Value Asset (Liability)
	Period and Type of Instrument		Volume in MMMBtus	Swaps (Weighted Average)		Sold Puts (Weighted Average)		Floors (Weighted Average)		Ceilings (Weighted Average)
												(In millions)
	2015:00:00
	Fixed-price swaps		37,125	$	4.28	$	—	$	—	$	—	$	55
	Collars		28,875	—		—		3.93		4.74		34
	2016:00:00
	Swaptions(1)		—	4.1		—		—		—		—
	Collars		10,980	—		—		4		4.54		10
	Total											$	99
	________
	-1	During the fourth quarter of 2014, we sold natural gas swaption contracts that, if exercised on their expiration date in the second quarter of 2015, would protect 14,640 MMMBtus of calendar-year 2016 production from future commodity price volatility. These contracts give the counterparties the option to enter into swap contracts with us at $4.10/MMBtu for calendar-year 2016.
Natural gas contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Total	99
Collars [Member] | Natural gas contracts [Member] | Year2015 [Member]
Derivative [Line Items]
Natural Gas Volumes	28,875,000
Derivative, Weighted Average Floor Price	3.93
Derivative, Weighted Average Ceiling Price	4.74
Derivative Asset, Fair Value, Total	34
Collars [Member] | Natural gas contracts [Member] | Year 2016 [Member]
Derivative [Line Items]
Natural Gas Volumes	10,980,000
Derivative, Weighted Average Floor Price	4
Derivative, Weighted Average Ceiling Price	4.54
Derivative Asset, Fair Value, Total	10
Swaption [Member] | Natural gas contracts [Member] | Year 2016 [Member]
Derivative [Line Items]
Natural Gas Volumes	14,640
Derivative Liability, Fair Value, Total	0
Derivative, Swap Type, Average Fixed Price	4.1
Fixed-price swaps | Natural gas contracts [Member] | Year2015 [Member]
Derivative [Line Items]
Natural Gas Volumes	37,125,000
Derivative, Swap Type, Average Fixed Price	4.28
Derivative Asset, Fair Value, Total	55

Derivative_Financial_Instrumen3

Derivative Financial Instruments Recorded in Balance Sheet (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Derivative, Fair Value, Net [Abstract]
Derivative Asset Not Designated As Hedging Instrument, Fair Value	$1,244	$1,220
Derivative Asset, Fair Value, Gross Liability	-595	-599
Derivative Liability Not Designated as Hedging Instrument Fair Value	-598	-607
Derivative Liability, Fair Value, Gross Asset	595	599
Derivative Asset, Current	425	431
Derivative Asset, Noncurrent	224	190
Derivative Liability, Current	1	8
Derivative Liability, Noncurrent	2	0
Natural gas contracts [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Asset Not Designated As Hedging Instrument, Fair Value	99	105
Derivative Asset, Fair Value, Gross Liability	0	-2
Derivative Liability Not Designated as Hedging Instrument Fair Value	0	-2
Derivative Liability, Fair Value, Gross Asset	0	2
Derivative Asset, Current	91	99
Derivative Asset, Noncurrent	8	4
Derivative Liability, Current	0	0
Derivative Liability, Noncurrent	0	0
Oil contracts [Member]
Derivative, Fair Value, Net [Abstract]
Derivative Asset Not Designated As Hedging Instrument, Fair Value	1,145	1,115
Derivative Asset, Fair Value, Gross Liability	-595	-597
Derivative Liability Not Designated as Hedging Instrument Fair Value	-598	-605
Derivative Liability, Fair Value, Gross Asset	595	597
Derivative Asset, Current	334	332
Derivative Asset, Noncurrent	216	186
Derivative Liability, Current	1	8
Derivative Liability, Noncurrent	$2	$0

