OPERATING SEGMENTS (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022 USD ($) country	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment country wealthManagementCenter	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of business segments | segment				3
Number of countries containing operations | country		20		20
Number of wealth management centers | wealthManagementCenter				4
Segment Reporting Information [Line Items]
Net interest income		$ 11,964	$ 10,478	$ 22,835	$ 20,984
Non-interest revenue		7,674	7,275	15,989	16,436
Total revenues, net of interest expense		19,638	17,753	38,824	37,420
Operating expense		12,393	11,471	25,558	22,884
Provisions for credit losses	[1]	1,274	(1,066)	2,029	(3,121)
Income (loss) from continuing operations before taxes		5,971	7,348	11,237	17,657
Provision (benefits) for income taxes		1,182	1,155	2,123	3,487
Income (loss) from continuing operations		4,789	6,193	9,114	14,170
Identifiable assets (June 30, 2022 and December 31, 2021)		2,380,904	2,291,000	2,380,904	2,291,000	$ 2,291,413
Average loans		657,000	670,000	653,000	668,000
Average deposits		1,323,000	1,321,000	1,329,000	1,313,000
Operating Segments | ICG
Segment Reporting Information [Line Items]
Net interest income		4,520	3,760	8,304	7,493
Non-interest revenue		6,899	5,789	14,275	13,444
Total revenues, net of interest expense		11,419	9,549	22,579	20,937
Operating expense		6,434	5,829	13,157	11,761
Provisions for credit losses		(202)	(694)	769	(2,233)
Income (loss) from continuing operations before taxes		5,187	4,414	8,653	11,409
Provision (benefits) for income taxes		1,209	981	2,017	2,546
Income (loss) from continuing operations		3,978	3,433	6,636	8,863
Identifiable assets (June 30, 2022 and December 31, 2021)		1,700,000	1,613,000	1,700,000	1,613,000
Average loans		297,000	287,000	293,000	284,000
Average deposits		830,000	818,000	828,000	814,000
Operating Segments | PBWM
Segment Reporting Information [Line Items]
Net interest income		5,569	4,985	10,954	10,150
Non-interest revenue		460	713	980	1,540
Total revenues, net of interest expense		6,029	5,698	11,934	11,690
Operating expense		3,985	3,547	7,874	6,969
Provisions for credit losses		1,355	(170)	979	(727)
Income (loss) from continuing operations before taxes		689	2,321	3,081	5,448
Provision (benefits) for income taxes		136	516	668	1,223
Income (loss) from continuing operations		553	1,805	2,413	4,225
Identifiable assets (June 30, 2022 and December 31, 2021)		479,000	464,000	479,000	464,000
Average loans		317,000	304,000	315,000	304,000
Average deposits		435,000	410,000	441,000	404,000
Operating Segments | Legacy Franchises
Segment Reporting Information [Line Items]
Net interest income		1,474	1,621	2,982	3,184
Non-interest revenue		461	658	884	1,338
Total revenues, net of interest expense		1,935	2,279	3,866	4,522
Operating expense		1,814	1,788	4,107	3,540
Provisions for credit losses		121	(204)	281	(160)
Income (loss) from continuing operations before taxes		0	695	(522)	1,142
Provision (benefits) for income taxes		15	203	(122)	330
Income (loss) from continuing operations		(15)	492	(400)	812
Identifiable assets (June 30, 2022 and December 31, 2021)		108,000	125,000	108,000	125,000
Average loans		43,000	79,000	45,000	80,000
Average deposits		51,000	85,000	53,000	85,000
Corporate/Other
Segment Reporting Information [Line Items]
Net interest income		401	112	595	157
Non-interest revenue		(146)	115	(150)	114
Total revenues, net of interest expense		255	227	445	271
Operating expense		160	307	420	614
Provisions for credit losses		0	2	0	(1)
Income (loss) from continuing operations before taxes		95	(82)	25	(342)
Provision (benefits) for income taxes		(178)	(545)	(440)	(612)
Income (loss) from continuing operations		273	463	465	270
Identifiable assets (June 30, 2022 and December 31, 2021)		94,000	89,000	94,000	89,000
Average loans		0	0	0	0
Average deposits		$ 7,000	$ 8,000	$ 7,000	$ 10,000

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