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, 2022
Mar. 31, 2021
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value hedging adjustments $ 12   $ 17
Investment Securities      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 18,364   17,150
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (547)   (117)
Amortized cost basis of the closed portfolios used in hedging relationships 16,500    
Cumulative basis adjustments associated with hedging relationships (478)    
Designated hedged items 8,600    
Interest Rate Swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Designated hedged items 869    
Subordinated notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Amortized Cost 3,237   1,981
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items (54)   $ 45
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 418 $ 43  
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 (430) (44)  
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 (98) (50)  
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 $ 98 $ 52