SUBSIDIARY GUARANTEES - Summarized Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Condensed Balance Sheet Statements
Cash	$ 25,763	$ 30,577	$ 24,902
Securities borrowed and purchased under resale agreements	337,103	365,401
Trading account assets	423,189	334,114
Other assets	102,972	103,743
Total assets	2,423,675	2,416,676
Securities loaned and sold under repurchase agreements	260,035	202,444
Trading account liabilities	170,664	170,647
Short-term borrowings	40,430	47,096
Long-term debt	274,510	271,606
Other liabilities	79,314	87,873
Liabilities	2,214,253	2,214,838
Stockholders’ equity	209,422	201,838	$ 199,626
Total liabilities and equity	2,423,675	2,416,676
Citigroup Inc.
Condensed Balance Sheet Statements
Long-term debt	163,043	166,257
Citigroup Inc. | Reportable legal entities
Condensed Balance Sheet Statements
Cash	3,016	3,015
Securities borrowed and purchased under resale agreements	0	0
Trading account assets	262	306
Advances to subsidiaries	152,188	146,843
Other assets	15,896	13,788
Total assets	394,649	384,968
Securities loaned and sold under repurchase agreements	0	0
Trading account liabilities	578	604
Short-term borrowings	0	0
Long-term debt	163,043	166,257
Advances from subsidiaries	19,579	14,562
Other liabilities	2,730	2,356
Stockholders’ equity	208,719	201,189
Total liabilities and equity	394,649	384,968
Citigroup Inc. | Reportable legal entities | Subsidiary Holding Company
Condensed Balance Sheet Statements
Investments in subsidiaries	175,277	172,721
Citigroup Inc. | Reportable legal entities | Non-Bank Subsidiaries
Condensed Balance Sheet Statements
Investments in subsidiaries	48,010	48,295
CGMHI | Reportable legal entities
Condensed Balance Sheet Statements
Cash	21,506	27,122
Securities borrowed and purchased under resale agreements	276,820	306,273
Trading account assets	271,512	209,957
Advances to subsidiaries	0	0
Other assets	171,046	163,819
Total assets	740,884	707,171
Securities loaned and sold under repurchase agreements	292,491	245,916
Trading account liabilities	114,874	115,929
Short-term borrowings	26,731	43,850
Long-term debt	186,966	172,068
Advances from subsidiaries	0	0
Other liabilities	81,446	90,570
Stockholders’ equity	38,376	38,838
Total liabilities and equity	740,884	707,171
CGMHI | Reportable legal entities | Subsidiary Holding Company
Condensed Balance Sheet Statements
Investments in subsidiaries	0	0
CGMHI | Reportable legal entities | Non-Bank Subsidiaries
Condensed Balance Sheet Statements
Investments in subsidiaries	$ 0	$ 0