Revenue Earning Equipment (Depreciation Rate Changes) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue Earning Equipment [Line Items]
Depreciation rate changes	$ 27	$ 38	$ 57	$ 77
U.S. Car Rental
Revenue Earning Equipment [Line Items]
Depreciation rate changes	27	37	57	76
International Car Rental
Revenue Earning Equipment [Line Items]
Depreciation rate changes	$ 0	$ 1	$ 0	$ 1