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Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - GM Financial - Fair Value Hedges - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | $ 35,201 | $ 36,664
Cumulative Amount of Fair Value Hedging Adjustments | 668 | 1,281
Cumulative fair value adjustment on discontinued hedging relationships | 472 | 719
Short-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 3,873 | 6,406
Cumulative Amount of Fair Value Hedging Adjustments | 27 | (6)
Long-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 31,328 | 30,258
Cumulative Amount of Fair Value Hedging Adjustments | $ 641 | $ 1,287

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