Variable Interest Entities Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Variable Interest Entity [Line Items]
Assets	$ 42,359,000,000		$ 42,359,000,000		$ 37,990,000,000
Liabilities	35,692,000,000		35,692,000,000		31,705,000,000
Revenues	1,191,000,000	836,000,000	2,288,000,000	1,376,000,000
Net income	175,000,000	178,000,000	320,000,000	284,000,000
Transfers of Finance Receivables	2,900,000,000		2,900,000,000		2,800,000,000
Transfers of Finance Receivables Outstanding Balance	2,700,000,000		2,700,000,000		2,700,000,000
GERMANY | Subsidiaries [Member]
Variable Interest Entity [Line Items]
Assets	4,000,000,000		4,000,000,000		3,900,000,000
Liabilities	3,200,000,000		3,200,000,000		3,000,000,000
Revenues	60,000,000		118,000,000
Net income	$ 11,000,000		$ 21,000,000