Stockholders' Equity and Noncontrolling Interests - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended				9 Months Ended
	Mar. 31, 2022	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Aug. 31, 2022	Jun. 30, 2022
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)		1,400,000,000				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
Cash dividends paid on common stock		$ 123	$ 124	$ 126	$ 130	$ 373	$ 130
Purchase of common stock		250	$ 500	$ 369	$ 1,500
Cruise Stock Incentive Awards
Class of Stock [Line Items]
Cash used to settle awards						206	327
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]
Net income attributable to shareholders and transfers to the noncontrolling interests						8,000	7,100
Common Class B
Class of Stock [Line Items]
Recorded value of vested awards		93				93		$ 60
Common Class B | Cruise Stock Incentive Awards
Class of Stock [Line Items]
Cash used to settle awards		70				206
Common Class B | GM Cruise Holdings LLC
Class of Stock [Line Items]
Amount of stock issued during period		104				278
Payments for statutory tax withholdings		$ 57				$ 156
Cruise Preferred Shares
Class of Stock [Line Items]
Decrease in equity due to preferred stock redemption							$ 820
SoftBank | Cruise Class A-1, Class F and Class G Preferred Shares | GM Cruise Holdings LLC
Class of Stock [Line Items]
Payments for repurchase of equity	$ 2,100
Common Stock Repurchase Program
Class of Stock [Line Items]
Increased capacity under common stock repurchase plan									$ 5,000
Remaining authorized repurchase amount										$ 3,300
Common stock shares repurchased during period						30,000,000	38,000,000
Purchase of common stock						$ 1,100	$ 1,500