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Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - Fair Value Hedges - GM Financial - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | $ 24,533 | $ 23,315
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | (296) | (739)
Short-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 1,848 | 4,858
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | (11) | (69)
Long-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 22,685 | 18,457
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | (285) | (670)
Cumulative fair value adjustment on discontinued hedging relationships | $ 245 | $ 200

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- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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