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 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]          
Cumulative basis adjustments associated with hedging relationships $ 916   $ 916   $ 849
Fair value hedging adjustments     (71)   (70)
Investment Securities          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 18,291   18,291   18,029
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (1,024)   (1,024)   (979)
Amortized cost basis of the closed portfolios used in hedging relationships 17,700   17,700    
Cumulative basis adjustments associated with hedging relationships (916)   (916)    
Designated hedged items 11,100   11,100    
Interest Rate Swap          
Derivative Instruments, Gain (Loss) [Line Items]          
Designated hedged items 662   662    
Subordinated notes          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 7,134   7,134   7,175
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (365)   (365)   $ (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 88 $ 340 44 $ 926  
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 (87) (324) (45) (914)  
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 (87) (178) (109) (314)  
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 $ 87 $ 178 $ 109 $ 315