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Subsequent Events - Additional Information (Detail) - USD ($)
shares in Millions
1 Months Ended
Feb. 29, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2014
Subsequent Event [Line Items]              
Common Stock, Shares, Issued     137.0   137.0    
Subsequent Event              
Subsequent Event [Line Items]              
Proceeds from Issuance of Preferred Stock and Preference Stock $ 110            
Common Stock, Shares, Issued 0.4            
Debt Due To Rental Car Funding [Member]              
Subsequent Event [Line Items]              
Asset-Backed Securities, at Carrying Value     $ 550,000,000     $ 400,000,000  
Debt Due To Rental Car Funding [Member] | Subsequent Event              
Subsequent Event [Line Items]              
Asset-Backed Securities, at Carrying Value   $ 700,000,000          
Debt, Weighted Average Interest Rate   2.42%          
Five And One Over Two Senior Notes [Member] | Senior Notes [Member]              
Subsequent Event [Line Items]              
Debt Instrument, Face Amount     $ 75,000,000 $ 400,000,000     $ 175,000,000
Five And One Over Two Senior Notes [Member] | Senior Notes [Member] | Subsequent Event              
Subsequent Event [Line Items]              
Debt Instrument, Face Amount $ 100,000,000            
Floating Rate Term Loan Due August 2027 [Member] | Loans Payable [Member] | Subsequent Event              
Subsequent Event [Line Items]              
Debt Instrument, Face Amount $ 1,200,000,000