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Derivative Financial Instruments - Balance Sheet Location of Cumulative Basis Adjustments (Details) - Fair Value Hedges - Long-term Debt - GM Financial - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	$ 20,397	$ 17,923
Cumulative Amount of Fair Value Hedging Adjustments	(77)	459
Cumulative fair value adjustment on discontinued hedging relationships		$ 247
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Loss on derivative instruments	$ 569

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- Definition

Derivative Liabilities, Fair Value Adjustment

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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

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
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- Definition

Amount of liability hedged in fair value hedging relationship.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
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