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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 56,756		$ 53,900
Less: allowance for loan losses	(2,003)	$ (2,111)	(944)	$ (933)	$ (957)	$ (911)
GM Financial receivables, net	54,753		52,956
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
GM Financial receivables, net of fees	48,694		42,229
Less: allowance for loan losses	(1,936)		(866)
GM Financial receivables, net	46,758		41,363
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
GM Financial receivables, net of fees	8,062		11,671
Less: allowance for loan losses	(67)		(78)
GM Financial receivables, net	7,995		11,593
Dealer cash management balance	1,400		1,200
Level 2 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	7,995		11,593
Level 3 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 48,972		$ 41,973

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