Outstanding_Oil_Contracts_That

Outstanding Oil Contracts That Are Not Designated For Hedge Accounting (Details) (Oil contracts [Member], USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	$547
Fixed Price Swaps With Sold Puts [Member] | Year2015 [Member]
Derivative [Line Items]
Volume in MBbls	11,554,000
Fixed Price Swaps With Sold Puts [Member] | Year 2016 [Member]
Derivative [Line Items]
Volume in MBbls	10,060,000
Fixed Price Swaps With Sold Puts [Member] | Year2017 [Member]
Derivative [Line Items]
Volume in MBbls	4,468,000
Collars With Sold Puts [Member] | Year2015 [Member]
Derivative [Line Items]
Volume in MBbls	550,000
Collars With Sold Puts [Member] | Year 2016 [Member]
Derivative [Line Items]
Volume in MBbls	6,220,000
Collars With Sold Puts [Member] | Year2017 [Member]
Derivative [Line Items]
Volume in MBbls	2,080,000
Fixed-price swaps | Year2015 [Member]
Derivative [Line Items]
Volume in MBbls	1,555,000
Derivative, Swap Type, Average Fixed Price	90
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	$60

Amount_of_Gain_Loss_Recognized

Amount of Gain Loss Recognized in Income Related to Derivative Financial Instruments (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Realized Gain (Loss) on Derivatives	$121	($39)
Unrealized Gain (Loss) on Derivatives	32	-57
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	153	-96
Natural gas contracts [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Realized Gain (Loss) on Derivatives	25	-22
Unrealized Gain (Loss) on Derivatives	-5	-17
Oil contracts [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Realized Gain (Loss) on Derivatives	96	-17
Unrealized Gain (Loss) on Derivatives	$37	($40)

Accounts_Receivable_Details

Accounts Receivable (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Reserve for Doubtful Accounts [Abstract]
Malaysia Reserve for Doubtful Accounts Allowance	$15

Accrued_Liabilities_Details

Accrued Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Accrued Liabilities [Line Items]
Accrued liabilities	$606	$880
Revenue payable [Member]
Accrued Liabilities [Line Items]
Accrued liabilities	139	197
Accrued capital costs [Member]
Accrued Liabilities [Line Items]
Accrued liabilities	293	441
Accrued lease operating expenses [Member]
Accrued Liabilities [Line Items]
Accrued liabilities	41	47
Employee incentive expense [Member]
Accrued Liabilities [Line Items]
Accrued liabilities	28	62
Accrued interest on debt [Member]
Accrued Liabilities [Line Items]
Accrued liabilities	32	67
Taxes payable [Member]
Accrued Liabilities [Line Items]
Accrued liabilities	39	32
Other accrued liabilities [Member]
Accrued Liabilities [Line Items]
Accrued liabilities	$34	$34

