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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
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

Derivative Liabilities, Fair Value Adjustment on Discontinued Hedging Relationships

+ References

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- Definition

Derivative Liabilities, Increase (Decrease) in Fair Value Adjustment

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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