SUBSIDIARY GURANTEES - Condensed Consolidating Statements of Income and Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Income Statements
Total revenues, net of interest expense	$ 78,462	$ 75,338	$ 71,884
Total operating expenses	56,366	51,292	48,193
Provision for credit losses on loans	7,786	4,745	(3,103)
Income from continuing operations before income taxes	12,910	18,807	27,469
Provision (benefit) for income taxes	3,528	3,642	5,451
Net income	9,228	14,845	21,952
Parent Company
Condensed Income Statements
Total revenues, net of interest expense	14,079	7,105	4,522
Total operating expenses	202	121	173
Equity in undistributed income of subsidiaries	(5,572)	6,173	16,596
Income from continuing operations before income taxes	8,305	13,157	20,945
Provision (benefit) for income taxes	(923)	(1,688)	(1,007)
Net income	9,228	$ 14,845	$ 21,952
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	10,615
Total operating expenses	11,593
Provision for credit losses on loans	53
Equity in undistributed income of subsidiaries	0
Income from continuing operations before income taxes	(1,031)
Provision (benefit) for income taxes	57
Net income	$ (1,088)