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Related Party Transactions - Corporate Office Leases (Details) - Related Party
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2019
renewal_option
Sep. 30, 2016
renewal_option
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
DriveTime Automotive Group, Inc. | Corporate Headquarters, Office Lease and Subleased Office Space, First Floor            
Related Party Transaction [Line Items]            
Operating lease term   83 months        
Operating lease, number of renewal options | renewal_option   3        
Operating leases, renewal term   5 years        
DriveTime Automotive Group, Inc. | Subleased Office Space, First Floor            
Related Party Transaction [Line Items]            
Expenses from transactions with related party | $     $ 1 $ 1 $ 1 $ 1
Verde Investments, Inc. | Office Building Lease | Tempe, Arizona            
Related Party Transaction [Line Items]            
Operating lease term 10 years          
Operating lease, number of renewal options | renewal_option 2          
Operating leases, renewal term 5 years          
Expenses from transactions with related party | $     $ 1 $ 1 $ 1 $ 1