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Nature of Operations and Basis of Presentation - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 48,008	$ 43,493	$ 44,317		$ 45,957	$ 48,771	$ 47,089	$ 44,638	$ 42,777
Impact of Adoption ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity					$ (660)
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member] | Impact of Adoption ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				$ (660)
GM Financial [Member] | Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member] | Impact of Adoption ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				(643)
GM Financial [Member] | Accounting Standards Update 2016-13 [Member] | Credit Losses [Member] | Impact of Adoption ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				$ (801)

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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