SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
Variable Interest Entity
Total involvement with SPE assets	$ 537,413,000,000		$ 581,199,000,000
Consolidated VIE / SPE assets	103,889,000,000		105,433,000,000
Significant unconsolidated VIE assets	433,524,000,000	[1]	475,766,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	28,864,000,000	[2],[3]	27,791,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	3,326,000,000	[2],[3]	3,379,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	7,930,000,000	[2]	7,484,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	694,000,000	[2]	586,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	40,814,000,000	[2]	39,240,000,000	[2]
Citicorp
Variable Interest Entity
Total involvement with SPE assets	474,092,000,000		467,915,000,000
Consolidated VIE / SPE assets	100,797,000,000		96,333,000,000
Significant unconsolidated VIE assets	373,295,000,000	[1]	371,582,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	28,079,000,000	[2],[3]	25,944,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	3,143,000,000	[2],[3]	3,111,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	6,920,000,000	[2]	6,287,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	456,000,000	[2]	309,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	38,598,000,000	[2]	35,651,000,000	[2]
Citicorp | Credit card securitizations
Variable Interest Entity
Total involvement with SPE assets	59,448,000,000		52,229,000,000
Consolidated VIE / SPE assets	59,448,000,000		52,229,000,000
Citicorp | Mortgage-backed securities - U.S. agency-sponsored
Variable Interest Entity
Total involvement with SPE assets	232,316,000,000	[5]	239,204,000,000	[6]
Significant unconsolidated VIE assets	232,316,000,000	[1],[5]	239,204,000,000	[1],[6]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	3,196,000,000	[2],[3],[5]	3,583,000,000	[2],[4],[6]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	23,000,000	[2],[5]	36,000,000	[2],[6]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	3,219,000,000	[2],[5]	3,619,000,000	[2],[6]
Citicorp | Mortgage securitizations - Non-agency-sponsored
Variable Interest Entity
Total involvement with SPE assets	5,502,000,000	[5]	7,711,000,000	[6]
Consolidated VIE / SPE assets	349,000,000	[5]	598,000,000	[6]
Significant unconsolidated VIE assets	5,153,000,000	[1],[5]	7,113,000,000	[1],[6]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	377,000,000	[2],[3],[5]	583,000,000	[2],[4],[6]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	377,000,000	[2],[5]	583,000,000	[2],[6]
Citicorp | Citi-administered asset-backed commercial paper conduits (ABCP)
Variable Interest Entity
Total involvement with SPE assets	30,213,000,000		31,759,000,000
Consolidated VIE / SPE assets	30,213,000,000		31,759,000,000
Citicorp | Collateralized debt obligations (CDOs)
Variable Interest Entity
Total involvement with SPE assets	3,772,000,000		4,204,000,000
Significant unconsolidated VIE assets	3,772,000,000	[1]	4,204,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	62,000,000	[2],[3]	34,000,000	[2],[4]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	62,000,000	[2]	34,000,000	[2]
Citicorp | Collateralized loan obligations (CLOs)
Variable Interest Entity
Total involvement with SPE assets	17,675,000,000		16,883,000,000
Significant unconsolidated VIE assets	17,675,000,000	[1]	16,883,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	1,728,000,000	[2],[3]	1,938,000,000	[2],[4]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	1,728,000,000	[2]	1,938,000,000	[2]
Citicorp | Asset-based financing
Variable Interest Entity
Total involvement with SPE assets	56,320,000,000		45,884,000,000
Consolidated VIE / SPE assets	1,560,000,000		971,000,000
Significant unconsolidated VIE assets	54,760,000,000	[1]	44,913,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	20,582,000,000	[2],[3]	17,452,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	94,000,000	[2],[3]	74,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	2,115,000,000	[2]	1,132,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	347,000,000	[2]	195,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	23,138,000,000	[2]	18,853,000,000	[2]
Citicorp | Municipal securities tender option bond trusts (TOBs)
Variable Interest Entity
Total involvement with SPE assets	12,187,000,000		12,716,000,000
Consolidated VIE / SPE assets	6,642,000,000		7,039,000,000
