Related Party Transactions - Wholesale Marketplace Revenues (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	$ 4,840	$ 3,410	$ 9,072	$ 6,471
Cost of sales	3,776	2,695	7,079	5,165
Related Party
Related Party Transaction [Line Items]
Cost of sales	4	3	7	5
DriveTime Automotive Group, Inc. \| Wholesale Marketplace Revenues \| Related Party
Related Party Transaction [Line Items]
Net sales and operating revenues	3	3	7	7
Cost of sales	$ 1	$ 1	$ 1	$ 1

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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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+ Details

- 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