Debt - Narrative (Details) - USD ($) $ in Billions	1 Months Ended		9 Months Ended
	Oct. 24, 2023	Mar. 31, 2023	Sep. 30, 2023	Feb. 28, 2023
Unsecured Debt | Line of Credit | Five Year Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate borrowing capacity		$ 10.0		$ 11.2
Unsecured Debt | Line of Credit | Three Year Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate borrowing capacity		4.1		$ 4.3
Unsecured Debt | Line of Credit | $6.0 Billion Dollar Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Debt term	364 days
Aggregate borrowing capacity	$ 6.0
Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount		$ 1.5
Weighted average interest rate (percent)		4.875%
GM Financial | Unsecured Debt | Line of Credit | Five Year Revolving Credit Facility
Debt Instrument [Line Items]
Debt term		5 years
GM Financial | Unsecured Debt | Line of Credit | Three Year Revolving Credit Facility
Debt Instrument [Line Items]
Debt term		3 years
GM Financial | 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
GM Financial | Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount			$ 8.3
Weighted average interest rate (percent)			5.50%
GM Financial | Secured Debt | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Increase to maximum borrowing capacity			$ 17.7
GM Financial | Secured Debt | Notes Payable, Other Payables | Securitization Notes Payable
Debt Instrument [Line Items]
Principal amount			$ 18.1
Weighted average interest rate (percent)			5.50%