Selected Quarterly Financial Data (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 2,117	$ 2,069	$ 2,020	$ 2,067	$ 2,137	$ 2,206	$ 2,153	$ 2,227	$ 8,273	$ 8,723	$ 10,147
Depreciation on vehicles subject to operating leases	(660)	(640)	(583)	(585)	(538)	(464)	(361)	(411)	(2,468)	(1,774)	(1,945)
Interest expense	(709)	(741)	(774)	(803)	(831)	(888)	(895)	(893)	(3,027)	(3,507)	(4,222)
Total financing margin and other revenue	748	688	663	679	768	854	897	923	2,778	3,442	3,980
Provision for credit losses	40	42	(51)	(24)	(9)	(20)	(25)	(64)	7	(118)	(269)
Net income	$ 268	$ 355	$ 296	$ 295	$ 611	$ 350	$ 383	$ 451	$ 1,214	$ 1,795	$ 1,948