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GM Financial Receivables and Transactions - Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Finance Receivables [Line Items]
GM Financial receivables	$ 92,558		$ 95,294
Less: allowance for loan losses	(2,736)	$ (2,720)	(2,458)	$ (2,377)	$ (2,311)	$ (2,344)
GM Financial receivables, net	89,821		92,836
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	16,615		19,169
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	74,957		74,729
Retail
Finance Receivables [Line Items]
GM Financial receivables	75,857		76,066	$ 74,384
Less: allowance for loan losses	(2,651)		(2,400)
GM Financial receivables, net	73,206		73,667
Commercial
Finance Receivables [Line Items]
GM Financial receivables	16,700		19,228
Less: allowance for loan losses	(85)		(58)
GM Financial receivables, net	16,615		19,169
Dealer cash management balance	3,400		3,400
Commercial | Dealer Financing
Finance Receivables [Line Items]
GM Financial receivables	16,230		18,623
Commercial | Other Financing
Finance Receivables [Line Items]
GM Financial receivables	$ 471		$ 604

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