Annual report pursuant to Section 13 and 15(d)

Cover Page

v3.20.4
Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Jan. 31, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Entity File Number 1-34073    
Entity Registrant Name HUNTINGTON BANCSHARES INC/MD    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 31-0724920    
Entity Address, Address Line One 41 South High Street    
Entity Address, City or Town Columbus,    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 43287    
City Area Code 614    
Local Phone Number 480-2265    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 9,353,081,984
Entity Common Stock, Shares Outstanding   1,017,194,968  
Entity Central Index Key 0000049196    
Document Transition Report false    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Documents Incorporated by Reference Part III of this Form 10-K incorporates by reference certain information from the registrant’s definitive Proxy Statement for the 2021 Annual Shareholders’ Meeting.    
Depositary Shares (each representing a 1/40th interest in a share of 5.875% Series C Non-Cumulative, perpetual preferred stock)      
Entity Information [Line Items]      
Title of 12(b) Security Depositary Shares (each representing a 1/40th interest in a share of 5.875% Series C Non-Cumulative, perpetual preferred stock)    
Trading Symbol HBANN    
Security Exchange Name NASDAQ    
Depositary Shares (each representing a 1/40th interest in a share of 6.250% Series D Non-Cumulative, perpetual preferred stock)      
Entity Information [Line Items]      
Title of 12(b) Security Depositary Shares (each representing a 1/40th interest in a share of 6.250% Series D Non-Cumulative, perpetual preferred stock)    
Trading Symbol HBANO    
Security Exchange Name NASDAQ    
Depositary Shares (each representing a 1/40th interest in a share of 6.250% Series D Non-Cumulative, perpetual preferred stock)      
Entity Information [Line Items]      
Title of 12(b) Security Depositary Shares (each representing a 1/40th interest in a share of 4.500% Series H Non-Cumulative, perpetual preferred stock)    
Trading Symbol HBANP    
Security Exchange Name NASDAQ    
Common Stock—Par Value $0.01 per Share      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock—Par Value $0.01 per Share    
Trading Symbol HBAN    
Security Exchange Name NASDAQ