Consolidated Statements of Changes in Total Equity - USD ($) $ in Millions		Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings		Employee Stock Trusts	Accumulated Other Comprehensive Income (Loss)	Common Stock Held In Treasury at Cost	Common Stock Issued to Employee Stock Trusts	Non-Controlling Interests
Balance at beginning of period at Dec. 31, 2017					$ 23,545	$ 57,577		$ 2,907	$ (3,060)	$ (9,211)	$ (2,907)	$ 1,075
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award activity					(91)			(78)		734	78
Net income applicable to Morgan Stanley		$ 5,105				5,105
Preferred stock dividends		(263)				(263)	[1]
Common stock dividends	[1]					(890)
Repurchases of common stock and employee tax withholdings										(3,173)
Net income applicable to noncontrolling interests		66										66
Net change in Accumulated other comprehensive income (loss)		490							427			63
Other net increases (decreases)					0							193
Balance at end of period at Jun. 30, 2018		80,506	$ 8,520	$ 20	23,454	61,835		2,829	(3,070)	(11,650)	(2,829)	1,397
Balance at beginning of period at Mar. 31, 2018					23,260	60,009		2,907	(3,406)	(10,369)	(2,907)	1,455
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award activity					194			(78)		24	78
Net income applicable to Morgan Stanley		2,437				2,437
Preferred stock dividends		(170)				(170)	[1]
Common stock dividends	[1]					(441)
Repurchases of common stock and employee tax withholdings										(1,305)
Net income applicable to noncontrolling interests		30										30
Net change in Accumulated other comprehensive income (loss)		327							336			(9)
Other net increases (decreases)					0							(79)
Balance at end of period at Jun. 30, 2018		80,506	8,520	20	23,454	61,835		2,829	(3,070)	(11,650)	(2,829)	1,397
Balance at beginning of period at Dec. 31, 2018		81,406			23,794	64,175		2,836	(2,292)	(13,971)	(2,836)	1,160
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award activity					(350)			53		1,081	(53)
Net income applicable to Morgan Stanley		4,630				4,630
Preferred stock dividends		(263)				(263)	[1]
Common stock dividends	[1]					(1,017)
Repurchases of common stock and employee tax withholdings										(2,909)
Net income applicable to noncontrolling interests		84										84
Net change in Accumulated other comprehensive income (loss)		219							241			(22)
Other net increases (decreases)					2							(101)
Balance at end of period at Jun. 30, 2019		82,845	8,520	20	23,446	67,588		2,889	(2,051)	(15,799)	(2,889)	1,121
Balance at beginning of period at Mar. 31, 2019					23,178	66,061		3,000	(2,473)	(14,582)	(3,000)	1,168
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award activity					268			(111)		47	111
Net income applicable to Morgan Stanley		2,201				2,201
Preferred stock dividends		(170)				(170)	[1]
Common stock dividends	[1]					(504)
Repurchases of common stock and employee tax withholdings										(1,264)
Net income applicable to noncontrolling interests		45										45
Net change in Accumulated other comprehensive income (loss)		431							422			9
Other net increases (decreases)					0							(101)
Balance at end of period at Jun. 30, 2019		$ 82,845	$ 8,520	$ 20	$ 23,446	$ 67,588		$ 2,889	$ (2,051)	$ (15,799)	$ (2,889)	$ 1,121

[1] See Note 14 for information regarding dividends per share for common stock and each class of preferred stock.