Related Party Transactions - Aircraft Time Sharing Agreement (Details) - Related Party $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 22, 2015 aircraft	Feb. 28, 2021	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2017 aircraft
DriveTime Automotive Group, Inc. | Aircraft Time Sharing Agreement | Air Transportation Equipment
Related Party Transaction [Line Items]
Contractual agreement term	12 months
Contractual agreement, perpetual automatic renewal	12 months
Number of allowable days prior to contract termination with written notice	30 days
DriveTime Automotive Group, Inc. | Shared Services Agreement with DriveTime
Related Party Transaction [Line Items]
Number of allowable days prior to contract termination with written notice		30 days
Verde Investments, Inc. | Aircraft Time Sharing Agreement | Air Transportation Equipment
Related Party Transaction [Line Items]
Reimbursement expense (less than) | $			$ 1	$ 1	$ 1	$ 1
Verde Investments, Inc. | DriveTime Automotive Group, Inc. | Aircraft Time Sharing Agreement | Air Transportation Equipment
Related Party Transaction [Line Items]
Number of aircrafts | aircraft	2						2