Changes in Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Beginning Balance	$ 186	$ 40	$ 603
Additions based on tax positions related to the current year	4
Additions for tax positions for prior years	5	143	9
Additions associated with the acquisition of Avis Europe		34
Reductions for tax positions for prior years	(140)	(3)	(443)
Settlements	(1)		(129)
Statute of limitations		(28)
Ending Balance	$ 54	$ 186	$ 40

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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Gross amount of increases in unrecognized tax benefits resulting from acquisitions.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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