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GM Financial Receivables and Transactions - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Proceeds from sale of finance receivables (Note 4) |  | $ 2,005 | $ 0
GM Financial |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Proceeds from sale of finance receivables (Note 4) | $ 2,000 |  |
Outstanding balance of the transferred finance receivables | $ 1,900 | $ 1,900 |

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