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Derivative Financial Instruments (Details 1) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Foreign exchange contracts [Member]
Prepaid and other current assets [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Prepaid and other current assets [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2011
Foreign exchange contracts [Member]
Prepaid and other current assets [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Prepaid and other current assets [Member]
Not Designated as Hedging Instrument [Member]
Jun. 30, 2011
Foreign exchange contracts [Member]
Other Assets [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Other Assets [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2011
Foreign exchange contracts [Member]
Accrued liabilities [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Accrued liabilities [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2011
Foreign exchange contracts [Member]
Accrued liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2010
Foreign exchange contracts [Member]
Accrued liabilities [Member]
Not Designated as Hedging Instrument [Member]
Jun. 30, 2011
Foreign exchange contracts [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2010
Foreign exchange contracts [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
Jun. 30, 2011
Not Designated as Hedging Instrument [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Derivative Instruments and their Balance Sheet Classifications                                    
Derivative Assets $ 95 $ 47 $ 58 $ 28 $ 13 $ 7 $ 24 $ 12 $ 12 $ 12 $ 7 $ 10 $ 1 $ 1 $ 82 $ 40 $ 13 $ 7
Derivative Liabilities $ 20 $ 23                         $ 13 $ 13 $ 7 $ 10