Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]      
Increase (decrease) to net interest income due to derivative adjustment $ 76 $ 337 $ 239
Purchase of interest rate caps and derivative financial instruments, notional value 42,636 21,577  
Credit risks from interest rate swaps used for trading purposes 118 551  
Gains (losses) recognized in OCI (695) (192) $ 232
Derivative liabilities 992 119  
Aggregate credit risk, net of collateral 227 44  
Investment securities and cash collateral pledged by Huntington 236 574  
Investment securities      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 10,407 8,228  
Cash Flow Hedging      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 24,325 11,150  
Cash Flow Hedging | Derivatives designated as Hedging Instruments | Investment securities      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 0 0  
Derivative used in trading activity      
Derivative [Line Items]      
Net derivative asset (liability) 59 51  
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 40,700 45,100  
Derivative used in Mortgage Banking Activities      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 1,120 1,330  
Net asset position (3) 15  
Investment Securities      
Derivative [Line Items]      
Designated hedged items 9,500    
Commitments to Sell Loans      
Derivative [Line Items]      
Commitments to sell residential real estate loans $ 766 $ 2,100