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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2025
Regulated Operations [Abstract] |
Schedule of Key's and KeyBank's Actual Capital Amounts and Ratios, Minimum Capital Amounts and Ratios | At December 31, 2025, Key and KeyBank (consolidated) had regulatory capital in excess of all current minimum risk-based capital (including all adjustments for market risk) and leverage ratio requirements as shown in the following table.
| Actual |  |  | Regulatory Minimum | Regulatory Minimum with Stress Capital Buffer |  | Well Capitalized
Dollars in millions | Amount | Ratio |  |  | Ratio | Ratio |  | Ratio
December 31, 2025 |  |  |  |  |  |  |  |
Total risk-based capital |  |  |  |  |  |  |  |
Key | $ | 22,910 |  | 15.70 | % |  |  | 8.00 | % | 11.20 | % |  | N/A
KeyBank (consolidated) | 21,198 |  | 14.71 |  |  |  | 8.00 |  | 11.20 |  |  | 10.00 | %
Common equity Tier 1 risk-based capital |  |  |  |  |  |  |  |
Key | $ | 17,195 |  | 11.78 | % |  |  | 4.50 | % | 7.70 | % |  | N/A
KeyBank (consolidated) | 18,376 |  | 12.75 |  |  |  | 4.50 |  | 7.70 |  |  | 6.50 | %
Tier 1 risk-based capital |  |  |  |  |  |  |  |
Key | $ | 19,641 |  | 13.46 | % |  |  | 6.00 | % | 9.20 | % |  | N/A
KeyBank (consolidated) | 18,376 |  | 12.75 |  |  |  | 6.00 |  | 9.20 |  |  | 8.00 | %
Leverage |  |  |  |  |  |  |  |
Key | $ | 19,641 |  | 10.50 | % |  |  | 4.00 | % | 4.00 | % |  | N/A
KeyBank (consolidated) | 18,376 |  | 9.96 |  |  |  | 4.00 |  | 4.00 |  |  | 5.00 | %
December 31, 2024 |  |  |  |  |  |  |  |
Total risk-based capital |  |  |  |  |  |  |  |
Key | $ | 22,336 |  | 16.15 | % |  |  | 8.00 | % | 11.10 | % |  | N/A
KeyBank (consolidated) | 20,518 |  | 15.12 |  |  |  | 8.00 |  | 11.10 |  |  | 10.00 | %
Common equity Tier 1 risk-based capital |  |  |  |  |  |  |  |
Key | $ | 16,489 |  | 11.92 | % |  |  | 4.50 | % | 7.60 | % |  | N/A
KeyBank (consolidated) | 17,560 |  | 12.94 |  |  |  | 4.50 |  | 7.60 |  |  | 6.50 |
Tier 1 risk-based capital |  |  |  |  |  |  |  |
Key | $ | 18,934 |  | 13.69 | % |  |  | 6.00 | % | 9.10 | % |  | N/A
KeyBank (consolidated) | 17,560 |  | 12.94 |  |  |  | 6.00 |  | 9.10 |  |  | 8.00 | %
Leverage |  |  |  |  |  |  |  |
Key | $ | 18,934 |  | 10.03 | % |  |  | 4.00 | % | 4.00 | % |  | N/A
KeyBank (consolidated) | 17,560 |  | 9.42 |  |  |  | 4.00 |  | 4.00 |  |  | 5.00 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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