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DERIVATIVES ACTIVITIES - Fair Value Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Gain (loss) on fair value hedges      
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges   $ 18 $ (80)
Other revenue      
Gain (loss) on fair value hedges      
Gain (loss) on the derivatives in designated and qualifying fair value hedges $ (365) (1,732) (1,986)
Gain (loss) on the hedged item in designated and qualifying fair value hedges 223 1,840 2,031
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 21 90 125
Net interest revenue      
Gain (loss) on fair value hedges      
Gain (loss) on the derivatives in designated and qualifying fair value hedges 794    
Gain (loss) on the hedged item in designated and qualifying fair value hedges (747)    
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges (5)    
Interest rate contracts      
Gain (loss) on fair value hedges      
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges   (31) (84)
Interest rate contracts | Other revenue      
Gain (loss) on fair value hedges      
Gain (loss) on the derivatives in designated and qualifying fair value hedges 0 (891) (753)
Gain (loss) on the hedged item in designated and qualifying fair value hedges 0 853 668
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 0 (7) (1)
Interest rate contracts | Net interest revenue      
Gain (loss) on fair value hedges      
Gain (loss) on the derivatives in designated and qualifying fair value hedges 794    
Gain (loss) on the hedged item in designated and qualifying fair value hedges (747)    
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges (5)    
Foreign exchange contracts      
Gain (loss) on fair value hedges      
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges   49 4
Cross-currency basis included in accumulated other comprehensive income (74)    
Foreign exchange contracts | Other revenue      
Gain (loss) on fair value hedges      
Gain (loss) on the derivatives in designated and qualifying fair value hedges (225) (824) (1,415)
Gain (loss) on the hedged item in designated and qualifying fair value hedges 99 969 1,573
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 14 96 154
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    
Gain (loss) on the hedged item in designated and qualifying fair value hedges 0    
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 0    
Commodity and other contract options | Other revenue      
Gain (loss) on fair value hedges      
Gain (loss) on the derivatives in designated and qualifying fair value hedges (140) (17) 182
Gain (loss) on the hedged item in designated and qualifying fair value hedges 124 18 (210)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges 7 $ 1 $ (28)
Commodity and other contract options | Net interest revenue      
Gain (loss) on fair value hedges      
Gain (loss) on the derivatives in designated and qualifying fair value hedges 0    
Gain (loss) on the hedged item in designated and qualifying fair value hedges 0    
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges $ 0