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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 83,469		$ 76,310
Less: allowance for loan losses	(2,258)	$ (2,202)	(2,096)	$ (2,086)	$ (2,027)	$ (1,886)
GM Financial receivables, net	81,211		74,214
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	71,704		65,322	$ 63,461
Less: allowance for loan losses	(2,224)		(2,062)
GM Financial receivables, net	69,480		63,260
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	11,765		10,988
Less: allowance for loan losses	(34)		(34)
GM Financial receivables, net	11,731		10,954
Dealer cash management balance	2,400		1,900
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	11,731		10,954
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 68,690		$ 62,150

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