Quarterly report [Sections 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
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]          
Fair value hedging adjustments $ (49)   $ (49)   $ (56)
Investment Securities          
Derivative Instruments, Gain (Loss) [Line Items]          
Designated hedged items 9,100   9,100    
Amortized Cost 15,981   15,981   16,390
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (197)   (197)   (458)
Subordinated notes          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 11,036   11,036   11,589
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (9)   (9)   $ (223)
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 (140) $ (39) (262) $ 32  
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 138 38 261 (34)  
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 72 (31) 215 (159)  
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 $ (72) $ 31 $ (215) $ 159