Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 29		$ 57
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	29	[1]	57	[1]
Long-term debt, excluding convertible debt	3,241	[1]	2,720	[1]
Convertible debt	77	[1]	128	[1]
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding (AESOP) LLC	5,873		5,203
Vehicle-backed debt	1,586		1,599
Interest rate swaps and interest rate contracts	3	[2]	4	[2]
Estimate Of Fair Value, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	29	[1]	58	[1]
Long-term debt, excluding convertible debt	3,443	[1]	2,903	[1]
Convertible debt	133	[1]	171	[1]
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding (AESOP) LLC	6,074		5,391
Vehicle-backed debt	1,602		1,613
Interest rate swaps and interest rate contracts	$ 3	[2]	$ 4	[2]

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

[2] Derivatives in a liability position.