Summary of Segments Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Net revenues	$ 7,357		$ 5,900		$ 5,185
Vehicle depreciation and lease charges, net	1,471		1,223		1,287
Vehicle interest, net	297		286		304
Adjusted EBITDA	802	[1]	605	[1]	398	[1]
Non-vehicle depreciation and amortization	125		95		90
Segment assets exclusive of assets under vehicle programs	5,119		3,848		3,462
Assets under vehicle programs	10,099		9,090		6,865
Capital expenditures (excluding vehicles)	132		65		61
North America
Segment Reporting Information [Line Items]
Net revenues	4,640		4,495		4,260
Vehicle depreciation and lease charges, net	943		969		1,124
Vehicle interest, net	246		263		288
Adjusted EBITDA	556		442		266
Non-vehicle depreciation and amortization	78		80		85
Segment assets exclusive of assets under vehicle programs	3,065		2,112		2,515
Assets under vehicle programs	7,394		6,674		5,925
Capital expenditures (excluding vehicles)	72		54		57
International
Segment Reporting Information [Line Items]
Net revenues	2,342		1,028		555
Vehicle depreciation and lease charges, net	483		209		103
Vehicle interest, net	38		11		1
Adjusted EBITDA	234		127		114
Non-vehicle depreciation and amortization	46		14		3
Segment assets exclusive of assets under vehicle programs	1,740		1,464		321
Assets under vehicle programs	2,300		2,109		580
Capital expenditures (excluding vehicles)	60		10		4
Truck Rental
Segment Reporting Information [Line Items]
Net revenues	374		376		367
Vehicle depreciation and lease charges, net	45		45		60
Vehicle interest, net	13		12		15
Adjusted EBITDA	33		49		34
Non-vehicle depreciation and amortization	1		1		2
Segment assets exclusive of assets under vehicle programs	90		88		99
Assets under vehicle programs	405		307		360
Capital expenditures (excluding vehicles)			1
Corporate and Other
Segment Reporting Information [Line Items]
Net revenues	1	[2]	1	[2]	3	[2]
Adjusted EBITDA	(21)	[2]	(13)	[2]	(16)	[2]
Segment assets exclusive of assets under vehicle programs	$ 224	[2]	$ 184	[2]	$ 527	[2]

[1] Adjusted EBITDA includes restructuring costs of $38 million, $5 million and $11 million for the years ended December 31, 2012, 2011 and 2010, respectively.

[2] Includes the results of operations of the Company's investments, unallocated corporate overhead and the elimination of transactions between segments.