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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 28, 2019
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-11302    
Entity Registrant Name KeyCorp    
Entity Incorporation, State or Country Code OH    
Entity Tax Identification Number 34-6542451    
Entity Address, Address Line One 127 Public Square,    
Entity Address, City or Town Cleveland,    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 44114-1306    
City Area Code 216    
Local Phone Number 689-3000    
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    
Entity Shell Company false    
Entity Public Float     $ 17,805,275,417
Entity Common Stock, Shares Outstanding   969,889,701  
Documents Incorporated by Reference
Certain specifically designated portions of KeyCorp’s definitive Proxy Statement for its 2020 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10-K.
    
Amendment Flag false    
Entity Central Index Key 0000091576    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Common Stock [Member]      
Entity Information [Line Items]      
Title of 12(b) Security Common Shares, $1 par value    
Trading Symbol KEY    
Security Exchange Name NYSE    
Series E Preferred Stock [Member]      
Entity Information [Line Items]      
Title of 12(b) Security Perpetual Non-Cumulative Preferred Stock, Series E)    
Trading Symbol KEY PrI    
Security Exchange Name NYSE    
Series F Preferred Stock [Member]      
Entity Information [Line Items]      
Title of 12(b) Security Cumulative Preferred Stock, Series F)    
Trading Symbol KEY PrJ    
Security Exchange Name NYSE    
Series G Preferred Stock [Member]      
Entity Information [Line Items]      
Title of 12(b) Security Cumulative Preferred Stock, Series G)    
Trading Symbol KEY PrK    
Security Exchange Name NYSE