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Related Party Transactions - Wholesale Vehicle Sales and Purchases (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
Payments for vehicle inventory     96 67
Wholesale sales and revenues        
Related Party Transaction [Line Items]        
Net sales and operating revenues, from related parties 1,177 786 3,064 2,163
Wholesale sales and revenues | Related Party        
Related Party Transaction [Line Items]        
Net sales and operating revenues, from related parties 11 7 28 21
DriveTime Automotive Group, Inc. | Wholesale sales and revenues | Related Party        
Related Party Transaction [Line Items]        
Net sales and operating revenues, from related parties 8 3 18 10
Payments for vehicle inventory $ 4 $ 1 $ 10 $ 3