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Derivative Instruments and Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Fair value of derivative instruments    
Derivative Asset, Fair Value $ 32 $ 31
Derivative Liability, Fair Value (11) (12)
Interest rate exchange contracts [Member] | Fair Value Hedging [Member] | Other Assets [Member] | Finance Group [Member]
   
Fair value of derivative instruments    
Derivative Asset, Fair Value 19 22
Interest rate exchange contracts [Member] | Fair Value Hedging [Member] | Other Liabilities [Member] | Finance Group [Member]
   
Fair value of derivative instruments    
Derivative Liability, Fair Value (7) (7)
Foreign currency exchange contracts [Member] | Cash Flow Hedging [Member] | Other Current Assets [Member] | Manufacturing Group [Member]
   
Fair value of derivative instruments    
Foreign currency exchange contracts 13 9
Foreign currency exchange contracts [Member] | Cash Flow Hedging [Member] | Accrued Liabilities [Member] | Manufacturing Group [Member]
   
Fair value of derivative instruments    
Foreign currency exchange contracts $ (4) $ (5)