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Earnings Per Common Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Common Share
2. Earnings Per Common Share

Basic earnings per share is the amount of earnings (adjusted for dividends declared on our preferred stock) available to each Common Share outstanding during the reporting periods. Diluted earnings per share is the amount of earnings available to each Common Share outstanding during the reporting periods adjusted to include the effects of potentially dilutive Common Shares. Potentially dilutive Common Shares include stock options and other stock-based awards. Potentially dilutive Common Shares are excluded from the computation of diluted earnings per share in the periods where the effect would be antidilutive. 

Our basic and diluted earnings per Common Share are calculated as follows:
Year ended December 31,   
Dollars in millions, except per share amounts202120202019
EARNINGS
Income (loss) from continuing operations$2,612 $1,329 $1,708 
Less: Net income (loss) attributable to noncontrolling interests— — — 
Income (loss) from continuing operations attributable to Key2,612 1,329 1,708 
Less: Dividends on preferred stock106 106 97 
Income (loss) from continuing operations attributable to Key common shareholders2,506 1,223 1,611 
Income (loss) from discontinued operations, net of taxes13 14 9 
Net income (loss) attributable to Key common shareholders$2,519 $1,237 $1,620 
WEIGHTED-AVERAGE COMMON SHARES
Weighted-average Common Shares outstanding (000)947,065 967,783 992,091 
Effect of common share options and other stock awards10,349 7,024 10,163 
Weighted-average common shares and potential Common Shares outstanding (000) (a)
957,414 974,807 1,002,254 
EARNINGS PER COMMON SHARE
Income (loss) from continuing operations attributable to Key common shareholders$2.64 $1.26 $1.62 
Income (loss) from discontinued operations, net of taxes.01 .01 .01 
Net income (loss) attributable to Key common shareholders (b)
2.65 1.28 1.63 
Income (loss) from continuing operations attributable to Key common shareholders — assuming dilution2.62 1.26 1.61 
Income (loss) from discontinued operations, net of taxes — assuming dilution.01 .01 .01 
Net income (loss) attributable to Key common shareholders — assuming dilution (b)
2.63 1.27 1.62 
(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.