Consolidated Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 3,715	$ 4,168
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(105)	(219)
Change in net unrealized gains (losses) on available-for-sale securities	(2,395)	(776)
Pension and other	5	5
Change in net debt valuation adjustment	660	137
Total other comprehensive income (loss)	(1,835)	(853)
Comprehensive income	1,880	3,315
Net income applicable to noncontrolling interests	49	48
Other comprehensive income (loss) applicable to noncontrolling interests	(35)	(61)
Comprehensive income applicable to Morgan Stanley	$ 1,866	$ 3,328