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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Short-term debt and current portion of long-term debt $ 95   $ 95   $ 23
Derivatives not designated as hedging instruments 37 $ 6 36 $ 46  
Debt due to Avis Budget Rental Car Funding (AESOP) LLC—related party 7,870   7,870   $ 7,358
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Interest rate swaps (4) 0 (25) 8  
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Interest rate swaps 32 3 37 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 10 6 21 25  
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 (1) 0 3 1  
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 0 (3) 0 (4)  
Operating Expense [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments 1 1 1 13  
Interest Expense [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments $ 9 $ 5 $ 20 $ 12