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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | $ 61,801 |  | $ 59,970 |  |  |
Less: allowance for loan losses | (1,850) | $ (1,835) | (1,978) | $ (2,111) | $ (1,966) | $ (944)
GM Financial receivables, net | 59,951 |  | 57,992 |  |  |
Retail Finance Receivables |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | 56,357 |  | 51,288 | $ 46,472 |  |
Less: allowance for loan losses | (1,805) |  | (1,915) |  |  |
GM Financial receivables, net | 54,552 |  | 49,373 |  |  |
Commercial Finance Receivables |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | 5,444 |  | 8,682 |  |  |
Less: allowance for loan losses | (45) |  | (63) |  |  |
GM Financial receivables, net | 5,399 |  | 8,619 |  |  |
Dealer cash management balance | 1,100 |  | 1,400 |  |  |
Level 2 |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | 5,399 |  | 8,619 |  |  |
Level 3 |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | $ 56,490 |  | $ 51,645 |  |  |

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