Components Of Vehicle Depreciation And Lease Charges (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Vehicle Depreciation and Lease Charges, Net [Line Items]
Depreciation expense	$ 1,438	$ 1,395	$ 1,277
Lease charges	130	62	34
Gain on sale of vehicles, net	(97)	(234)	(24)
Vehicle depreciation and lease charges, net	$ 1,471	$ 1,223	$ 1,287

Gain on sales of vehicles, net including the cost of the vehicle disposition, for vehicles used in rental activities.

No definition available.

Name:	car_GainLossOnSaleOfVehicles
Namespace Prefix:	car_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration