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Transfers of Receivables - Exposure Based on Fair Value of Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets $ 1,256 $ 1,365
Fair Value of Derivative Liabilities 400 286
Variable Interest Entity, Primary Beneficiary [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 4 157
Fair Value of Derivative Liabilities 134 97
Securitization Transactions [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 89 250
Fair Value of Derivative Liabilities 219 185
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 4 157
Fair Value of Derivative Liabilities 134 97
Related to Variable Interest Entity - Not VIE [Member] | Securitization Transactions [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 74 81
Fair Value of Derivative Liabilities 63 63
Other, Not Variable Interest Entity Related [Member] | Securitization Transactions [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 11 12
Fair Value of Derivative Liabilities $ 22 $ 25