Consolidated Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 9,230	$ 11,179	$ 15,120
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(20)	(337)	(331)
Change in net unrealized gains (losses) on available-for-sale securities	1,098	(4,437)	(1,542)
Pension and other	(87)	43	(53)
Change in net debt valuation adjustment	(1,290)	1,502	696
Net change in cash flow hedges	20	(4)	0
Total other comprehensive income (loss)	(279)	(3,233)	(1,230)
Comprehensive income	8,951	7,946	13,890
Net income applicable to noncontrolling interests	143	150	86
Other comprehensive income (loss) applicable to noncontrolling interests	(111)	(82)	(90)
Comprehensive income applicable to Morgan Stanley	$ 8,919	$ 7,878	$ 13,894