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 income:
Sales and other operating revenues, including related party	$ 3,419	$ 2,975	$ 6,859	$ 5,919
Marketing revenues	499	757	929	1,606
Income from equity method investments	77	60	195	138
Net gain (loss) on disposal of assets	(107)	(28)	2	138
Other income	10	20	19	23
Total revenues and other income	3,898	3,784	8,004	7,824
Costs and expenses:
Production	614	485	1,192	987
Marketing, including purchases from related parties	495	755	924	1,609
Other operating	86	107	197	199
Exploration	133	172	598	307
Depreciation, depletion and amortization	738	580	1,485	1,154
Impairments	0	1	38	263
Taxes other than income	93	55	177	123
General and administrative	164	154	338	313
Total costs and expenses	2,323	2,309	4,949	4,955
Income from operations	1,575	1,475	3,055	2,869
Net interest and other	(71)	(57)	(143)	(107)
Income before income taxes	1,504	1,418	2,912	2,762
Provision for income taxes	1,078	1,025	2,103	1,952
Net income	$ 426	$ 393	$ 809	$ 810
Basic:
Net income, per basic share	$ 0.60	$ 0.56	$ 1.14	$ 1.15
Diluted:
Net income, per diluted share	$ 0.60	$ 0.56	$ 1.14	$ 1.14
Dividends paid, per share	$ 0.17	$ 0.17	$ 0.34	$ 0.34
Weighted average common shares outstanding, basic	710	706	709	705
Weighted average common shares outstanding, diluted	714	709	713	709