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Debt - Narrative (Details) $ in Billions	1 Months Ended	3 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2025 USD ($)
Unsecured Debt | $10.0 Billion Dollar Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt term	5 years
Aggregate borrowing capacity	$ 10.0	$ 10.0
Unsecured Debt | 4.1 Billion Dollar Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt term	3 years
Aggregate borrowing capacity	$ 4.1	4.1
Unsecured Debt | GM Financial | Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 6.1	$ 6.1
Weighted average interest rate (percent)	5.20%	5.20%
Unsecured Debt | GM Financial | $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 | GM Financial | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate borrowing capacity	2.5	2.5
Secured Debt | GM Financial | Securitization Notes Payable | Notes Payable, Other Payables
Debt Instrument [Line Items]
Principal amount	$ 7.9	$ 7.9
Weighted average interest rate (percent)	4.80%	4.80%

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