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CONTINGENCIES (Details)
$ in Millions
Sep. 29, 2017
USD ($)
Aug. 31, 2017
USD ($)
Aug. 18, 2017
claim
plaintiff
Sep. 30, 2017
USD ($)
Loss Contingencies [Line Items]        
Loss contingency, portion not accrued       $ 1,500
Lehman Brothers Holdings Inc. Vs. Citibank        
Loss Contingencies [Line Items]        
Settlement amount awarded from other party $ 350      
Frontpoint Asian Event Driven Fund Vs. Citibank        
Loss Contingencies [Line Items]        
Number of plaintiffs whose claims were dismissed | plaintiff     1  
Number of plaintiffs | plaintiff     2  
Loss contingency, number of claims filed | claim     1  
Libor-based Financial Instruments Antitrust Litigation        
Loss Contingencies [Line Items]        
Settlement amount awarded from other party   $ 130