Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Defined Benefit Plan, Fair Value of Plan Assets	$ 8,714		$ 9,359
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,738		2,513
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	4,454		4,819
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	2,522		2,027
Equity Securities [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	796		1,427
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Equity Securities [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	910		1,090
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	796		1,402
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	875		1,058
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		25
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	35		32
Mutual Funds [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	18		1
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Mutual Funds [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	246		0
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Mutual Funds [Member] | Non-U.S. Emerging Markets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	2		314
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Mutual Funds [Member] | Diversified Fixed Income [Member]
Defined Benefit Plan, Fair Value of Plan Assets	426		222
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Mutual Funds [Member] | High Yield [Member]
Defined Benefit Plan, Fair Value of Plan Assets	58		209
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)(c)	[1],[2]	(a)(c)	[1],[2]
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		1
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	21		0
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Non-U.S. Emerging Markets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Diversified Fixed Income [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | High Yield [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	18		0
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	225		0
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Non-U.S. Emerging Markets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	2		314
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Diversified Fixed Income [Member]
Defined Benefit Plan, Fair Value of Plan Assets	426		222
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | High Yield [Member]
Defined Benefit Plan, Fair Value of Plan Assets	58		209
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Non-U.S. Emerging Markets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Diversified Fixed Income [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | High Yield [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	917		1,776
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Commingled Funds [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	783		514
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Commingled Funds [Member] | Non-U.S. Emerging Markets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		135
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Commingled Funds [Member] | Diversified Fixed Income [Member]
Defined Benefit Plan, Fair Value of Plan Assets	776		458
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Commingled Funds [Member] | High Yield [Member]
Defined Benefit Plan, Fair Value of Plan Assets	92		93
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Commingled Funds [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Non-U.S. Emerging Markets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Diversified Fixed Income [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 1 [Member] | High Yield [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	917		1,776
Commingled Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	783		514
Commingled Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Non-U.S. Emerging Markets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		135
Commingled Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Diversified Fixed Income [Member]
Defined Benefit Plan, Fair Value of Plan Assets	776		458
Commingled Funds [Member] | Fair Value, Inputs, Level 2 [Member] | High Yield [Member]
Defined Benefit Plan, Fair Value of Plan Assets	92		93
Commingled Funds [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Non-U.S. [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Non-U.S. Emerging Markets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Diversified Fixed Income [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Commingled Funds [Member] | Fair Value, Inputs, Level 3 [Member] | High Yield [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Private Equity Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,620		1,559
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)(c)	[1],[2]	(a)(c)	[1],[2]
Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	1,620		1,559
Real Estate [Member]
Defined Benefit Plan, Fair Value of Plan Assets	424		396
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)(c)	[1],[2]	(a)(c)	[1],[2]
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	424		396
Hedge Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	432		0
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)(c)	[1],[2]		[1],[2]
Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	432		0
Fixed Income Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	764		551
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)(c)	[1],[2]	(a)(c)	[1],[2]
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	753		511
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	11		40
Foreign Exchange Contract [Member] | Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	738		879
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Foreign Exchange Contract [Member] | Liabilities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	(735)		(874)
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] | Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] | Liabilities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	738		879
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Liabilities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	(735)		(874)
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Liabilities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	0		0
Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets	447		609
Defined Benefit Plan Fair Value Of Plan Assets Valuation Technique	(a)	[1]	(a)	[1]
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	46		52
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	401		557
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0		$ 0

[1] (a)Market approach. Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities

[2] (c)Income approach. Techniques to convert future amounts to a single present amount based on market expectations (including present value techniques, option-pricing and excess earnings models)