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Financial Instruments (Schedule Of Effect Of Derivatives Recognized) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Cost-method Investments [Line Items]          
Document Period End Date     Sep. 30, 2018    
Interest Expense $ 44 $ 45 $ 139 $ 142  
Document Fiscal Year Focus     2018    
Long-term Debt, Current Maturities 23   $ 23   $ 26
Derivatives not designated as hedging instruments 6 (23) 46 (90)  
Debt due to Avis Budget Rental Car Funding (AESOP) LLC—related party 7,122   7,122   $ 6,480
Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivative, Notional Amount 1,500   1,500    
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]          
Schedule of Cost-method Investments [Line Items]          
Interest rate swaps 0 1 8 0  
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Interest rate swaps 3 (13) 16 (44)  
Not Designated As Hedging Instruments [Member]          
Schedule of Cost-method Investments [Line Items]          
Interest Income, Other 5   12    
Interest Expense   7   25  
Interest Expense Domestic Deposit Liabilities 1 (4) 13 (19)  
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments 6 (11) 25 (44)  
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments 0 1 1 (1)  
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]          
Schedule of Cost-method Investments [Line Items]          
Derivatives not designated as hedging instruments $ (3) $ (1) $ (4) $ (1)