STATEMENT OF CONSOLIDATED OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Oil and gas production revenues
Oil and gas production revenues	$ 3,708	$ 4,001	$ 7,355	$ 8,022
Derivative instrument gains (losses), net	(174)	247	(194)	147
Other	(50)	20	(2)	45
Total revenues and other	3,484	4,268	7,159	8,214
Oil and gas property and equipment
Depreciation, depletion and amortization	1,457	1,350	2,663	2,662
Asset retirement obligation accretion	45	64	89	127
Lease operating expenses	613	781	1,210	1,503
Gathering and transportation	66	77	136	150
Taxes other than income	181	170	362	399
General and administrative	94	126	199	238
Acquisition, divestiture, and separation costs	14		30
Financing costs, net	35	52	62	107
Total operating expenses	2,505	2,620	4,751	5,186
NET INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	979	1,648	2,408	3,028
Current income tax provision	325	284	741	781
Deferred income tax provision	41	327	203	432
NET INCOME (LOSS) FROM CONTINUING OPERATIONS INCLUDING NONCONTROLLING INTEREST	613	1,037	1,464	1,815
Net loss from discontinued operations, net of tax	0	(2)	(517)	(63)
NET INCOME INCLUDING NONCONTROLLING INTEREST	613	1,035	947	1,752
Preferred stock dividends	0	19	0	38
Net income attributable to noncontrolling interest	108		206
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	505	1,016	741	1,714
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS:
Net income from continuing operations attributable to common shareholders	505	1,018	1,258	1,777
Net loss from discontinued operations	0	(2)	(517)	(63)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	505	1,016	741	1,714
NET INCOME PER COMMON SHARE:
Basic net income from continuing operations per share	$ 1.31	$ 2.60	$ 3.23	$ 4.53
Basic net loss from discontinued operations per share	$ 0.00	$ (0.01)	$ (1.33)	$ (0.16)
Basic net income per share	$ 1.31	$ 2.59	$ 1.90	$ 4.37
DILUTED NET INCOME PER COMMON SHARE:
Diluted net income from continuing operations per share	$ 1.31	$ 2.54	$ 3.21	$ 4.45
Diluted net loss from discontinued operations per share	$ 0.00		$ (1.32)	$ (0.15)
Diluted net income per share	$ 1.31	$ 2.54	$ 1.89	$ 4.30
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic	385	392	390	392
Diluted	387	408	392	408
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.25	$ 0.20	$ 0.50	$ 0.40
Other Assets [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	99	92	196	194
Oil And Gas Property And Equipment Recurring [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	1,155	1,258	2,264	2,468
Oil And Gas Property And Equipment Additional [Member]
Oil and gas property and equipment
Depreciation, depletion and amortization	203		203
Oil Reserves [Member]
Oil and gas production revenues
Revenues	2,950	3,130	5,765	6,322
Natural Gas [Member]
Oil and gas production revenues
Revenues	589	721	1,235	1,402
Natural Gas Liquids Revenues [Member]
Oil and gas production revenues
Revenues	$ 169	$ 150	$ 355	$ 298