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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]          
Cumulative basis adjustments associated with hedging relationships $ 642   $ 642   $ 619
Fair value hedging adjustments     (63)   (69)
Investment Securities          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 17,535   17,535   18,241
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (732)   (732)   (698)
Amortized cost basis of the closed portfolios used in hedging relationships 16,900   16,900    
Cumulative basis adjustments associated with hedging relationships (642)   (642)    
Designated hedged items 11,000   11,000    
Interest Rate Swap          
Derivative Instruments, Gain (Loss) [Line Items]          
Designated hedged items 662   662    
Subordinated notes          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 11,750   11,750   9,909
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (274)   (274)   $ (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 (39) $ 138 32 $ (44)  
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 38 (139) (34) 42  
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 (31) (138) (159) (22)  
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 $ 31 $ 138 $ 159 $ 22