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Short-Term Borrowings - Additional Information (Details) $ in Billions	Dec. 31, 2023 USD ($)
Short-term Debt [Line Items]
Deposits with the federal reserve	$ 10.7
Federal Reserve Bank of Cleveland
Short-term Debt [Line Items]
Unused secured borrowing capacity	54.7
Federal Home Loan Bank of Cincinnati
Short-term Debt [Line Items]
Unused secured borrowing capacity	$ 13.6

X

- Definition

Cash Reserve Deposited At Federal Reserve Bank

+ References

No definition available.

+ Details

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Namespace Prefix:	key_
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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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