GOODWILL AND INTANGIBLE ASSETS - Changes in Goodwill by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill
Balance of goodwill at beginning of period	$ 22,162	$ 22,126	$ 22,046
Foreign exchange translation	(383)	36	80
Divestitures	(480)
Balance of goodwill at end of period	21,299	22,162	22,126
Institutional Clients Group
Goodwill
Balance of goodwill at beginning of period	10,020	10,024	9,959
Foreign exchange translation	(267)	(4)	65
Divestitures	0
Balance of goodwill at end of period	9,753	10,020	10,024
Global Consumer Banking
Goodwill
Balance of goodwill at beginning of period	12,142	12,102	12,087
Foreign exchange translation	(116)	40	15
Divestitures	(480)
Balance of goodwill at end of period	$ 11,546	$ 12,142	$ 12,102