SUBSIDIARY GURANTEES - Condensed Consolidating Statements of Income and Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Income Statements
Total revenues, net of interest expense	$ 81,139	$ 78,462	$ 75,338
Total operating expenses	53,984	56,366	51,292
Provision for credit losses on loans	9,726	7,786	4,745
Income from continuing operations before income taxes	17,046	12,910	18,807
Provision (benefit) for income taxes	4,211	3,528	3,642
Net income	12,682	9,228	14,845
Parent Company
Condensed Income Statements
Total revenues, net of interest expense	2,890	14,079	7,105
Total operating expenses	274	202	121
Equity in undistributed income of subsidiaries	9,300	(5,572)	6,173
Income from continuing operations before income taxes	11,916	8,305	13,157
Provision (benefit) for income taxes	(766)	(923)	(1,688)
Net income	12,682	$ 9,228	$ 14,845
Parent Company | Reportable legal entities
Condensed Income Statements
Provision for credit losses on loans	0
CGMHI | Reportable legal entities
Condensed Income Statements
Total revenues, net of interest expense	11,461
Total operating expenses	11,025
Provision for credit losses on loans	24
Equity in undistributed income of subsidiaries	0
Income from continuing operations before income taxes	412
Provision (benefit) for income taxes	540
Net income	$ (128)