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Derivative Financial Instruments (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets $ 26 $ 47
Derivative Liabilities 96 23
Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 17 40
Derivative Liabilities 75 13
Not Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 9 7
Derivative Liabilities 21 10
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 16 28
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Not Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 9 7
Foreign exchange contracts [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 1 12
Foreign exchange contracts [Member] | Accrued liabilities [Member] | Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Liabilities 62 12
Foreign exchange contracts [Member] | Accrued liabilities [Member] | Not Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Liabilities 21 10
Foreign exchange contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Liabilities $ 13 $ 1