CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues and Other
Natural-gas sales	$ 935	$ 496	$ 1,742	$ 1,069
Oil and condensate sales	1,995	2,222	4,372	4,466
Natural-gas liquids sales	261	282	564	624
Gathering, processing, and marketing sales	249	200	480	453
Gains (losses) on divestitures and other, net	57	22	232	57
Total	3,497	3,222	7,390	6,669
Costs and Expenses
Oil and gas operating	245	249	492	491
Oil and gas transportation and other	253	223	508	463
Exploration	178	1,121	442	1,365
Gathering, processing, and marketing	222	178	421	367
General and administrative	260	262	532	531
Depreciation, depletion, and amortization	940	1,027	1,962	1,957
Other taxes	245	326	525	703
Impairments	10	112	39	162
Algeria exceptional profits tax settlement			33	(1,804)
Deepwater Horizon settlement and related costs	4	3	7	11
Total	2,357	3,501	4,961	4,246
Operating Income (Loss)	1,140	(279)	2,429	2,423
Other (Income) Expense
Interest expense	172	190	336	376
(Gains) losses on derivatives, net	(656)	(44)	(465)	(328)
Other (income) expense, net	98	(519)	92	(254)
Total	(386)	(373)	(37)	(206)
Income (Loss) Before Income Taxes	1,526	94	2,466	2,629
Income tax expense (benefit)	567	164	1,023	516
Net Income (Loss)	959	(70)	1,443	2,113
Net income attributable to noncontrolling interests	30	19	54	46
Net Income (Loss) Attributable to Common Stockholders	$ 929	$ (89)	$ 1,389	$ 2,067
Per Common Share
Net income (loss) attributable to common stockholders—basic	$ 1.84	$ (0.18)	$ 2.75	$ 4.11
Net income (loss) attributable to common stockholders—diluted	$ 1.83	$ (0.18)	$ 2.74	$ 4.10
Average Number of Common Shares Outstanding—Basic	502	500	501	499
Average Number of Common Shares Outstanding—Diluted	504	500	504	501
Dividends (per Common Share)	$ 0.09	$ 0.09	$ 0.18	$ 0.18