Debt - Narrative (Details) - GM Financial - USD ($) $ in Billions	1 Months Ended	6 Months Ended
Mar. 31, 2026	Jun. 30, 2026
Unsecured Debt \| Senior Notes
Debt Instrument [Line Items]
Principal amount		$ 5.5
Weighted average interest rate (percent)		4.84%
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		12.0
Secured debt \| Securitization Notes Payable \| Notes Payable, Other Payables
Debt Instrument [Line Items]
Principal amount		$ 8.5
Weighted average interest rate (percent)		4.12%

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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