Revenue Earning Vehicles (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Revenue Earning Equipment [Line Items]
Revenue earning vehicles	$ 14,022		$ 14,022		$ 13,242
Less: Accumulated depreciation	(2,614)		(2,614)		(2,631)
Property Subject to or Available for Operating Lease, Excluding Assets Held for Sale	11,408		11,408		10,611
Revenue earning vehicles held for sale, net	300		300		135
Revenue earning vehicles, net	11,708		11,708		$ 10,746
Depreciation of revenue earning equipment	631	$ 581	1,766	$ 1,747
(Gain) loss on disposal of revenue earning equipment	44	32	121	56
Rents paid for vehicles leased	20	18	53	56
Depreciation of revenue earning equipment and lease charges, net	695	631	1,940	1,859
U.S. Rental Car
Revenue Earning Equipment [Line Items]
(Gain) loss on disposal of revenue earning equipment	43	34	124	59
Depreciation of revenue earning equipment and lease charges, net	462	399	1,298	1,200
International Rental Car
Revenue Earning Equipment [Line Items]
(Gain) loss on disposal of revenue earning equipment	1	(2)	(3)	(3)
Depreciation of revenue earning equipment and lease charges, net	$ 116	$ 114	$ 300	$ 310