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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Cost-method Investments [Line Items]          
Document Period End Date     Jun. 30, 2018    
Long-term Debt, Current Maturities $ 24   $ 24   $ 26
Derivatives not designated as hedging instruments 56 $ (50) 40 $ (67)  
Debt due to Avis Budget Rental Car Funding (AESOP) LLC—related party 8,265   8,265   $ 6,480
Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivative, Notional Amount 1,000   1,000    
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items]          
Interest rate swaps 2 (2) 8 (1)  
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Interest rate swaps 26 (26) 13 (31)  
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments 28 (21) 19 (33)  
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments 1 (1) 1 (2)  
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) 0  
Operating Expense [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments 8 10 12 15  
Interest Expense [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments $ 20 $ 11 $ 7 $ 18