Significant unconsolidated VIE assets	5,545,000,000	[1]	5,677,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	14,000,000	[2],[3]	29,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	3,626,000,000	[2]	3,881,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	3,640,000,000	[2]	3,910,000,000	[2]
Citicorp | Municipal investments
Variable Interest Entity
Total involvement with SPE assets	16,511,000,000		15,962,000,000
Consolidated VIE / SPE assets	137,000,000		223,000,000
Significant unconsolidated VIE assets	16,374,000,000	[1]	15,739,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	1,962,000,000	[2],[3]	1,846,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	2,041,000,000	[2],[3]	2,073,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	1,074,000,000	[2]	1,173,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	5,077,000,000	[2]	5,092,000,000	[2]
Citicorp | Client intermediation
Variable Interest Entity
Total involvement with SPE assets	1,749,000,000		1,778,000,000
Consolidated VIE / SPE assets	256,000,000		195,000,000
Significant unconsolidated VIE assets	1,493,000,000	[1]	1,583,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	12,000,000	[2],[3]	145,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	10,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	22,000,000	[2]	145,000,000	[2]
Citicorp | Investment funds
Variable Interest Entity
Total involvement with SPE assets	33,259,000,000	[7]	32,324,000,000	[7]
Consolidated VIE / SPE assets	1,877,000,000	[7]	3,094,000,000	[7]
Significant unconsolidated VIE assets	31,382,000,000	[1],[7]	29,230,000,000	[1],[7]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	13,000,000	[2],[3],[7]	191,000,000	[2],[4],[7]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	385,000,000	[2],[3],[7]	264,000,000	[2],[4],[7]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	74,000,000	[2],[7]	81,000,000	[2],[7]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	472,000,000	[2],[7]	536,000,000	[2],[7]
Citicorp | Trust preferred securities
Variable Interest Entity
Total involvement with SPE assets	2,646,000,000		4,822,000,000
Significant unconsolidated VIE assets	2,646,000,000	[1]	4,822,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	6,000,000	[2],[3]	51,000,000	[2],[4]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	6,000,000	[2]	51,000,000	[2]
Citicorp | Other
Variable Interest Entity
Total involvement with SPE assets	2,494,000,000		2,439,000,000
Consolidated VIE / SPE assets	315,000,000		225,000,000
Significant unconsolidated VIE assets	2,179,000,000	[1]	2,214,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	133,000,000	[2],[3]	143,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	617,000,000	[2],[3]	649,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	31,000,000	[2]	20,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	76,000,000	[2]	78,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	857,000,000	[2]	890,000,000	[2]
Citicorp | Mortgage-backed securities
Funded and Unfunded Exposure
Private label mortgage-backed securities, outstanding	14,000,000,000		16,000,000,000
Citi Holdings
Variable Interest Entity
Total involvement with SPE assets	63,321,000,000		113,284,000,000
Consolidated VIE / SPE assets	3,092,000,000		9,100,000,000
Significant unconsolidated VIE assets	60,229,000,000	[1]	104,184,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	785,000,000	[2],[3]	1,847,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	183,000,000	[2],[3]	268,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	1,010,000,000	[2]	1,197,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	238,000,000	[2]	277,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	2,216,000,000	[2]	3,589,000,000	[2]
Citi Holdings | Credit card securitizations
Variable Interest Entity
Total involvement with SPE assets	345,000,000		1,867,000,000
Consolidated VIE / SPE assets	76,000,000		1,448,000,000
Significant unconsolidated VIE assets	269,000,000	[1]	419,000,000	[1]
Citi Holdings | Mortgage-backed securities - U.S. agency-sponsored
Variable Interest Entity
Total involvement with SPE assets	36,286,000,000		73,549,000,000
Significant unconsolidated VIE assets	36,286,000,000	[1]	73,549,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	240,000,000	[2],[3]	549,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	98,000,000	[2]	77,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	338,000,000	[2]	626,000,000	[2]
