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Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
EARNINGS |  |  |  |
Income (loss) from continuing operations |  | $ 1,708 | $ 1,859 | $ 1,291
Less: Net income (loss) attributable to noncontrolling interests |  | 0 | 0 | 2
Income (loss) from continuing operations attributable to Key |  | 1,708 | 1,859 | 1,289
Less: Dividends on preferred stock |  | 97 | 66 | 70
Income (loss) from continuing operations attributable to Key common shareholders |  | 1,611 | 1,793 | 1,219
Income (loss) from discontinued operations, net of taxes |  | 9 | 7 | 7
Net income (loss) attributable to Key common shareholders |  | $ 1,620 | $ 1,800 | $ 1,226
WEIGHTED-AVERAGE COMMON SHARES |  |  |  |
Weighted-average common shares outstanding (in shares) |  | 992,091 | 1,040,890 | 1,072,078
Effect of common share options and other stock awards (in shares) |  | 10,163 | 13,792 | 16,515
Weighted-average common shares and potential common shares outstanding (in shares) | [1] | 1,002,254 | 1,054,682 | 1,088,593
EARNINGS PER COMMON SHARE |  |  |  |
Income (loss) from continuing operations attributable to Key common shareholders (in dollars per share) |  | $ 1.62 | $ 1.72 | $ 1.13
Income (loss) from discontinued operations, net of taxes (in dollars per share) |  | 0.01 | 0.01 | 0.01
Net income (loss) attributable to Key common shareholders (in dollars per share) | [2] | 1.63 | 1.73 | 1.14
Income (loss) from continuing operations attributable to Key common shareholders - assuming dilution (in dollars per share) |  | 1.61 | 1.70 | 1.12
Income (loss) from discontinued operations, net of taxes (in dollars per share) |  | 0.01 | 0.01 | 0.01
Net income (loss) attributable to Key common shareholders (in dollars per share) | [2] | $ 1.62 | $ 1.71 | $ 1.13
[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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