Related Party Transactions - Retail Vehicle Acquisitions (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Related Party Transaction [Line Items] | |||
| Vehicle inventory | $ 1,876 | $ 3,149 | |
| Cost of goods sold, related to vehicles acquired | 12,358 | 10,885 | $ 4,793 |
| Used Vehicles | DriveTime Automotive Group, Inc. | Related Parties | |||
| Related Party Transaction [Line Items] | |||
| Vehicle inventory | 1 | 19 | |
| Used Vehicle Sales | DriveTime Automotive Group, Inc. | Related Parties | |||
| Related Party Transaction [Line Items] | |||
| Cost of goods sold, related to vehicles acquired | $ 22 | $ 62 | |