CONDENSED CONSOLIDATING FINANCIAL STATEMENTS SCHEDULES (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and due from banks (including segregated cash and other deposits)	$ 33,802		$ 28,701	$ 28,950		$ 27,972
Federal funds sold and resale agreements	277,542		275,849
Trading account assets	315,201		291,734
Investments	295,474		293,413
Loans, net of unearned income	658,423		647,242
Allowance for loan losses	(25,916)	(27,611)	(30,115)	(32,052)	(34,362)	(40,655)
Total loans, net	632,507		617,127
Other assets	376,776		367,054
Assets of discontinued operations held for sale	44
Total assets	1,931,346		1,873,878
Liabilities and equity
Deposits	944,644		865,936
Federal funds purchased and securities loaned or sold	224,370		198,373
Trading account liabilities	129,990		126,082
Short-term borrowings	49,164		54,441
Long-term debt	271,862		323,505
Other liabilities	122,578		125,968
Liabilities of discontinued operations held for sale	0
Total liabilities	1,742,608		1,694,305
Citigroup stockholders' equity	186,777		177,806
Noncontrolling interests	1,961		1,767
Total equity	188,738		179,573	179,342		165,789
Total liabilities and equity	1,931,346		1,873,878
Citigroup Parent Company
Assets
Cash and due from banks-intercompany	37		3
Trading account assets			7
Trading account assets-intercompany	54		92
Investments	1,788		37,477
Advances to subsidiaries	92,434		108,644
Investments in subsidiaries	197,879		194,979
Other assets	23,037		35,776
Other assets-intercompany	61,684		29,935
Total assets	376,913		406,913
Liabilities and equity
Federal funds purchased and securities loaned or sold-intercompany	185		185
Trading account liabilities-intercompany	47		96
Short-term borrowings	16		13
Long-term debt	154,333		181,702
Advances from subsidiaries	19,119		17,046
Other liabilities	5,512		19,625
Other liabilities-intercompany	10,924		10,440
Liabilities of discontinued operations held for sale	0
Total liabilities	190,136		229,107
Citigroup stockholders' equity	186,777		177,806
Total equity	186,777		177,806
Total liabilities and equity	376,913		406,913
Citigroup Funding Inc. (CFI)
Assets
Cash and due from banks (including segregated cash and other deposits)	51
Cash and due from banks-intercompany	25
Trading account assets	12		18
Trading account assets-intercompany	140		269
Loans, net of unearned income-intercompany	44,732		58,039
Total loans, net	44,732		58,039
Other assets	81		367
Other assets-intercompany	163		3,257
Total assets	45,204		61,950
Liabilities and equity
Trading account liabilities			298
Trading account liabilities-intercompany	138		90
Short-term borrowings	866		7,133
Short-term borrowings-intercompany	209		3,153
Long-term debt	37,461		45,081
Long-term debt-intercompany	4,767		2,971
Other liabilities	272		889
Other liabilities-intercompany	43		352
Liabilities of discontinued operations held for sale	0
Total liabilities	43,756		59,967
Citigroup stockholders' equity	1,448		1,983
Total equity	1,448		1,983
Total liabilities and equity	45,204		61,950
Other Citigroup Subsidiaries and eliminations
Assets
Cash and due from banks (including segregated cash and other deposits)	33,751		28,701
Cash and due from banks-intercompany	(62)		(3)
Federal funds sold and resale agreements	277,542		275,849
Trading account assets	315,189		291,709
Trading account assets-intercompany	(194)		(361)
Investments	293,686		255,936
Loans, net of unearned income	658,423		647,242
Loans, net of unearned income-intercompany	(44,732)		(58,039)
Allowance for loan losses	(25,916)		(30,115)
Total loans, net	587,775		559,088
Advances to subsidiaries	(92,434)		(108,644)
Investments in subsidiaries	(197,879)		194,979
Other assets	353,658		330,911
Other assets-intercompany	(61,847)		(33,192)
Assets of discontinued operations held for sale	44
Total assets	1,509,229		1,405,015
Liabilities and equity
Deposits	944,644		865,936
Federal funds purchased and securities loaned or sold	224,370		198,373
Federal funds purchased and securities loaned or sold-intercompany	(185)		(185)
Trading account liabilities	129,990		125,784
Trading account liabilities-intercompany	(185)		(186)
Short-term borrowings	48,282		47,295
Short-term borrowings-intercompany	(209)		(3,153)
Long-term debt	80,068		96,722
Long-term debt-intercompany	(4,767)		(2,971)
Advances from subsidiaries	(19,119)		(17,046)
Other liabilities	116,794		105,454
Other liabilities-intercompany	(10,967)		(10,792)
Liabilities of discontinued operations held for sale	0
Total liabilities	1,508,716		1,405,231
Citigroup stockholders' equity	(1,448)		(1,983)
Noncontrolling interests	1,961		1,767
Total equity	513		(216)
Total liabilities and equity	$ 1,509,229		$ 1,405,015