SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 8) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Variable Interest Entity
Total unconsolidated VIE assets	$ 433,524,000,000	[1]		$ 433,524,000,000	[1]		$ 475,766,000,000	[1]
Maximum exposure to unconsolidated VIEs	40,814,000,000	[2]		40,814,000,000	[2]		39,240,000,000	[2]
Citicorp
Variable Interest Entity
Total unconsolidated VIE assets	373,295,000,000	[1]		373,295,000,000	[1]		371,582,000,000	[1]
Maximum exposure to unconsolidated VIEs	38,598,000,000	[2]		38,598,000,000	[2]		35,651,000,000	[2]
Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	54,760,000,000			54,760,000,000			44,913,000,000
Maximum exposure to unconsolidated VIEs	23,138,000,000			23,138,000,000			18,853,000,000
Proceeds from new securitizations	0			500,000,000
Cash flows received on retained interest and other net cash flows	0		0	200,000,000		600,000,000
Citi Holdings
Variable Interest Entity
Total unconsolidated VIE assets	60,229,000,000	[1]		60,229,000,000	[1]		104,184,000,000	[1]
Maximum exposure to unconsolidated VIEs	2,216,000,000	[2]		2,216,000,000	[2]		3,589,000,000	[2]
Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	1,927,000,000			1,927,000,000			3,505,000,000
Maximum exposure to unconsolidated VIEs	309,000,000			309,000,000			890,000,000
Cash flows received on retained interest and other net cash flows	0		0	100,000,000		200,000,000
Commercial and other real estate | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	21,090,000,000			21,090,000,000			14,042,000,000
Maximum exposure to unconsolidated VIEs	6,922,000,000			6,922,000,000			3,902,000,000
Commercial and other real estate | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	715,000,000			715,000,000			774,000,000
Maximum exposure to unconsolidated VIEs	228,000,000			228,000,000			298,000,000
Corporate loans | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	460,000,000			460,000,000			2,221,000,000
Maximum exposure to unconsolidated VIEs	475,000,000			475,000,000			1,754,000,000
Corporate loans | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets							112,000,000
Maximum exposure to unconsolidated VIEs							96,000,000
Airplanes, ships and other assets | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	33,210,000,000			33,210,000,000			28,650,000,000
Maximum exposure to unconsolidated VIEs	15,741,000,000			15,741,000,000			13,197,000,000
Airplanes, ships and other assets | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	1,212,000,000			1,212,000,000			2,619,000,000
Maximum exposure to unconsolidated VIEs	$ 81,000,000			$ 81,000,000			$ 496,000,000

[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.