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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, 2024 | Dec. 31, 2023
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Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | $ 37,970 | $ 33,551
Cumulative Amount of Fair Value Hedging Adjustments | 771 | 1,029
Cumulative fair value adjustment on discontinued hedging relationships | 752 | 872
Short-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 7,168 | 3,508
Cumulative Amount of Fair Value Hedging Adjustments | (18) | (8)
Long-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 30,802 | 30,043
Cumulative Amount of Fair Value Hedging Adjustments | $ 788 | $ 1,037

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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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