CONDENSED CONSOLIDATING FINANCIAL STATEMENTS - Condensed Consolidating Statements of Income and Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Revenues
Dividends from subsidiaries		$ 0	$ 0
Interest revenue		29,395	13,151
Interest revenue—intercompany		0	0
Interest expense		16,047	2,280
Interest expense—intercompany		0	0
Net interest income		13,348	10,871
Commissions and fees		2,366	2,568
Commissions and fees—intercompany		0	0
Principal transactions		3,939	4,590
Principal transactions—intercompany		0	0
Other revenue		1,794	1,157
Other revenue—intercompany		0	0
Total non-interest revenues		8,099	8,315
Total revenues, net of interest expense		21,447	19,186
Total provisions for credit losses and for benefits and claims	[1],[2]	1,975	755
Operating expenses
Compensation and benefits		7,538	6,820
Compensation and benefits—intercompany		0	0
Other operating		5,751	6,345
Other operating—intercompany		0	0
Total operating expenses		13,289	13,165
Equity in undistributed income of subsidiaries		0	0
Income from continuing operations before income taxes		6,183	5,266
Provision (benefits) for income taxes		1,531	941
Income from continuing operations		4,652	4,325
Income (loss) from discontinued operations, net of taxes		(1)	(2)
Net income before attribution to noncontrolling interests		4,651	4,323
Noncontrolling interests		45	17
Citigroup’s net income		4,606	4,306
Comprehensive income
Add: Other comprehensive income (loss)	[3]	1,594	(4,820)
Total Citigroup comprehensive income (loss)		6,200	(514)
Add: Other comprehensive income (loss) attributable to noncontrolling interests		32	(29)
Add: Net income (loss) attributable to noncontrolling interests		45	17
Total comprehensive income (loss)		6,277	(526)
Reportable legal entities | Citigroup parent company
Revenues
Dividends from subsidiaries		3,291	250
Interest revenue		0	0
Interest revenue—intercompany		1,653	902
Interest expense		1,503	1,179
Interest expense—intercompany		326	90
Net interest income		(176)	(367)
Commissions and fees		0	0
Commissions and fees—intercompany		(14)	0
Principal transactions		(631)	1,862
Principal transactions—intercompany		327	(1,849)
Other revenue		(59)	69
Other revenue—intercompany		16	(57)
Total non-interest revenues		(361)	25
Total revenues, net of interest expense		2,754	(92)
Total provisions for credit losses and for benefits and claims		0	0
Operating expenses
Compensation and benefits		5	0
Compensation and benefits—intercompany		17	11
Other operating		33	24
Other operating—intercompany		4	3
Total operating expenses		59	38
Equity in undistributed income of subsidiaries		1,543	4,134
Income from continuing operations before income taxes		4,238	4,004
Provision (benefits) for income taxes		(368)	(302)
Income from continuing operations		4,606	4,306
Income (loss) from discontinued operations, net of taxes		0	0
Net income before attribution to noncontrolling interests		4,606	4,306
Noncontrolling interests		0	0
Citigroup’s net income		4,606	4,306
Comprehensive income
Add: Other comprehensive income (loss)		1,594	(4,820)
Total Citigroup comprehensive income (loss)		6,200	(514)
Add: Other comprehensive income (loss) attributable to noncontrolling interests		0	0
Add: Net income (loss) attributable to noncontrolling interests		0	0
Total comprehensive income (loss)		6,200	(514)
Reportable legal entities | CGMHI
Revenues
Dividends from subsidiaries		0	0
Interest revenue		6,269	762
Interest revenue—intercompany		1,587	139
Interest expense		4,777	194
Interest expense—intercompany		2,282	354
Net interest income		797	353
Commissions and fees		1,133	1,361
Commissions and fees—intercompany		47	84
Principal transactions		674	1,597
Principal transactions—intercompany		562	(88)
Other revenue		31	158
Other revenue—intercompany		(10)	(18)
Total non-interest revenues		2,437	3,094
Total revenues, net of interest expense		3,234	3,447
Total provisions for credit losses and for benefits and claims		19	(1)
Operating expenses
Compensation and benefits		1,490	1,512
Compensation and benefits—intercompany		0	0
Other operating		539	656
Other operating—intercompany		888	754
