Condensed Consolidated Statements Of Equity And Comprehensive Income (USD $) In Millions, except Share data, unless otherwise specified		Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Foreign Currency Adjustments [Member]	Net (Losses) Gains On Cash Flow Hedges [Member]	Other Equity [Member]	Pension And OPEB Related Adjustments To AOCI [Member]	Common Stockholders' Equity [Member]	Noncontrolling Interests [Member]	Total
Balance at Dec. 31, 2008		$ 1	$ 20,106	$ 1,607	$ (306)	$ (41)	$ (28)	$ (351)	$ 20,988	$ 163	$ 21,151
Balance (in shares) at Dec. 31, 2008		1,272,000,000
Net income (loss)				1,075					1,075	10	1,085
Other comprehensive income (loss)
Foreign currency translation adjustments					323				323	18	341
Net unrealized gains (losses) on cash flow hedges	[1]					1			1		1
Reclassification into earnings from cash flow hedges	[2]					18			18		18
Pension and OPEB related adjustments to AOCI	[3]							36	36		36
Net Actuarial loss	[4]							(21)	(21)		(21)
Reclassification of gains on investments in available-for-sale securities into earnings	[5]						(5)		(5)		(5)
Unrealized Gain (Loss) on Investments in available-for-sale securities	[6]						8		8		8
Unrealized gain on investments in auction rate securities	[7]						(6)		(6)		(6)
Total comprehensive income (loss)									1,429	28	1,457
Common stock issuances, including dividend reinvestment and employee benefits			546						546		546
Common stock issuances, including dividend reinvestment and employee benefits (in shares)		37,000,000
Common stock dividends				(1,222)					(1,222)		(1,222)
Changes in noncontrolling interest in subsidiaries	[8]		14						14	(55)	(41)
Other			(5)						(5)		(5)
Balance at Dec. 31, 2009		1	20,661	1,460	17	(22)	(31)	(336)	21,750	136	21,886
Balance (in shares) at Dec. 31, 2009		1,309,000,000
Net income (loss)				1,320					1,320	3	1,323
Other comprehensive income (loss)
Foreign currency translation adjustments					80				80	(1)	79
Net unrealized gains (losses) on cash flow hedges	[1]					1			1		1
Reclassification into earnings from cash flow hedges	[2]					3			3		3
Pension and OPEB related adjustments to AOCI	[3]							276	276		276
Unrealized gain on investments in auction rate securities	[7]						14		14		14
Total comprehensive income (loss)									1,694	2	1,696
Common stock issuances, including dividend reinvestment and employee benefits			362						362		362
Common stock issuances, including dividend reinvestment and employee benefits (in shares)		20,000,000
Common stock dividends				(1,284)					(1,284)		(1,284)
Changes in noncontrolling interest in subsidiaries	[8]									(7)	(7)
Balance at Dec. 31, 2010		1	21,023	1,496	97	(18)	(17)	(60)	22,522	131	22,653
Balance (in shares) at Dec. 31, 2010		1,329,000,000									1,329,000,000
Net income (loss)				1,706					1,706	8	1,714
Other comprehensive income (loss)
Foreign currency translation adjustments					(142)				(142)	(7)	(149)
Net unrealized gains (losses) on cash flow hedges	[1]					(57)			(57)		(57)
Reclassification into earnings from cash flow hedges	[2]					4			4		4
Pension and OPEB related adjustments to AOCI	[3]							(49)	(49)		(49)
Reclassification of gains on investments in available-for-sale securities into earnings	[5]						(4)		(4)		(4)
Unrealized Gain (Loss) on Investments in available-for-sale securities	[6]						4		4		4
Unrealized gain on investments in auction rate securities	[7]						8		8		8
Total comprehensive income (loss)									1,470	1	1,471
Common stock issuances, including dividend reinvestment and employee benefits			109						109		109
Common stock issuances, including dividend reinvestment and employee benefits (in shares)		7,000,000
Common stock dividends				(1,329)					(1,329)		(1,329)
Changes in noncontrolling interest in subsidiaries	[8]									(39)	(39)
Balance at Dec. 31, 2011		$ 1	$ 21,132	$ 1,873	$ (45)	$ (71)	$ (9)	$ (109)	$ 22,772	$ 93	$ 22,865
Balance (in shares) at Dec. 31, 2011		1,336,000,000									1,336,000,000

[1] Net of $31 tax benefit in 2011, $1 tax expense in 2010, and $1 tax expense in 2009.

[2] Net of $1 tax expense in 2011, insignificant tax expense in 2010 and $10 tax expense in 2009.

[3] Net of $23 tax benefit in 2011, $150 tax expense in 2010 and $16 tax expense in 2009.

[4] Net of $12 tax benefit in 2009.

[5] Net of $2 tax benefit in 2011 and $2 tax expense in 2009.

[6] Net of $3 tax expense in 2011 and $4 tax expense in 2009.

[7] Net of $4 tax expense in 2011, $8 tax expense in 2010 and $4 tax benefit in 2009.

[8] Includes $26, $10, and $37 in cash distributions to noncontrolling interests in 2011, 2010, and 2009 respectively.