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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 54,234	$ 53,900
Less: allowance for loan losses	(1,966)	(944)	$ (924)	$ (911)
GM Financial receivables, net	52,268	52,956
Retail Finance Receivables [Member]
Finance Receivables [Line Items]
GM Financial receivables, net of fees	42,474	42,229
Less: allowance for loan losses	(1,879)	(866)
GM Financial receivables, net	40,595	41,363
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
GM Financial receivables, net of fees	11,760	11,671
Less: allowance for loan losses	(87)	(78)
GM Financial receivables, net	11,673	11,593
Dealer cash management balance	1,200	1,200
Level 2 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	11,673	11,593
Level 3 [Member]
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 41,933	$ 41,973

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