Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]            
Fair value hedging adjustments     $ 48   $ 62  
Investment Securities [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Amortized Cost $ 11,960   11,960     $ 6,637
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (1)   (1)     3
Amortized cost basis of the closed portfolios used in hedging relationships 11,500   11,500      
Designated hedged items 4,800   4,800      
Subordinated notes [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Amortized Cost 4,947   4,947     6,383
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items 158   158     $ 232
Interest Rate Swap [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Designated hedged items 400   400      
Interest income available for sale securities taxable [Member] | Investment Securities [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Change in fair value for derivatives designated as fair value hedges (6) $ (1) 37 $ (1)    
Interest income available for sale securities taxable [Member] | Hedged investment securities [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Change in fair value for derivatives designated as fair value hedges 4 1 (40) 1    
Interest expense subordinated notes and other long term debt [Member] | Subordinated notes [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Change in fair value for derivatives designated as fair value hedges (23) (5) (73) 196    
Interest expense subordinated notes and other long term debt [Member] | Hedged Subordinated notes [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Change in fair value for derivatives designated as fair value hedges $ 22 $ (4) $ 74 $ (195)