OPERATING SEGMENTS (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023 USD ($) country	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) country wealthManagementCenter segment		Sep. 30, 2022 USD ($)		Dec. 31, 2022 USD ($)
Segment Reporting [Abstract]
Number of operating 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		$ 13,828	$ 12,563	$ 41,076		$ 35,398
Non-interest revenue		6,311	5,945	19,946		21,934
Total revenues, net of interest expense		20,139	18,508	61,022		57,332
Operating expense		13,511	12,749	40,370		38,307
Provisions for credit losses and for benefits and claims	[1]	1,840	1,365	5,639	[2]	3,394	[2]
Income (loss) from continuing operations before taxes		4,788	4,394	15,013		15,631
Provision (benefits) for income taxes		1,203	879	3,824		3,002
Income (loss) from continuing operations		3,585	3,515	11,189		12,629
Identifiable assets (September 30, 2023 and December 31, 2022)		2,368,477		2,368,477				$ 2,416,676
Average loans		662,000	655,000	657,000		654,000
Average deposits		1,315,000	1,316,000	1,339,000		1,324,000
Operating Segments | ICG
Segment Reporting Information [Line Items]
Net interest income		5,494	4,570	16,145		12,874
Non-interest revenue		5,150	4,898	16,173		19,173
Total revenues, net of interest expense		10,644	9,468	32,318		32,047
Operating expense		7,179	6,541	21,438		19,698
Provisions for credit losses and for benefits and claims		196	86	182		855
Income (loss) from continuing operations before taxes		3,269	2,841	10,698		11,494
Provision (benefits) for income taxes		804	655	2,716		2,672
Income (loss) from continuing operations		2,465	2,186	7,982		8,822
Identifiable assets (September 30, 2023 and December 31, 2022)		1,722,000		1,722,000				1,730,000
Average loans		278,000	291,000	280,000		292,000
Average deposits		821,000	817,000	837,000		824,000
Operating Segments | PBWM
Segment Reporting Information [Line Items]
Net interest income		6,356	5,836	18,253		16,790
Non-interest revenue		422	351	1,368		1,331
Total revenues, net of interest expense		6,778	6,187	19,621		18,121
Operating expense		4,301	4,077	12,759		11,951
Provisions for credit losses and for benefits and claims		1,457	1,109	4,627		2,088
Income (loss) from continuing operations before taxes		1,020	1,001	2,235		4,082
Provision (benefits) for income taxes		217	209	449		877
Income (loss) from continuing operations		803	792	1,786		3,205
Identifiable assets (September 30, 2023 and December 31, 2022)		471,000		471,000				494,000
Average loans		347,000	325,000	340,000		318,000
Average deposits		421,000	428,000	429,000		437,000
Operating Segments | Legacy Franchises
Segment Reporting Information [Line Items]
Net interest income		1,279	1,385	3,914		4,367
Non-interest revenue		938	1,169	3,078		2,053
Total revenues, net of interest expense		2,217	2,554	6,992		6,420
Operating expense		1,794	1,845	5,324		5,952
Provisions for credit losses and for benefits and claims		188	167	833		448
Income (loss) from continuing operations before taxes		235	542	835		20
Provision (benefits) for income taxes		108	226	224		104
Income (loss) from continuing operations		127	316	611		(84)
Identifiable assets (September 30, 2023 and December 31, 2022)		80,000		80,000				97,000
Average loans		37,000	39,000	37,000		44,000
Average deposits		52,000	50,000	51,000		52,000
Corporate/Other
Segment Reporting Information [Line Items]
Net interest income		699	772	2,764		1,367
Non-interest revenue		(199)	(473)	(673)		(623)
Total revenues, net of interest expense		500	299	2,091		744
Operating expense		237	286	849		706
Provisions for credit losses and for benefits and claims		(1)	3	(3)		3
Income (loss) from continuing operations before taxes		264	10	1,245		35
Provision (benefits) for income taxes		74	(211)	435		(651)
Income (loss) from continuing operations		190	221	810		686
Identifiable assets (September 30, 2023 and December 31, 2022)		95,000		95,000				$ 96,000
Average loans		0	0	0		0
Average deposits		$ 21,000	$ 21,000	$ 22,000		$ 11,000

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

[2] 2022 amounts have been revised to conform to the current-period presentation.