CONDENSED CONSOLIDATING FINANCIAL STATEMENTS OF INCOME (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidating Statements of Income:
Interest revenue	$ 18,586	$ 20,356	$ 36,741	$ 41,139
Interest expense	6,438	6,429	12,491	12,771
Net interest revenue	12,148	13,927	24,250	28,368
Commissions and fees	3,557	3,229	6,925	6,874
Principal transactions	2,616	2,362	5,783	6,478
Other income	2,301	2,553	3,390	5,772
Total non-interest revenues	8,474	8,144	16,098	19,124
Total revenues, net of interest expense	20,622	22,071	40,348	47,492
Provisions for credit losses and for benefits and claims	3,387	6,665	6,571	15,283
Compensation and benefits	6,669	5,961	13,078	12,123
Other expense	6,267	5,905	12,184	11,261
Total operating expenses	12,936	11,866	25,262	23,384
Income (loss) before taxes and equity in undistributed income of subsidiaries	4,299	3,540	8,515	8,825
Provision (benefit) for income taxes	967	812	2,152	1,848
Income from continuing operations	3,332	2,728	6,363	6,977
Income (loss) from discontinued operations, net of taxes	71	(3)	111	208
Net income before attribution of noncontrolling interests	3,403	2,725	6,474	7,185
Net income attributable to noncontrolling interests	62	28	134	60
Citigroup's net income	3,341	2,697	6,340	7,125
Citigroup Parent Company
Condensed Consolidating Statements of Income:
Dividends from subsidiaries	6,645	8,827	7,170	11,604
Interest revenue	53	68	105	143
Interest revenue-intercompany	819	539	1,763	1,047
Interest expense	2,110	2,163	4,158	4,351
Interest expense-intercompany	(94)	(206)	(281)	(405)
Net interest revenue	(1,144)	(1,350)	(2,009)	(2,756)
Principal transactions	10	48	53	(69)
Principal transactions-intercompany		1	1	(3)
Other income	(1,433)	(1,357)	(1,418)	(338)
Other income-intercompany	1,442	1,330	1,267	505
Total non-interest revenues	19	22	(97)	95
Total revenues, net of interest expense	5,520	7,499	5,064	8,943
Compensation and benefits	22	(2)	66	100
Compensation and benefits-intercompany	2	1	4	3
Other expense	267	65	577	205
Other expense-intercompany	93	91	202	155
Total operating expenses	384	155	849	463
Income (loss) before taxes and equity in undistributed income of subsidiaries	5,136	7,344	4,215	8,480
Provision (benefit) for income taxes	(693)	(406)	(1,333)	(1,476)
Equity in undistributed income of subsidiaries	(2,488)	(5,053)	792	(2,831)
Income from continuing operations	3,341	2,697	6,340	7,125
Net income before attribution of noncontrolling interests	3,341	2,697	6,340	7,125
Citigroup's net income	3,341	2,697	6,340	7,125
Citigroup Global Markets Holdings Inc. (CGMHI)
Condensed Consolidating Statements of Income:
Interest revenue	1,493	1,561	2,961	3,051
Interest revenue-intercompany	540	431	1,082	996
Interest expense	731	575	1,282	1,097
Interest expense-intercompany	762	618	1,573	1,327
Net interest revenue	540	799	1,188	1,623
Commissions and fees	1,274	925	2,422	2,212
Commissions and fees-intercompany	26	23	25	81
Principal transactions	1,687	2,226	1,516	6,047
Principal transactions-intercompany	(1,071)	(1,277)	152	(2,945)
Other income	166	49	481	401
Other income-intercompany	61	(25)	(14)	5
Total non-interest revenues	2,143	1,921	4,582	5,801
Total revenues, net of interest expense	2,683	2,720	5,770	7,424
Provisions for credit losses and for benefits and claims	(4)	23	6	27
Compensation and benefits	1,562	1,367	3,021	2,863
Compensation and benefits-intercompany	59	52	116	106
