SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 8) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2013
Variable Interest Entity
Total unconsolidated VIE assets	$ 453,851,000,000	[1]		$ 453,851,000,000	[1]		$ 475,766,000,000
Maximum exposure to unconsolidated VIEs	40,366,000,000	[2]		40,366,000,000	[2]		39,240,000,000	[2]
Citicorp
Variable Interest Entity
Total unconsolidated VIE assets	379,196,000,000	[1]		379,196,000,000	[1]		371,582,000,000
Maximum exposure to unconsolidated VIEs	37,602,000,000	[2]		37,602,000,000	[2]		35,651,000,000	[2]
Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	54,367,000,000			54,367,000,000			44,913,000,000
Maximum exposure to unconsolidated VIEs	22,321,000,000			22,321,000,000			18,853,000,000
Proceeds from new securitizations	0			500,000,000
Cash flows received on retained interest and other net cash flows	200,000,000		300,000,000	200,000,000		600,000,000
Citi Holdings
Variable Interest Entity
Total unconsolidated VIE assets	74,655,000,000	[1]		74,655,000,000	[1]		104,184,000,000
Maximum exposure to unconsolidated VIEs	2,764,000,000	[2]		2,764,000,000	[2]		3,589,000,000	[2]
Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	2,065,000,000			2,065,000,000			3,505,000,000
Maximum exposure to unconsolidated VIEs	367,000,000			367,000,000			890,000,000
Cash flows received on retained interest and other net cash flows	0		200,000,000	100,000,000		200,000,000
Commercial and other real estate | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	21,852,000,000			21,852,000,000			14,042,000,000
Maximum exposure to unconsolidated VIEs	6,616,000,000			6,616,000,000			3,902,000,000
Commercial and other real estate | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	774,000,000			774,000,000			774,000,000
Maximum exposure to unconsolidated VIEs	282,000,000			282,000,000			298,000,000
Corporate loans | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	2,073,000,000			2,073,000,000			2,221,000,000
Maximum exposure to unconsolidated VIEs	1,657,000,000			1,657,000,000			1,754,000,000
Corporate loans | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	0			0			112,000,000
Maximum exposure to unconsolidated VIEs	0			0			96,000,000
Airplanes, ships and other assets | Citicorp | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	30,442,000,000			30,442,000,000			28,650,000,000
Maximum exposure to unconsolidated VIEs	14,048,000,000			14,048,000,000			13,197,000,000
Airplanes, ships and other assets | Citi Holdings | Asset-based financing
Variable Interest Entity
Total unconsolidated VIE assets	1,291,000,000			1,291,000,000			2,619,000,000
Maximum exposure to unconsolidated VIEs	$ 85,000,000			$ 85,000,000			$ 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.