Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues and other income:
Sales and other operating revenues, including related party	$ 3,440	$ 2,954
Marketing revenues	430	839
Income from equity method investments	118	78
Net gain on disposal of assets	109	166
Other income	9	3
Total revenues and other income	4,106	4,040
Costs and expenses:
Production	578	514
Marketing, including purchases from related parties	429	842
Other operating	111	92
Exploration	465	135
Depreciation, depletion and amortization	747	574
Impairments	38	262
Taxes other than income	84	68
General and administrative	174	159
Total costs and expenses	2,626	2,646
Income from operations	1,480	1,394
Net interest and other	(72)	(50)
Income before income taxes	1,408	1,344
Provision for income taxes	1,025	927
Net income	$ 383	$ 417
Basic:
Net income, per basic share	$ 0.54	$ 0.59
Diluted:
Net income, per diluted share	$ 0.54	$ 0.59
Dividends paid, per share	$ 0.17	$ 0.17
Weighted average common shares outstanding, basic	708	706
Weighted average common shares outstanding, diluted	712	710