Schedule Of Carrying Amounts And Estimated Fair Values (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 57		$ 37
Estimate of Fair Value, Fair Value Disclosure
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	58		37
Long-term debt, excluding convertible debt	2,903	[1]	2,842	[1]
Convertible debt	171	[1]	354	[1]
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding	5,391	[1]	4,643	[1]
Vehicle-backed debt	1,613	[1]	1,001	[1]
Interest rate swaps and interest rate contracts	4	[2]	4	[2]
Carrying (Reported) Amount, Fair Value Disclosure
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	57		37
Long-term debt, excluding convertible debt	2,720	[1]	2,823	[1]
Convertible debt	128	[1]	345	[1]
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding	5,203	[1]	4,574	[1]
Vehicle-backed debt	1,599	[1]	986	[1]
Interest rate swaps and interest rate contracts	$ 4	[2]	$ 4	[2]

[1] The fair value measurements are based on significant observable inputs (Level 2).

[2] Derivatives in liability position.