Leased Vehicles (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Property Subject to or Available for Operating Lease, Net [Abstract]
Property Subject to or Available for Operating Lease, Gross	$ 5,189	$ 4,684
Manufacturing incemtives	(733)	(659)
Leased Vehicles Accounted For Operating Leases Net Of Manufacturing Incentives	4,456	4,025	2,444	1,976
Property Subject to or Available for Operating Lease, Accumulated Depreciation	(730)	(642)
Leased vehicles, net	$ 3,726	$ 3,383