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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 60,107	$ 59,970
Less: allowance for loan losses	(1,835)	(1,978)	$ (1,966)	$ (944)
GM Financial receivables, net	58,272	57,992
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	53,397	51,288	$ 42,474
Less: allowance for loan losses	(1,784)	(1,915)
GM Financial receivables, net	51,613	49,373
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	6,710	8,682
Less: allowance for loan losses	(51)	(63)
GM Financial receivables, net	6,659	8,619
Dealer cash management balance	1,500	1,400
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	6,659	8,619
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 53,524	$ 51,645

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