Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 393		$ 89
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	327		23
Long Term Debt Excluding Convertible Debt	3,303		3,305
Convertible debt	66		66
Debt Due To Avis Budget Rental Car Funding Aesop Llc Related Party	6,359		5,656
Vehicle-backed debt	1,631		1,668
Debt Under Vehicle Programs Interest Rate Swaps And Interest Rate Contracts	9	[1]	13	[1]
Estimate Of Fair Value, Fair Value Disclosure [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	348		23
Long Term Debt Excluding Convertible Debt	3,397		3,416
Convertible debt	197		159
Debt Due To Avis Budget Rental Car Funding Aesop Llc Related Party	6,493		5,732
Vehicle-backed debt	1,640		1,675
Debt Under Vehicle Programs Interest Rate Swaps And Interest Rate Contracts	$ 9	[1]	$ 13	[1]

[1] Derivatives in a liability position.