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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% |

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