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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]          
Cumulative basis adjustments associated with hedging relationships $ 377   $ 377   $ 619
Fair value hedging adjustments     (60)   (69)
Investment Securities          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 17,327   17,327   18,241
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (439)   (439)   (698)
Amortized cost basis of the closed portfolios used in hedging relationships 16,700   16,700    
Cumulative basis adjustments associated with hedging relationships (377)   (377)    
Designated hedged items 11,000   11,000    
Interest Rate Swap          
Derivative Instruments, Gain (Loss) [Line Items]          
Designated hedged items 652   652    
Subordinated notes          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 11,165   11,165   9,909
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items 28   28   $ (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 (295) $ 88 (263) $ 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 293 (87) 259 (45)  
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 301 (87) 142 (109)  
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 $ (302) $ 87 $ (143) $ 109