GOODWILL AND INTANGIBLE ASSETS - Changes in Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Jun. 30, 2021
Goodwill
Balance of goodwill at beginning of period	$ 19,865	$ 21,299	$ 21,299
Impairment		(535)	(535)	$ 0
Divestiture		(873)
Foreign currency translation	(268)	(26)
Balance of goodwill at end of period	19,597	19,865	19,597
Goodwill impairment		535	535	$ 0
Institutional Clients Group
Goodwill
Balance of goodwill at beginning of period	9,171	9,215	9,215
Impairment		0
Divestiture		0
Foreign currency translation	(223)	(44)
Balance of goodwill at end of period	8,948	9,171	8,948
Goodwill impairment		0
Personal Banking and Wealth Management
Goodwill
Balance of goodwill at beginning of period	9,735	9,717	9,717
Impairment		0
Divestiture		0
Foreign currency translation	(20)	18
Balance of goodwill at end of period	9,715	9,735	9,715
Goodwill impairment		0
Legacy Franchises
Goodwill
Balance of goodwill at beginning of period	959	2,367	2,367
Impairment		(535)
Divestiture		(873)
Foreign currency translation	(25)	0
Balance of goodwill at end of period	$ 934	959	$ 934
Goodwill impairment		535
Goodwill impairment loss, after-tax		$ 489