Consolidated Statements of Stockholders' Equity (USD $) In Millions, unless otherwise specified	Total		Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance at Dec. 31, 2010	$ 32,484		$ 177	$ (4,228)	$ 7,191	$ 29,868	$ (524)
Increase (Decrease) in Stockholders' Equity
Net income	6,771					6,771
Other comprehensive income (loss), net of tax	41	[1]					41
Dividends on common stock	(1,497)					(1,497)
Issuance of common stock and other, net	95				95
Purchases of treasury stock	(274)			(274)
Balance at Dec. 31, 2011	37,620		177	(4,502)	7,286	35,142	(483)
Increase (Decrease) in Stockholders' Equity
Net income	4,598					4,598
Other comprehensive income (loss), net of tax	(19)	[1]					(19)
Dividends on common stock	(1,750)					(1,750)
Issuance of common stock and other, net	156		1		155
Noncontrolling interest contributions	32							32	[2]
Purchases of treasury stock	(589)			(589)
Balance at Dec. 31, 2012	40,048		178	(5,091)	7,441	37,990	(502)	32
Increase (Decrease) in Stockholders' Equity
Net income	5,903					5,903
Other comprehensive income (loss), net of tax	199	[1]					199
Dividends on common stock	(2,062)					(2,062)
Issuance of common stock and other, net	74				74
Noncontrolling interest contributions	214							214	[2]
Purchases of treasury stock	(1,004)			(1,004)
Balance at Dec. 31, 2013	$ 43,372		$ 178	$ (6,095)	$ 7,515	$ 41,831	$ (303)	$ 246

[1] There were no other comprehensive income (loss) items related to noncontrolling interests in 2013, 2012 and 2011.

[2] Reflects contributions from the noncontrolling interest in a pipeline company.