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Schedule Of Debt Under Vehicle Programs (Detail) - USD ($)
$ in Millions
1 Months Ended
Oct. 31, 2018
Apr. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2018
Jun. 30, 2018
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]            
Interest rate on capital leases         1.00%  
Leasing Vehicles And Related Assets Pledged As Collateralized Debt         $ 9,000  
Debt under vehicle programs     $ 9,221   10,232  
Debt Due To Rental Car Funding [Member]            
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]            
Debt Instrument, Issuance Date Oct. 01, 2018 Apr. 01, 2018 Dec. 01, 2017 Mar. 01, 2017    
Debt Instrument, Maturity Date Mar. 01, 2024 Sep. 01, 2023 Mar. 01, 2023 Sep. 01, 2022    
Asset-Backed Securities, at Carrying Value     $ 500 $ 600 550 $ 400
Leasing Vehicles And Related Assets Pledged As Collateralized Debt         8,000  
Debt under vehicle programs     6,516   7,393  
Deferred Finance Costs, Net     (36)   $ (35)  
Americas Debt Borrowings [Member]            
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]            
Debt, Weighted Average Interest Rate         3.00%  
Leasing Vehicles And Related Assets Pledged As Collateralized Debt         $ 900  
Debt under vehicle programs     $ 660   $ 635  
International Debt Borrowings            
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]            
Debt, Weighted Average Interest Rate     2.00%   2.00%  
Leasing Vehicles And Related Assets Pledged As Collateralized Debt         $ 2,300  
Debt under vehicle programs     $ 1,942   2,060  
International Capital Leases            
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]            
Leasing Vehicles And Related Assets Pledged As Collateralized Debt         200  
Debt under vehicle programs     146   191  
Other            
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]            
Debt under vehicle programs     1   2  
Debt Under Vehicle Programs [Member]            
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]            
Debt under vehicle programs         10,281  
Deferred Finance Costs, Net     $ (44)   $ (49)