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Related Party Transactions - Wholesale Marketplace Revenues (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 $ 5,647 $ 3,655 $ 14,719 $ 10,126
Cost of sales 4,499 2,848 11,578 8,013
Related Party        
Related Party Transaction [Line Items]        
Cost of sales 3 2 10 7
DriveTime Automotive Group, Inc. | Wholesale Marketplace Revenues | Related Party        
Related Party Transaction [Line Items]        
Net sales and operating revenues 3 4 10 11
Cost of sales $ 0 $ 1 $ 1 $ 2