Net Investments in Operating Leases Net Investments in Operating Leases (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Property Subject to or Available for Operating Lease [Line Items]
Vehicles, at cost, including initial direct costs	$ 16,566		$ 13,545
Less: Accumulated depreciation	(2,591)		(2,407)
Net investment in operating leases before allowance for credit losses	13,975		11,138	10,455
Less: Allowance for credit losses	(26)	(26)	(40)	(51)	(64)	(87)
Net investment in operating leases	13,949		11,098	10,404
Securitization Transactions [Member]
Property Subject to or Available for Operating Lease [Line Items]
Net investment in operating leases	$ 5,100		$ 6,400