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Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - GM Financial - Fair Value Hedges - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | $ 37,684 | $ 36,664
Cumulative Amount of Fair Value Hedging Adjustments | 960 | 1,281
Cumulative fair value adjustment on discontinued hedging relationships | 669 | 719
Short-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 6,802 | 6,406
Cumulative Amount of Fair Value Hedging Adjustments | (2) | (6)
Long-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 30,882 | 30,258
Cumulative Amount of Fair Value Hedging Adjustments | $ 963 | $ 1,287

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- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE + Details
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