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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 61,641		$ 59,970
Less: allowance for loan losses	(1,903)	$ (1,850)	(1,978)	$ (2,003)	$ (2,111)	$ (944)
GM Financial receivables, net	59,738		57,992
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	57,424		51,288	$ 48,694
Less: allowance for loan losses	(1,863)		(1,915)
GM Financial receivables, net	55,561		49,373
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	4,217		8,682
Less: allowance for loan losses	(40)		(63)
GM Financial receivables, net	4,177		8,619
Dealer cash management balance	909		1,400
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	4,177		8,619
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 57,330		$ 51,645

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