Quarterly report [Sections 13 or 15(d)]

BORROWINGS - Narrative (Details)

v3.25.2
BORROWINGS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Carrying value of assets pledged as collateral against repurchase agreements   $ 219 $ 224
Maturity term   60 days  
Auto Loan Securitization Trust      
Debt Instrument [Line Items]      
Weighted average rate   5.26%  
Auto Loan Securitization Trust | Huntington National Bank Unsecured Notes Maturing March 2033      
Debt Instrument [Line Items]      
Reference pool $ 3,500    
Credit Linked Notes | Huntington National Bank Unsecured Notes Maturing March 2033      
Debt Instrument [Line Items]      
Debt face amount $ 415    
Debt stated interest rate 4.957%    
Credit Linked Notes | Huntington National Bank Unsecured Notes Maturing March 2033 | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.25%    
Credit Linked Notes | Huntington National Bank Unsecured Notes Maturing March 2033 | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 7.15%    
Credit Linked Notes | Huntington National Bank Unsecured Notes Maturing March 2033 | Weighted average      
Debt Instrument [Line Items]      
Basis spread on variable rate 4.28%    
Senior Notes | Fixed-to-Floating Senior Notes Due April 12, 2028      
Debt Instrument [Line Items]      
Debt face amount $ 1,000    
Debt stated interest rate 4.871%    
Basis spread on variable rate 0.726%    
Senior Notes | Floating Senior Notes Due April 12, 2028      
Debt Instrument [Line Items]      
Debt face amount $ 500    
Basis spread on variable rate 0.72%