GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2014		Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Goodwill:
Goodwill written off due to impairment	$ 0
Goodwill	24,500,000,000	[1]	25,087,000,000	25,008,000,000	25,009,000,000
North America Regional Consumer Banking
Goodwill:
Goodwill	6,765,000,000	[1]
EMEA Regional Consumer Banking
Goodwill:
Goodwill	346,000,000	[1]
Asia Regional Consumer Banking
Goodwill:
Goodwill	4,987,000,000	[1]
Latin America Global Consumer Banking
Goodwill:
Goodwill	1,733,000,000	[1]
Banking
Goodwill:
Goodwill	3,786,000,000	[1]
Markets and Securities Services
Goodwill:
Goodwill	6,841,000,000	[1]
Latin America Retirement Services
Goodwill:
Goodwill	$ 42,000,000	[1]

[1] Citi Holdings—Other is excluded from the table as there is no goodwill allocated to it.