Acquisitions (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Acquisition Cost	5
License Agreements	4
Acquisition Cost, associated vehicles	1
Licensee And Sub-Licensee Agreements [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Acquisition, other intangibles	188
Customer Relationships [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Other intangibles, useful life, in years	12 years
Avis Europe [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Date of acquisition	Oct. 03, 2011
Acquisition purchase price	976
Repaid assumed indebtedness	649
Avis Europe [Member] | Licensee And Sub-Licensee Agreements [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Other intangibles, useful life, in years	20 years
Avis Europe [Member] | Customer Relationships [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Acquisition, other intangibles	67