Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 221		$ 57
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	221		57
Long-term debt, excluding convertible debt	3,120		2,720
Convertible debt	75		128
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding (AESOP) LLC	6,986		5,203
Vehicle-backed debt	2,363		1,599
Interest rate swaps and interest rate contracts	8	[1]	4	[1]
Estimate Of Fair Value, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	221	[2]	58	[2]
Long-term debt, excluding convertible debt	3,193	[2]	2,903	[2]
Convertible debt	138	[2]	171	[2]
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding (AESOP) LLC	7,085	[2]	5,391	[2]
Vehicle-backed debt	2,370	[2]	1,613	[2]
Interest rate swaps and interest rate contracts	$ 8	[1],[2]	$ 4	[1],[2]

[1] Derivatives in a liability position.

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