Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Statements Of Comprehensive Income) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues
Vehicle rental	$ 1,319	$ 1,329
Other	531	533
Net revenues	1,850	1,862
Expenses
Operating	985	1,000
Vehicle depreciation and lease charges, net	432	433
Selling, general and administrative	248	248
Vehicle interest, net	68	64
Non-vehicle related depreciation and amortization	49	41
Interest expense	52	56
Intercompany Interest Expense Income	0	0
Transaction-related costs	31	8
Total expenses	1,866	1,857
Interest expense related to corporate debt, net
Income before income taxes	(16)	5
Provision for (benefit from) income taxes	7	(1)
Equity in earnings (loss) of subsidiaries	0	0
Net income (loss)	(9)	4
Comprehensive income (loss)	103	(7)
Restructuring Charges	1	7
Parent Company [Member]
Revenues
Vehicle rental	0	0
Other	0	0
Net revenues	0	0
Expenses
Operating	0	0
Vehicle depreciation and lease charges, net	0	0
Selling, general and administrative	8	7
Vehicle interest, net	0	0
Non-vehicle related depreciation and amortization	0	0
Interest expense	0	1
Intercompany Interest Expense Income	(3)	(3)
Transaction-related costs	0	0
Total expenses	5	5
Interest expense related to corporate debt, net
Income before income taxes	(5)	(5)
Provision for (benefit from) income taxes	2	2
Equity in earnings (loss) of subsidiaries	(6)	7
Net income (loss)	(9)	4
Comprehensive income (loss)	103	(7)
Restructuring Charges	0	0
Subsidiary Issuers [Member]
Revenues
Vehicle rental	0	0
Other	0	0
Net revenues	0	0
Expenses
Operating	4	4
Vehicle depreciation and lease charges, net	0	0
Selling, general and administrative	3	4
Vehicle interest, net	0	0
Non-vehicle related depreciation and amortization	0	0
Interest expense	40	47
Intercompany Interest Expense Income	(2)	(3)
Transaction-related costs	6	2
Total expenses	51	54
Interest expense related to corporate debt, net
Income before income taxes	(51)	(54)
Provision for (benefit from) income taxes	20	21
Equity in earnings (loss) of subsidiaries	25	40
Net income (loss)	(6)	7
Comprehensive income (loss)	100	(11)
Restructuring Charges	0	0
Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	942	916
Other	267	267
Net revenues	1,209	1,183
Expenses
Operating	608	604
Vehicle depreciation and lease charges, net	436	441
Selling, general and administrative	140	140
Vehicle interest, net	49	45
Non-vehicle related depreciation and amortization	33	27
Interest expense	1	0
Intercompany Interest Expense Income	0	1
Transaction-related costs	1	3
Total expenses	1,269	1,263
Interest expense related to corporate debt, net
Income before income taxes	(60)	(80)
Provision for (benefit from) income taxes	(8)	(18)
Equity in earnings (loss) of subsidiaries	93	138
Net income (loss)	25	40
Comprehensive income (loss)	67	(43)
Restructuring Charges	1	2
Non-Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	377	413
Other	753	755
Net revenues	1,130	1,168
Expenses
Operating	373	392
Vehicle depreciation and lease charges, net	431	432
Selling, general and administrative	97	97
Vehicle interest, net	73	68
Non-vehicle related depreciation and amortization	16	14
Interest expense	11	8
Intercompany Interest Expense Income	5	5
Transaction-related costs	24	3
Total expenses	1,030	1,024
Interest expense related to corporate debt, net
Income before income taxes	100	144
Provision for (benefit from) income taxes	(7)	(6)
Equity in earnings (loss) of subsidiaries	0	0
Net income (loss)	93	138
Comprehensive income (loss)	(1)	(141)
Restructuring Charges	0	5
Eliminations [Member]
Revenues
Vehicle rental	0	0
Other	(489)	(489)
Net revenues	(489)	(489)
Expenses
Operating	0	0
Vehicle depreciation and lease charges, net	(435)	(440)
Selling, general and administrative	0	0
Vehicle interest, net	(54)	(49)
Non-vehicle related depreciation and amortization	0	0
Interest expense	0	0
Intercompany Interest Expense Income	0	0
Transaction-related costs	0	0
Total expenses	(489)	(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	(112)	(185)
Net income (loss)	(112)	(185)
Comprehensive income (loss)	(166)	195
Restructuring Charges	$ 0	$ 0