CONSOLIDATED STATEMENTS OF INCOME (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
Revenues and Other
Natural-gas sales	$ 991	$ 935	$ 2,208	$ 1,742
Oil and condensate sales	2,705	1,995	5,129	4,372
Natural-gas liquids sales	411	261	797	564
Gathering, processing, and marketing sales	278	249	589	480
Gains (losses) on divestitures and other, net	54	57	1,560	232
Total	4,439	3,497	10,283	7,390
Costs and Expenses
Oil and gas operating	273	245	586	492
Oil and gas transportation and other	281	253	547	508
Exploration	502	178	801	442
Gathering, processing, and marketing	250	222	502	421
General and administrative	305	260	603	532
Depreciation, depletion, and amortization	1,048	940	2,172	1,962
Other taxes	361	245	675	525
Impairments	117	10	120	39
Algeria exceptional profits tax settlement	0	0	0	33
Deepwater Horizon settlement and related costs	93	4	93	7
Total	3,230	2,357	6,099	4,961
Operating Income (Loss)	1,209	1,140	4,184	2,429
Other (Income) Expense
Interest expense	186	172	369	336
Statement [Line Items]
(Gains) losses on derivatives, net			786	(460)
Other (income) expense, net	(13)	98	(12)	92
Tronox-related contingent loss	19	0	4,319	0
Total	515	(386)	5,452	(37)
Income (Loss) Before Income Taxes	694	1,526	(1,268)	2,466
Income tax expense (benefit)	428	567	1,092	1,023
Net Income (Loss)	266	959	(2,360)	1,443
Net income attributable to noncontrolling interests	39	30	82	54
Net Income (Loss) Attributable to Common Stockholders	227	929	(2,442)	1,389
Per Common Share
Net income (loss) attributable to common stockholders—basic	$ 0.45	$ 1.84	$ (4.84)	$ 2.75
Net income (loss) attributable to common stockholders—diluted	$ 0.45	$ 1.83	$ (4.84)	$ 2.74
Average Number of Common Shares Outstanding—Basic	505	502	505	501
Average Number of Common Shares Outstanding—Diluted	507	504	505	504
Dividends (per common share)	$ 0.27	$ 0.09	$ 0.45	$ 0.18
Commodity Contract and Interest Rate Swap [Member]
Statement [Line Items]
(Gains) losses on derivatives, net	$ 323	$ (656)	$ 776	$ (465)