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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Vehicle rental	$ 1,573	$ 1,533	$ 2,901	$ 2,852
Other	670	640	1,223	1,171
Net revenues	2,243	2,173	4,124	4,023
Expenses
Operating	1,122	1,092	2,162	2,077
Vehicle depreciation and lease charges, net	532	498	995	930
Selling, general and administrative	312	281	581	529
Vehicle interest, net	73	75	138	143
Non-vehicle related depreciation and amortization	65	56	126	105
Interest expense	56	45	106	97
Intercompany interest expense (income)	0	0	0	0
Early extinguishment of debt	10	23	10	23
Restructuring expense	5	3	20	4
Transaction-related costs, net	5	18	9	49
Total expenses	2,180	2,091	4,147	3,957
Income before income taxes	63	82	(23)	66
Provision for (benefit from) income taxes	(27)	61	8	68
Equity in earnings (loss) of subsidiaries	0	0	0	0
Net income (loss)	36	143	(15)	134
Comprehensive income (loss)	(40)	(151)	(59)	(48)
Parent Company [Member]
Revenues
Vehicle rental	0	0	0	0
Other	0	0	0	0
Net revenues	0	0	0	0
Expenses
Operating	1	1	2	1
Vehicle depreciation and lease charges, net	0	0	0	0
Selling, general and administrative	9	9	19	17
Vehicle interest, net	0	0	0	0
Non-vehicle related depreciation and amortization	0	0	0	0
Interest expense	0	0	0	0
Intercompany interest expense (income)	(3)	(3)	(6)	(6)
Early extinguishment of debt	0	0	0	0
Restructuring expense	0	0	0	0
Transaction-related costs, net	0	0	0	0
Total expenses	7	7	15	12
Income before income taxes	(7)	(7)	(15)	(12)
Provision for (benefit from) income taxes	3	3	6	5
Equity in earnings (loss) of subsidiaries	40	147	(6)	141
Net income (loss)	36	143	(15)	134
Comprehensive income (loss)	(40)	(151)	(59)	(48)
Subsidiary Issuers [Member]
Revenues
Vehicle rental	0	0	0	0
Other	0	0	0	0
Net revenues	0	0	0	0
Expenses
Operating	1	5	11	9
Vehicle depreciation and lease charges, net	0	0	0	0
Selling, general and administrative	5	3	10	6
Vehicle interest, net	0	0	0	0
Non-vehicle related depreciation and amortization	0	1	1	1
Interest expense	42	42	81	82
Intercompany interest expense (income)	(2)	(3)	(5)	(5)
Early extinguishment of debt	10	23	10	23
Restructuring expense	0	0	0	0
Transaction-related costs, net	0	12	1	18
Total expenses	56	83	109	134
Income before income taxes	(56)	(83)	(109)	(134)
Provision for (benefit from) income taxes	22	127	43	147
Equity in earnings (loss) of subsidiaries	74	103	60	128
Net income (loss)	40	147	(6)	141
Comprehensive income (loss)	(44)	(155)	(68)	(55)
Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	1,084	1,055	2,013	1,997
Other	316	307	587	574
Net revenues	1,400	1,362	2,600	2,571
Expenses
Operating	666	654	1,294	1,262
Vehicle depreciation and lease charges, net	528	476	989	912
Selling, general and administrative	170	162	319	302
Vehicle interest, net	49	52	94	101
Non-vehicle related depreciation and amortization	40	33	77	66
Interest expense	1	(8)	2	(7)
Intercompany interest expense (income)	5	6	11	6
Early extinguishment of debt	0	0	0	0
Restructuring expense	1	0	7	1
Transaction-related costs, net	1	0	1	1
Total expenses	1,461	1,375	2,794	2,644
Income before income taxes	(61)	(13)	(194)	(73)
Provision for (benefit from) income taxes	(37)	(53)	(32)	(61)
Equity in earnings (loss) of subsidiaries	172	169	286	262
Net income (loss)	74	103	60	128
Comprehensive income (loss)	(83)	(111)	(141)	(44)
Non-Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	489	478	888	855
Other	931	866	1,725	1,619
Net revenues	1,420	1,344	2,613	2,474
Expenses
Operating	454	432	855	805
Vehicle depreciation and lease charges, net	529	500	996	931
Selling, general and administrative	128	107	233	204
Vehicle interest, net	76	78	143	151
Non-vehicle related depreciation and amortization	25	22	48	38
Interest expense	13	11	23	22
Intercompany interest expense (income)	0	0	0	5
Early extinguishment of debt	0	0	0	0
Restructuring expense	4	3	13	3
Transaction-related costs, net	4	6	7	30
Total expenses	1,233	1,159	2,318	2,189
Income before income taxes	187	185	295	285
Provision for (benefit from) income taxes	(15)	(16)	(9)	(23)
Equity in earnings (loss) of subsidiaries	0	0	0	0
Net income (loss)	172	169	286	262
Comprehensive income (loss)	(180)	(177)	(365)	(178)
Eliminations [Member]
Revenues
Vehicle rental	0	0	0	0
Other	(577)	(533)	(1,089)	(1,022)
Net revenues	(577)	(533)	(1,089)	(1,022)
Expenses
Operating	0	0	0	0
Vehicle depreciation and lease charges, net	(525)	(478)	(990)	(913)
Selling, general and administrative	0	0	0	0
Vehicle interest, net	(52)	(55)	(99)	(109)
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 extinguishment of debt	0	0	0	0
Restructuring expense	0	0	0	0
Transaction-related costs, net	0	0	0	0
Total expenses	(577)	(533)	(1,089)	(1,022)
Income before income taxes	0	0	0	0
Provision for (benefit from) income taxes	0	0	0	0
Equity in earnings (loss) of subsidiaries	(286)	(419)	(340)	(531)
Net income (loss)	(286)	(419)	(340)	(531)
Comprehensive income (loss)	$ 307	$ 443	$ 574	$ 277