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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Finance Receivables [Line Items] |  |  |  |
GM Financial receivables, net of fees | $ 60,107 | $ 59,970 |  |
Less: allowance for loan losses | (1,835) | (1,978) | $ (1,966) | $ (944)
GM Financial receivables, net | 58,272 | 57,992 |  |
Retail Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables, net of fees | 53,397 | 51,288 | $ 42,474 |
Less: allowance for loan losses | (1,784) | (1,915) |  |
GM Financial receivables, net | 51,613 | 49,373 |  |
Commercial Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables, net of fees | 6,710 | 8,682 |  |
Less: allowance for loan losses | (51) | (63) |  |
GM Financial receivables, net | 6,659 | 8,619 |  |
Dealer cash management balance | 1,500 | 1,400 |  |
Level 2 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | 6,659 | 8,619 |  |
Level 3 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | $ 53,524 | $ 51,645 |  |

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