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BUSINESS SEGMENTS (Details 2) (USD $)
In Billions
Sep. 30, 2011
Dec. 31, 2010
Segment reporting information  
Identifiable assets$ 1,936$ 1,914
Citicorp
  
Segment reporting information  
Identifiable assets1,3641,284
Regional Consumer Banking
  
Segment reporting information  
Identifiable assets335328
Institutional Clients Group
  
Segment reporting information  
Identifiable assets1,029956
Citi Holdings
  
Segment reporting information  
Identifiable assets289359
Corporate/Other
  
Segment reporting information  
Identifiable assets$ 283$ 271