Segment Information (Summary Of Segments Information) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Restructuring expense	$ 10	$ 7
Revenues	1,691	1,623
Adjusted EBITDA	83	112
Non-vehicle related depreciation and amortization	34	32
Interest expense	58	73
Early extinguishment of debt	40	27
Loss before income taxes	(57)	(26)
Transaction-related costs	8	6
North America [Member]
Segment Reporting Information [Line Items]
Restructuring expense	3
Revenues	1,100	1,038
Adjusted EBITDA	90	93
International [Member]
Segment Reporting Information [Line Items]
Restructuring expense	3
Revenues	515	510
Adjusted EBITDA	14	22
Truck Rental [Member]
Segment Reporting Information [Line Items]
Restructuring expense	4
Revenues	76	75
Adjusted EBITDA	(9)	1
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Adjusted EBITDA	$ (12)	$ (4)