Net Investments in Operating Leases (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Property Subject to or Available for Operating Lease [Line Items]
Length of lease contract	60 months or less
Vehicles, at cost, including initial direct costs	$ 25,687	$ 24,952
Less: Accumulated depreciation	(3,662)	(3,396)
Net investment in operating leases before allowance for credit losses	22,025	21,556	18,856
Less: Allowance for credit losses	(41)	(38)	(24)	(23)
Net investment in operating leases	21,984	21,518	18,832
Securitization Transactions [Member]
Property Subject to or Available for Operating Lease [Line Items]
Net investment in operating leases	$ 10,100	$ 9,600