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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finance Receivables [Line Items]
GM Financial receivables	$ 95,294	$ 86,463
Less: allowance for loan losses	(2,458)	(2,344)	$ (2,096)	$ (1,886)
GM Financial receivables, net	92,836	84,119
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables	76,066	72,729
Less: allowance for loan losses	(2,400)	(2,308)
GM Financial receivables, net	73,667	70,421
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables	19,228	13,734
Less: allowance for loan losses	(58)	(36)
GM Financial receivables, net	19,169	13,698
Dealer cash management balances	3,400	2,600
Commercial Finance Receivables | Dealer Financing
Finance Receivables [Line Items]
GM Financial receivables	18,623	13,257
Commercial Finance Receivables | Other Financing
Finance Receivables [Line Items]
GM Financial receivables	604	476
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	19,169	13,698
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 74,729	$ 70,911

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