CONDENSED CONSOLIDATING FINANCIAL STATEMENTS - Condensed Consolidating Statements of Income and Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues
Dividends from subsidiaries		$ 0	$ 0	$ 0	$ 0
Interest revenue		15,630	12,463	28,781	24,997
Interest revenue—intercompany		0	0	0	0
Interest expense		3,666	1,985	5,946	4,013
Interest expense—intercompany		0	0	0	0
Net interest income		11,964	10,478	22,835	20,984
Commissions and fees		2,452	3,374	5,020	7,044
Commissions and fees—intercompany		0	0	0	0
Principal transactions		4,525	2,304	9,115	6,217
Principal transactions—intercompany		0	0	0	0
Other revenue		697	1,597	1,854	3,175
Other revenue—intercompany		0	0	0	0
Total non-interest revenues		7,674	7,275	15,989	16,436
Total revenues, net of interest expense		19,638	17,753	38,824	37,420
Total provisions for credit losses and for benefits and claims	[1]	1,274	(1,066)	2,029	(3,121)
Operating expenses
Compensation and benefits		6,472	5,982	13,292	11,983
Compensation and benefits—intercompany		0	0	0	0
Other operating		5,921	5,489	12,266	10,901
Other operating—intercompany		0	0	0	0
Total operating expenses		12,393	11,471	25,558	22,884
Equity in undistributed income of subsidiaries		0	0	0	0
Income from continuing operations before income taxes		5,971	7,348	11,237	17,657
Provision (benefits) for income taxes		1,182	1,155	2,123	3,487
Income from continuing operations		4,789	6,193	9,114	14,170
Income (loss) from discontinued operations, net of taxes		(221)	10	(223)	8
Net income before attribution to noncontrolling interests		4,568	6,203	8,891	14,178
Noncontrolling interests		21	10	38	43
Citigroup’s net income		4,547	6,193	8,853	14,135
Comprehensive income
Add: Other comprehensive income (loss)	[2]	(1,910)	(109)	(6,730)	(3,062)
Total Citigroup comprehensive income (loss)		2,637	6,084	2,123	11,073
Add: Other comprehensive income (loss) attributable to noncontrolling interests		(53)	18	(82)	(40)
Add: Net income (loss) attributable to noncontrolling interests		21	10	38	43
Total comprehensive income (loss)		2,605	6,112	2,079	11,076
Reportable legal entities | Citigroup parent company
Revenues
Dividends from subsidiaries		1,800	3,700	2,050	3,800
Interest revenue		1	0	1	0
Interest revenue—intercompany		1,031	954	1,933	1,912
Interest expense		1,298	1,209	2,477	2,421
Interest expense—intercompany		150	94	240	178
Net interest income		(416)	(349)	(783)	(687)
Commissions and fees		0	0	0	0
Commissions and fees—intercompany		(1)	(1)	(1)	(27)
Principal transactions		2,032	(892)	3,894	877
Principal transactions—intercompany		(2,110)	910	(3,959)	(968)
Other revenue		319	(4)	388	51
Other revenue—intercompany		(124)	3	(181)	(61)
Total non-interest revenues		116	16	141	(128)
Total revenues, net of interest expense		1,500	3,367	1,408	2,985
Total provisions for credit losses and for benefits and claims		0	2	0	2
Operating expenses
Compensation and benefits		(2)	0	(2)	28
Compensation and benefits—intercompany		0	24	11	48
Other operating		(12)	14	12	25
Other operating—intercompany		4	3	7	6
Total operating expenses		(10)	41	28	107
Equity in undistributed income of subsidiaries		2,632	2,567	6,766	10,740
Income from continuing operations before income taxes		4,142	5,891	8,146	13,616
Provision (benefits) for income taxes		(405)	(302)	(707)	(519)
Income from continuing operations		4,547	6,193	8,853	14,135
Income (loss) from discontinued operations, net of taxes		0	0	0	0
Net income before attribution to noncontrolling interests		4,547	6,193	8,853	14,135
Noncontrolling interests		0	0	0	0
Citigroup’s net income		4,547	6,193	8,853	14,135
Comprehensive income
Add: Other comprehensive income (loss)		(1,910)	(109)	(6,730)	(3,062)
Total Citigroup comprehensive income (loss)		2,637	6,084	2,123	11,073
Add: Other comprehensive income (loss) attributable to noncontrolling interests		0	0	0	0
Add: Net income (loss) attributable to noncontrolling interests		0	0	0	0
Total comprehensive income (loss)		2,637	6,084	2,123	11,073
Reportable legal entities | CGMHI
Revenues
Dividends from subsidiaries		0	0	0	0
Interest revenue		1,593	1,014	2,355	1,985
Interest revenue—intercompany		293	136	432	281
Interest expense		702	221	896	444
Interest expense—intercompany		682	330	1,036	659
Net interest income		502	599	855	1,163
Commissions and fees		1,228	1,836	2,589	3,997
Commissions and fees—intercompany		42	88	126	135
Principal transactions		8,213	919	9,810	6,577
Principal transactions—intercompany		(7,349)	(110)	(7,437)	(4,348)
Other revenue		106	139	264	242
Other revenue—intercompany		(17)	(8)	(35)	(28)
Total non-interest revenues		2,223	2,864	5,317	6,575
Total revenues, net of interest expense		2,725	3,463	6,172	7,738
Total provisions for credit losses and for benefits and claims		2	3	1	7
Operating expenses
Compensation and benefits		1,323	1,303	2,835	2,637
Compensation and benefits—intercompany		0	0	0	0
Other operating		890	680	1,546	1,322