Fair_Value_Measurements_Textua

Fair Value Measurements (Textuals) (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value				($26)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	340	38	384
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income		-25
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	-9
Money Market Funds, at Carrying Value	768		1
Deferred Compensation Plan Assets	5		9
Assets, Fair Value Disclosure	1,401		618
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	-26	-27
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			-39
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	70	2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	0
Obligations, Fair Value Disclosure	-27		-15
Oil contracts [Member]
Derivative Asset, Fair Value, Total	547
Oil contracts [Member] | Options Held [Member]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	-376
Oil contracts [Member] | Maximum [Member] | Options Held [Member]
Fair Value Assumptions Expected Volatility Curves	68.99%
Fair Value Inputs, Entity Credit Risk	2.10%
Oil contracts [Member] | Minimum [Member] | Options Held [Member]
Fair Value Assumptions Expected Volatility Curves	21.39%
Fair Value Inputs, Entity Credit Risk	0.01%
Natural gas contracts [Member]
Derivative Asset, Fair Value, Total	99
Natural gas contracts [Member] | Options Held [Member]
Derivative Asset, Fair Value, Total	44
Natural gas contracts [Member] | Maximum [Member] | Options Held [Member]
Fair Value Assumptions Expected Volatility Curves	54.28%
Fair Value Inputs, Entity Credit Risk	1.36%
Natural gas contracts [Member] | Minimum [Member] | Options Held [Member]
Fair Value Assumptions Expected Volatility Curves	23.44%
Fair Value Inputs, Entity Credit Risk	0.01%
Equity Securities [Member]
Available-for-sale Securities, Fair Value Disclosure	9		10
Auction Rate Securities [Member]
Proceeds from Sale of Available-for-sale Securities		39
Swap [Member]
Derivative Assets	978		994
Commodity Option [Member]
Derivative Liability	-332		-381
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member]
Money Market Funds, at Carrying Value	768		1
Deferred Compensation Plan Assets	5		9
Assets, Fair Value Disclosure	763		8
Obligations, Fair Value Disclosure	-19		-12
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Equity Securities [Member]
Available-for-sale Securities, Fair Value Disclosure	9		10
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Swap [Member]
Derivative Assets			0
Derivative Liability	0
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Commodity Option [Member]
Derivative Assets	0		0
Significant Other Observable Fair Value Inputs (Level 2) [Member]
Money Market Funds, at Carrying Value	0		0
Deferred Compensation Plan Assets	0		0
Assets, Fair Value Disclosure	978		994
Obligations, Fair Value Disclosure	0		0
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Equity Securities [Member]
Available-for-sale Securities, Fair Value Disclosure	0		0
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Swap [Member]
Derivative Assets	978		994
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Commodity Option [Member]
Derivative Assets	0		0
Fair Value, Inputs, Level 3 [Member]
Money Market Funds, at Carrying Value	0		0
Deferred Compensation Plan Assets	0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	340		384
Obligations, Fair Value Disclosure	-8		-3
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Available-for-sale Securities, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 3 [Member] | Swap [Member]
Derivative Assets			0
Derivative Liability	0
Fair Value, Inputs, Level 3 [Member] | Commodity Option [Member]
Derivative Liability	-332		-381
Investments [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0	0	0	-39
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			-39
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	0
Derivatives [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	332		381	8
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income		-11
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	-4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		-13
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	-21
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	70	2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	0
Stockholder Value Appreciation Program [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	8
Stock Compensation Plan [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	8	19	3	5
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Investment Income		-14
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	-5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		-14
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	-5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	0
Derivatives [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		19
5.75% Senior Notes Due 2022 [Member]
Debt Instrument, Fair Value Disclosure	789		772
5.625% Senior Notes Due 2024 [Member]
Debt Instrument, Fair Value Disclosure	1,041		989
5.375% Senior Notes Due 2026 [Member]
Debt Instrument, Fair Value Disclosure	709		0
6.875% Senior Subordinated Notes due 2020 [Member]
Debt Instrument, Fair Value Disclosure	$725		$721
Historical [Member] | Stockholder Value Appreciation Program [Member]
SBC Expected Volatility Rate, Maximum	46.70%

Valuation_of_Investments_and_F

Valuation of Investments and Financial Instrument Assets Liabilities By Pricing Levels (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Obligations, Fair Value Disclosure	$27	$15
Money market fund investments	768	1
Deferred Compensation Plan Assets	5	9
Total	1,401	618
Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	9	10
Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Oil and gas derivative contracts	978	994
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Obligations, Fair Value Disclosure	19	12
Money market fund investments	768	1
Deferred Compensation Plan Assets	5	9
Total	763	8
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	9	10
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Oil and gas derivative contracts		0
Quoted Prices In Active Markets for Identical Assets or Liabilities, Fair Value Inputs (Level 1) [Member] | Commodity Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Oil and gas derivative contracts	0	0
Significant Other Observable Fair Value Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Obligations, Fair Value Disclosure	0	0
Money market fund investments	0	0
Deferred Compensation Plan Assets	0	0
Total	978	994
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	0	0
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Oil and gas derivative contracts	978	994
Significant Other Observable Fair Value Inputs (Level 2) [Member] | Commodity Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Oil and gas derivative contracts	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Obligations, Fair Value Disclosure	8	3
Money market fund investments	0	0
Deferred Compensation Plan Assets	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	0	0
Fair Value, Inputs, Level 3 [Member] | Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Oil and gas derivative contracts		$0

Reconciliation_of_Changes_in_F

Reconciliation of Changes in Fair Value of Financial Assets and Liabilities Classified as Level Three In Fair Value Hierarchy (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	$0	$0
Beginning Balance		26
Included in earnings	-26	-27
Change in unrealized gains (losses) relating to investments and derivatives still held		-25
Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	0
Included in earnings		-13
Change in unrealized gains (losses) relating to investments and derivatives still held		-11
Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	0
Beginning Balance	0	39
Included in earnings	0	0
Settlements	0	0
Ending Balance	0	0
Change in unrealized gains (losses) relating to investments and derivatives still held	$0	$0

