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Debt - Narrative (Details) $ in Billions	1 Months Ended	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)
Unsecured Debt | Delayed Draw Term Loan Credit Agreement
Debt Instrument [Line Items]
Debt term	364 days
Aggregate borrowing capacity	$ 3.0	$ 3.0
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	$ 4.4	$ 4.4
Weighted average interest rate (percent)	5.30%	5.30%
GM Financial | Secured Debt | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Increase to maximum borrowing capacity		$ 2.4
GM Financial | Secured Debt | Notes Payable, Other Payables | Securitization Notes Payable
Debt Instrument [Line Items]
Principal amount	$ 7.3	$ 7.3
Weighted average interest rate (percent)	5.40%	5.40%

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