STATEMENT OF CONSOLIDATED OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Oil and gas production revenues:
Oil and Gas Production Revenues	$ 3,647	$ 4,021
Derivative instrument losses, net	(20)	(100)
Other	48	25
Total revenues and other	3,675	3,946
Depreciation, depletion, and amortization:
Oil and gas property and equipment	1,109	1,210
Other assets	97	102
Asset retirement obligation accretion	44	63
Lease operating expenses	597	722
Gathering and transportation	70	73
Taxes other than income	181	229
General and administrative	119	112
Acquisitions, divestitures, and transition	2
Financing costs, net	27	55
Total operating expenses	2,246	2,566
NET INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,429	1,380
Current income tax provision	416	497
Deferred income tax provision	162	105
NET INCOME (LOSS) FROM CONTINUING OPERATIONS INCLUDING NONCONTROLLING INTEREST	851	778
Net loss from discontinued operations, net of tax	(517)	(61)
NET INCOME INCLUDING NONCONTROLLING INTEREST	334	717
Preferred stock dividends		19
Net income attributable to noncontrolling interest	98
Net income attributable to common shareholders	236	698
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS:
Net income from continuing operations attributable to common shareholders	753	759
Net loss from discontinued operations	(517)	(61)
Net income attributable to common shareholders	236	698
BASIC NET INCOME PER COMMON SHARE:
Basic net income from continuing operations per share	$ 1.92	$ 1.94
Basic net loss from discontinued operations per share	$ (1.32)	$ (0.16)
Basic net income per share	$ 0.60	$ 1.78
DILUTED NET INCOME PER COMMON SHARE:
Diluted net income from continuing operations per share	$ 1.90	$ 1.91
Diluted net loss from discontinued operations per share	$ (1.30)	$ (0.15)
Diluted net income per share	$ 0.60	$ 1.76
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic	394	392
Diluted	396	408
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.25	$ 0.20
Oil Reserves [Member]
Oil and gas production revenues:
Revenues	2,815	3,192
Natural Gas [Member]
Oil and gas production revenues:
Revenues	646	681
Natural Gas Liquids Revenues [Member]
Oil and gas production revenues:
Revenues	$ 186	$ 148