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 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
group
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Derivative [Line Items]          
Increase (decrease) to net interest income due to derivative adjustment $ 61 $ 82 $ 291 $ 151  
Fair value hedging adjustments     (35)   $ (62)
Derivative, Notional Amount 20,324   20,324   33,327
Credit risks from interest rate swaps used for trading purposes 787   787   882
Derivative Liability 250   $ 250   116
Number of primary groups | group     2    
Aggregate credit risk, net of collateral 113   $ 113   175
Investment securities and cash collateral pledged by Huntington 486   486    
Investment securities and cash collateral pledged to Huntington 264   264    
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness (29) $ (40) $ (102) $ 279  
Derivative, Remaining Maturity     1 year    
Loans Payable [Member]          
Derivative [Line Items]          
Derivative, Notional Amount 8,196   $ 8,196   18,646
Derivative used in trading activity          
Derivative [Line Items]          
Net derivative asset (liability) 53   53   70
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 53,000   53,000   37,000
Derivative used in Mortgage Banking Activities          
Derivative [Line Items]          
Derivative, Notional Amount 1,153   1,153   1,170
Derivative, Fair Value, Net 34   34   26
Foreign Exchange Forward          
Derivative [Line Items]          
Derivative, Notional Amount 209   209    
Fair Value Hedging | Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Derivative, Notional Amount 12,128   12,128   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 7,925   7,925   17,375
Cash Flow Hedging | Designated as Hedging Instrument [Member] | Loans Payable [Member]          
Derivative [Line Items]          
Derivative, Notional Amount 7,925   7,925   17,375
Commitments to Sell Loans [Member]          
Derivative [Line Items]          
Commitments to sell residential real estate loans $ 2,700   $ 2,700   $ 2,900