CONDENSED CONSOLIDATING FINANCIAL STATEMENTS OF INCOME (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidating Statements of Income:
Interest revenue	$ 18,145	$ 19,311	$ 54,886	$ 60,450
Interest expense	6,031	6,183	18,522	18,954
Net interest revenue	12,114	13,128	36,364	41,496
Commissions and fees	3,043	3,248	9,968	10,122
Principal transactions	2,103	2,085	7,886	8,563
Other income	3,571	2,277	6,961	8,049
Total non-interest revenues	8,717	7,610	24,815	26,734
Total revenues, net of interest expense	20,831	20,738	61,179	68,230
Provisions for credit losses and for benefits and claims	3,351	5,919	9,922	21,202
Compensation and benefits	6,223	6,117	19,301	18,240
Other expense	6,237	5,403	18,421	16,664
Total operating expenses	12,460	11,520	37,722	34,904
Income (loss) before taxes and equity in undistributed income of subsidiaries	5,020	3,299	13,535	12,124
Provision (benefit) for income taxes	1,278	698	3,430	2,546
Income from continuing operations	3,742	2,601	10,105	9,578
Income (loss) from discontinued operations, net of taxes	1	(374)	112	(166)
Net income before attribution of noncontrolling interests	3,743	2,227	10,217	9,412
Net income attributable to noncontrolling interests	(28)	59	106	119
Citigroup's net income	3,771	2,168	10,111	9,293
Citigroup Parent Company
Condensed Consolidating Statements of Income:
Dividends from subsidiaries	3,200	1,650	10,370	13,254
Interest revenue	50	65	155	208
Interest revenue-intercompany	827	963	2,590	2,010
Interest expense	2,006	2,138	6,164	6,489
Interest expense-intercompany	(120)	(218)	(401)	(623)
Net interest revenue	(1,009)	(892)	(3,018)	(3,648)
Principal transactions	(44)	(194)	9	(263)
Principal transactions-intercompany		(3)	1	(6)
Other income	(3,405)	(3,915)	(4,823)	(4,253)
Other income-intercompany	3,823	4,146	5,090	4,651
Total non-interest revenues	374	34	277	129
Total revenues, net of interest expense	2,565	792	7,629	9,735
Compensation and benefits	(15)	15	51	115
Compensation and benefits-intercompany	1	2	5	5
Other expense	176	50	753	255
Other expense-intercompany	100	84	302	239
Total operating expenses	262	151	1,111	614
Income (loss) before taxes and equity in undistributed income of subsidiaries	2,303	641	6,518	9,121
Provision (benefit) for income taxes	(300)	(430)	(1,633)	(1,906)
Equity in undistributed income of subsidiaries	1,168	1,097	1,960	(1,734)
Income from continuing operations	3,771	2,168	10,111	9,293
Net income before attribution of noncontrolling interests	3,771	2,168	10,111	9,293
Citigroup's net income	3,771	2,168	10,111	9,293
Citigroup Global Markets Holdings Inc. (CGMHI)
Condensed Consolidating Statements of Income:
Interest revenue	1,478	1,569	4,439	4,620
Interest revenue-intercompany	532	661	1,614	1,657
Interest expense	556	522	1,838	1,619
Interest expense-intercompany	932	892	2,505	2,219
Net interest revenue	522	816	1,710	2,439
Commissions and fees	888	1,062	3,310	3,274
Commissions and fees-intercompany	(3)	31	22	112
Principal transactions	628	2,231	2,144	8,278
Principal transactions-intercompany	(878)	(1,727)	(726)	(4,672)
Other income	188	170	669	571
Other income-intercompany	410	47	396	52
Total non-interest revenues	1,233	1,814	5,815	7,615
Total revenues, net of interest expense	1,755	2,630	7,525	10,054
Provisions for credit losses and for benefits and claims	1	(5)	7	22
Compensation and benefits	1,182	1,454	4,203	4,317
Compensation and benefits-intercompany	61	54	177	160
Other expense	731	653	2,068	2,170
Other expense-intercompany	157	141	338	82
