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Stockholders' Equity and Noncontrolling Interests - Preferred and Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		9 Months Ended
	Sep. 30, 2020	May 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Preferred stock shares authorized (in shares)	2,000,000,000.0		2,000,000,000.0		2,000,000,000.0
Common stock shares authorized (in shares)	5,000,000,000.0		5,000,000,000.0		5,000,000,000.0
Preferred stock shares outstanding (in shares)	0		0		0
Common stock shares issued (in shares)	1,400,000,000		1,400,000,000		1,400,000,000
Common stock shares outstanding (in shares)	1,400,000,000		1,400,000,000		1,400,000,000
Class of Stock [Line Items]
Proceeds from issuance of subsidiary preferred stock (Note 18)			$ 492	$ 463
Series F Preferred Stock [Member] | GM Cruise Holdings LLC [Member]
Class of Stock [Line Items]
Proceeds from issuance of preferred stock		$ 1,100
Investment in subsidiaries		$ 687
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Proceeds from issuance of subsidiary preferred stock (Note 18)	$ 500
Preferred stock par value (in dollars per share)	$ 0.01		$ 0.01
Preferred stock liquidation preference (in usd per share)	$ 1,000		$ 1,000
Preferred stock dividend rate	5.70%

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