Revenue Earning Equipment (Depreciation Rate Changes) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue Earning Equipment [Line Items]
Depreciation rate changes	$ 28	$ 30
U.S. Car Rental
Revenue Earning Equipment [Line Items]
Depreciation rate changes	27	30
International Car Rental
Revenue Earning Equipment [Line Items]
Depreciation rate changes	1	0
Worldwide Equipment Rental
Revenue Earning Equipment [Line Items]
Depreciation rate changes	$ 0	$ 0