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Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - Fair Value Hedges - GM Financial - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | $ 29,843 | $ 28,319
Cumulative Amount of Fair Value Hedging Adjustments | 897 | 781
Cumulative fair value adjustment on discontinued hedging relationships | 461 |
Short-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 2,763 | 3,048
Cumulative Amount of Fair Value Hedging Adjustments | (13) | 2
Long-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 27,080 | 25,271
Cumulative Amount of Fair Value Hedging Adjustments | $ 910 | $ 779

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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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