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
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Fair value hedging adjustments $ 50   $ 62  
Investment Securities [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amortized Cost 5,713     $ 6,637
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items 1     3
Amortized cost basis of the closed portfolios used in hedging relationships 5,300      
Designated hedged items 2,800      
Subordinated notes [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amortized Cost 5,538     6,383
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items 180     $ 232
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 43 $ 0    
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 (44) 0    
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 (50) 200    
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 $ 52 $ (190)