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GM Financial Receivables and Transactions - Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Finance Receivables [Line Items]
GM Financial receivables	$ 92,759		$ 86,463
Less: allowance for loan losses	(2,377)	$ (2,311)	(2,344)	$ (2,258)	$ (2,202)	$ (2,096)
GM Finance receivables, net	90,382		84,119
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	18,321		13,698
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	73,614		70,911
Retail
Finance Receivables [Line Items]
GM Financial receivables	74,384		72,729	$ 71,704
Less: allowance for loan losses	(2,323)		(2,308)
GM Finance receivables, net	72,060		70,421
Commercial
Finance Receivables [Line Items]
GM Financial receivables	18,375		13,734
Less: allowance for loan losses	(54)		(36)
GM Finance receivables, net	18,321		13,698
Dealer cash management balance	3,200		2,600
Commercial | Dealer Financing
Finance Receivables [Line Items]
GM Financial receivables	17,844		13,257
Commercial | Other Financing
Finance Receivables [Line Items]
GM Financial receivables	$ 531		$ 476

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