Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 181		$ 57
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	181		57
Long-term debt, excluding convertible debt	3,128		2,720
Convertible debt	75		128
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding (AESOP) LLC	6,128		5,203
Vehicle-backed debt	2,502		1,599
Interest rate swaps and interest rate contracts	6	[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	181	[2]	58	[2]
Long-term debt, excluding convertible debt	3,192	[2]	2,903	[2]
Convertible debt	135	[2]	171	[2]
Debt under vehicle programs Vehicle-backed debt due to Avis Budget Rental Car Funding (AESOP) LLC	6,231	[2]	5,391	[2]
Vehicle-backed debt	2,510	[2]	1,613	[2]
Interest rate swaps and interest rate contracts	$ 6	[1],[2]	$ 4	[1],[2]

[1] Derivatives in a liability position.

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