Quantitative_Information_about

Quantitative Information about Level 3 Fair Value Measurements (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability Value	-340	($384)	($38)
Stockholder Value Appreciation Program [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability Value	-8
Stockholder Value Appreciation Program [Member] | Historical [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
SBC Expected Volatility Rate, Maximum	46.70%
Natural gas contracts [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative Asset, Fair Value, Total	99
Oil contracts [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative Asset, Fair Value, Total	547
Options Held [Member] | Natural gas contracts [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative Asset, Fair Value, Total	44
Options Held [Member] | Natural gas contracts [Member] | Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Assumptions Expected Volatility Curves	54.28%
Credit Risk	1.36%
Options Held [Member] | Natural gas contracts [Member] | Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Assumptions Expected Volatility Curves	23.44%
Credit Risk	0.01%
Options Held [Member] | Oil contracts [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative Liability, Fair Value, Total	-376
Options Held [Member] | Oil contracts [Member] | Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Assumptions Expected Volatility Curves	68.99%
Credit Risk	2.10%
Options Held [Member] | Oil contracts [Member] | Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Assumptions Expected Volatility Curves	21.39%
Credit Risk	0.01%

Estimated_Fair_Value_of_Notes_

Estimated Fair Value of Notes Based on Quoted Market Prices (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
5.75% Senior Notes Due 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	$789	$772
5.625% Senior Notes Due 2024 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	1,041	989
6.875% Senior Subordinated Notes due 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	$725	$721

Debt_Details

Debt (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Debt Issuance Cost	$7,000,000
Line of Credit Facility, Amount Outstanding	0		446,000,000
Long-term debt	-3,146,000,000		-2,892,000,000
Net Proceeds Sr Notes Due 2026	690,000,000
Payments of Debt Issuance Costs	8,000,000	0
Debt (Textuals)
Line of Credit Facility, Maximum Borrowing Capacity	1,800,000,000		1,400,000,000
Largest individual loan commitment by any lender of total commitments	12.00%
Commitment fees incurred	1,000,000
Ratio of Indebtedness to Net Capital 1	0.6
Ratio of total debt to earnings before gain or loss on disposition of assets, interest expense, income taxes and noncash items	3
Line of Credit Facility, Current Borrowing Capacity	195,000,000
Percentage of basis points to be added for calculation of interest rate	0.50%
Percent added to prime rate based on grid of our debt rating	0.75%
Percentage added to LIBOR based on grid of our debt rating	1.75%
Commitment fee percentage on unused capacity of line of credit	0.30%
Issuance fees percentage on letter of credit	0.20%
Percentage based on a grid of our debt rating on which letters of credit fees are based.	1.75%
Revolving credit facility - LIBOR based loans
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	0		345,000,000
Money market lines of credit(1)
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	0		101,000,000
5.75% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	-750,000,000		-750,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.75%		5.75%
5.625% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	-1,000,000,000		-1,000,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.63%		5.63%
5.375% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	-700,000,000		0
Debt Instrument, Interest Rate, Stated Percentage	5.38%
Payments of Debt Issuance Costs	10,000,000
Total senior unsecured debt
Debt Instrument [Line Items]
Long-term debt	-2,450,000,000		-2,196,000,000
7.125% Senior Subordinated Notes due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.13%		7.13%
6.875% Senior Subordinated Notes due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	-700,000,000		-700,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.88%		6.88%
Discount on notes [Member]
Debt Instrument [Line Items]
Long-term debt	$4,000,000		$4,000,000

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income tax reconciliation to US federal statutory rate
Amount computed using the statutory rate	($266)	$17
Increase (decrease) in taxes resulting from:
State and local income taxes, net of federal effect	-17	2
Net effect of different tax rates in non-U.S. jurisdictions	2	2
Other	1	2
Total income tax provision (benefit)	($280)	$23
Income Taxes (Textuals) [Abstract]
Federal statutory tax rate	35.00%
Effective Income Tax Rate Reconciliation, Percent	36.80%	46.80%

