Related Party Transactions - Profit Sharing Agreement (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Related Party Transaction [Line Items]
Net sales and operating revenues, from related parties	$ 8,040	$ 5,647	$ 21,848	$ 14,719
Other sales and revenues
Related Party Transaction [Line Items]
Net sales and operating revenues, from related parties	594	474	1,646	1,274
DriveTime Automotive Group, Inc. \| Other sales and revenues
Related Party Transaction [Line Items]
Net sales and operating revenues, from related parties	$ 4	$ 2	$ 11	$ 6

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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