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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2026
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Earnings Per Common Share | Our basic and diluted earnings per Common Share are calculated as follows:
| Three months ended June 30, |  | Six months ended June 30,
Dollars in millions, except per share amounts | 2026 | 2025 |  | 2026 | 2025
EARNINGS |  |  |  |  |
Income (loss) from continuing operations | $ | 508 |  | $ | 423 |  |  | $ | 1,030 |  | $ | 829 |
Less: Dividends on Preferred Stock | 36 |  | 36 |  |  | 72 |  | 72 |
Income (loss) from continuing operations attributable to Key common shareholders | 472 |  | 387 |  |  | 958 |  | 757 |
Income (loss) from discontinued operations, net of taxes | 1 |  | 2 |  |  | 1 |  | 1 |
Net income (loss) attributable to Key common shareholders | $ | 473 |  | $ | 389 |  |  | $ | 959 |  | $ | 758 |
WEIGHTED-AVERAGE COMMON SHARES |  |  |  |  |
Weighted-average Common Shares outstanding (000) | 1,071,229 |  | 1,100,033 |  |  | 1,077,977 |  | 1,098,453 |
Effect of Common Share options and other stock awards | 8,779 |  | 7,177 |  |  | 9,435 |  | 8,331 |
Weighted-average Common Shares and potential Common Shares outstanding (000)(a) | 1,080,008 |  | 1,107,210 |  |  | 1,087,412 |  | 1,106,784 |
EARNINGS PER COMMON SHARE |  |  |  |  |
Income (loss) from continuing operations attributable to Key common shareholders | $ | .44 |  | $ | .35 |  |  | $ | .89 |  | $ | .69 |
Income (loss) from discontinued operations, net of taxes | — |  | — |  |  | — |  | — |
Net income (loss) attributable to Key common shareholders (b) | .44 |  | .35 |  |  | .89 |  | .69 |
Income (loss) from continuing operations attributable to Key common shareholders — assuming dilution | $ | .44 |  | $ | .35 |  |  | $ | .88 |  | $ | .69 |
Income (loss) from discontinued operations, net of taxes — assuming dilution | — |  | — |  |  | — |  | — |
Net income (loss) attributable to Key common shareholders—assuming dilution(b) | .44 |  | .35 |  |  | .88 |  | .69 |
(a)Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable. (b)EPS may not foot due to rounding.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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