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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
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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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