Financial Instruments Fair Value Of Foreign Exchange Contracts (Details) (Foreign Exchange Contract [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivatives, Asset Derivatives, Fair Value	$ 144	$ 145
Derivatives, Liability Derivatives, Fair Value	64	66
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Asset Derivatives, Fair Value	91	57
Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Liability Derivatives, Fair Value	6	4
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Asset Derivatives, Fair Value	3	0
Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Liability Derivatives, Fair Value	1	0
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange contracts not designated as hedging instruments, Asset Derivatives, Fair Value	50	88
Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange contracts not designated as hedging instruments, Liability Derivatives, Fair Value	56	62
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange contracts not designated as hedging instruments, Liability Derivatives, Fair Value	$ 1