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Restructuring (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Restructuring (Details) - USD ($) $ in Millions	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restructuring details
Restructuring charges	$ 19	$ 30	$ 26	$ 45
Restructuring reserve
Balance as of January 1, 2015			43
Charges incurred			26
Cash payments			(25)
Other non-cash changes			(4)
Balance as of June 30, 2015	40		40
U.S. Car Rental
Restructuring details
Restructuring charges	14	13	16	18
International Car Rental
Restructuring details
Restructuring charges	5	11	7	15
Worldwide Equipment Rental
Restructuring details
Restructuring charges	0	0	1	3
Corporate
Restructuring details
Restructuring charges	0	6	2	9
Direct operating
Restructuring details
Restructuring charges	14	20	16	26
Selling, general and administrative
Restructuring details
Restructuring charges	5	10	10	19
Termination benefits
Restructuring details
Restructuring charges	6	9	12	18
Restructuring reserve
Balance as of January 1, 2015			21
Charges incurred			12
Cash payments			(15)
Other non-cash changes			(1)
Balance as of June 30, 2015	17		17
Asset write-downs
Restructuring details
Restructuring charges	0	10	1	10
Facility closure and lease obligation costs
Restructuring details
Restructuring charges	14	11	15	17
Other non-cash charges
Restructuring details
Restructuring charges	(1)	$ 0	(2)	$ 0
Other
Restructuring reserve
Balance as of January 1, 2015			22
Charges incurred			14
Cash payments			(10)
Other non-cash changes			(3)
Balance as of June 30, 2015	$ 23		$ 23