Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Narrative (Details)

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BORROWINGS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]      
Carrying value of assets pledged as collateral against repurchase agreements $ 189 $ 189 $ 840
Maturity term   60 days  
Credit Linked Notes | Huntington National Bank Unsecured Notes Maturing May 20, 2032      
Debt Instrument [Line Items]      
Debt stated interest rate 6.153% 6.153%  
Weighted average rate 6.98% 6.98%  
Credit Linked Notes | Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.40%    
Credit Linked Notes | Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 8.25%    
Credit Linked Notes | Huntington National Bank Unsecured Notes Maturing May 20, 2032 | Weighted Average      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.04%    
Auto Loan Securitization Trust      
Debt Instrument [Line Items]      
Weighted average rate 5.38% 5.38%  
Auto Loan Securitization Trust | Huntington National Bank Unsecured Notes Maturing May 20, 2032      
Debt Instrument [Line Items]      
Reference pool $ 4,000 $ 4,000