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GOODWILL AND INTANGIBLE ASSETS - Changes in Goodwill by Segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill      
Balance of goodwill at beginning of period $ 23,592 $ 25,009 $ 25,673
Foreign exchange translation and other (1,000) (1,214) (577)
Divestitures, purchase accounting adjustments and other (212) (203) (25)
Intersegment transfers in/(out) 0 0  
Impairment of goodwill (31) 0 0
Balance of goodwill at end of period 22,349 23,592 25,009
Global Consumer Banking      
Goodwill      
Balance of goodwill at beginning of period 13,217 13,985  
Foreign exchange translation and other (355) (505)  
Divestitures, purchase accounting adjustments and other (24) (86)  
Intersegment transfers in/(out) (106) (177)  
Impairment of goodwill 0    
Balance of goodwill at end of period 12,732 13,217 13,985
Institutional Clients Group      
Goodwill      
Balance of goodwill at beginning of period 10,156 10,868  
Foreign exchange translation and other (644) (711)  
Divestitures, purchase accounting adjustments and other (1) (1)  
Intersegment transfers in/(out) 34 0  
Impairment of goodwill 0    
Balance of goodwill at end of period 9,545 10,156 10,868
Citi Holdings      
Goodwill      
Balance of goodwill at beginning of period 219 156  
Foreign exchange translation and other (1) 2  
Divestitures, purchase accounting adjustments and other (187) (116)  
Intersegment transfers in/(out) 72 177  
Impairment of goodwill (31)    
Balance of goodwill at end of period $ 72 $ 219 $ 156