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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 61,801		$ 59,970
Less: allowance for loan losses	(1,850)	$ (1,835)	(1,978)	$ (2,111)	$ (1,966)	$ (944)
GM Financial receivables, net	59,951		57,992
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	56,357		51,288	$ 46,472
Less: allowance for loan losses	(1,805)		(1,915)
GM Financial receivables, net	54,552		49,373
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	5,444		8,682
Less: allowance for loan losses	(45)		(63)
GM Financial receivables, net	5,399		8,619
Dealer cash management balance	1,100		1,400
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	5,399		8,619
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 56,490		$ 51,645

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