Consolidated Statement of Changes in Total Equity - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings		Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Employee Stock Trusts	Accumulated Other Comprehensive Income (Loss)	Common Stock Held in Treasury at Cost	Common Stock Issued to Employee Stock Trusts	Noncontrolling Interests
Beginning balance at Dec. 31, 2022		$ 8,750	$ 20	$ 29,339	$ 94,862		$ 0		$ 4,881	$ (6,253)	$ (26,577)	$ (4,881)	$ 1,090
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award activity				256					363		1,479	(363)
Issuance of preferred stock		0		0
Net income applicable to Morgan Stanley	$ 7,570				7,570
Preferred stock dividends	(423)				(423)	[2]
Common stock dividends	(4,001)				(4,001)	[2]
Other net increases (decreases)					(1)								(117)
Net change in Accumulated other comprehensive income (loss)	(1,094)									(949)			(145)
Repurchases of common stock and employee tax withholdings											(4,861)
Net income applicable to noncontrolling interests	119												119
Ending balance at Sep. 30, 2023	100,158	8,750	20	29,595	98,007				5,244	(7,202)	(29,959)	(5,244)	947
Beginning balance at Jun. 30, 2023		8,750	20	29,245	97,151		0		5,258	(6,300)	(28,480)	(5,258)	975
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award activity				350					(14)		77	14
Issuance of preferred stock		0		0
Net income applicable to Morgan Stanley	2,408				2,408
Preferred stock dividends	(146)				(146)	[2]
Common stock dividends	(1,404)				(1,404)	[2]
Other net increases (decreases)					(2)								(24)
Net change in Accumulated other comprehensive income (loss)	(933)									(902)			(31)
Repurchases of common stock and employee tax withholdings											(1,556)
Net income applicable to noncontrolling interests	27												27
Ending balance at Sep. 30, 2023	100,158	8,750	20	29,595	98,007				5,244	(7,202)	(29,959)	(5,244)	947
Beginning balance at Dec. 31, 2023	99,982	8,750	20	29,832	97,996		(60)		5,314	(6,421)	(31,139)	(5,314)	944
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award activity				(7)					(219)		1,629	219
Issuance of preferred stock		1,000		(5)
Net income applicable to Morgan Stanley	9,676				9,676
Preferred stock dividends	(440)				(440)	[2]
Common stock dividends	(4,259)				(4,259)	[2]
Other net increases (decreases)					(2)								(42)
Net change in Accumulated other comprehensive income (loss)	428									435			(7)
Repurchases of common stock and employee tax withholdings											(3,358)
Net income applicable to noncontrolling interests	129												129
Ending balance at Sep. 30, 2024	104,671	9,750	20	29,820	102,911				5,095	(5,986)	(32,868)	(5,095)	1,024
Beginning balance at Jun. 30, 2024		8,750	20	29,459	101,374		$ 0		5,110	(6,760)	(32,129)	(5,110)	892
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award activity				366					(15)		74	15
Issuance of preferred stock		1,000		(5)
Net income applicable to Morgan Stanley	3,188				3,188
Preferred stock dividends	(160)				(160)	[2]
Common stock dividends	(1,492)				(1,492)	[2]
Other net increases (decreases)					1								(1)
Net change in Accumulated other comprehensive income (loss)	869									774			95
Repurchases of common stock and employee tax withholdings											(813)
Net income applicable to noncontrolling interests	38												38
Ending balance at Sep. 30, 2024	$ 104,671	$ 9,750	$ 20	$ 29,820	$ 102,911				$ 5,095	$ (5,986)	$ (32,868)	$ (5,095)	$ 1,024

[1] The Firm adopted the Investments - Tax Credit Structures accounting standard update on January 1, 2024. Refer to Note 2 for further information.

[2] See Note 16 for information regarding dividends per share for each class of stock.