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Transfers of Receivables - Exposure Based on Fair Value of Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets $ 784 $ 1,256
Fair Value of Derivative Liabilities 380 400
Variable Interest Entity, Primary Beneficiary [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 36 4
Fair Value of Derivative Liabilities 40 134
Securitization Transactions [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 81 89
Fair Value of Derivative Liabilities 88 219
Variable Interest Entity, Primary Beneficiary [Member] | Securitization Transactions [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 36 4
Fair Value of Derivative Liabilities 40 134
Related to Variable Interest Entity - Not VIE [Member] | Securitization Transactions [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 39 74
Fair Value of Derivative Liabilities 40 63
Other, Not Variable Interest Entity Related [Member] | Securitization Transactions [Member]
   
Securitization Transactions [Line Items]    
Fair Value of Derivative Assets 6 11
Fair Value of Derivative Liabilities $ 8 $ 22