SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 8) (USD $)			3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Asset-based financing	Mar. 31, 2011 Asset-based financing	Mar. 31, 2012 Citicorp	Dec. 31, 2011 Citicorp	Mar. 31, 2012 Citicorp Asset-based financing	Mar. 31, 2012 Citi Holdings	Dec. 31, 2011 Citi Holdings	Mar. 31, 2012 Citi Holdings Asset-based financing	Mar. 31, 2012 Commercial and other real estate Citicorp Asset-based financing	Mar. 31, 2012 Commercial and other real estate Citi Holdings Asset-based financing	Mar. 31, 2012 Hedge funds and equities Citicorp Asset-based financing	Mar. 31, 2012 Corporate loans Citi Holdings Asset-based financing	Mar. 31, 2012 Airplanes, ships and other assets Citicorp Asset-based financing	Mar. 31, 2012 Airplanes, ships and other assets Citi Holdings Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	$ 530,240,000,000	$ 549,644,000,000			$ 344,154,000,000	$ 347,738,000,000	$ 18,800,000,000	$ 186,086,000,000	$ 201,906,000,000	$ 7,200,000,000	$ 3,500,000,000	$ 1,700,000,000	$ 5,200,000,000	$ 3,700,000,000	$ 10,100,000,000	$ 1,800,000,000
Maximum exposure	49,000,000,000	52,034,000,000			42,208,000,000	43,338,000,000	12,800,000,000	6,792,000,000	8,696,000,000	4,000,000,000	1,400,000,000	400,000,000	2,300,000,000	3,000,000,000	9,100,000,000	600,000,000
Cash flows received on retained interest and other net cash flows			$ 900,000,000	$ 500,000,000