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 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]          
Cumulative basis adjustments associated with hedging relationships $ 608   $ 608    
Fair value hedging adjustments     4   $ 17
Investment Securities          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 18,089   18,089   17,150
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (708)   (708)   (117)
Amortized cost basis of the closed portfolios used in hedging relationships 17,300   17,300    
Cumulative basis adjustments associated with hedging relationships (608)   (608)    
Designated hedged items 9,000   9,000    
Interest Rate Swap          
Derivative Instruments, Gain (Loss) [Line Items]          
Designated hedged items 869   869    
Subordinated notes          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 4,486   4,486   1,981
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (92)   (92)   $ 45
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 168 $ (6) 586 $ 37  
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 (160) 4 (590) (40)  
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 (38) (23) (136) (73)  
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 $ 39 $ 22 $ 137 $ 74