CONDENSED CONSOLIDATING FINANCIAL STATEMENTS SCHEDULES (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Assets
Cash and due from banks (including segregated cash and other deposits)	$ 33,927		$ 28,701	$ 27,766		$ 27,972
Federal funds sold and resale agreements	272,664		275,849
Trading account assets	310,246		291,734
Investments	305,926		293,413
Loans, net of unearned income	654,968		647,242
Allowance for loan losses	(27,611)	(29,020)	(30,115)	(34,362)	(36,568)	(40,655)
Total loans, net	627,357		617,127
Other assets	366,331		367,054
Total assets	1,916,451		1,873,878
Liabilities and equity
Deposits	914,308		865,936
Federal funds purchased and securities loaned or sold	214,851		198,373
Trading account liabilities	128,818		126,082
Short-term borrowings	58,698		54,441
Long-term debt	288,334		323,505
Other liabilities	125,603		125,968
Total liabilities	1,730,612		1,694,305
Citigroup stockholders' equity	183,911		177,806
Noncontrolling interests	1,928		1,767
Total equity	185,839		179,573	178,645		165,789
Total liabilities and equity	1,916,451		1,873,878
Citigroup Parent Company
Assets
Cash and due from banks-intercompany	10		3
Trading account assets			7
Trading account assets-intercompany	173		92
Investments	2,491		37,477
Advances to subsidiaries	100,478		108,644
Investments in subsidiaries	197,926		194,979
Other assets	22,968		35,776
Other assets-intercompany	63,256		29,935
Total assets	387,302		406,913
Liabilities and equity
Federal funds purchased and securities loaned or sold-intercompany	185		185
Trading account liabilities-intercompany	174		96
Short-term borrowings	13		13
Long-term debt	165,180		181,702
Advances from subsidiaries	20,358		17,046
Other liabilities	6,418		19,625
Other liabilities-intercompany	11,063		10,440
Total liabilities	203,391		229,107
Citigroup stockholders' equity	183,911		177,806
Total equity	183,911		177,806
Total liabilities and equity	387,302		406,913
Citigroup Global Markets Holdings Inc. (CGMHI)
Assets
Cash and due from banks (including segregated cash and other deposits)	1,387		1,237
Cash and due from banks-intercompany	3,127		2,963
Federal funds sold and resale agreements	210,645		209,618
Federal funds sold and resale agreements-intercompany	11,109		10,981
Trading account assets	128,049		123,017
Trading account assets-intercompany	8,144		9,319
Investments	37		110
Loans, net of unearned income	198		205
Allowance for loan losses	(58)		(47)
Total loans, net	140		158
Other assets	52,886		49,207
Other assets-intercompany	32,458		42,974
Total assets	447,982		449,584
Liabilities and equity
Federal funds purchased and securities loaned or sold	170,188		149,725
Federal funds purchased and securities loaned or sold-intercompany	18,151		25,902
Trading account liabilities	77,127		72,493
Trading account liabilities-intercompany	7,306		8,530
Short-term borrowings	3,535		1,229
Short-term borrowings-intercompany	37,352		43,056
Long-term debt	5,421		6,884
Long-term debt-intercompany	53,993		59,958
Other liabilities	57,830		63,012
Other liabilities-intercompany	8,955		10,575
Total liabilities	439,858		441,364
Citigroup stockholders' equity	7,736		7,825
Noncontrolling interests	388		395
Total equity	8,124		8,220
Total liabilities and equity	447,982		449,584
Citigroup Funding Inc. (CFI)
Assets
Trading account assets			18
Trading account assets-intercompany	446		269
Loans, net of unearned income-intercompany	51,844		58,039
Total loans, net	51,844		58,039
Other assets	309		367
Other assets-intercompany	164		3,257
Total assets	52,763		61,950
Liabilities and equity
Trading account liabilities	17		298
Trading account liabilities-intercompany	48		90
Short-term borrowings	5,619		7,133
Short-term borrowings-intercompany	1,751		3,153
Long-term debt	39,859		45,081
Long-term debt-intercompany	3,108		2,971
Other liabilities	459		889
Other liabilities-intercompany	182		352
Total liabilities	51,043		59,967
Citigroup stockholders' equity	1,720		1,983
Total equity	1,720		1,983
Total liabilities and equity	52,763		61,950
CitiFinancial Credit Company (CCC)
Assets
Cash and due from banks (including segregated cash and other deposits)	137		211
