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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 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 $ 23   $ 23
Derivatives not designated as hedging instruments 12 $ (16)  
Debt due to Avis Budget Rental Car Funding (AESOP) LLC—related party 8,540   $ 7,358
Interest Rate Swaps [Member]      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Derivative, Notional Amount 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 (8) 6  
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Interest rate swaps 16 (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 1 (9)  
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 3 0  
Operating Expense [Member]      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Derivatives not designated as hedging instruments 5 4  
Interest Expense [Member]      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Derivatives not designated as hedging instruments $ 4 $ 13