Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details)

v3.20.2
DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Asset, Fair Value Hedge, Last-of-Layer, Amount $ 3,000   $ 3,000    
Document Period End Date     Jun. 30, 2020    
Fair value hedging adjustments     $ 76   $ 93
Fair Value Hedge Liabilities 14,815   14,815   7,578
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 310   310   114
Investment Securities [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Fair Value Hedge Liabilities 7,573   7,573   0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 1   1   0
Subordinated notes [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Fair Value Hedge Liabilities 7,242   7,242   7,578
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 309   309   $ 114
Interest income available for sale securities taxable [Member] | Investment Securities [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge (1) $ 0 (1) $ 0  
Interest income available for sale securities taxable [Member] | Hedged investment securities [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge 1 0 1 0  
Interest expense subordinated notes and other long term debt [Member] | Subordinated notes [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge (5) 88 196 129  
Interest expense subordinated notes and other long term debt [Member] | Hedged Subordinated notes [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge $ (4) $ (88) $ (195) $ (129)