Total operating expenses		2,917	2,922
Equity in undistributed income of subsidiaries		0	0
Income from continuing operations before income taxes		298	526
Provision (benefits) for income taxes		115	(216)
Income from continuing operations		183	742
Income (loss) from discontinued operations, net of taxes		0	0
Net income before attribution to noncontrolling interests		183	742
Noncontrolling interests		0	0
Citigroup’s net income		183	742
Comprehensive income
Add: Other comprehensive income (loss)		(28)	449
Total Citigroup comprehensive income (loss)		155	1,191
Add: Other comprehensive income (loss) attributable to noncontrolling interests		0	0
Add: Net income (loss) attributable to noncontrolling interests		0	0
Total comprehensive income (loss)		155	1,191
Reportable legal entities | Other Citigroup subsidiaries and eliminations
Revenues
Dividends from subsidiaries		0	0
Interest revenue		23,126	12,389
Interest revenue—intercompany		(3,240)	(1,041)
Interest expense		9,767	907
Interest expense—intercompany		(2,608)	(444)
Net interest income		12,727	10,885
Commissions and fees		1,233	1,207
Commissions and fees—intercompany		(33)	(84)
Principal transactions		3,896	1,131
Principal transactions—intercompany		(889)	1,937
Other revenue		1,822	930
Other revenue—intercompany		(6)	75
Total non-interest revenues		6,023	5,196
Total revenues, net of interest expense		18,750	16,081
Total provisions for credit losses and for benefits and claims		1,956	756
Operating expenses
Compensation and benefits		6,043	5,308
Compensation and benefits—intercompany		(17)	(11)
Other operating		5,179	5,665
Other operating—intercompany		(892)	(757)
Total operating expenses		10,313	10,205
Equity in undistributed income of subsidiaries		0	0
Income from continuing operations before income taxes		6,481	5,120
Provision (benefits) for income taxes		1,784	1,459
Income from continuing operations		4,697	3,661
Income (loss) from discontinued operations, net of taxes		(1)	(2)
Net income before attribution to noncontrolling interests		4,696	3,659
Noncontrolling interests		45	17
Citigroup’s net income		4,651	3,642
Comprehensive income
Add: Other comprehensive income (loss)		(1,047)	(2,070)
Total Citigroup comprehensive income (loss)		3,604	1,572
Add: Other comprehensive income (loss) attributable to noncontrolling interests		32	(29)
Add: Net income (loss) attributable to noncontrolling interests		45	17
Total comprehensive income (loss)		3,681	1,560
Consolidating adjustments
Revenues
Dividends from subsidiaries		(3,291)	(250)
Interest revenue		0	0
Interest revenue—intercompany		0	0
Interest expense		0	0
Interest expense—intercompany		0	0
Net interest income		0	0
Commissions and fees		0	0
Commissions and fees—intercompany		0	0
Principal transactions		0	0
Principal transactions—intercompany		0	0
Other revenue		0	0
Other revenue—intercompany		0	0
Total non-interest revenues		0	0
Total revenues, net of interest expense		(3,291)	(250)
Total provisions for credit losses and for benefits and claims		0	0
Operating expenses
Compensation and benefits		0	0
Compensation and benefits—intercompany		0	0
Other operating		0	0
Other operating—intercompany		0	0
Total operating expenses		0	0
Equity in undistributed income of subsidiaries		(1,543)	(4,134)
Income from continuing operations before income taxes		(4,834)	(4,384)
Provision (benefits) for income taxes		0	0
Income from continuing operations		(4,834)	(4,384)
Income (loss) from discontinued operations, net of taxes		0	0
Net income before attribution to noncontrolling interests		(4,834)	(4,384)
Noncontrolling interests		0	0
Citigroup’s net income		(4,834)	(4,384)
Comprehensive income
Add: Other comprehensive income (loss)		1,075	1,621
Total Citigroup comprehensive income (loss)		(3,759)	(2,763)
Add: Other comprehensive income (loss) attributable to noncontrolling interests		0	0
Add: Net income (loss) attributable to noncontrolling interests		0	0
Total comprehensive income (loss)		$ (3,759)	$ (2,763)

[1] 2022 amounts have been revised to conform to the current-period presentation.

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

[3] See Note 18.