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Derivative Financial Instruments and Risk Management (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Designated derivatives
   
Derivatives, Fair Value    
Asset (Liability) Fair Value $ 241 $ 242
Designated derivatives | Interest rate contracts | Other assets
   
Derivatives, Fair Value    
Asset Fair Value 252 248
Designated derivatives | Interest rate contracts | Accrued expenses
   
Derivatives, Fair Value    
Liability Fair Value (11) (6)
Undesignated derivatives
   
Derivatives, Fair Value    
Asset (Liability) Fair Value 0 (10)
Undesignated derivatives | Foreign exchange contracts | Other assets
   
Derivatives, Fair Value    
Asset Fair Value 9 7
Undesignated derivatives | Foreign exchange contracts | Accrued expenses
   
Derivatives, Fair Value    
Liability Fair Value (7) (16)
Undesignated derivatives | Interest rate contracts | Accrued expenses
   
Derivatives, Fair Value    
Liability Fair Value $ (2) $ (1)