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DERIVATIVES ACTIVITIES - Gains (Losses) Included in Other Revenue (Details) - Other revenue - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative gain (losses)      
Gains (losses) included in Other revenue $ (304) $ (1,078) $ 554
Interest rate contracts      
Derivative gain (losses)      
Gains (losses) included in Other revenue (54) (81) 117
Foreign exchange contracts      
Derivative gain (losses)      
Gains (losses) included in Other revenue 244 12 (39)
Credit derivatives      
Derivative gain (losses)      
Gains (losses) included in Other revenue $ (494) $ (1,009) $ 476