SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
Variable Interest Entity
Total involvement with SPE assets	$ 561,556,000,000		$ 581,199,000,000
Consolidated VIE / SPE assets	107,705,000,000		105,433,000,000
Significant unconsolidated VIE assets	453,851,000,000	[1]	475,766,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	28,691,000,000	[2],[3]	27,791,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	3,277,000,000	[2],[3]	3,379,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	7,639,000,000	[2]	7,484,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	759,000,000	[2]	586,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	40,366,000,000	[2]	39,240,000,000	[2]
Citicorp
Variable Interest Entity
Total involvement with SPE assets	483,617,000,000		467,915,000,000
Consolidated VIE / SPE assets	104,421,000,000		96,333,000,000
Significant unconsolidated VIE assets	379,196,000,000	[1]	371,582,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	27,511,000,000	[2],[3]	25,944,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	3,078,000,000	[2],[3]	3,111,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	6,611,000,000	[2]	6,287,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	402,000,000	[2]	309,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	37,602,000,000	[2]	35,651,000,000	[2]
Citicorp | Credit card securitizations
Variable Interest Entity
Total involvement with SPE assets	62,332,000,000		52,229,000,000
Consolidated VIE / SPE assets	62,332,000,000		52,229,000,000
Citicorp | U.S. government-sponsored agency guaranteed
Variable Interest Entity
Total involvement with SPE assets	241,660,000,000	[5]	239,204,000,000	[6]
Significant unconsolidated VIE assets	241,660,000,000	[1],[5]	239,204,000,000	[6]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	3,126,000,000	[2],[3],[5]	3,583,000,000	[2],[4],[6]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	26,000,000	[2],[5]	36,000,000	[2],[6]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	3,152,000,000	[2],[5]	3,619,000,000	[2],[6]
Citicorp | Non-agency-sponsored mortgages
Variable Interest Entity
Total involvement with SPE assets	6,200,000,000	[5]	7,711,000,000	[6]
Consolidated VIE / SPE assets	453,000,000	[5]	598,000,000	[6]
Significant unconsolidated VIE assets	5,747,000,000	[1],[5]	7,113,000,000	[6]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	405,000,000	[2],[3],[5]	583,000,000	[2],[4],[6]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	405,000,000	[2],[5]	583,000,000	[2],[6]
Citicorp | Citi-administered asset-backed commercial paper conduits (ABCP)
Variable Interest Entity
Total involvement with SPE assets	30,079,000,000		31,759,000,000
Consolidated VIE / SPE assets	30,079,000,000		31,759,000,000
Citicorp | Collateralized debt obligations (CDOs)
Variable Interest Entity
Total involvement with SPE assets	4,749,000,000		4,204,000,000
Significant unconsolidated VIE assets	4,749,000,000	[1]	4,204,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	31,000,000	[2],[3]	34,000,000	[2],[4]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	31,000,000	[2]	34,000,000	[2]
Citicorp | Collateralized loan obligations (CLOs)
Variable Interest Entity
Total involvement with SPE assets	12,443,000,000		16,883,000,000
Significant unconsolidated VIE assets	12,443,000,000	[1]	16,883,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	1,689,000,000	[2],[3]	1,938,000,000	[2],[4]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	1,689,000,000	[2]	1,938,000,000	[2]
Citicorp | Asset-based financing
Variable Interest Entity
Total involvement with SPE assets	55,927,000,000		45,884,000,000
Consolidated VIE / SPE assets	1,560,000,000		971,000,000
Significant unconsolidated VIE assets	54,367,000,000	[1]	44,913,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	20,209,000,000	[2],[3]	17,452,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	68,000,000	[2],[3]	74,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	1,748,000,000	[2]	1,132,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	296,000,000	[2]	195,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	22,321,000,000	[2]	18,853,000,000	[2]
Citicorp | Municipal securities tender option bond trusts (TOBs)
Variable Interest Entity
Total involvement with SPE assets	12,431,000,000		12,716,000,000
Consolidated VIE / SPE assets	6,919,000,000		7,039,000,000
Significant unconsolidated VIE assets	5,512,000,000	[1]	5,677,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	18,000,000	[2],[3]	29,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	3,602,000,000	[2]	3,881,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	3,620,000,000	[2]	3,910,000,000	[2]
Citicorp | Municipal investments
Variable Interest Entity
Total involvement with SPE assets	16,551,000,000		15,962,000,000
Consolidated VIE / SPE assets	160,000,000		223,000,000
Significant unconsolidated VIE assets	16,391,000,000	[1]	15,739,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	1,908,000,000	[2],[3]	1,846,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	1,997,000,000	[2],[3]	2,073,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	1,127,000,000	[2]	1,173,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	5,032,000,000	[2]	5,092,000,000	[2]
Citicorp | Client intermediation
Variable Interest Entity
Total involvement with SPE assets	1,933,000,000		1,778,000,000
Consolidated VIE / SPE assets	376,000,000		195,000,000
Significant unconsolidated VIE assets	1,557,000,000	[1]	1,583,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	26,000,000	[2],[3]	145,000,000	[2],[4]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	26,000,000	[2]	145,000,000	[2]
Citicorp | Investment funds
Variable Interest Entity
Total involvement with SPE assets	34,283,000,000	[7]	32,324,000,000	[7]
Consolidated VIE / SPE assets	2,208,000,000	[7]	3,094,000,000	[7]
