v3.22.2.2
Document and Entity Information
Dec. 05, 2022
Document And Entity Information [Line Items]  
Entity Registrant Name KEYCORP /NEW/
Amendment Flag false
Entity Central Index Key 0000091576
Document Type 8-K
Document Period End Date Dec. 05, 2022
Entity File Number 001-11302
Entity Incorporation State 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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Shares 1 Par Value [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Shares, $1 par value
Trading Symbol KEY
Security Exchange Name NYSE
Depositary Shares Each Representing A 140th Interest In A Share Of Fixed To Floating Rate Perpetual Not Cumulative Preferred Stock Series E 4 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares (each representing a 1/40th interest in a share of Fixed-to-Floating Rate Perpetual Non-Cumulative Preferred Stock, Series E)
Trading Symbol KEY PrI
Security Exchange Name NYSE
Depositary Shares Each Representing A 140th Interest In A Share Of Fixed Rate Perpetual Not Cumulative Preferred Stock Series F 1 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares (each representing a 1/40th interest in a share of Fixed Rate Perpetual Non-Cumulative Preferred Stock, Series F)
Trading Symbol KEY PrJ
Security Exchange Name NYSE
Depositary Shares Each Representing A 140th Interest In A Share Of Fixed Rate Perpetual Not Cumulative Preferred Stock Series G 2 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares (each representing a 1/40th interest in a share of Fixed Rate Perpetual Non-Cumulative Preferred Stock, Series G)
Trading Symbol KEY PrK
Security Exchange Name NYSE
Depositary Shares Each Representing A 140th Interest In A Share Of Fixed Rate Reset Perpetual Not Cumulative Preferred Stock Series H 3 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares (each representing a 1/40th interest in a share of Fixed Rate Reset Perpetual Non-Cumulative Preferred Stock, Series H)
Trading Symbol KEY PrL
Security Exchange Name NYSE