BUSINESS SEGMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment reporting information
Identifiable assets	$ 1,882,849	$ 1,880,382
Operating Segments | Total Citicorp and Corporate/Other
Segment reporting information
Identifiable assets	1,780,000	1,763,000
Operating Segments | Global Consumer Banking
Segment reporting information
Identifiable assets	401,000	405,000
Operating Segments | Institutional Clients Group
Segment reporting information
Identifiable assets	1,047,000	1,045,000
Operating Segments | Corporate/Other
Segment reporting information
Identifiable assets	332,000	313,000
Operating Segments | Citi Holdings
Segment reporting information
Identifiable assets	$ 103,000	$ 117,000