Citi Holdings | Mortgage securitizations - Non-agency-sponsored
Variable Interest Entity
Total involvement with SPE assets	10,695,000,000		13,193,000,000
Consolidated VIE / SPE assets	366,000,000		1,695,000,000
Significant unconsolidated VIE assets	10,329,000,000	[1]	11,498,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	20,000,000	[2],[3]	35,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	1,000,000	[2]	2,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	21,000,000	[2]	37,000,000	[2]
Citi Holdings | Student loan securitizations
Variable Interest Entity
Total involvement with SPE assets			1,520,000,000
Consolidated VIE / SPE assets			1,520,000,000
Citi Holdings | Collateralized debt obligations (CDOs)
Variable Interest Entity
Total involvement with SPE assets	2,786,000,000		3,879,000,000
Significant unconsolidated VIE assets	2,786,000,000	[1]	3,879,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	246,000,000	[2],[3]	273,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	139,000,000	[2]	87,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	385,000,000	[2]	360,000,000	[2]
Citi Holdings | Collateralized loan obligations (CLOs)
Variable Interest Entity
Total involvement with SPE assets	1,078,000,000		2,733,000,000
Significant unconsolidated VIE assets	1,078,000,000	[1]	2,733,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	60,000,000	[2],[3]	358,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives			111,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	60,000,000	[2]	469,000,000	[2]
Citi Holdings | Asset-based financing
Variable Interest Entity
Total involvement with SPE assets	1,930,000,000		3,508,000,000
Consolidated VIE / SPE assets	3,000,000		3,000,000
Significant unconsolidated VIE assets	1,927,000,000	[1]	3,505,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	216,000,000	[2],[3]	629,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	3,000,000	[2],[3]	3,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	90,000,000	[2]	258,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	309,000,000	[2]	890,000,000	[2]
Citi Holdings | Municipal investments
Variable Interest Entity
Total involvement with SPE assets	6,957,000,000		7,304,000,000
Significant unconsolidated VIE assets	6,957,000,000	[1]	7,304,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	3,000,000	[2],[3]	3,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	180,000,000	[2],[3]	204,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	920,000,000	[2]	939,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	1,103,000,000	[2]	1,146,000,000	[2]
Citi Holdings | Investment funds
Variable Interest Entity
Total involvement with SPE assets	591,000,000		1,237,000,000
Significant unconsolidated VIE assets	591,000,000	[1]	1,237,000,000	[1]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, equity investments			61,000,000	[2],[4]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs			61,000,000	[2]
Citi Holdings | Other
Variable Interest Entity
Total involvement with SPE assets	2,653,000,000		4,494,000,000
Consolidated VIE / SPE assets	2,647,000,000		4,434,000,000
Significant unconsolidated VIE assets	$ 6,000,000	[1]	$ 60,000,000	[1]

[1] A significant unconsolidated VIE is an entity where the Company has any variable interest or continuing involvement considered to be significant, regardless of the likelihood of loss or the notional amount of exposure.

[2] The definition of maximum exposure to loss is included in the text that follows this table.

[3] Included on Citigroup’s September 30, 2014 Consolidated Balance Sheet.

[4] Included on Citigroup’s December 31, 2013 Consolidated Balance Sheet.

[5] Citicorp mortgage securitizations also include agency and non-agency (private-label) re-securitization activities. These SPEs are not consolidated. See “Re-securitizations” below for further discussion

[6] Citicorp mortgage securitizations also include agency and non-agency (private-label) re-securitization activities. These SPEs are not consolidated. See “Re-securitizations” below for further discussion.

[7] Substantially all of the unconsolidated investment funds’ assets are related to retirement funds in Mexico managed by Citi. See “Investment Funds” below for further discussion.