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Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - Fair Value Hedges - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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GM Financial |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | $ 36,664 | $ 33,551
Cumulative Amount of Fair Value Hedging Adjustments | 1,281 | 1,029
Cumulative fair value adjustment on discontinued hedging relationships | 719 | 872
Automotive |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 4,405 | 670
Cumulative Amount of Fair Value Hedging Adjustments | 48 | (34)
Short-term Unsecured Debt | GM Financial |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 6,406 | 3,508
Cumulative Amount of Fair Value Hedging Adjustments | (6) | (8)
Short-term Unsecured Debt | Automotive |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 0 | 0
Cumulative Amount of Fair Value Hedging Adjustments | 0 | 0
Long-term Unsecured Debt | GM Financial |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 30,258 | 30,043
Cumulative Amount of Fair Value Hedging Adjustments | 1,287 | 1,037
Long-term Unsecured Debt | Automotive |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 4,405 | 670
Cumulative Amount of Fair Value Hedging Adjustments | $ 48 | $ (34)

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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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