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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables | $ 95,294 | $ 86,463 |  |
Less: allowance for loan losses | (2,458) | (2,344) | $ (2,096) | $ (1,886)
GM Financial receivables, net | 92,836 | 84,119 |  |
Retail Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables | 76,066 | 72,729 |  |
Less: allowance for loan losses | (2,400) | (2,308) |  |
GM Financial receivables, net | 73,667 | 70,421 |  |
Commercial Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables | 19,228 | 13,734 |  |
Less: allowance for loan losses | (58) | (36) |  |
GM Financial receivables, net | 19,169 | 13,698 |  |
Dealer cash management balances | 3,400 | 2,600 |  |
Commercial Finance Receivables | Dealer Financing |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables | 18,623 | 13,257 |  |
Commercial Finance Receivables | Other Financing |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables | 604 | 476 |  |
Level 2 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | 19,169 | 13,698 |  |
Level 3 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | $ 74,729 | $ 70,911 |  |

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