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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule of Cost-method Investments [Line Items]      
Long-term Debt, Current Maturities $ 26   $ 26
Derivatives not designated as hedging instruments (16) $ (17)  
Debt due to Avis Budget Rental Car Funding (AESOP) LLC—related party 7,754   $ 6,480
Interest Rate Swaps [Member]      
Schedule of Cost-method Investments [Line Items]      
Derivative, Notional Amount 1,000    
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]      
Schedule of Cost-method Investments [Line Items]      
Interest rate swaps 6 1  
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]      
Schedule of Cost-method Investments [Line Items]      
Interest rate swaps (13) (5)  
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]      
Schedule of Cost-method Investments [Line Items]      
Derivatives not designated as hedging instruments (9) (12)  
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]      
Schedule of Cost-method Investments [Line Items]      
Derivatives not designated as hedging instruments 0 (1)  
Operating Expense [Member]      
Schedule of Cost-method Investments [Line Items]      
Derivatives not designated as hedging instruments 4 5  
Interest Expense [Member]      
Schedule of Cost-method Investments [Line Items]      
Derivatives not designated as hedging instruments $ 13 $ 7