Segment Information (Narrative) (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		Dec. 31, 2013
Segment Reporting Information [Line Items]
Segment Reporting, Change in Measurement Method			$ 13				$ 15
Sales Revenue, Services, Net	2,194		2,002		4,056		3,693
Adjusted EBITDA	213	[1]	179	[1]	330	[1]	272	[1]
Non Vehicle Related Depreciation And Amortization	45		37		86		71
Interest expense	55		55		111		114
Early extinguishment of debt	56		91		56		131
Transaction-related costs	8		19		16		26
Restructuring expense	1		15	[2]	8		25	[2]
Assets under vehicle programs	14,047				14,047				10,452
Non current deferred tax assets	1,190				1,190				1,299
Loss before income taxes	48		(38)		53		(95)
North America
Segment Reporting Information [Line Items]
Segment Reporting, Change in Measurement Method							3
Sales Revenue, Services, Net	1,427		1,279		2,663		2,377
Adjusted EBITDA	157		115		271		208
Restructuring expense					2
Assets under vehicle programs	10,800				10,800				7,900
International
Segment Reporting Information [Line Items]
Segment Reporting, Change in Measurement Method			6				9
Sales Revenue, Services, Net	667		621		1,218		1,138
Adjusted EBITDA	57		58		74		75
Restructuring expense					6
Assets under vehicle programs	2,900				2,900				2,200
Truck Rental [Member]
Segment Reporting Information [Line Items]
Segment Reporting, Change in Measurement Method			9				13
Sales Revenue, Services, Net	100		102		175		178
Adjusted EBITDA	13		17		11		12
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	0	[2]	0	[2]	0	[2]	0	[2]
Adjusted EBITDA	$ (14)	[2]	$ (11)	[2]	$ (26)	[2]	$ (23)	[2]

[1] (b) Amounts reflect a revision to the definition of Adjusted EBITDA to exclude restructuring expense, which resulted in an increase in Adjusted EBITDA in International and Truck Rental of $6 million and $9 million, respectively, and a change in the Company’s reportable segments, which resulted in an increase in North America Adjusted EBITDA and a decrease in International Adjusted EBITDA of $1 million in the three months ended June 30, 2013.

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