Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)

v3.20.4
DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Fair value hedging adjustments $ 62 $ 93  
Increase (decrease) to net interest income due to derivative adjustment 239 (53) $ (36)
Gross amounts of recognized liabilities (less than) 1,033 521  
Purchase of interest rate caps and derivative financial instruments, notional value 33,327 25,927  
Credit risks from interest rate swaps used for trading purposes 882 407  
Derivative liabilities 116 104  
Aggregate credit risk, net of collateral 175 22  
Investment securities and cash collateral pledged by Huntington 276 387  
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness 234 23  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 37    
Loans      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 18,646 18,375  
Cash Flow Hedging      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 17,375 18,387  
Cash Flow Hedging | Derivatives designated as Hedging Instruments | Loans      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 17,375 18,375  
Derivative used in trading activity      
Derivative [Line Items]      
Net derivative asset (liability) 70 87  
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 37,000 30,000  
Derivative used in Mortgage Banking Activities      
Derivative [Line Items]      
Derivative, Fair Value, Net 26 6  
Purchase of interest rate caps and derivative financial instruments, notional value 1,170 778  
Commitments to Sell Loans      
Derivative [Line Items]      
Commitments to sell residential real estate loans $ 2,900 $ 1,400