Debt - Narrative (Details) - GM Financial $ in Billions	1 Months Ended	3 Months Ended
Mar. 31, 2026 USD ($)	Mar. 31, 2026 USD ($)
Unsecured Debt \| Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 2.0	$ 2.0
Weighted average interest rate (percent)	4.96%	4.96%
Unsecured Debt \| $2.0 Billion Dollar Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Debt term	364 days	364 days
Aggregate borrowing capacity	$ 2.0	$ 2.0
Secured debt \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate borrowing capacity	2.5	2.5
Secured debt \| Securitization Notes Payable \| Notes Payable, Other Payables
Debt Instrument [Line Items]
Principal amount	$ 4.5	$ 4.5
Weighted average interest rate (percent)	4.18%	4.18%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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