Proforma Summary of Acquisition (Detail) (Avis Europe, USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Avis Europe
Acquisition [Abstract]
Net revenues	$ 7,259	$ 6,768
Net income	$ 234	$ (133)
Earnings per share - Diluted	$ 1.82	$ (1.29)

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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