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Debt - Narrative (Details) - GM Financial - USD ($) $ in Billions	1 Months Ended	6 Months Ended
	Apr. 30, 2022	Jun. 30, 2022
Unsecured Debt | Line of Credit | $2.0 Billion Dollar Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	364 days	364 days
Aggregate borrowing capacity	$ 2.0	$ 2.0
Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount		$ 7.6
Weighted average interest rate (percent)		3.35%
Secured Debt | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate borrowing capacity		$ 10.6
Secured Debt | Notes Payable, Other Payables | Securitization notes payable
Debt Instrument [Line Items]
Principal amount		$ 12.3
Weighted average interest rate (percent)		2.57%

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