SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 8) (USD $)			3 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Asset-based financing	Jun. 30, 2011 Asset-based financing	Jun. 30, 2012 Asset-based financing	Jun. 30, 2011 Asset-based financing	Jun. 30, 2012 Citicorp	Dec. 31, 2011 Citicorp	Jun. 30, 2012 Citicorp Asset-based financing	Jun. 30, 2012 Citi Holdings	Dec. 31, 2011 Citi Holdings	Jun. 30, 2012 Citi Holdings Asset-based financing	Jun. 30, 2012 Commercial and other real estate Citicorp Asset-based financing	Jun. 30, 2012 Commercial and other real estate Citi Holdings Asset-based financing	Jun. 30, 2012 Hedge funds and equities Citicorp Asset-based financing	Jun. 30, 2012 Corporate loans Citi Holdings Asset-based financing	Jun. 30, 2012 Airplanes, ships and other assets Citicorp Asset-based financing	Jun. 30, 2012 Airplanes, ships and other assets Citi Holdings Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	$ 513,138,000,000	$ 553,237,000,000					$ 339,482,000,000	$ 348,138,000,000	$ 19,800,000,000	$ 173,656,000,000	$ 205,099,000,000	$ 7,400,000,000	$ 6,300,000,000	$ 1,500,000,000	$ 1,600,000,000	$ 3,300,000,000	$ 11,900,000,000	$ 2,600,000,000
Maximum exposure	47,726,000,000	53,422,000,000					40,859,000,000	43,748,000,000	13,200,000,000	6,867,000,000	9,674,000,000	3,600,000,000	2,100,000,000	300,000,000	1,100,000,000	2,700,000,000	10,000,000,000	600,000,000
Cash flows received on retained interest and other net cash flows			$ 400,000,000	$ 500,000,000	$ 1,300,000,000	$ 900,000,000