Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 81	$ 37
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	81	37
Long-term debt, excluding convertible debt	2,742	2,823
Convertible debt	144	345
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding (AESOP) LLC	5,813	4,574
Vehicle-backed debt	2,061	986
Interest rate swaps and interest rate contracts	1	4
Estimate Of Fair Value, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	81	37
Long-term debt, excluding convertible debt	2,919	2,842
Convertible debt	175	354
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding (AESOP) LLC	6,026	4,643
Vehicle-backed debt	2,076	1,001
Interest rate swaps and interest rate contracts	$ 1	$ 4