Total operating expenses	2,131	2,302	6,786	6,729
Income (loss) before taxes and equity in undistributed income of subsidiaries	(377)	333	732	3,303
Provision (benefit) for income taxes	(121)	68	350	1,053
Income from continuing operations	(256)	265	382	2,250
Net income before attribution of noncontrolling interests	(256)	265	382	2,250
Net income attributable to noncontrolling interests	7	15	37	31
Citigroup's net income	(263)	250	345	2,219
Citigroup Funding Inc. (CFI)
Condensed Consolidating Statements of Income:
Interest revenue		8		8
Interest revenue-intercompany	661	741	1,854	2,378
Interest expense	558	508	1,595	1,774
Interest expense-intercompany	(16)	347	285	139
Net interest revenue	119	(106)	(26)	473
Principal transactions	1,534	(639)	1,997	(138)
Principal transactions-intercompany	(740)	653	(1,031)	496
Other income	(84)	114	(73)	114
Other income-intercompany	156	(58)	64	(58)
Total non-interest revenues	866	70	957	414
Total revenues, net of interest expense	985	(36)	931	887
Other expense		2	1	2
Other expense-intercompany	5	1	7	5
Total operating expenses	5	3	8	7
Income (loss) before taxes and equity in undistributed income of subsidiaries	980	(39)	923	880
Provision (benefit) for income taxes	395	(10)	324	308
Income from continuing operations	585	(29)	599	572
Net income before attribution of noncontrolling interests	585	(29)	599	572
Citigroup's net income	585	(29)	599	572
CitiFinancial Credit Company (CCC)
Condensed Consolidating Statements of Income:
Interest revenue	1,017	1,255	3,102	3,983
Interest revenue-intercompany	25	22	76	62
Interest expense	23	18	75	65
Interest expense-intercompany	343	463	1,121	1,488
Net interest revenue	676	796	1,982	2,492
Commissions and fees	2	14	5	37
Commissions and fees-intercompany	27	37	83	114
Other income	114	171	333	385
Other income-intercompany			(3)
Total non-interest revenues	143	222	418	536
Total revenues, net of interest expense	819	1,018	2,400	3,028
Provisions for credit losses and for benefits and claims	469	550	1,242	1,853
Compensation and benefits	122	121	341	405
Compensation and benefits-intercompany	29	30	89	97
Other expense	134	2,999	462	3,234
Other expense-intercompany	86	151	273	471
Total operating expenses	371	3,301	1,165	4,207
Income (loss) before taxes and equity in undistributed income of subsidiaries	(21)	(2,833)	(7)	(3,032)
Provision (benefit) for income taxes	(15)	(829)	(36)	(901)
Income from continuing operations	(6)	(2,004)	29	(2,131)
Net income before attribution of noncontrolling interests	(6)	(2,004)	29	(2,131)
Citigroup's net income	(6)	(2,004)	29	(2,131)
Associates
Condensed Consolidating Statements of Income:
Interest revenue	1,168	1,439	3,589	4,568
Interest revenue-intercompany	95	97	285	288
Interest expense	67	66	215	213
Interest expense-intercompany	317	384	961	1,024
Net interest revenue	879	1,086	2,698	3,619
Commissions and fees	22	34	65	109
Commissions and fees-intercompany	30	41	93	127
Principal transactions	(23)	2	(29)	(4)
Principal transactions-intercompany		1		(122)
Other income	117	178	374	551
Other income-intercompany	(1)	38	16	54
Total non-interest revenues	145	294	519	715
Total revenues, net of interest expense	1,024	1,380	3,217	4,334
Provisions for credit losses and for benefits and claims	516	586	1,377	2,038
Compensation and benefits	173	162	483	551
Compensation and benefits-intercompany	29	30	89	97
Other expense	166	3,032	565	3,351
Other expense-intercompany	96	160	300	500
Total operating expenses	464	3,384	1,437	4,499
