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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables | $ 64,702 | $ 59,970 |  |
Less: allowance for loan losses | (1,886) | (1,978) | $ (944) | $ (911)
GM Financial receivables, net | 62,816 | 57,992 |  |
Commercial Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables | 6,609 | 8,682 |  |
Less: allowance for loan losses | (47) | (63) |  |
GM Financial receivables, net | 6,562 | 8,619 |  |
Dealer cash management balances | 1,000 | 1,400 |  |
Retail Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables | 58,093 | 51,288 |  |
Less: allowance for loan losses | (1,839) | (1,915) |  |
GM Financial receivables, net | 56,254 | 49,373 |  |
Level 2 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | 6,562 | 8,619 |  |
Level 3 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | $ 57,613 | $ 51,645 |  |

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