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, 2023
Mar. 31, 2022
Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]      
Cumulative basis adjustments associated with hedging relationships $ 689   $ 849
Fair value hedging adjustments (70)   (70)
Investment Securities      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 19,619   18,029
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (798)   (979)
Amortized cost basis of the closed portfolios used in hedging relationships 18,800    
Cumulative basis adjustments associated with hedging relationships (689)    
Designated hedged items 11,100    
Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Designated hedged items 869    
Subordinated notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 7,293   7,175
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (140)   $ (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 (182) $ 418  
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 181 (430)  
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 116 (98)  
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 $ (116) $ 98