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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Short-term debt and current portion of long-term debt $ 19   $ 19   $ 19
Derivatives not designated as hedging instruments (28) $ (13) (10) $ (1)  
Debt due to Avis Budget Rental Car Funding (AESOP) LLC—related party         $ 7,936
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Interest rate swaps (8) (13) (26) (21)  
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Interest rate swaps (13) (11) (2) 5  
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments (8) 10 26 11  
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments 2 1 (7) 4  
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments (1) 0 $ (1) $ 0  
Operating Expense [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments $ (8) 5      
Interest Expense [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments   $ (15)