Stockholders' Equity and Noncontrolling Interests - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Class of Stock [Line Items]
Preferred stock shares authorized (in shares)	2,000,000,000	2,000,000,000		2,000,000,000
Common stock shares authorized (in shares)	5,000,000,000	5,000,000,000		5,000,000,000
Preferred stock shares outstanding (in shares)	0	0		0
Preferred stock shares issued (in shares)	0	0		0
Common stock shares issued (in shares)	1,500,000,000	1,500,000,000		1,500,000,000
Common stock shares outstanding (in shares)	1,500,000,000	1,500,000,000		1,500,000,000
Deemed dividends on subsidiary preferred stock		$ (952)	$ (46)
GM Cruise Holdings LLC
Class of Stock [Line Items]
Payments to acquire additional investment	$ 1,350
GM Cruise Holdings LLC
Class of Stock [Line Items]
Payments to acquire additional investment	1,350
Net income attributable to shareholders and transfers to the noncontrolling interests	2,000
Series G Preferred Stock | Microsoft, General Motors Holdings LLC and Other Investors | GM Cruise Holdings LLC
Class of Stock [Line Items]
Proceeds from sale of stock				$ 2,700
Series G Preferred Stock | General Motors Holdings LLC | GM Cruise Holdings LLC
Class of Stock [Line Items]
Proceeds from sale of stock				$ 1,000
Cruise Class A-1, Class F and Class G Preferred Shares | SoftBank | GM Cruise Holdings LLC
Class of Stock [Line Items]
Payments for repurchase of equity	$ 2,100
Cruise Preferred Shares
Class of Stock [Line Items]
Deemed dividends on subsidiary preferred stock		$ 909