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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 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 $ 118   $ 19
Derivatives not designated as hedging instruments 13 $ 12  
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 (18) (8)  
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Interest rate swaps 11 16  
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 27 1  
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 (7) 3  
Operating Expense [Member]      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Derivatives not designated as hedging instruments (1) 5  
Interest Expense [Member]      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Derivatives not designated as hedging instruments $ 28 $ (4)