Statement of Consolidated Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Oil and gas production revenues
Oil and gas production revenues	$ 1,952	$ 3,471	$ 3,590	$ 6,862
Derivative instrument gains (losses), net		(174)		(194)
Other	25	(8)	17	9
Total revenues and other	1,977	3,289	3,607	6,677
Oil and gas property and equipment
Depreciation, depletion and amortization	6,822	1,358	15,124	2,458
Asset retirement obligation accretion	36	38	72	76
Lease operating expenses	467	560	948	1,108
Gathering and transportation	49	66	105	136
Taxes other than income	55	177	128	358
General and administrative	111	113	193	221
Transaction, reorganization, and separation costs	66	14	120	32
Financing costs, net	63	52	133	97
Total operating expenses	7,669	2,378	16,823	4,486
NET INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(5,692)	911	(13,216)	2,191
Current income tax provision	665	373	580	740
Deferred income tax provision (benefit)	(1,525)	(19)	(4,460)	144
NET INCOME (LOSS) FROM CONTINUING OPERATIONS INCLUDING NONCONTROLLING INTEREST	(4,832)	557	(9,336)	1,307
Net income (loss) from discontinued operations, net of tax	(732)	56	(864)	(360)
NET INCOME (LOSS) INCLUDING NONCONTROLLING INTEREST	(5,564)	613	(10,200)	947
Net income attributable to noncontrolling interest	36	108	51	206
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	(5,600)	505	(10,251)	741
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS:
Net income (loss) from continuing operations attributable to common shareholders	(4,868)	449	(9,387)	1,101
Net income (loss) from discontinued operations	(732)	56	(864)	(360)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ (5,600)	$ 505	$ (10,251)	$ 741
NET INCOME (LOSS) PER COMMON SHARE:
Basic net income (loss) from continuing operations per share	$ (12.89)	$ 1.17	$ (24.88)	$ 2.83
Basic net income (loss) from discontinued operations per share	(1.94)	0.14	(2.29)	(0.93)
Basic net income (loss) per share	(14.83)	1.31	(27.17)	1.90
DILUTED NET INCOME (LOSS) PER COMMON SHARE:
Diluted net income (loss) from continuing operations per share	(12.89)	1.17	(24.88)	2.82
Diluted net income (loss) from discontinued operations per share	(1.94)	0.14	(2.29)	(0.93)
Diluted net income (loss) per share	$ (14.83)	$ 1.31	$ (27.17)	$ 1.89
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic	378	385	377	390
Diluted	378	387	377	392
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.25	$ 0.25	$ 0.50	$ 0.50
Other Assets [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	$ 83	$ 81	$ 166	$ 159
Oil and Gas Property and Equipment Recurring [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	923	1,074	1,922	2,096
Oil and Gas Property and Equipment Additional [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	5,816	203	13,036	203
Oil Reserves [Member]
Oil and gas production revenues
Revenues	1,599	2,797	2,879	5,442
Natural Gas [Member]
Oil and gas production revenues
Revenues	295	505	595	1,065
Natural Gas Liquids [Member]
Oil and gas production revenues
Revenues	$ 58	$ 169	$ 116	$ 355