Condensed Consolidated Statements Of Equity (USD $) In Millions, except Share data	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Foreign Currency Adjustments [Member]	Net Gains (Losses) on Cash Flow Hedges [Member]	Other [Member]	Pension And OPEB Related Adjustments To AOCI [Member]	Common Stockholders' Equity [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2010	$ 22,653	$ 1	$ 21,023	$ 1,496	$ 97	$ (18)	$ (17)	$ (60)	$ 22,522	$ 131
Balance (in shares) at Dec. 31, 2010	443,000,000
Net income	954			946					946	8
Other comprehensive income, net of tax	90				93	(3)	4	(7)	87	3
Total comprehensive income	1,044
Common stock issuances, including dividend reinvestment and employee benefits (in shares)	1,000,000
Common stock issuances, including dividend reinvestment and employee benefits	22		22						22
Common stock dividends	994			994					994
Changes in noncontrolling interest in subsidiaries	(23)									(23)
Balance at Jun. 30, 2011	22,702	1	21,045	1,448	190	(21)	(13)	(67)	22,583	119
Balance (in shares) at Jun. 30, 2011	444,000,000
Balance at Dec. 31, 2011	22,865	1	21,132	1,873	(45)	(71)	(9)	(109)	22,772	93
Balance (in shares) at Dec. 31, 2011	445,000,000
Net income	747			739					739	8
Other comprehensive income, net of tax	(90)				(83)	(15)	6	6	(86)	(4)
Total comprehensive income	657
Common stock issuances, including dividend reinvestment and employee benefits (in shares)	1,000,000
Common stock issuances, including dividend reinvestment and employee benefits	8		8						8
Common stock dividends	1,014			1,014					1,014
Changes in noncontrolling interest in subsidiaries	0									0
Balance at Jun. 30, 2012	$ 22,516	$ 1	$ 21,140	$ 1,598	$ (128)	$ (86)	$ (3)	$ (103)	$ 22,419	$ 97
Balance (in shares) at Jun. 30, 2012	446,000,000