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Restructuring (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Restructuring (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring details
Restructuring charges	$ 6	$ 23	$ 32	$ 68
Restructuring reserve
Balance as of January 1, 2015			43
Charges incurred			32
Cash payments			(24)
Other non-cash changes			(16)
Balance as of September 30, 2015	35		35
U.S. Car Rental
Restructuring details
Restructuring charges	2	4	18	22
International Car Rental
Restructuring details
Restructuring charges	4	1	11	16
Worldwide Equipment Rental
Restructuring details
Restructuring charges	2	1	3	4
Corporate
Restructuring details
Restructuring charges	(2)	17	0	26
Direct operating
Restructuring details
Restructuring charges	1	5	17	31
Selling, general and administrative
Restructuring details
Restructuring charges	5	18	15	37
Termination benefits
Restructuring details
Restructuring charges	6	3	18	21
Restructuring reserve
Balance as of January 1, 2015			21
Charges incurred			14
Cash payments			(12)
Other non-cash changes			(9)
Balance as of September 30, 2015	14		14
Asset write-downs
Restructuring details
Restructuring charges	1	13	2	23
Facility closure and lease obligation costs
Restructuring details
Restructuring charges	1	4	16	13
Other non-cash charges
Restructuring details
Restructuring charges	(2)	$ 3	(4)	$ 11
Other
Restructuring reserve
Balance as of January 1, 2015			22
Charges incurred			18
Cash payments			(12)
Other non-cash changes			(7)
Balance as of September 30, 2015	$ 21		$ 21