Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Schedule of Long-Term Debt and Debt Issuances (Details)

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BORROWINGS - Schedule of Long-Term Debt and Debt Issuances (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt $ 7,779 $ 8,352
Subordinated Notes | 4.600% Huntington National Bank subordinated notes due 2025    
Debt Instrument [Line Items]    
Debt stated interest rate 4.60%  
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Long-term debt $ 216 3
Notes Payable, Other Payables    
Debt Instrument [Line Items]    
Long-term debt 460 441
Parent    
Debt Instrument [Line Items]    
Long-term debt 3,839 4,142
Parent | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 2,802 3,635
Parent | Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt $ 1,037 507
Parent | Subordinated Notes | 3.55% Huntington Bancshares Incorporated subordinated notes due 2023    
Debt Instrument [Line Items]    
Debt stated interest rate 4.35%  
Bank    
Debt Instrument [Line Items]    
Long-term debt $ 3,264 3,766
Bank | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 2,451 3,533
Bank | Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt $ 813 $ 233