OPERATING SEGMENTS (Details) $ in Millions		3 Months Ended
		Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of business segments | segment		3
Segment Reporting Information [Line Items]
Net interest income		$ 10,871	$ 10,506
Non-interest revenue		8,315	9,161
Total revenues, net of interest expense		19,186	19,667
Operating expense		13,165	11,413
Provision for credit losses	[1]	755	(2,055)
Income (loss) from continuing operations before taxes		5,266	10,309
Provision (benefits) for income taxes		941	2,332
Income (loss) from continuing operations		4,325	7,977
Identifiable assets (March 31, 2022 and December 31, 2021)		2,394,105	2,291,000	$ 2,291,413
Average loans		649,000	666,000
Average deposits		1,334,000	1,304,000
Operating Segments | ICG
Segment Reporting Information [Line Items]
Net interest income		3,784	3,733
Non-interest revenue		7,376	7,655
Total revenues, net of interest expense		11,160	11,388
Operating expense		6,723	5,932
Provision for credit losses		971	(1,539)
Income (loss) from continuing operations before taxes		3,466	6,995
Provision (benefits) for income taxes		808	1,565
Income (loss) from continuing operations		2,658	5,430
Identifiable assets (March 31, 2022 and December 31, 2021)		1,704,000	1,613,000
Average loans		289,000	281,000
Average deposits		826,000	809,000
Operating Segments | PBWM
Segment Reporting Information [Line Items]
Net interest income		5,385	5,165
Non-interest revenue		520	827
Total revenues, net of interest expense		5,905	5,992
Operating expense		3,889	3,422
Provision for credit losses		(376)	(557)
Income (loss) from continuing operations before taxes		2,392	3,127
Provision (benefits) for income taxes		532	707
Income (loss) from continuing operations		1,860	2,420
Identifiable assets (March 31, 2022 and December 31, 2021)		476,000	464,000
Average loans		312,000	303,000
Average deposits		447,000	397,000
Operating Segments | Legacy Franchises
Segment Reporting Information [Line Items]
Net interest income		1,508	1,563
Non-interest revenue		423	680
Total revenues, net of interest expense		1,931	2,243
Operating expense		2,293	1,752
Provision for credit losses		160	44
Income (loss) from continuing operations before taxes		(522)	447
Provision (benefits) for income taxes		(137)	127
Income (loss) from continuing operations		(385)	320
Identifiable assets (March 31, 2022 and December 31, 2021)		122,000	125,000
Average loans		48,000	82,000
Average deposits		55,000	87,000
Corporate/Other
Segment Reporting Information [Line Items]
Net interest income		194	45
Non-interest revenue		(4)	(1)
Total revenues, net of interest expense		190	44
Operating expense		260	307
Provision for credit losses		0	(3)
Income (loss) from continuing operations before taxes		(70)	(260)
Provision (benefits) for income taxes		(262)	(67)
Income (loss) from continuing operations		192	(193)
Identifiable assets (March 31, 2022 and December 31, 2021)		92,000	89,000
Average loans		0	0
Average deposits		$ 6,000	$ 11,000

[1] This total excludes the provision for credit losses on AFS securities, which is disclosed separately above.