INVESTMENTS (Details 8) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014 MSSB	Jun. 30, 2013 MSSB	Jun. 30, 2014 Securities available-for-sale (AFS)		Jun. 30, 2013 Securities available-for-sale (AFS)		Jun. 30, 2014 Securities available-for-sale (AFS)		Jun. 30, 2013 Securities available-for-sale (AFS)		Jun. 30, 2013 Held-to-maturity Securities	Jun. 30, 2013 Held-to-maturity Securities	Jun. 30, 2013 Other assets		Jun. 30, 2013 Other assets
OTTI on Investments disclosures
Total OTTI losses recognized during the period	$ 2	$ 4	$ 2	$ 28			$ 2	[1]	$ 3	[1]	$ 2	[1]	$ 5	[1]	$ 1	$ 23
Less: Impairments recognized in AOCI	0	0	0	11												11
Net impairment losses recognized in earnings for securities that the Company does not intend to sell nor will likely be required to sell	2	4	2	17			2	[1]	3	[1]	2	[1]	5	[1]	1	12
Impairment losses recognized in earnings for securities that the Company intends to sell or more- likely-than-not will be required to sell before recovery	35	158	236	406			35	[1]	71	[1]	236	[1]	214	[1]			87	[2]	192	[2]
Net impairment losses recognized in earnings	$ 37	$ 162	$ 238	$ 423			$ 37	[1]	$ 74	[1]	$ 238	[1]	$ 219	[1]	$ 1	$ 12	$ 87	[2]	$ 192	[2]
Percentage of ownership interest held					35.00%	35.00%

[1] Includes OTTI on non-marketable equity securities.

[2] The impairment charge relates to the carrying value of Citi’s then-remaining 35% interest in the Morgan Stanley Smith Barney joint venture (MSSB), offset by the equity pickup from MSSB during the respective periods which was recorded in Other revenue.