Variable Interest Entities Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Variable Interest Entity [Line Items]
Assets	$ 43,573,000,000		$ 43,573,000,000		$ 37,990,000,000
Liabilities	37,015,000,000		37,015,000,000		31,705,000,000
Revenues	1,261,000,000	867,000,000	3,549,000,000	2,243,000,000
Net income	158,000,000	161,000,000	478,000,000	445,000,000
Transfers of Finance Receivables	2,700,000,000		2,700,000,000		2,800,000,000
Transfers of Finance Receivables Outstanding Balance	2,600,000,000		2,600,000,000		2,700,000,000
GERMANY | Subsidiaries [Member]
Variable Interest Entity [Line Items]
Assets	4,700,000,000		4,700,000,000		3,900,000,000
Liabilities	3,900,000,000		3,900,000,000		3,000,000,000
Revenues	30,000,000		148,000,000
Net income	$ 8,000,000		$ 29,000,000