Revenue Earning Equipment (Depreciation Rates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net increase (decrease) in depreciation expenses	$ 164	$ (39)	$ (129)
U.S. car rental
Segment Reporting Information [Line Items]
Net increase (decrease) in depreciation expenses	167	(44)	(139)
International car rental
Segment Reporting Information [Line Items]
Net increase (decrease) in depreciation expenses	(3)	5	9
Worldwide equipment rental
Segment Reporting Information [Line Items]
Net increase (decrease) in depreciation expenses	$ 0	$ 0	$ 1