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 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]      
Cumulative basis adjustments associated with hedging relationships $ 680   $ 619
Fair value hedging adjustments (66)   (69)
Investment Securities      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 17,967   18,241
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (770)   (698)
Amortized cost basis of the closed portfolios used in hedging relationships 17,400    
Cumulative basis adjustments associated with hedging relationships (680)    
Designated hedged items 11,000    
Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Designated hedged items 662    
Subordinated notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 12,250   9,909
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (243)   $ (115)
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 71 $ (182)  
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 (72) 181  
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 (128) 116  
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 $ 128 $ (116)