SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 8) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Variable Interest Entity
Total unconsolidated VIE assets	$ 475,512,000,000	$ 525,459,000,000
Maximum exposure to unconsolidated VIEs	39,055,000,000	46,180,000,000
Citicorp
Variable Interest Entity
Total unconsolidated VIE assets	371,582,000,000	380,471,000,000
Maximum exposure to unconsolidated VIEs	35,651,000,000	41,853,000,000
Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	44,900,000,000	40,200,000,000
Maximum exposure to unconsolidated VIEs	18,900,000,000	17,100,000,000
Proceeds from new securitizations	500,000,000
Cash flows received on retained interest and other net cash flows	700,000,000	300,000,000
Citi Holdings
Variable Interest Entity
Total unconsolidated VIE assets	103,930,000,000	144,988,000,000
Maximum exposure to unconsolidated VIEs	3,404,000,000	4,327,000,000
Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	3,500,000,000	4,200,000,000
Maximum exposure to unconsolidated VIEs	900,000,000	1,200,000,000
Cash flows received on retained interest and other net cash flows	200,000,000	1,700,000,000	1,400,000,000
Commercial and other real estate | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	14,000,000,000	16,100,000,000
Maximum exposure to unconsolidated VIEs	3,900,000,000	3,100,000,000
Commercial and other real estate | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	800,000,000	900,000,000
Maximum exposure to unconsolidated VIEs	300,000,000	300,000,000
Corporate loans | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	2,200,000,000	2,000,000,000
Maximum exposure to unconsolidated VIEs	1,800,000,000	1,600,000,000
Corporate loans | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	100,000,000	400,000,000
Maximum exposure to unconsolidated VIEs	100,000,000	300,000,000
Hedge funds and equities | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets		600,000,000
Maximum exposure to unconsolidated VIEs		400,000,000
Airplanes, ships and other assets | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	28,700,000,000	21,500,000,000
Maximum exposure to unconsolidated VIEs	13,200,000,000	12,000,000,000
Airplanes, ships and other assets | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	2,600,000,000	2,900,000,000
Maximum exposure to unconsolidated VIEs	$ 500,000,000	$ 600,000,000