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Derivative Financial Instruments (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets $ 78 $ 26
Derivative Liabilities 33 96
Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 51 17
Derivative Liabilities 20 75
Not Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 27 9
Derivative Liabilities 13 21
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 40 16
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 27 9
Foreign exchange contracts [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Assets 11 1
Foreign exchange contracts [Member] | Accrued liabilities [Member] | Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Liabilities 19 62
Foreign exchange contracts [Member] | Accrued liabilities [Member] | Not Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Liabilities 13 21
Foreign exchange contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
   
Derivative Instruments and their Balance Sheet Classifications    
Derivative Liabilities $ 1 $ 13