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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule of Cost-method Investments [Line Items]          
Long-term Debt, Current Maturities $ 26   $ 26   $ 279
Derivatives not designated as hedging instruments (23) $ 6 (90) $ 1  
Debt due to Avis Budget Rental Car Funding (AESOP) LLC—related party 6,785   6,785   $ 6,695
Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivative, Notional Amount 1,100   1,100    
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items]          
Interest rate swaps 1 4 0 (4)  
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Interest rate swaps (13) (3) (44) (11)  
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments (11) 5 (44) 17  
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments 1 0 (1) 0  
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments (1) 0 (1) (1)  
Operating Expense [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments 4 3 19 26  
Interest Expense [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments $ 7 $ 8 $ 25 $ 43