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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
EARNINGS |  |  |  |
Income (loss) from continuing operations |  | $ 964 | $ 1,911 | $ 2,612
Less: Net income (loss) attributable to noncontrolling interests |  | 0 | 0 | 0
Income (loss) from continuing operations attributable to Key |  | 964 | 1,911 | 2,612
Less: Dividends on preferred stock |  | 143 | 118 | 106
Income (loss) from continuing operations attributable to Key common shareholders |  | 821 | 1,793 | 2,506
Income (loss) from discontinued operations, net of taxes |  | 3 | 6 | 13
Net income (loss) attributable to Key common shareholders |  | $ 824 | $ 1,799 | $ 2,519
WEIGHTED-AVERAGE COMMON SHARES |  |  |  |
Weighted-average common shares outstanding (in shares) |  | 927,217 | 924,363 | 947,065
Effect of common share options and other stock awards (in shares) |  | 5,542 | 8,696 | 10,349
Weighted-average common shares and potential common shares outstanding (in shares) | [1] | 932,759 | 933,059 | 957,414
EARNINGS PER COMMON SHARE |  |  |  |
Income (loss) from continuing operations attributable to Key common shareholders (in dollars per share) |  | $ 0.88 | $ 1.94 | $ 2.64
Income (loss) from discontinued operations, net of taxes (in dollars per share) |  | 0 | 0.01 | 0.01
Net income (loss) attributable to Key common shareholders (in dollars per share) | [2] | 0.89 | 1.94 | 2.65
Income (loss) from continuing operations attributable to Key common shareholders - assuming dilution (in dollars per share) |  | 0.88 | 1.92 | 2.62
Income (loss) from discontinued operations, net of taxes — assuming dilution (in dollars per share) |  | 0 | 0.01 | 0.01
Net income (loss) attributable to Key common shareholders (in dollars per share) | [2] | $ 0.88 | $ 1.93 | $ 2.63
[1] | Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable.
[2] | EPS may not foot due to rounding.

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