Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Statements Of Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Vehicle rental	$ 1,286	$ 1,328
Other	553	553
Net revenues	1,839	1,881
Expenses
Operating	1,049	1,040
Vehicle depreciation and lease charges, net	504	463
Selling, general and administrative	262	269
Vehicle interest, net	64	65
Non-vehicle related depreciation and amortization	63	61
Interest expense	49	50
Intercompany interest expense (income)	0	0
Early extinguishment of debt	3
Restructuring expense	7	15
Transaction-related costs, net	3	4
Total expenses	2,004	1,967
Income before income taxes	(165)	(86)
Provision for (benefit from) income taxes	58	35
Equity in earnings (loss) of subsidiaries	0	0
Net income (loss)	(107)	(51)
Comprehensive income (loss)	79	(19)
Parent Company [Member]
Revenues
Vehicle rental	0	0
Other	0	0
Net revenues	0	0
Expenses
Operating	1	1
Vehicle depreciation and lease charges, net	0	0
Selling, general and administrative	10	10
Vehicle interest, net	0	0
Non-vehicle related depreciation and amortization	0	0
Interest expense	0	0
Intercompany interest expense (income)	(3)	(3)
Early extinguishment of debt	0
Restructuring expense	0	0
Transaction-related costs, net	0	0
Total expenses	8	8
Income before income taxes	(8)	(8)
Provision for (benefit from) income taxes	2	3
Equity in earnings (loss) of subsidiaries	(101)	(46)
Net income (loss)	(107)	(51)
Comprehensive income (loss)	79	(19)
Subsidiary Issuers [Member]
Revenues
Vehicle rental	0	0
Other	0	0
Net revenues	0	0
Expenses
Operating	4	10
Vehicle depreciation and lease charges, net	0	0
Selling, general and administrative	2	5
Vehicle interest, net	0	0
Non-vehicle related depreciation and amortization	0	1
Interest expense	46	39
Intercompany interest expense (income)	1	(3)
Early extinguishment of debt	3
Restructuring expense	0	0
Transaction-related costs, net	0	1
Total expenses	56	53
Income before income taxes	(56)	(53)
Provision for (benefit from) income taxes	23	21
Equity in earnings (loss) of subsidiaries	(68)	(14)
Net income (loss)	(101)	(46)
Comprehensive income (loss)	74	(24)
Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	886	929
Other	267	271
Net revenues	1,153	1,200
Expenses
Operating	640	628
Vehicle depreciation and lease charges, net	546	461
Selling, general and administrative	153	149
Vehicle interest, net	45	45
Non-vehicle related depreciation and amortization	40	37
Interest expense	1	1
Intercompany interest expense (income)	6	6
Early extinguishment of debt	0
Restructuring expense	6	6
Transaction-related costs, net	0	0
Total expenses	1,437	1,333
Income before income taxes	(284)	(133)
Provision for (benefit from) income taxes	39	5
Equity in earnings (loss) of subsidiaries	177	114
Net income (loss)	(68)	(14)
Comprehensive income (loss)	41	(58)
Non-Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	400	399
Other	871	794
Net revenues	1,271	1,193
Expenses
Operating	404	401
Vehicle depreciation and lease charges, net	493	467
Selling, general and administrative	97	105
Vehicle interest, net	69	67
Non-vehicle related depreciation and amortization	23	23
Interest expense	2	10
Intercompany interest expense (income)	(4)	0
Early extinguishment of debt	0
Restructuring expense	1	9
Transaction-related costs, net	3	3
Total expenses	1,088	1,085
Income before income taxes	183	108
Provision for (benefit from) income taxes	(6)	6
Equity in earnings (loss) of subsidiaries	0	0
Net income (loss)	177	114
Comprehensive income (loss)	(203)	(185)
Eliminations [Member]
Revenues
Vehicle rental	0	0
Other	(585)	(512)
Net revenues	(585)	(512)
Expenses
Operating	0	0
Vehicle depreciation and lease charges, net	(535)	(465)
Selling, general and administrative	0	0
Vehicle interest, net	(50)	(47)
Non-vehicle related depreciation and amortization	0	0
Interest expense	0	0
Intercompany interest expense (income)	0	0
Early extinguishment of debt	0
Restructuring expense	0	0
Transaction-related costs, net	0	0
Total expenses	(585)	(512)
Income before income taxes	0	0
Provision for (benefit from) income taxes	0	0
Equity in earnings (loss) of subsidiaries	(8)	(54)
Net income (loss)	(8)	(54)
Comprehensive income (loss)	$ 88	$ 267