Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value hedging adjustments $ 62 $ 93  
Investment Securities      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 6,637 0  
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items 3 0  
Amortized cost basis of the closed portfolios used in hedging relationships 6,200    
Designated hedged items 3,100    
Hedged Asset, Fair Value Hedge, Last-of-Layer, Cumulative Increase (Decrease) 2    
Subordinated notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 6,383 7,578  
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items 232 114  
Interest income available for sale securities taxable | Investment Securities      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value for derivatives designated as fair value hedges 6 0 $ 0
Interest income available for sale securities taxable | Hedged investment securities      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value for derivatives designated as fair value hedges 3 0 0
Interest expense subordinated notes and other long term debt | Subordinated notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value for derivatives designated as fair value hedges 113 127 112
Interest expense subordinated notes and other long term debt | Hedged Subordinated notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value for derivatives designated as fair value hedges $ (118) $ (125) $ (104)