Summary of Preliminary Allocation of Purchase Price (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012 Avis Europe	Dec. 31, 2011 Avis Europe
Business Acquisition [Line Items]
Cash		$ 136
Receivables		245
Other current assets		213
Property and equipment		91
Deferred income taxes		27
Other intangibles		254
Other non-current assets		31
Vehicles		1,706
Receivables from vehicle manufacturers and other		282
Total identifiable assets acquired		2,985
Accounts payable and other current liabilities		(552)
Debt		(763)
Other non-current liabilities		(322)
Liabilities under vehicles program - debt		(779)
Total liabilities assumed		(2,416)
Net assets acquired		569
Goodwill		290
Non-cash charge related to the reacquired unfavorable license rights	117	117
Total		$ 976	$ 976