Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Statements Of Comprehensive Income) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Revenues
Vehicle rental	$ 1,553	$ 1,438		$ 2,882	$ 2,654
Other	641	564		1,174	1,039
Net revenues	2,194	2,002		4,056	3,693
Expenses
Operating	1,105	1,007		2,105	1,937
Vehicle depreciation and lease charges, net	517	476		950	863
Selling, general and administrative	287	274		535	498
Vehicle interest, net	72	66		136	123
Non-vehicle related depreciation and amortization	45	37		86	71
Interest expense	55	55		111	114
Intercompany Interest Expense Income	0	0		0	0
Early extinguishment of debt	56	91		56	131
Transaction-related costs	8	19		16	26
Total expenses	2,146	2,040		4,003	3,788
Interest expense related to corporate debt, net:
Income (loss) before income taxes	48	(38)		53	(95)
Provision for (benefit from) income taxes	(22)	10		(23)	21
Equity in earnings (loss) of subsidiaries	0	0		0	0
Net income (loss)	26	(28)		30	(74)
Comprehensive income (loss)	(31)	65		(38)	134
Restructuring Charges	1	15	[1]	8	25	[1]
Parent Company [Member]
Revenues
Vehicle rental	0	0		0	0
Other	0	0		0	0
Net revenues	0	0		0	0
Expenses
Operating	2	2		2	3
Vehicle depreciation and lease charges, net	0	0		0	0
Selling, general and administrative	6	8		13	17
Vehicle interest, net	0	0		0	0
Non-vehicle related depreciation and amortization	0	0		0	0
Interest expense	0	1		1	2
Intercompany Interest Expense Income	(3)	(3)		(6)	(6)
Early extinguishment of debt	0	2		0	41
Transaction-related costs	0	1		0	1
Total expenses	5	11		10	58
Interest expense related to corporate debt, net:
Income (loss) before income taxes	(5)	(11)		(10)	(58)
Provision for (benefit from) income taxes	1	3		3	7
Equity in earnings (loss) of subsidiaries	30	(20)		37	(23)
Net income (loss)	26	(28)		30	(74)
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	4	2		8	3
Vehicle depreciation and lease charges, net	0	0		0	0
Selling, general and administrative	7	1		11	2
Vehicle interest, net	0	0		0	0
Non-vehicle related depreciation and amortization	1	0		1	1
Interest expense	41	52		88	106
Intercompany Interest Expense Income	(2)	(6)		(5)	(17)
Early extinguishment of debt	56	89		56	90
Transaction-related costs	2	9		4	13
Total expenses	109	147		163	198
Interest expense related to corporate debt, net:
Income (loss) before income taxes	(109)	(147)		(163)	(198)
Provision for (benefit from) income taxes	43	55		64	75
Equity in earnings (loss) of subsidiaries	96	72		136	100
Net income (loss)	30	(20)		37	(23)
Comprehensive income (loss)	(33)	56		(44)	82
Restructuring Charges	0	0		0	0
Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	1,049	972		1,965	1,809
Other	309	288		576	535
Net revenues	1,358	1,260		2,541	2,344
Expenses
Operating	660	613		1,264	1,171
Vehicle depreciation and lease charges, net	505	327		946	587
Selling, general and administrative	157	165		297	296
Vehicle interest, net	51	46		96	88
Non-vehicle related depreciation and amortization	28	25		55	45
Interest expense	2	0		2	0
Intercompany Interest Expense Income	0	1		1	4
Early extinguishment of debt	0	0		0	0
Transaction-related costs	(4)	1		(1)	1
Total expenses	1,399	1,187		2,662	2,208
Interest expense related to corporate debt, net:
Income (loss) before income taxes	(41)	73		(121)	136
Provision for (benefit from) income taxes	(52)	(34)		(70)	(48)
Equity in earnings (loss) of subsidiaries	189	33		327	12
Net income (loss)	96	72		136	100
Comprehensive income (loss)	(101)	(39)		(144)	(41)
Restructuring Charges	0	9		2	16
Non-Guarantor Subsidiaries [Member]
Revenues
Vehicle rental	504	466		917	845
Other	891	643		1,646	1,170
Net revenues	1,395	1,109		2,563	2,015
Expenses
Operating	439	390		831	760
Vehicle depreciation and lease charges, net	516	323		948	566
Selling, general and administrative	117	100		214	183
Vehicle interest, net	76	63		144	121
Non-vehicle related depreciation and amortization	16	12		30	25
Interest expense	12	2		20	6
Intercompany Interest Expense Income	5	8		10	19
Early extinguishment of debt	0	0		0	0
Transaction-related costs	10	8		13	11
Total expenses	1,192	912		2,216	1,700
Interest expense related to corporate debt, net:
Income (loss) before income taxes	203	197		347	315
Provision for (benefit from) income taxes	(14)	(14)		(20)	(13)
Equity in earnings (loss) of subsidiaries	0	0		0	0
Net income (loss)	189	183		327	302
Comprehensive income (loss)	(194)	(151)		(335)	(245)
Restructuring Charges	1	6		6	9
Eliminations [Member]
Revenues
Vehicle rental	0	0		0	0
Other	(559)	(367)		(1,048)	(666)
Net revenues	(559)	(367)		(1,048)	(666)
Expenses
Operating	0	0		0	0
Vehicle depreciation and lease charges, net	(504)	(174)		(944)	(290)
Selling, general and administrative	0	0		0	0
Vehicle interest, net	(55)	(43)		(104)	(86)
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
Transaction-related costs	0	0		0	0
Total expenses	(559)	(217)		(1,048)	(376)
Interest expense related to corporate debt, net:
Income (loss) before income taxes	0	(150)		0	(290)
Provision for (benefit from) income taxes	0	0		0	0
Equity in earnings (loss) of subsidiaries	(315)	(85)		(500)	(89)
Net income (loss)	(315)	(235)		(500)	(379)
Comprehensive income (loss)	328	134		523	204
Restructuring Charges	$ 0	$ 0		$ 0	$ 0

[1] (c) Includes unallocated corporate overhead which is not attributable to a particular segment.