Other expense	657	1,023	1,337	1,517
Other expense-intercompany	102	(257)	181	(59)
Total operating expenses	2,380	2,185	4,655	4,427
Income (loss) before taxes and equity in undistributed income of subsidiaries	307	512	1,109	2,970
Provision (benefit) for income taxes	99	165	471	985
Income from continuing operations	208	347	638	1,985
Net income before attribution of noncontrolling interests	208	347	638	1,985
Net income attributable to noncontrolling interests	19	2	30	16
Citigroup's net income	189	345	608	1,969
Citigroup Funding Inc. (CFI)
Condensed Consolidating Statements of Income:
Interest revenue-intercompany	589	813	1,193	1,637
Interest expense	503	467	1,037	1,266
Interest expense-intercompany	107	74	301	(208)
Net interest revenue	(21)	272	(145)	579
Principal transactions	229	212	463	501
Principal transactions-intercompany	(62)	116	(291)	(157)
Other income	(44)	200	11
Other income-intercompany	73	(218)	(92)
Total non-interest revenues	196	310	91	344
Total revenues, net of interest expense	175	582	(54)	923
Other expense			1
Other expense-intercompany	1	2	2	4
Total operating expenses	1	2	3	4
Income (loss) before taxes and equity in undistributed income of subsidiaries	174	580	(57)	919
Provision (benefit) for income taxes	58	199	(71)	318
Income from continuing operations	116	381	14	601
Net income before attribution of noncontrolling interests	116	381	14	601
Citigroup's net income	116	381	14	601
CitiFinancial Credit Company (CCC)
Condensed Consolidating Statements of Income:
Interest revenue	1,034	1,329	2,085	2,728
Interest revenue-intercompany	25	20	51	40
Interest expense	23	23	52	47
Interest expense-intercompany	382	508	778	1,025
Net interest revenue	654	818	1,306	1,696
Commissions and fees	1	12	3	23
Commissions and fees-intercompany	28	37	56	77
Other income	108	110	219	214
Other income-intercompany	(3)		(3)
Total non-interest revenues	134	159	275	314
Total revenues, net of interest expense	788	977	1,581	2,010
Provisions for credit losses and for benefits and claims	376	618	773	1,303
Compensation and benefits	112	158	219	284
Compensation and benefits-intercompany	30	33	60	67
Other expense	128	123	328	235
Other expense-intercompany	96	141	187	320
Total operating expenses	366	455	794	906
Income (loss) before taxes and equity in undistributed income of subsidiaries	46	(96)	14	(199)
Provision (benefit) for income taxes	7	(30)	(21)	(72)
Income from continuing operations	39	(66)	35	(127)
Net income before attribution of noncontrolling interests	39	(66)	35	(127)
Citigroup's net income	39	(66)	35	(127)
Associates
Condensed Consolidating Statements of Income:
Interest revenue	1,196	1,523	2,421	3,129
Interest revenue-intercompany	93	95	190	191
Interest expense	72	53	148	147
Interest expense-intercompany	320	332	644	640
Net interest revenue	897	1,233	1,819	2,533
Commissions and fees	20	42	43	75
Commissions and fees-intercompany	31	42	63	86
Principal transactions	(7)	(4)	(6)	(6)
Principal transactions-intercompany		(105)		(123)
Other income	118	232	257	373
Other income-intercompany	7	7	17	16
Total non-interest revenues	169	214	374	421
Total revenues, net of interest expense	1,066	1,447	2,193	2,954
Provisions for credit losses and for benefits and claims	405	702	861	1,452
Compensation and benefits	162	209	310	389
Compensation and benefits-intercompany	30	33	60	67
Other expense	161	167	399	319
Other expense-intercompany	104	153	204	340
