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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, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	$ 28,646	$ 24,964
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships	454	(226)
Short-term unsecured debt
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	3,042	1,338
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships	8	(1)
Long-term unsecured debt
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	25,604	23,626
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships	$ 446	(225)
Cumulative fair value adjustment on discontinued hedging relationships		$ 246

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- Definition

Derivative Liabilities, Fair Value Adjustment on Discontinued Hedging Relationships

+ References

No definition available.

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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.

+ References

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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 https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

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