Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details)

v3.21.2
DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]          
Fair value hedging adjustments     $ 35   $ 62
Investment Securities [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost $ 17,630   17,630   6,637
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items 2   2   3
Amortized cost basis of the closed portfolios used in hedging relationships 17,200   17,200    
Designated hedged items 7,000   7,000    
Hedged Asset, Fair Value Hedge, Last-of-Layer, Cumulative Increase (Decrease) 1   1    
Subordinated notes [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Amortized Cost 4,882   4,882   6,383
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items 135   135   $ 232
Interest Rate Swap [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Designated hedged items 400   400    
Interest income available for sale securities taxable [Member] | Investment Securities [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Change in fair value for derivatives designated as fair value hedges 2 $ 0 39 $ (1)  
Interest income available for sale securities taxable [Member] | Hedged investment securities [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Change in fair value for derivatives designated as fair value hedges 0 0 (40) 1  
Interest expense subordinated notes and other long term debt [Member] | Subordinated notes [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Change in fair value for derivatives designated as fair value hedges (22) (36) (95) 159  
Interest expense subordinated notes and other long term debt [Member] | Hedged Subordinated notes [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Change in fair value for derivatives designated as fair value hedges $ 22 $ 35 $ 96 $ (160)