Cash and due from banks-intercompany	72		161
Investments	1,486		2,177
Loans, net of unearned income	23,468		24,899
Loans, net of unearned income-intercompany	5,651		4,916
Allowance for loan losses	(2,281)		(2,299)
Total loans, net	26,838		27,516
Other assets	4,313		4,000
Other assets-intercompany	1		4
Total assets	32,847		34,069
Liabilities and equity
Short-term borrowings	250		750
Short-term borrowings-intercompany	7,901		10,243
Long-term debt	3,242		2,742
Long-term debt-intercompany	16,325		14,919
Other liabilities	1,263		1,453
Other liabilities-intercompany	195		199
Total liabilities	29,176		30,306
Citigroup stockholders' equity	3,671		3,763
Total equity	3,671		3,763
Total liabilities and equity	32,847		34,069
Associates
Assets
Cash and due from banks (including segregated cash and other deposits)	177		254
Cash and due from banks-intercompany	95		175
Trading account assets	12		12
Investments	1,557		2,250
Loans, net of unearned income	26,853		28,556
Loans, net of unearned income-intercompany	10,630		8,585
Allowance for loan losses	(2,506)		(2,547)
Total loans, net	34,977		34,594
Other assets	7,466		7,132
Other assets-intercompany	2,361		2,366
Total assets	46,645		46,783
Liabilities and equity
Short-term borrowings	581		1,100
Short-term borrowings-intercompany	24,230		10,792
Long-term debt	5,969		5,680
Long-term debt-intercompany	7,246		20,692
Other liabilities	2,403		2,483
Other liabilities-intercompany	202		52
Total liabilities	40,631		40,799
Citigroup stockholders' equity	6,014		5,984
Total equity	6,014		5,984
Total liabilities and equity	46,645		46,783
Other Citigroup Subsidiaries and eliminations
Assets
Cash and due from banks (including segregated cash and other deposits)	32,363		27,210
Cash and due from banks-intercompany	(3,232)		(3,141)
Federal funds sold and resale agreements	62,019		66,231
Federal funds sold and resale agreements-intercompany	(11,109)		(10,981)
Trading account assets	182,185		168,680
Trading account assets-intercompany	(8,763)		(9,680)
Investments	301,841		253,576
Loans, net of unearned income	627,917		618,481
Loans, net of unearned income-intercompany	(62,474)		(66,624)
Allowance for loan losses	(25,047)		(27,521)
Total loans, net	540,396		524,336
Advances to subsidiaries	(100,478)		(108,644)
Other assets	282,702		274,572
Other assets-intercompany	(98,239)		(78,532)
Total assets	1,179,685		1,103,627
Liabilities and equity
Deposits	914,308		865,936
Federal funds purchased and securities loaned or sold	44,663		48,648
Federal funds purchased and securities loaned or sold-intercompany	(18,336)		(26,087)
Trading account liabilities	51,674		53,291
Trading account liabilities-intercompany	(7,528)		(8,716)
Short-term borrowings	48,950		44,966
Short-term borrowings-intercompany	(63,333)		(57,001)
Long-term debt	71,905		84,158
Long-term debt-intercompany	(64,347)		(83,621)
Advances from subsidiaries	(20,358)		(17,046)
Other liabilities	58,493		39,959
Other liabilities-intercompany	(20,402)		(21,419)
Total liabilities	995,689		923,068
Citigroup stockholders' equity	182,456		179,187
Noncontrolling interests	1,540		1,372
Total equity	183,996		180,559
Total liabilities and equity	1,179,685		1,103,627
Consolidating adjustments
Assets
Cash and due from banks (including segregated cash and other deposits)	(137)		(211)
Cash and due from banks-intercompany	(72)		(161)
Investments	(1,486)		(2,177)
Loans, net of unearned income	(23,468)		(24,899)
Loans, net of unearned income-intercompany	(5,651)		(4,916)
Allowance for loan losses	2,281		2,299
Total loans, net	(26,838)		(27,516)
Investments in subsidiaries	(197,926)		(194,979)
Other assets	(4,313)		(4,000)
Other assets-intercompany	(1)		(4)
Total assets	(230,773)		(229,048)
Liabilities and equity
Short-term borrowings	(250)		(750)
Short-term borrowings-intercompany	(7,901)		(10,243)
Long-term debt	(3,242)		(2,742)
Long-term debt-intercompany	(16,325)		(14,919)
Other liabilities	(1,263)		(1,453)
Other liabilities-intercompany	(195)		(199)
Total liabilities	(29,176)		(30,306)
Citigroup stockholders' equity	(201,597)		(198,742)
Total equity	(201,597)		(198,742)
Total liabilities and equity	$ (230,773)		$ (229,048)