Statement of Consolidated Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Oil and gas production revenues
Oil and gas production revenues	$ 1,572	$ 3,181	$ 5,162	$ 10,043
Derivative instrument gains, net		273		79
Other	(76)	(13)	(59)	(4)
Total revenues and other	1,496	3,441	5,103	10,118
Oil and gas property and equipment
Depreciation, depletion and amortization	6,629	2,735	21,753	5,193
Asset retirement obligation accretion	37	39	109	115
Lease operating expenses	450	588	1,398	1,696
Gathering and transportation	58	67	163	203
Taxes other than income	104	124	232	482
Impairments	367		367
General and administrative	86	111	279	332
Transaction, reorganization, and separation		34	120	66
Financing costs, net	107	60	240	157
Total operating expenses	7,838	3,758	24,661	8,244
NET INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(6,342)	(317)	(19,558)	1,874
Current income tax provision (benefit)	(84)	228	496	968
Deferred income tax provision (benefit)	(707)	540	(5,167)	684
NET INCOME (LOSS) FROM CONTINUING OPERATIONS INCLUDING NONCONTROLLING INTEREST	(5,551)	(1,085)	(14,887)	222
Net loss from discontinued operations, net of tax	(95)	(156)	(959)	(516)
NET LOSS INCLUDING NONCONTROLLING INTEREST	(5,646)	(1,241)	(15,846)	(294)
Net income attributable to noncontrolling interest	9	89	60	295
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	(5,655)	(1,330)	(15,906)	(589)
NET LOSS ATTRIBUTABLE TO COMMON SHAREHOLDERS:
Net loss from continuing operations attributable to common shareholders	(5,560)	(1,174)	(14,947)	(73)
Net loss from discontinued operations	(95)	(156)	(959)	(516)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ (5,655)	$ (1,330)	$ (15,906)	$ (589)
NET LOSS PER COMMON SHARE:
Basic net loss from continuing operations per share	$ (14.70)	$ (3.08)	$ (39.58)	$ (0.19)
Basic net loss from discontinued operations per share	(0.25)	(0.42)	(2.54)	(1.33)
Basic net loss per share	(14.95)	(3.50)	(42.12)	(1.52)
DILUTED NET LOSS PER COMMON SHARE:
Diluted net loss from continuing operations per share	(14.70)	(3.08)	(39.58)	(0.19)
Diluted net loss from discontinued operations per share	(0.25)	(0.42)	(2.54)	(1.33)
Diluted net loss per share	$ (14.95)	$ (3.50)	$ (42.12)	$ (1.52)
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic	378	381	378	387
Diluted	378	381	378	387
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.25	$ 0.25	$ 0.75	$ 0.75
Other Assets [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	$ 79	$ 87	$ 245	$ 246
Oil and Gas Property and Equipment Recurring [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	829	1,086	2,751	3,182
Oil and Gas Property and Equipment Additional [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	5,721	1,562	18,757	1,765
Oil Reserves [Member]
Oil and gas production revenues
Revenues	1,213	2,553	4,092	7,995
Natural Gas [Member]
Oil and gas production revenues
Revenues	309	451	904	1,516
Natural Gas Liquids [Member]
Oil and gas production revenues
Revenues	$ 50	$ 177	$ 166	$ 532