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Gross	$22	$31
Capitalized in oil and gas properties	7	14
Net stock-based compensation expense	15	17
Obligations, Fair Value Disclosure	27		15
Number of restricted stock shares vested	93,000
Number of Restricted Stock Shares Granted	635,000
Number of restricted stock shares outstanding	3,218,000		2,847,000
Nonvested Awards, Total Compensation Cost Not yet Recognized	79
Liability Value	340	38	384
Liability Settlements	70	2
Stock-Based Compensation (Textuals) [Abstract]
Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	4 years
Last reported sales price of our common stock on the New York Stock Exchange per share	$35.09
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments	0
Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Gross	10	11
Stockholder Value Appreciation Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SVAP Incremental Price Threshold	$5
Share-based Compensation Gross	5	14
Service Period	0 years 9 months
Nonvested Awards, Total Compensation Cost Not yet Recognized	2
Weighted Average Volatility Rate	51.00%
Liability Value	8
Liability Settlements	11		13
Fair Value Assumptions, Risk Free Interest Rate	0.22%
Total Fair Value SVAP Awards	10
Stockholder Value Appreciation Program [Member] | $27.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SVAP Price Threshold	$27.50
Stockholder Value Appreciation Program [Member] | $32.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SVAP Price Threshold	$32.50
Stockholder Value Appreciation Program [Member] | $37.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SVAP Price Threshold	$37.50
Stockholder Value Appreciation Program [Member] | $42.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SVAP Price Threshold	$42.50
Cash-Settled Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Gross	7	6
Obligations, Fair Value Disclosure	19
Service Period	3 years 0 months 0 days
Number of restricted stock shares vested	2,000	283,000
Number of Restricted Stock Shares Granted	200,000
Number of restricted stock shares outstanding	1,300,000
Nonvested Awards, Total Compensation Cost Not yet Recognized	22
Liability Settlements		7
Liability [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Gross	$12	$20

StockBased_Compensation_Stock_

Stock-Based Compensation- Stock Option Activity (Details)	Mar. 31, 2015
Stock option activity
Outstanding, Beginning Balance, Number of Shares Underlying Options	200,000
Outstanding, Ending Balance, Number of Shares Underlying Options	200,000
Exercisable, Number of Shares Underlying Options	200,000

StockBased_Compensation_Stock_1

Stock-Based Compensation- Stock Option Summary (Details)	Mar. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Underlying Options	200,000
Options Exercisable, Number of Shares Underlying Options	200,000

StockBased_Compensation_Restri

Stock-Based Compensation- Restricted Stock and Restricted Stock Units Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Beginning balance	2,847,000
Granted	635,000
Forfeited	-171,000
Vested	-93,000
Non-vested shares outstanding, Ending balance	3,218,000
Non-vested shares outstanding, Weighted Average Grant Date Fair Value per Share, Beginning balance	$30.05
Granted, Weighted Average Grant Date Fair Value per Share	$25.12
Forfeited, Weighted Average Grant Date Fair Value per Share	$22.63
Vested, Weighted Average Grant Date Fair Value per Share	$44.47
Non-vested shares outstanding, Weighted Average Grant Date Fair Value per Share, Ending balance	$28.62
Service - Based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Beginning balance	1,902,000
Granted	221,000
Forfeited	-171,000
Vested	-53,000
Non-vested shares outstanding, Ending balance	1,899,000
Performance Market Based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Beginning balance	945,000
Granted	414,000
Forfeited	0
Vested	-40,000
Non-vested shares outstanding, Ending balance	1,319,000

StockBased_Compensation_Employ

Stock-Based Compensation- Employee Stock Purchase Plan (Details) (Employee Stock Purchase Plan [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Employee Stock Purchase Plan [Member]
Employee Stock Purchase Plan ESPP Disclosures [Line Items]
Options To Purchase Common Stock Shares	100,000
Weighted average fair value of each option	$7.93
Expected volatility	52.00%
Risk-free weighted average interest rate	0.12%
Vesting Period	0 years 6 months 0 days

