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DERIVATIVES ACTIVITIES - Fair Value Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gain (loss) on fair value hedges        
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges   $ (29)   $ 23
Other revenue        
Gain (loss) on fair value hedges        
Gain (loss) on the derivatives in designated and qualifying fair value hedges $ 322 (637) $ 499 (1,022)
Gain (loss) on the hedged item in designated and qualifying fair value hedges (347) 628 (595) 1,119
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 34 20 58 74
Net interest revenue        
Gain (loss) on fair value hedges        
Gain (loss) on the derivatives in designated and qualifying fair value hedges (518)   360  
Gain (loss) on the hedged item in designated and qualifying fair value hedges 520   (346)  
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges (5)   (5)  
Interest rate contracts        
Gain (loss) on fair value hedges        
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges   (16)   (26)
Interest rate contracts | Other revenue        
Gain (loss) on fair value hedges        
Gain (loss) on the derivatives in designated and qualifying fair value hedges 0 (71) 0 (376)
Gain (loss) on the hedged item in designated and qualifying fair value hedges 0 47 0 343
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 0 (8) 0 (7)
Interest rate contracts | Net interest revenue        
Gain (loss) on fair value hedges        
Gain (loss) on the derivatives in designated and qualifying fair value hedges (518)   360  
Gain (loss) on the hedged item in designated and qualifying fair value hedges 520   (346)  
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges (5)   (5)  
Foreign exchange contracts        
Gain (loss) on fair value hedges        
Amount of cross currency basis included in AOCI 37   42  
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges   (13)   49
Foreign exchange contracts | Other revenue        
Gain (loss) on fair value hedges        
Gain (loss) on the derivatives in designated and qualifying fair value hedges 320 (555) 499 (637)
Gain (loss) on the hedged item in designated and qualifying fair value hedges (347) 570 (596) 766
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 33 28 56 80
Foreign exchange contracts | Net interest revenue        
Gain (loss) on fair value hedges        
Gain (loss) on the derivatives in designated and qualifying fair value hedges 0   0  
Gain (loss) on the hedged item in designated and qualifying fair value hedges 0   0  
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 0   0  
Commodity and other contracts | Other revenue        
Gain (loss) on fair value hedges        
Gain (loss) on the derivatives in designated and qualifying fair value hedges 2 (11) 0 (9)
Gain (loss) on the hedged item in designated and qualifying fair value hedges 0 11 1 10
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 1 $ 0 2 $ 1
Commodity and other contracts | Net interest revenue        
Gain (loss) on fair value hedges        
Gain (loss) on the derivatives in designated and qualifying fair value hedges 0   0  
Gain (loss) on the hedged item in designated and qualifying fair value hedges 0   0  
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges $ 0   $ 0