Total operating expenses	457	562	973	1,115
Income (loss) before taxes and equity in undistributed income of subsidiaries	204	183	359	387
Provision (benefit) for income taxes	61	47	101	114
Income from continuing operations	143	136	258	273
Net income before attribution of noncontrolling interests	143	136	258	273
Citigroup's net income	143	136	258	273
Other Citigroup Subsidiaries, eliminations
Condensed Consolidating Statements of Income:
Interest revenue	15,844	17,204	31,254	34,816
Interest revenue-intercompany	(2,041)	(1,878)	(4,228)	(3,871)
Interest expense	3,022	3,171	5,866	5,910
Interest expense-intercompany	(1,095)	(818)	(2,237)	(1,354)
Net interest revenue	11,876	12,973	23,397	26,389
Commissions and fees	2,263	2,262	4,460	4,587
Commissions and fees-intercompany	(57)	(65)	(88)	(167)
Principal transactions	697	(120)	3,757	5
Principal transactions-intercompany	1,133	1,265	138	3,228
Other income	3,494	3,429	4,059	5,336
Other income-intercompany	(1,583)	(1,094)	(1,178)	(526)
Total non-interest revenues	5,947	5,677	11,148	12,463
Total revenues, net of interest expense	17,823	18,650	34,545	38,852
Provisions for credit losses and for benefits and claims	2,986	5,940	5,704	13,804
Compensation and benefits	4,923	4,387	9,681	8,771
Compensation and benefits-intercompany	(91)	(86)	(180)	(176)
Other expense	5,182	4,650	9,870	9,220
Other expense-intercompany	(300)	11	(589)	(440)
Total operating expenses	9,714	8,962	18,782	17,375
Income (loss) before taxes and equity in undistributed income of subsidiaries	5,123	3,748	10,059	7,673
Provision (benefit) for income taxes	1,442	807	2,984	1,907
Income from continuing operations	3,681	2,941	7,075	5,766
Income (loss) from discontinued operations, net of taxes	71	(3)	111	208
Net income before attribution of noncontrolling interests	3,752	2,938	7,186	5,974
Net income attributable to noncontrolling interests	43	26	104	44
Citigroup's net income	3,709	2,912	7,082	5,930
Consolidating adjustments
Condensed Consolidating Statements of Income:
Dividends from subsidiaries	(6,645)	(8,827)	(7,170)	(11,604)
Interest revenue	(1,034)	(1,329)	(2,085)	(2,728)
Interest revenue-intercompany	(25)	(20)	(51)	(40)
Interest expense	(23)	(23)	(52)	(47)
Interest expense-intercompany	(382)	(508)	(778)	(1,025)
Net interest revenue	(654)	(818)	(1,306)	(1,696)
Commissions and fees	(1)	(12)	(3)	(23)
Commissions and fees-intercompany	(28)	(37)	(56)	(77)
Other income	(108)	(110)	(219)	(214)
Other income-intercompany	3		3
Total non-interest revenues	(134)	(159)	(275)	(314)
Total revenues, net of interest expense	(7,433)	(9,804)	(8,751)	(13,614)
Provisions for credit losses and for benefits and claims	(376)	(618)	(773)	(1,303)
Compensation and benefits	(112)	(158)	(219)	(284)
Compensation and benefits-intercompany	(30)	(33)	(60)	(67)
Other expense	(128)	(123)	(328)	(235)
Other expense-intercompany	(96)	(141)	(187)	(320)
Total operating expenses	(366)	(455)	(794)	(906)
Income (loss) before taxes and equity in undistributed income of subsidiaries	(6,691)	(8,731)	(7,184)	(11,405)
Provision (benefit) for income taxes	(7)	30	21	72
Equity in undistributed income of subsidiaries	2,488	5,053	(792)	2,831
Income from continuing operations	(4,196)	(3,708)	(7,997)	(8,646)
Net income before attribution of noncontrolling interests	(4,196)	(3,708)	(7,997)	(8,646)
Citigroup's net income	$ (4,196)	$ (3,708)	$ (7,997)	$ (8,646)