Income (loss) before taxes and equity in undistributed income of subsidiaries	44	(2,590)	403	(2,203)
Provision (benefit) for income taxes	7	(747)	108	(633)
Income from continuing operations	37	(1,843)	295	(1,570)
Net income before attribution of noncontrolling interests	37	(1,843)	295	(1,570)
Citigroup's net income	37	(1,843)	295	(1,570)
Other Citigroup Subsidiaries, eliminations and income from discontinued operations
Condensed Consolidating Statements of Income:
Interest revenue	15,449	16,230	46,703	51,046
Interest revenue-intercompany	(2,115)	(2,462)	(6,343)	(6,333)
Interest expense	2,844	2,949	8,710	8,859
Interest expense-intercompany	(1,113)	(1,405)	(3,350)	(2,759)
Net interest revenue	11,603	12,224	35,000	38,613
Commissions and fees	2,133	2,152	6,593	6,739
Commissions and fees-intercompany	(27)	(72)	(115)	(239)
Principal transactions	8	685	3,765	690
Principal transactions-intercompany	1,618	1,076	1,756	4,304
Other income	6,755	5,730	10,814	11,066
Other income-intercompany	(4,388)	(4,173)	(5,566)	(4,699)
Total non-interest revenues	6,099	5,398	17,247	17,861
Total revenues, net of interest expense	17,702	17,622	52,247	56,474
Provisions for credit losses and for benefits and claims	2,834	5,338	8,538	19,142
Compensation and benefits	4,883	4,486	14,564	13,257
Compensation and benefits-intercompany	(91)	(86)	(271)	(262)
Other expense	5,164	1,666	15,034	10,886
Other expense-intercompany	(358)	(386)	(947)	(826)
Total operating expenses	9,598	5,680	28,380	23,055
Income (loss) before taxes and equity in undistributed income of subsidiaries	5,270	6,604	15,329	14,277
Provision (benefit) for income taxes	1,297	1,817	4,281	3,724
Income from continuing operations	3,973	4,787	11,048	10,553
Income (loss) from discontinued operations, net of taxes	1	(374)	112	(166)
Net income before attribution of noncontrolling interests	3,974	4,413	11,160	10,387
Net income attributable to noncontrolling interests	(35)	44	69	88
Citigroup's net income	4,009	4,369	11,091	10,299
Consolidating adjustments
Condensed Consolidating Statements of Income:
Dividends from subsidiaries	(3,200)	(1,650)	(10,370)	(13,254)
Interest revenue	(1,017)	(1,255)	(3,102)	(3,983)
Interest revenue-intercompany	(25)	(22)	(76)	(62)
Interest expense	(23)	(18)	(75)	(65)
Interest expense-intercompany	(343)	(463)	(1,121)	(1,488)
Net interest revenue	(676)	(796)	(1,982)	(2,492)
Commissions and fees	(2)	(14)	(5)	(37)
Commissions and fees-intercompany	(27)	(37)	(83)	(114)
Other income	(114)	(171)	(333)	(385)
Other income-intercompany			3
Total non-interest revenues	(143)	(222)	(418)	(536)
Total revenues, net of interest expense	(4,019)	(2,668)	(12,770)	(16,282)
Provisions for credit losses and for benefits and claims	(469)	(550)	(1,242)	(1,853)
Compensation and benefits	(122)	(121)	(341)	(405)
Compensation and benefits-intercompany	(29)	(30)	(89)	(97)
Other expense	(134)	(2,999)	(462)	(3,234)
Other expense-intercompany	(86)	(151)	(273)	(471)
Total operating expenses	(371)	(3,301)	(1,165)	(4,207)
Income (loss) before taxes and equity in undistributed income of subsidiaries	(3,179)	1,183	(10,363)	(10,222)
Provision (benefit) for income taxes	15	829	36	901
Equity in undistributed income of subsidiaries	(1,168)	(1,097)	(1,960)	1,734
Income from continuing operations	(4,362)	(743)	(12,359)	(9,389)
Net income before attribution of noncontrolling interests	(4,362)	(743)	(12,359)	(9,389)
Citigroup's net income	$ (4,362)	$ (743)	$ (12,359)	$ (9,389)