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GM Financial Receivables and Transactions - Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables | $ 92,759 |  | $ 86,463 |  |  |
Less: allowance for loan losses | (2,377) | $ (2,311) | (2,344) | $ (2,258) | $ (2,202) | $ (2,096)
GM Finance receivables, net | 90,382 |  | 84,119 |  |  |
Level 2 |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | 18,321 |  | 13,698 |  |  |
Level 3 |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | 73,614 |  | 70,911 |  |  |
Retail |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables | 74,384 |  | 72,729 | $ 71,704 |  |
Less: allowance for loan losses | (2,323) |  | (2,308) |  |  |
GM Finance receivables, net | 72,060 |  | 70,421 |  |  |
Commercial |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables | 18,375 |  | 13,734 |  |  |
Less: allowance for loan losses | (54) |  | (36) |  |  |
GM Finance receivables, net | 18,321 |  | 13,698 |  |  |
Dealer cash management balance | 3,200 |  | 2,600 |  |  |
Commercial | Dealer Financing |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables | 17,844 |  | 13,257 |  |  |
Commercial | Other Financing |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables | $ 531 |  | $ 476 |  |  |

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