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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 $ 420   $ 420   $ 23
Derivatives not designated as hedging instruments 13 $ (56) 1 $ (40)  
Debt due to Avis Budget Rental Car Funding (AESOP) LLC—related party 8,913   8,913   $ 7,358
Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivative, Notional Amount 1,500   1,500    
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Interest rate swaps (13) 2 (21) 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) 26 5 13  
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) (28) (11) (19)  
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) (1) (4) (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 1 0 1  
Operating Expense [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments (5) 8 12    
Interest Expense [Member]          
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)          
Derivatives not designated as hedging instruments $ 15 $ (20) $ (11) $ 7