Supplemental_Cash_Flows_Inform2

Supplemental Cash Flows Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]
Increase (Decrease) in Other Receivables	$7	$0
Non Cash Items Excluded From Statement of Cash Flows [Abstract]
(Increase) decrease in accrued capital expenditures	109	90
Increase in asset retirement costs	$3	$13

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	1 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Long-term Debt, Excluding Current Maturities		$3,146	$2,892
Subsequent Event [Member]
Subsequent Event [Line Items]
Redemption Premium	24
6.875% Senior Subordinated Notes due 2020 [Member]
Subsequent Event [Line Items]
Long-term Debt, Excluding Current Maturities		$700	$700
Debt Instrument, Interest Rate, Stated Percentage		6.88%	6.88%
Senior Subordinated Notes due 2018 [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.13%	7.13%

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
	MBbls	MBbls
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		$898
Gain on Sale of Malaysia, before Income Tax	0		388
Gain on Sale of Malaysia, Net of Tax		10	-252
Disposal Group, Including Discontinued Operation, Operating Income (Loss)			-21
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0		-257
Discontinued Operation, Tax Effect of Discontinued Operation			152
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	729	677
Less — accumulated depreciation, depletion and amortization	-8,380	-8,152
Disposal Group, Including Discontinued Operation, Revenue			90
Disposal Group, Including Discontinued Operation, Operating Expense			69
Disposal Group, Including Discontinued Operation, Operating Income (Loss)			-21
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	0		388
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		15	-409
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0		-257
Crude oil inventory in barrels	144,000	240,000
Energy Related Inventory, Petroleum	5	8
Current [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Discontinued Operation			12
Deferred [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Discontinued Operation			$140

Inventories_Details

Inventories (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified	MBbls	MBbls
Inventory Disclosure [Abstract]
Crude oil inventory in barrels	144,000	240,000
Energy Related Inventory, Petroleum	$5	$8

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Operating expenses:
Depreciation, depletion and amortization	$237	$224
Ceiling test impairment	792	0
Allocated income tax (benefit)	-280	23
Commodity derivative income (expense)	153	-96
Income (loss) before income taxes	-760	50
Total assets	9,678	8,651	9,598
Additions to long-lived assets	408	455
Domestic [Member]
Segment Information [Line Items]
Oil, gas and NGL revenues	303	553
Operating expenses:
Lease operating	65	72
Production and other taxes	13	25
Depreciation, depletion and amortization	212	188
General and administrative	61	56
Ceiling test impairment	792
Other	3	2
Allocated income tax (benefit)	-330	64
Net income (loss) from oil and gas properties	-562	109
Total assets	9,005	8,080
Additions to long-lived assets	396	438
Gas Gathering, Transportation, Marketing and Processing Costs	49	37
China [Member]
Operating expenses:
Ceiling test impairment	0
CHINA
Segment Information [Line Items]
Oil, gas and NGL revenues	46	18
Operating expenses:
Lease operating	10	2
Production and other taxes	0	3
Depreciation, depletion and amortization	25	4
General and administrative	2	0
Other	1	0
Allocated income tax (benefit)	5	5
Net income (loss) from oil and gas properties	3	4
Total assets	673	571
Additions to long-lived assets	12	17
Gas Gathering, Transportation, Marketing and Processing Costs	0	0
Continuing Operations [Member]
Segment Information [Line Items]
Oil, gas and NGL revenues	349	571
Operating expenses:
Lease operating	75	74
Production and other taxes	13	28
Depreciation, depletion and amortization	237	192
General and administrative	63	56
Ceiling test impairment	792
Other	4	2
Total operating expenses	1,233	389
Income (loss) from operations	-884	182
Interest expenses, net of interest income, capitalized interest and other	-29	-36
Commodity derivative income (expense)	153	-96
Income (loss) before income taxes	-760	50
Gas Gathering, Transportation, Marketing and Processing Costs	$49	$37

Equity_Offering_Details

Equity Offering (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Equity [Abstract]
Stock Issued During Period, Shares, New Issues	25.3
Stock Issued During Period, Value, New Issues	$815