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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Finance Receivables [Line Items]
GM Financial receivables	$ 89,841		$ 86,463
Less: allowance for loan losses	(2,311)	$ (2,355)	(2,344)	$ (2,202)	$ (2,152)	$ (2,096)
GM Finance receivables	87,530		84,119
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables	73,335		72,729	$ 69,722
Less: allowance for loan losses	(2,261)		(2,308)
GM Finance receivables	71,074		70,421
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables	16,506		13,734
Less: allowance for loan losses	(50)		(36)
GM Finance receivables	16,456		13,698
Dealer cash management balance	3,000		2,600
Commercial Finance Receivables | Dealer Financing
Finance Receivables [Line Items]
GM Financial receivables	16,075		13,257
GM Finance receivables	16,100		13,300
Commercial Finance Receivables | Other Financing
Finance Receivables [Line Items]
GM Finance receivables	431		476
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	16,456		13,698
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 71,552		$ 70,911

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