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Trust Preferred Securities Issued by Unconsolidated Subsidiaries (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Stock $ 1,257 $ 1,257
Debentures adjustments related to financial instrument hedging 15 17
KeyCorp Capital I    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount 156  
Common Stock 6  
Principal amount of debentures, net of discount $ 162  
Interest rate of trust preferred securities and debentures 6.396%  
KeyCorp Capital II    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount $ 87  
Common Stock 4  
Principal amount of debentures, net of discount $ 91  
Interest rate of trust preferred securities and debentures 6.875%  
KeyCorp Capital III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount $ 113  
Common Stock 4  
Principal amount of debentures, net of discount $ 117  
Interest rate of trust preferred securities and debentures 7.75%  
HNC Statutory Trust III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount $ 21  
Common Stock 1  
Principal amount of debentures, net of discount $ 22  
Interest rate of trust preferred securities and debentures 7.04%  
HNC Statutory Trust IV    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount $ 18  
Common Stock 1  
Principal amount of debentures, net of discount $ 19  
Interest rate of trust preferred securities and debentures 6.932%  
Willow Grove Statutory Trust I    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount $ 20  
Common Stock 1  
Principal amount of debentures, net of discount $ 21  
Interest rate of trust preferred securities and debentures 6.956%  
Westbank Capital Trust II    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount $ 8  
Common Stock 0  
Principal amount of debentures, net of discount $ 8  
Interest rate of trust preferred securities and debentures 7.822%  
Westbank Capital Trust III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount $ 8  
Common Stock 0  
Principal amount of debentures, net of discount $ 8  
Interest rate of trust preferred securities and debentures 7.822%  
Business Trusts    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Trust preferred securities, net of discount $ 431 433
Common Stock 17 17
Principal amount of debentures, net of discount $ 448 $ 450
Interest rate of trust preferred securities and debentures 6.981% 5.321%
Treasury Rate | KeyCorp Capital II    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Basis spread on variable rate 0.20%  
Treasury Rate | KeyCorp Capital III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Basis spread on variable rate 0.25%  
Secured Overnight Financing Rate (SOFR) | Westbank Capital Trust II and III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Basis spread on variable rate 0.26161%  
Debt Instrument, Redemption, Period Five | Treasury Rate | Keycorp Capital II and III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Basis spread on variable rate 0.50%