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Schedule Of Debt Under Vehicle Programs (Detail) - USD ($)
$ in Millions
1 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]          
Interest rate on capital leases 1.00%       2.00%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt $ 8,200        
Debt under vehicle programs $ 9,221       $ 8,878
Debt Due To Rental Car Funding [Member]          
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]          
Debt Instrument, Issuance Date Dec. 01, 2017 Mar. 01, 2017 Jun. 01, 2016 Mar. 01, 2016  
Debt Instrument, Maturity Date Mar. 01, 2023 Sep. 01, 2022 Nov. 01, 2021 Jun. 01, 2021  
Asset-Backed Securities, at Carrying Value $ 500 $ 600 $ 500 $ 450  
Leasing Vehicles And Related Assets Pledged As Collateralized Debt 8,000        
Debt under vehicle programs 6,516       6,733
Deferred Finance Costs, Net $ (36)       $ (38)
Americas Debt Borrowings [Member]          
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]          
Debt, Weighted Average Interest Rate 3.00%       4.00%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt $ 900        
Debt under vehicle programs $ 660       $ 577
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       $ 1,449
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       162
Other          
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]          
Debt under vehicle programs 1       7
Debt Under Vehicle Programs [Member]          
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]          
Debt under vehicle programs 9,265        
Deferred Finance Costs, Net $ (44)       $ (50)