GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 72,686		$ 64,702
Less: allowance for loan losses	(2,086)	$ (2,027)	(1,886)	$ (1,903)	$ (1,850)	$ (1,978)
GM Financial receivables, net	70,600		62,816
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	63,461		58,093	$ 57,424
Less: allowance for loan losses	(2,044)		(1,839)
GM Financial receivables, net	61,416		56,254
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	9,225		6,609
Less: allowance for loan losses	(42)		(47)
GM Financial receivables, net	9,183		6,562
Dealer cash management balance	1,500		1,000
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	9,183		6,562
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 59,890		$ 57,613