Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value hedge $ 662    
Hedged asset, fair value hedge, last-of-layer, cumulative increase (decrease) 619 $ 849  
Fair value hedging adjustments (69) (70)  
Investment Securities      
Derivative Instruments, Gain (Loss) [Line Items]      
Designated hedged items 11,000    
Amortized Cost 18,241 18,029  
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (698) (979)  
Amortized cost basis of the closed portfolios used in hedging relationships 17,600    
Hedged asset, fair value hedge, last-of-layer, cumulative increase (decrease) (619)    
Subordinated notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 9,909 7,175  
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (115) (256)  
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 (284) 875 $ 108
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 282 (862) (114)
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 141 (300) (184)
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 $ (141) $ 300 $ 187