Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Statements Of Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Vehicle rental	$ 1,533	$ 1,553	$ 2,852	$ 2,882
Other	640	641	1,171	1,174
Net revenues	2,173	2,194	4,023	4,056
Expenses
Operating	1,092	1,105	2,077	2,105
Vehicle depreciation and lease charges, net	498	517	930	950
Selling, general and administrative	281	287	529	535
Vehicle interest, net	75	72	143	136
Non-vehicle related depreciation and amortization	56	45	105	86
Interest expense	45	55	97	111
Intercompany Interest Expense Income	0	0	0	0
Early Debt Extinguishment	23	56	23	56
Transaction-related costs	18	8	49	16
Total expenses	2,091	2,146	3,957	4,003
Interest expense related to corporate debt, net:
Income before income taxes	82	48	66	53
Provision for (benefit from) income taxes	61	(22)	68	(23)
Equity in earnings (loss) of subsidiaries	0	0	0	0
Net income	143	26	134	30
Comprehensive income (loss)	(151)	(31)	(48)	(38)
Restructuring Charges	3	1	4	8
Parent Company [Member]
Revenues
Vehicle rental	0	0	0	0
Other	0	0	0	0
Net revenues	0	0	0	0
Expenses
Operating	1	2	1	2
Vehicle depreciation and lease charges, net	0	0	0	0
Selling, general and administrative	9	6	17	13
Vehicle interest, net	0	0	0	0
Non-vehicle related depreciation and amortization	0	0	0	0
Interest expense	0	0	0	1
Intercompany Interest Expense Income	(3)	(3)	(6)	(6)
Early Debt Extinguishment	0	0	0	0
Transaction-related costs	0	0	0	0
Total expenses	7	5	12	10
Interest expense related to corporate debt, net:
Income before income taxes	(7)	(5)	(12)	(10)
Provision for (benefit from) income taxes	3	1	5	3
Equity in earnings (loss) of subsidiaries	147	30	141	37
Net income	143	26	134	30
Comprehensive income (loss)	(151)	(31)	(48)	(38)
Restructuring Charges	0	0	0	0
Subsidiary Issuers [Member]
Revenues
Vehicle rental	0	0	0	0
Other	0	0	0	0
Net revenues	0	0	0	0
Expenses
Operating	5	4	9	8
Vehicle depreciation and lease charges, net	0	0	0	0
Selling, general and administrative	3	7	6	11
Vehicle interest, net	0	0	0	0
Non-vehicle related depreciation and amortization	1	1	1	1
Interest expense	42	41	82	88
Intercompany Interest Expense Income	(3)	(2)	(5)	(5)
Early Debt Extinguishment	23	56	23	56
Transaction-related costs	12	2	18	4
Total expenses	83	109	134	163
Interest expense related to corporate debt, net:
Income before income taxes	(83)	(109)	(134)	(163)
Provision for (benefit from) income taxes	127	43	147	64
Equity in earnings (loss) of subsidiaries	103	96	128	136
Net income	147	30	141	37
Comprehensive income (loss)	(155)	(33)	(55)	(44)
Restructuring Charges	0	0	0	0
Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	1,055	1,049	1,997	1,965
Other	307	309	574	576
Net revenues	1,362	1,358	2,571	2,541
Expenses
Operating	654	660	1,262	1,264
Vehicle depreciation and lease charges, net	476	505	912	946
Selling, general and administrative	162	157	302	297
Vehicle interest, net	52	51	101	96
Non-vehicle related depreciation and amortization	33	28	66	55
Interest expense	(8)	2	(7)	2
Intercompany Interest Expense Income	6	0	6	1
Early Debt Extinguishment	0	0	0	0
Transaction-related costs	0	(4)	1	(1)
Total expenses	1,375	1,399	2,644	2,662
Interest expense related to corporate debt, net:
Income before income taxes	(13)	(41)	(73)	(121)
Provision for (benefit from) income taxes	(53)	(52)	(61)	(70)
Equity in earnings (loss) of subsidiaries	169	189	262	327
Net income	103	96	128	136
Comprehensive income (loss)	(111)	(101)	(44)	(144)
Restructuring Charges	0	0	1	2
Non-Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	478	504	855	917
Other	866	891	1,619	1,646
Net revenues	1,344	1,395	2,474	2,563
Expenses
Operating	432	439	805	831
Vehicle depreciation and lease charges, net	500	516	931	948
Selling, general and administrative	107	117	204	214
Vehicle interest, net	78	76	151	144
Non-vehicle related depreciation and amortization	22	16	38	30
Interest expense	11	12	22	20
Intercompany Interest Expense Income	0	5	5	10
Early Debt Extinguishment	0	0	0	0
Transaction-related costs	6	10	30	13
Total expenses	1,159	1,192	2,189	2,216
Interest expense related to corporate debt, net:
Income before income taxes	185	203	285	347
Provision for (benefit from) income taxes	(16)	(14)	(23)	(20)
Equity in earnings (loss) of subsidiaries	0	0	0	0
Net income	169	189	262	327
Comprehensive income (loss)	(177)	(194)	(178)	(335)
Restructuring Charges	3	1	3	6
Eliminations [Member]
Revenues
Vehicle rental	0	0	0	0
Other	(533)	(559)	(1,022)	(1,048)
Net revenues	(533)	(559)	(1,022)	(1,048)
Expenses
Operating	0	0	0	0
Vehicle depreciation and lease charges, net	(478)	(504)	(913)	(944)
Selling, general and administrative	0	0	0	0
Vehicle interest, net	(55)	(55)	(109)	(104)
Non-vehicle related depreciation and amortization	0	0	0	0
Interest expense	0	0	0	0
Intercompany Interest Expense Income	0	0	0	0
Early Debt Extinguishment	0	0	0	0
Transaction-related costs	0	0	0	0
Total expenses	(533)	(559)	(1,022)	(1,048)
Interest expense related to corporate debt, net:
Income before income taxes	0	0	0	0
Provision for (benefit from) income taxes	0	0	0	0
Equity in earnings (loss) of subsidiaries	(419)	(315)	(531)	(500)
Net income	(419)	(315)	(531)	(500)
Comprehensive income (loss)	443	328	277	523
Restructuring Charges	$ 0	$ 0	$ 0	$ 0