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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Accounting Guidance Adopted in 2023


Standard			Date of Adoption			Description			Effect on Financial Statements or Other Significant Matters
ASU 2021-08, Business Combinations (Topic 805)			January 1, 2023			At the acquisition date, an acquirer must account for any acquired revenue contracts in accordance with Topic 606 as if it had originated the contracts (i.e., measure contract assets and liabilities, generally consistent with acquiree's financial statements). The guidance should be applied on a prospective basis.			The adoption of this guidance did not have a material impact on Key’s financial condition or results of operations.
ASU 2022-01, Derivatives and Hedging (Topic 815)			January 1, 2023			This guidance allows entities to apply the same portfolio hedging method to both prepayable and nonprepayable financial assets. It also allows multiple hedged layers to be designated for a single closed portfolio of financial assets or one or more beneficial interests secured by a portfolio of financial instruments. If a breach is anticipated, an entity is required to partially or fully dedesignate a hedged layer or layers until a breach is no longer anticipated. There are additional requirements and enhanced disclosures related to basis adjustments. The guidance should be applied on a prospective, retrospective or modified retrospective basis depending on the amendment.			The adoption of this guidance did not have a material impact on Key’s financial condition or results of operations.
ASU 2022-02, Financial Instruments—Credit Losses (Topic 326)			January 1, 2023			The amendments eliminate current Troubled Debt Restructuring (TDR) guidance and instead require entities to apply the loan refinancing and restructuring guidance to determine whether a modification results in a new loan or is a continuation of an existing loan. Entities must disclose current-period gross write-offs on an amortized cost basis by credit quality indicator and class of financing receivable by year of origination. The guidance should be applied on a prospective basis except for amendments related to recognition and measurement of TDRs, where a modified retrospective transition method is optional.			The adoption of this guidance did not have a material impact on Key's financial condition or results of operations. Newly required disclosures are included in Note 5 (“Asset Quality”).
ASU 2023-02, Investments—Equity Method and Joint Ventures (Topic 323)			January 1, 2023			Reporting entities may elect to account for their tax equity investments, not limited to LIHTC structures, using the proportional amortization method as long as certain criteria are met. Entities must make an accounting policy election to apply the proportional amortization method on a tax credit-program-by-tax-credit-program basis. Also, LIHTC investments not accounted for using the proportional amortization method will no longer be allowed to use the delayed equity contribution guidance. Further, accounting guidance in ASC 323-740 is now only applicable to tax equity investments accounted for using the proportional amortization method. The guidance should be applied on a modified retrospective or retrospective basis.			The guidance did not have a material impact on Key’s financial condition or results of operations. Key adopted this guidance on a modified retrospective basis.

Accounting Guidance Adopted in 2024


Standard			Date of Adoption			Description			Effect on Financial Statements or Other Significant Matters
ASU 2022-03, Fair Value Measurement - Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions (Topic 820)			January 1, 2024			The amendments clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and is not considered in measuring fair value. Entities cannot, as a separate unit of account, recognize and measure a contractual sale restriction. The amendments require disclosures for equity securities subject to contractual restrictions including; the fair value of equity securities subject to contractual sale restrictions reflected in the balance sheet, the nature and remaining duration of the restriction(s) and the circumstances that could cause a lapse in the restriction(s). The guidance should be applied prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption.			The guidance did not have a material impact on Key’s financial condition or results of operations.