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Trust Preferred Securities Issued by Unconsolidated Subsidiaries - Summary of Trust Preferred Securities, Common Stock and Related Debentures (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Stock | $ 1,257 | $ 1,257
Debentures adjustments related to financial instrument hedging | 56 | 70
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 of Debentures, Net of Discount | $ 162 |
Interest Rate of Trust Preferred Securities and Debentures | 0.965% |
KeyCorp Capital II |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 126 |
Common Stock | 4 |
Principal Amount of of Debentures, Net of Discount | $ 130 |
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 | $ 115 |
Common Stock | 4 |
Principal Amount of of Debentures, Net of Discount | $ 119 |
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 | $ 20 |
Common Stock | 1 |
Principal Amount of of Debentures, Net of Discount | $ 21 |
Interest Rate of Trust Preferred Securities and Debentures | 1.605% |
Willow Grove Statutory Trust I |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 19 |
Common Stock | 1 |
Principal Amount of of Debentures, Net of Discount | $ 20 |
Interest Rate of Trust Preferred Securities and Debentures | 1.527% |
HNC Statutory Trust IV |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 17 |
Common Stock | 1 |
Principal Amount of of Debentures, Net of Discount | $ 18 |
Interest Rate of Trust Preferred Securities and Debentures | 1.494% |
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 of Debentures, Net of Discount | $ 8 |
Interest Rate of Trust Preferred Securities and Debentures | 2.429% |
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 of Debentures, Net of Discount | $ 8 |
Interest Rate of Trust Preferred Securities and Debentures | 2.429% |
Business Trusts |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 469 | 483
Common Stock | 17 | 17
Principal Amount of of Debentures, Net of Discount | $ 486 | $ 500
Interest Rate of Trust Preferred Securities and Debentures | 4.334% | 4.464%
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% |
London Interbank Offered Rate (LIBOR) | KeyCorp Capital I |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 0.74% |
London Interbank Offered Rate (LIBOR) | HNC Statutory Trust III |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 1.40% |
London Interbank Offered Rate (LIBOR) | Willow Grove Statutory Trust I |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 1.31% |
London Interbank Offered Rate (LIBOR) | HNC Statutory Trust IV |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 1.28% |
London Interbank Offered Rate (LIBOR) | Westbank Capital Trust II and III |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 2.19% |
Redemption upon either tax or a capital treatment event | 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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