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Leases - Composition of Net Investment in Sales-Type and Direct Financing Leases (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Lease receivables	$ 2,896	$ 3,170
Unearned income	(286)	(253)
Unguaranteed residual value	468	472
Deferred fees and costs	2	5
Net investment in sales-type and direct financing leases	$ 3,080	$ 3,394

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- Definition

Net Investment In Sales-Type And Direct Financing Leases

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Sales-Type And Direct Financing Leases, Deferred Fees And Costs

+ References

No definition available.

+ Details

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Namespace Prefix:	key_
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Balance Type:	debit
Period Type:	instant

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- Definition

Sales-Type And Direct Financing Leases, Unearned Income

+ References

No definition available.

+ Details

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Namespace Prefix:	key_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Sales-Type And Direct Financing Leases, Unguaranteed Residual Asset

+ References

No definition available.

+ Details

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Namespace Prefix:	key_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
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Balance Type:	na
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- Definition

Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type and direct financing leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-10

+ Details

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