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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
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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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