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, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative [Line Items]      
Increase (decrease) to net interest income due to derivative adjustment $ (248) $ 76 $ 337
Purchase of interest rate caps and derivative financial instruments, notional value 38,192 42,636  
Credit risks from interest rate swaps used for trading purposes 122 118  
Derivative liabilities 670 992  
Aggregate credit risk, net of collateral 238 227  
Investment securities and cash collateral pledged by Huntington 206    
Investment securities and cash collateral pledged to company 745    
Investment securities      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 11,649 10,407  
Cash Flow Hedging      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 16,675 24,325  
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) 47 59  
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 44,500 40,700  
Derivative used in Mortgage Banking Activities      
Derivative [Line Items]      
Purchase of interest rate caps and derivative financial instruments, notional value 1,668 1,120  
Net asset position (4) (3)  
Investment Securities      
Derivative [Line Items]      
Designated hedged items 11,000    
Commitments to Sell Loans      
Derivative [Line Items]      
Commitments to sell residential real estate loans $ 674 $ 766