Other operating—intercompany		618	808	1,372	1,488
Total operating expenses		2,831	2,791	5,753	5,447
Equity in undistributed income of subsidiaries		0	0	0	0
Income from continuing operations before income taxes		(108)	669	418	2,284
Provision (benefits) for income taxes		101	(119)	(115)	333
Income from continuing operations		(209)	788	533	1,951
Income (loss) from discontinued operations, net of taxes		0	0	0	0
Net income before attribution to noncontrolling interests		(209)	788	533	1,951
Noncontrolling interests		0	0	0	0
Citigroup’s net income		(209)	788	533	1,951
Comprehensive income
Add: Other comprehensive income (loss)		647	7	1,096	(43)
Total Citigroup comprehensive income (loss)		438	795	1,629	1,908
Add: Other comprehensive income (loss) attributable to noncontrolling interests		0	0	0	0
Add: Net income (loss) attributable to noncontrolling interests		0	0	0	0
Total comprehensive income (loss)		438	795	1,629	1,908
Reportable legal entities | Other Citigroup subsidiaries and eliminations
Revenues
Dividends from subsidiaries		0	0	0	0
Interest revenue		14,036	11,449	26,425	23,012
Interest revenue—intercompany		(1,324)	(1,090)	(2,365)	(2,193)
Interest expense		1,666	555	2,573	1,148
Interest expense—intercompany		(832)	(424)	(1,276)	(837)
Net interest income		11,878	10,228	22,763	20,508
Commissions and fees		1,224	1,538	2,431	3,047
Commissions and fees—intercompany		(41)	(87)	(125)	(108)
Principal transactions		(5,720)	2,277	(4,589)	(1,237)
Principal transactions—intercompany		9,459	(800)	11,396	5,316
Other revenue		272	1,462	1,202	2,882
Other revenue—intercompany		141	5	216	89
Total non-interest revenues		5,335	4,395	10,531	9,989
Total revenues, net of interest expense		17,213	14,623	33,294	30,497
Total provisions for credit losses and for benefits and claims		1,272	(1,071)	2,028	(3,130)
Operating expenses
Compensation and benefits		5,151	4,679	10,459	9,318
Compensation and benefits—intercompany		0	(24)	(11)	(48)
Other operating		5,043	4,795	10,708	9,554
Other operating—intercompany		(622)	(811)	(1,379)	(1,494)
Total operating expenses		9,572	8,639	19,777	17,330
Equity in undistributed income of subsidiaries		0	0	0	0
Income from continuing operations before income taxes		6,369	7,055	11,489	16,297
Provision (benefits) for income taxes		1,486	1,576	2,945	3,673
Income from continuing operations		4,883	5,479	8,544	12,624
Income (loss) from discontinued operations, net of taxes		(221)	10	(223)	8
Net income before attribution to noncontrolling interests		4,662	5,489	8,321	12,632
Noncontrolling interests		21	10	38	43
Citigroup’s net income		4,641	5,479	8,283	12,589
Comprehensive income
Add: Other comprehensive income (loss)		889	(1,966)	(5,269)	(1,429)
Total Citigroup comprehensive income (loss)		5,530	3,513	3,014	11,160
Add: Other comprehensive income (loss) attributable to noncontrolling interests		(53)	18	(82)	(40)
Add: Net income (loss) attributable to noncontrolling interests		21	10	38	43
Total comprehensive income (loss)		5,498	3,541	2,970	11,163
Consolidating adjustments
Revenues
Dividends from subsidiaries		(1,800)	(3,700)	(2,050)	(3,800)
Interest revenue		0	0	0	0
Interest revenue—intercompany		0	0	0	0
Interest expense		0	0	0	0
Interest expense—intercompany		0	0	0	0
Net interest income		0	0	0	0
Commissions and fees		0	0	0	0
Commissions and fees—intercompany		0	0	0	0
Principal transactions		0	0	0	0
Principal transactions—intercompany		0	0	0	0
Other revenue		0	0	0	0
Other revenue—intercompany		0	0	0	0
Total non-interest revenues		0	0	0	0
Total revenues, net of interest expense		(1,800)	(3,700)	(2,050)	(3,800)
Total provisions for credit losses and for benefits and claims		0	0	0	0
Operating expenses
Compensation and benefits		0	0	0	0
Compensation and benefits—intercompany		0	0	0	0
Other operating		0	0	0	0
Other operating—intercompany		0	0	0	0
Total operating expenses		0	0	0	0
Equity in undistributed income of subsidiaries		(2,632)	(2,567)	(6,766)	(10,740)
Income from continuing operations before income taxes		(4,432)	(6,267)	(8,816)	(14,540)
Provision (benefits) for income taxes		0	0	0	0
Income from continuing operations		(4,432)	(6,267)	(8,816)	(14,540)
Income (loss) from discontinued operations, net of taxes		0	0	0	0
Net income before attribution to noncontrolling interests		(4,432)	(6,267)	(8,816)	(14,540)
Noncontrolling interests		0	0	0	0
Citigroup’s net income		(4,432)	(6,267)	(8,816)	(14,540)
Comprehensive income
Add: Other comprehensive income (loss)		(1,536)	1,959	4,173	1,472
Total Citigroup comprehensive income (loss)		(5,968)	(4,308)	(4,643)	(13,068)
Add: Other comprehensive income (loss) attributable to noncontrolling interests		0	0	0	0
Add: Net income (loss) attributable to noncontrolling interests		0	0	0	0
Total comprehensive income (loss)		$ (5,968)	$ (4,308)	$ (4,643)	$ (13,068)

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

[2] See Note 17.