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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 | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Stock | $ 1,257 | $ 1,257
Debentures adjustments related to financial instrument hedging | 57 | 46
KeyCorp Capital I [Member] |  |
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 | 2.649% |
KeyCorp Capital II [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 105 |
Common Stock | 4 |
Principal Amount of of Debentures, Net of Discount | $ 109 |
Interest Rate of Trust Preferred Securities and Debentures | 6.875% |
KeyCorp Capital III [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 137 |
Common Stock | 4 |
Principal Amount of of Debentures, Net of Discount | $ 141 |
Interest Rate of Trust Preferred Securities and Debentures | 7.75% |
HNC Statutory Trust III [Member] |  |
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 | 3.31% |
Willow Grove Statutory Trust I [Member] |  |
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 | 3.204% |
HNC Statutory Trust IV [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 16 |
Common Stock | 1 |
Principal Amount of of Debentures, Net of Discount | $ 17 |
Interest Rate of Trust Preferred Securities and Debentures | 3.216% |
Westbank Capital Trust II [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 7 |
Common Stock | 0 |
Principal Amount of of Debentures, Net of Discount | $ 7 |
Interest Rate of Trust Preferred Securities and Debentures | 4.098% |
Westbank Capital Trust III [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 7 |
Common Stock | 0 |
Principal Amount of of Debentures, Net of Discount | $ 7 |
Interest Rate of Trust Preferred Securities and Debentures | 4.098% |
Business Trusts [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities, Net of Discount | $ 466 | 454
Common Stock | 17 | 17
Principal Amount of of Debentures, Net of Discount | $ 483 | $ 471
Interest Rate of Trust Preferred Securities and Debentures | 5.214% | 5.447%
Treasury Rate [Member] | KeyCorp Capital II [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 0.20% |
Treasury Rate [Member] | KeyCorp Capital III [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 0.25% |
London Interbank Offered Rate (LIBOR) [Member] | KeyCorp Capital I [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 0.74% |
London Interbank Offered Rate (LIBOR) [Member] | HNC Statutory Trust III [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 1.40% |
London Interbank Offered Rate (LIBOR) [Member] | Willow Grove Statutory Trust I [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 1.31% |
London Interbank Offered Rate (LIBOR) [Member] | HNC Statutory Trust IV [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 1.28% |
London Interbank Offered Rate (LIBOR) [Member] | Westbank Capital Trust II and III [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 2.19% |
Debt Instrument, Redemption, Period Five [Member] | Treasury Rate [Member] | Keycorp Capital II and III [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basis spread on variable rate | 0.50% |

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