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Derivative Financial Instruments - Balance Sheet Location of Cumulative Basis Adjustments (Details) - Fair Value Hedges - GM Financial - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	$ 23,315	$ 20,397
Cumulative Amount of Fair Value Hedging Adjustments	(739)	(77)
Short-term Debt
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	4,858	996
Cumulative Amount of Fair Value Hedging Adjustments	(69)	4
Long-term Debt
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	18,457	19,401
Cumulative Amount of Fair Value Hedging Adjustments	(670)	$ (81)
Cumulative fair value adjustment on discontinued hedging relationships	$ 200

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- Definition

Derivative Liabilities, Fair Value Adjustment

+ References

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- Definition

Derivative Liabilities, Fair Value Adjustment on Discontinued Hedging Relationships

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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=121590274&loc=SL109999712-113959

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