Significant unconsolidated VIE assets	32,075,000,000	[1],[7]	29,230,000,000	[7]
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	17,000,000	[2],[3],[7]	191,000,000	[2],[4],[7]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	416,000,000	[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	507,000,000	[2],[7]	536,000,000	[2],[7]
Citicorp | Trust preferred securities
Variable Interest Entity
Total involvement with SPE assets	2,667,000,000		4,822,000,000
Significant unconsolidated VIE assets	2,667,000,000	[1]	4,822,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	7,000,000	[2],[3]	51,000,000	[2],[4]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	7,000,000	[2]	51,000,000	[2]
Citicorp | Other
Variable Interest Entity
Total involvement with SPE assets	2,362,000,000		2,439,000,000
Consolidated VIE / SPE assets	334,000,000		225,000,000
Significant unconsolidated VIE assets	2,028,000,000	[1]	2,214,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	82,000,000	[2],[3]	143,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	590,000,000	[2],[3]	649,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	60,000,000	[2]	20,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	80,000,000	[2]	78,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	812,000,000	[2]	890,000,000	[2]
Citicorp | Mortgage-backed securities
Funded and Unfunded Exposure
Private label mortgage-backed securities, outstanding	15,000,000,000		16,000,000,000
Citi Holdings
Variable Interest Entity
Total involvement with SPE assets	77,939,000,000		113,284,000,000
Consolidated VIE / SPE assets	3,284,000,000		9,100,000,000
Significant unconsolidated VIE assets	74,655,000,000	[1]	104,184,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	1,180,000,000	[2],[3]	1,847,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	199,000,000	[2],[3]	268,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	1,028,000,000	[2]	1,197,000,000	[2]
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	357,000,000	[2]	277,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	2,764,000,000	[2]	3,589,000,000	[2]
Citi Holdings | Credit card securitizations
Variable Interest Entity
Total involvement with SPE assets	1,690,000,000		1,867,000,000
Consolidated VIE / SPE assets	1,379,000,000		1,448,000,000
Significant unconsolidated VIE assets	311,000,000	[1]	419,000,000
Citi Holdings | U.S. government-sponsored agency guaranteed
Variable Interest Entity
Total involvement with SPE assets	48,184,000,000		73,549,000,000
Significant unconsolidated VIE assets	48,184,000,000	[1]	73,549,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	343,000,000	[2],[3]	549,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	107,000,000	[2]	77,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	450,000,000	[2]	626,000,000	[2]
Citi Holdings | Non-agency-sponsored mortgages
Variable Interest Entity
Total involvement with SPE assets	11,703,000,000		13,193,000,000
Consolidated VIE / SPE assets	675,000,000		1,695,000,000
Significant unconsolidated VIE assets	11,028,000,000	[1]	11,498,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	38,000,000	[2],[3]	35,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	2,000,000	[2]	2,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	40,000,000	[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	3,028,000,000		3,879,000,000
Significant unconsolidated VIE assets	3,028,000,000	[1]	3,879,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	259,000,000	[2],[3]	273,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	129,000,000	[2]	87,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	388,000,000	[2]	360,000,000	[2]
Citi Holdings | Collateralized loan obligations (CLOs)
Variable Interest Entity
Total involvement with SPE assets	2,254,000,000		2,733,000,000
Significant unconsolidated VIE assets	2,254,000,000	[1]	2,733,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	269,000,000	[2],[3]	358,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	7,000,000
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives	119,000,000	[2]	111,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	395,000,000	[2]	469,000,000	[2]
Citi Holdings | Asset-based financing
Variable Interest Entity
Total involvement with SPE assets	2,068,000,000		3,508,000,000
Consolidated VIE / SPE assets	3,000,000		3,000,000
Significant unconsolidated VIE assets	2,065,000,000	[1]	3,505,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	269,000,000	[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	95,000,000	[2]	258,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	367,000,000	[2]	890,000,000	[2]
Citi Holdings | Municipal investments
Variable Interest Entity
Total involvement with SPE assets	7,086,000,000		7,304,000,000
Significant unconsolidated VIE assets	7,086,000,000	[1]	7,304,000,000
Funded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, debt investments	2,000,000	[2],[3]	3,000,000	[2],[4]
Maximum exposure to loss in significant unconsolidated VIEs, equity investments	196,000,000	[2],[3]	204,000,000	[2],[4]
Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments	926,000,000	[2]	939,000,000	[2]
Funded and Unfunded Exposure
Maximum exposure to loss in significant unconsolidated VIEs	1,124,000,000	[2]	1,146,000,000	[2]
Citi Holdings | Investment funds
Variable Interest Entity
Total involvement with SPE assets	694,000,000		1,237,000,000
Significant unconsolidated VIE assets	694,000,000	[1]	1,237,000,000
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	1,232,000,000		4,494,000,000
Consolidated VIE / SPE assets	1,227,000,000		4,434,000,000
Significant unconsolidated VIE assets	$ 5,000,000	[1]	$ 60,000,000

[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 June 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.