Summary of Segments Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net revenues	$ 8,502	$ 8,485	$ 7,937
Vehicle depreciation and lease charges, net	1,933	1,996	1,811
Vehicle interest, net	289	282	264
Adjusted EBITDA	903	876	769
Non-vehicle depreciation and amortization	218	180	152
Assets exclusive of assets under vehicle programs	5,918	5,784	5,698
Assets under vehicle programs	11,716	11,058	10,452
Capital expenditures (excluding vehicles)	199	182	152
Americas
Segment Reporting Information [Line Items]
Net revenues	6,069	5,961	5,480
Vehicle depreciation and lease charges, net	1,478	1,492	1,315
Vehicle interest, net	234	234	216
Adjusted EBITDA	682	656	560
Non-vehicle depreciation and amortization	143	122	103
Assets exclusive of assets under vehicle programs	3,940	3,946	3,797
Assets under vehicle programs	9,440	9,162	8,357
Capital expenditures (excluding vehicles)	131	113	99
International
Segment Reporting Information [Line Items]
Net revenues	2,433	2,524	2,457
Vehicle depreciation and lease charges, net	455	504	496
Vehicle interest, net	55	48	48
Adjusted EBITDA	277	280	256
Non-vehicle depreciation and amortization	75	58	49
Assets exclusive of assets under vehicle programs	1,901	1,730	1,749
Assets under vehicle programs	2,276	1,896	2,095
Capital expenditures (excluding vehicles)	68	69	53
Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	(56)	(60)	(47)
Assets exclusive of assets under vehicle programs	$ 77	$ 108	$ 152