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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | $ 72,686 |  | $ 64,702 |  |  |
Less: allowance for loan losses | (2,086) | $ (2,027) | (1,886) | $ (1,903) | $ (1,850) | $ (1,978)
GM Financial receivables, net | 70,600 |  | 62,816 |  |  |
Retail Finance Receivables |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | 63,461 |  | 58,093 | $ 57,424 |  |
Less: allowance for loan losses | (2,044) |  | (1,839) |  |  |
GM Financial receivables, net | 61,416 |  | 56,254 |  |  |
Commercial Finance Receivables |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | 9,225 |  | 6,609 |  |  |
Less: allowance for loan losses | (42) |  | (47) |  |  |
GM Financial receivables, net | 9,183 |  | 6,562 |  |  |
Dealer cash management balance | 1,500 |  | 1,000 |  |  |
Level 2 |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | 9,183 |  | 6,562 |  |  |
Level 3 |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | $ 59,890 |  | $ 57,613 |  |  |

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