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Related Party Transactions - Servicing and Administrative Fees (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
DriveTime Automotive Group, Inc. | Servicing and Administrative Fees | Related Party        
Related Party Transaction [Line Items]        
General and administrative expense $ 2 $ 2 $ 5 $ 7