XML 155 R81.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Asset Quality - Post-Modification Outstanding Recorded Investment TDRs (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($)
Financing Receivables, Modifications, Rollforward [Roll Forward] |
Balance at beginning of the period | $ 220
Additions | 79
Payments | (45)
Charge-offs | (18)
Balance at end of period | $ 236

X
- Definition Financing Receivable, Modifications, Additions + References No definition available. + Details
Name: | key_FinancingReceivableModificationsAdditions
Namespace Prefix: | key_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Modifications, Payments + References No definition available. + Details
Name: | key_FinancingReceivableModificationsPayments
Namespace Prefix: | key_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Troubled Debt Restructuring, Charge-Offs + References No definition available. + Details
Name: | key_FinancingReceivableTroubledDebtRestructuringChargeOffs
Namespace Prefix: | key_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivables, Modifications, Rollforward [Roll Forward] + References No definition available. + Details
Name: | key_FinancingReceivablesModificationsRollforwardRollForward
Namespace Prefix: | key_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 310 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481746/310-40-50-4 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant