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Related Party Transactions - Master Dealer Agreement (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]        
Net sales and operating revenues, from related parties $ 5,647 $ 3,655 $ 14,719 $ 10,126
DriveTime Automotive Group, Inc. | Master Dealer Agreement | Related Party        
Related Party Transaction [Line Items]        
Net sales and operating revenues, from related parties 91 50 242 136
General and administrative expense $ 7 $ 5 $ 18 $ 13