Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)

v3.21.2
DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
group
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Derivative [Line Items]            
Increase (decrease) to net interest income due to derivative adjustment $ 5 $ 52 $ 230 $ 68    
Fair value hedging adjustments     (48)   $ (62)  
Derivative, Notional Amount 21,923   21,923     $ 33,327
Credit risks from interest rate swaps used for trading purposes 853   853     882
Derivative Liability 173   $ 173     116
Number of primary groups | group     2      
Aggregate credit risk, net of collateral 99   $ 99     175
Investment securities and cash collateral pledged by Huntington 458   458      
Investment securities and cash collateral pledged to Huntington 303   303      
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness (39) $ 11 (73) $ 319    
Loans Payable [Member]            
Derivative [Line Items]            
Derivative, Notional Amount 11,921   11,921     18,646
Derivative used in trading activity            
Derivative [Line Items]            
Net derivative asset (liability) 74   74     70
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 51,000   51,000     37,000
Derivative used in Mortgage Banking Activities            
Derivative [Line Items]            
Derivative, Notional Amount 1,193   1,193     1,170
Derivative, Fair Value, Net 21   21     26
Foreign Exchange Forward            
Derivative [Line Items]            
Derivative, Notional Amount 220   220      
Fair Value Hedging | Designated as Hedging Instrument [Member]            
Derivative [Line Items]            
Derivative, Notional Amount 10,002   10,002     9,681
Fair Value Hedging | Designated as Hedging Instrument [Member] | Loans Payable [Member]            
Derivative [Line Items]            
Derivative, Notional Amount 0   0     0
Cash Flow Hedging | Designated as Hedging Instrument [Member]            
Derivative [Line Items]            
Derivative, Notional Amount 10,450   10,450     17,375
Cash Flow Hedging | Designated as Hedging Instrument [Member] | Loans Payable [Member]            
Derivative [Line Items]            
Derivative, Notional Amount 10,450   10,450     17,375
Commitments to Sell Loans [Member]            
Derivative [Line Items]            
Commitments to sell residential real estate loans $ 2,300   $ 2,300     $ 2,900