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Nature of Operations and Basis of Presentation - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards (Note 1)		$ (660)
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards (Note 1)	$ 660
GM Financial [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards (Note 1)	643
GM Financial [Member] | Accounting Standards Update 2016-13 [Member] | Credit Losses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards (Note 1)	$ 801

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- Definition

Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

+ References

No definition available.

+ Details

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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

No definition available.

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