Related Party Transactions - Master Dealer Agreement (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Related Party Transaction [Line Items]
Net sales and operating revenues, from related parties	$ 4,840	$ 3,410	$ 9,072	$ 6,471
DriveTime Automotive Group, Inc. \| Master Dealer Agreement \| Related Party
Related Party Transaction [Line Items]
Net sales and operating revenues, from related parties	81	45	151	86
General and administrative expense	$ 6	$ 4	$ 11	$ 8

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details