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Derivative Instruments and Fair Value Measurements (Details) (Recurring, Level 2, Designated as hedging instruments, USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair value of derivative instruments    
Derivative Asset, Fair Value $ 21 $ 31
Derivative Liability, Fair Value (10) (12)
Interest rate exchange contracts | Fair Value Hedges | Other assets | Finance group
   
Fair value of derivative instruments    
Derivative Asset, Fair Value 16 22
Interest rate exchange contracts | Fair Value Hedges | Other liabilities | Finance group
   
Fair value of derivative instruments    
Derivative Liability, Fair Value (9) (7)
Foreign currency exchange contracts | Cash Flow Hedges | Other current assets | Manufacturing group
   
Fair value of derivative instruments    
Foreign currency exchange contracts 5 9
Foreign currency exchange contracts | Cash Flow Hedges | Accrued liabilities | Manufacturing group
   
Fair value of derivative instruments    
Foreign currency exchange contracts $ (1) $ (5)