Transfers of Receivables - Derivative Income and Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	$ (148)	$ (352)	$ 33
Securitization Transactions [Member]
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	25	239	61
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	3	227	31
Related to Variable Interest Entity - Not VIE [Member] | Securitization Transactions [Member]
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	16	(5)	11
Other, Not Variable Interest Entity Related [Member] | Securitization Transactions [Member]
Derivative expense/(income) related to securitization transactions [Abstract]
Derivative expense/(income)	$ 6	$ 17	$ 19