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Debt - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Apr. 30, 2022	Sep. 30, 2022	Aug. 31, 2022
Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount			$ 2,250
Weighted average interest rate (percent)			5.51%
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	$ 2,000	$ 2,000
GM Financial | Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount		$ 7,700
Weighted average interest rate (percent)		3.39%
GM Financial | Secured Debt | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate borrowing capacity		$ 18,300
GM Financial | Secured Debt | Notes Payable, Other Payables | Securitization notes payable
Debt Instrument [Line Items]
Principal amount		$ 18,000
Weighted average interest rate (percent)		2.85%

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Face (par) amount of debt instrument at time of issuance.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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