Consolidated Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 15,120	$ 11,179	$ 9,237
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(331)	170	3
Change in net unrealized gains (losses) on available-for-sale securities	(1,542)	1,580	1,137
Pension and other	(53)	146	(66)
Change in net debt valuation adjustment	696	(1,028)	(1,639)
Total other comprehensive income (loss)	(1,230)	868	(565)
Comprehensive income	13,890	12,047	8,672
Net income applicable to noncontrolling interests	86	183	195
Other comprehensive income (loss) applicable to noncontrolling interests	(90)	42	(69)
Comprehensive income applicable to Morgan Stanley	$ 13,894	$ 11,822	$ 8,546