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Subsequent Events - Additional Information (Detail) - Debt Due To Rental Car Funding [Member] - USD ($)
$ in Millions
Feb. 01, 2019
Dec. 31, 2018
Subsequent Event [Line Items]    
Asset-Backed Securities, at Carrying Value   $ 8,883
Subsequent Event    
Subsequent Event [Line Items]    
Asset-Backed Securities, at Carrying Value $ 600  
Debt, Weighted Average Interest Rate 4.00%