SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 3) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Variable Interest Entity
Cash	$ 35,976,000,000	$ 29,885,000,000	$ 32,810,000,000	$ 36,453,000,000
Trading account assets	290,822,000,000	285,928,000,000
Investments	333,047,000,000	308,980,000,000
Total loans, net	636,911,000,000	645,824,000,000
Other assets	127,147,000,000	125,266,000,000
Total assets	1,882,849,000,000	1,880,382,000,000
Consolidated VIEs
Variable Interest Entity
Cash	200,000,000	400,000,000
Trading account assets	800,000,000	1,000,000,000
Investments	9,900,000,000	10,900,000,000
Total loans, net	91,900,000,000	91,900,000,000
Other assets	1,000,000,000	1,300,000,000
Total assets	103,800,000,000	105,500,000,000
Short-term borrowings	24,200,000,000	24,300,000,000
Long-term debt	40,200,000,000	34,800,000,000
Other liabilities	900,000,000	1,000,000,000
Total Liabilities	65,300,000,000	60,100,000,000
Significant unconsolidated VIE assets
Variable Interest Entity
Trading account assets	4,600,000,000	5,400,000,000
Investments	2,700,000,000	4,100,000,000
Total loans, net	22,700,000,000	18,900,000,000
Other assets	2,100,000,000	2,700,000,000
Total assets	32,100,000,000	31,100,000,000
Citicorp | Consolidated VIEs
Variable Interest Entity
Cash	100,000,000	200,000,000
Trading account assets	800,000,000	1,000,000,000
Investments	9,900,000,000	10,900,000,000
Total loans, net	89,300,000,000	83,200,000,000
Other assets	700,000,000	1,100,000,000
Total assets	100,800,000,000	96,400,000,000
Short-term borrowings	24,200,000,000	24,300,000,000
Long-term debt	38,200,000,000	32,800,000,000
Other liabilities	800,000,000	900,000,000
Total Liabilities	63,200,000,000	58,000,000,000
Citicorp | Significant unconsolidated VIE assets
Variable Interest Entity
Trading account assets	4,300,000,000	4,800,000,000
Investments	2,500,000,000	3,700,000,000
Total loans, net	22,500,000,000	18,300,000,000
Other assets	1,900,000,000	2,200,000,000
Total assets	31,200,000,000	29,000,000,000
Citi Holdings | Consolidated VIEs
Variable Interest Entity
Cash	100,000,000	200,000,000
Total loans, net	2,600,000,000	8,700,000,000
Other assets	300,000,000	200,000,000
Total assets	3,000,000,000	9,100,000,000
Long-term debt	2,000,000,000	2,000,000,000
Other liabilities	100,000,000	100,000,000
Total Liabilities	2,100,000,000	2,100,000,000
Citi Holdings | Significant unconsolidated VIE assets
Variable Interest Entity
Trading account assets	300,000,000	600,000,000
Investments	200,000,000	400,000,000
Total loans, net	200,000,000	600,000,000
Other assets	200,000,000	500,000,000
Total assets	$ 900,000,000	$ 2,100,000,000