Consolidated Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 3,462	$ 3,033
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(173)	20
Change in net unrealized gains (losses) on available-for-sale securities	68	512
Pension and other	4	(1)
Change in net debt valuation adjustment	(563)	(15)
Net change in cash flow hedges	(28)	7
Total other comprehensive income (loss)	(692)	523
Comprehensive income	2,770	3,556
Net income applicable to noncontrolling interests	50	53
Other comprehensive income (loss) applicable to noncontrolling interests	(56)	(19)
Comprehensive income applicable to Morgan Stanley	$ 2,776	$ 3,522