Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Statements Of Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Vehicle rental	$ 1,328	$ 1,319
Other	553	531
Net revenues	1,881	1,850
Expenses
Operating	1,040	985
Vehicle depreciation and lease charges, net	463	432
Selling, general and administrative	269	248
Vehicle interest, net	65	68
Non-vehicle related depreciation and amortization	61	49
Interest expense related to corporate debt, net	50	52
Intercompany Interest Expense Income	0	0
Transaction-related costs, net	4	31
Total expenses	1,967	1,866
Interest expense related to corporate debt, net
Income before income taxes	(86)	(16)
Provision for (benefit from) income taxes	35	7
Equity in earnings (loss) of subsidiaries	0	0
Net loss	(51)	(9)
Comprehensive income (loss)	(19)	103
Restructuring Charges	15	1
Parent Company [Member]
Revenues
Vehicle rental	0	0
Other	0	0
Net revenues	0	0
Expenses
Operating	1	0
Vehicle depreciation and lease charges, net	0	0
Selling, general and administrative	10	8
Vehicle interest, net	0	0
Non-vehicle related depreciation and amortization	0	0
Interest expense related to corporate debt, net	0	0
Intercompany Interest Expense Income	(3)	(3)
Transaction-related costs, net	0	0
Total expenses	8	5
Interest expense related to corporate debt, net
Income before income taxes	(8)	(5)
Provision for (benefit from) income taxes	3	2
Equity in earnings (loss) of subsidiaries	(46)	(6)
Net loss	(51)	(9)
Comprehensive income (loss)	(19)	103
Restructuring Charges	0	0
Subsidiary Issuers [Member]
Revenues
Vehicle rental	0	0
Other	0	0
Net revenues	0	0
Expenses
Operating	10	4
Vehicle depreciation and lease charges, net	0	0
Selling, general and administrative	5	3
Vehicle interest, net	0	0
Non-vehicle related depreciation and amortization	1	0
Interest expense related to corporate debt, net	39	40
Intercompany Interest Expense Income	(3)	(2)
Transaction-related costs, net	1	6
Total expenses	53	51
Interest expense related to corporate debt, net
Income before income taxes	(53)	(51)
Provision for (benefit from) income taxes	21	20
Equity in earnings (loss) of subsidiaries	(14)	25
Net loss	(46)	(6)
Comprehensive income (loss)	(24)	100
Restructuring Charges	0	0
Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	929	942
Other	271	267
Net revenues	1,200	1,209
Expenses
Operating	628	608
Vehicle depreciation and lease charges, net	461	436
Selling, general and administrative	149	140
Vehicle interest, net	45	49
Non-vehicle related depreciation and amortization	37	33
Interest expense related to corporate debt, net	1	1
Intercompany Interest Expense Income	6	0
Transaction-related costs, net	0	1
Total expenses	1,333	1,269
Interest expense related to corporate debt, net
Income before income taxes	(133)	(60)
Provision for (benefit from) income taxes	5	(8)
Equity in earnings (loss) of subsidiaries	114	93
Net loss	(14)	25
Comprehensive income (loss)	(58)	67
Restructuring Charges	6	1
Non-Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	399	377
Other	794	753
Net revenues	1,193	1,130
Expenses
Operating	401	373
Vehicle depreciation and lease charges, net	467	431
Selling, general and administrative	105	97
Vehicle interest, net	67	73
Non-vehicle related depreciation and amortization	23	16
Interest expense related to corporate debt, net	10	11
Intercompany Interest Expense Income	0	5
Transaction-related costs, net	3	24
Total expenses	1,085	1,030
Interest expense related to corporate debt, net
Income before income taxes	108	100
Provision for (benefit from) income taxes	6	(7)
Equity in earnings (loss) of subsidiaries	0	0
Net loss	114	93
Comprehensive income (loss)	(185)	(1)
Restructuring Charges	9	0
Eliminations [Member]
Revenues
Vehicle rental	0	0
Other	(512)	(489)
Net revenues	(512)	(489)
Expenses
Operating	0	0
Vehicle depreciation and lease charges, net	(465)	(435)
Selling, general and administrative	0	0
Vehicle interest, net	(47)	(54)
Non-vehicle related depreciation and amortization	0	0
Interest expense related to corporate debt, net	0	0
Intercompany Interest Expense Income	0	0
Transaction-related costs, net	0	0
Total expenses	(512)	(489)
Interest expense related to corporate debt, net
Income before income taxes	0	0
Provision for (benefit from) income taxes	0	0
Equity in earnings (loss) of subsidiaries	(54)	(112)
Net loss	(54)	(112)
Comprehensive income (loss)	267	(166)
Restructuring Charges	$ 0	$ 0