v3.26.1
Securities - Additional Information (Details)
$ in Billions
Dec. 31, 2025
USD ($)
Investments, Debt and Equity Securities [Abstract]
Securities pledged to secure securities sold under repurchase agreements
$ 18.7
X
- Definition
Debt Securities, Available For Sale And Held To Maturity, Pledged
+ References
No definition available.
+ Details
Name:
key_DebtSecuritiesAvailableForSaleAndHeldToMaturityPledged
Namespace Prefix:
key_
Data Type:
xbrli:monetaryItemType
Balance Type:
debit
Period Type:
instant
X
- References
No definition available.
+ Details
Name:
us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix:
us-gaap_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration