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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finance Receivables [Line Items]
GM Financial receivables	$ 59,970	$ 53,900
Less: allowance for loan losses	(1,978)	(944)	$ (911)	$ (942)
GM Financial receivables, net	57,992	52,956
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables	8,682	11,671
Less: allowance for loan losses	(63)	(78)
GM Financial receivables, net	8,619	11,593
Dealer cash management balances	1,400	1,200
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables	51,288	42,229
Less: allowance for loan losses	(1,915)	(866)
GM Financial receivables, net	49,373	41,363
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	8,619	11,593
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 51,645	$ 41,973

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