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Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table presents the computation of basic and diluted earnings per common share for the periods indicated:
Years Ended December 31,
(Dollars in millions, except per share amounts)
202020192018
Net income
$2,420 $2,242 $2,593 
Less:
Preferred stock dividends
(162)(232)(188)
Dividends and undistributed earnings allocated to participating securities(1)
(1)(1)(1)
Net income available to common shareholders
$2,257 $2,009 $2,404 
Average common shares outstanding (In thousands):
Basic average common shares
352,865 369,911 371,983 
Effect of dilutive securities: equity-based awards
4,241 3,755 4,493 
Diluted average common shares
357,106 373,666 376,476 
Anti-dilutive securities(2)
1,066 2,052 1,011 
Earnings per common share:
Basic
$6.40 $5.43 $6.46 
Diluted(3)
6.32 5.38 6.39 
(1) Represents the portion of net income available to common equity allocated to participating securities, composed of unvested and fully vested SERP (Supplemental executive retirement plans) shares and fully vested deferred director stock awards, which are equity-based awards that contain non-forfeitable rights to dividends, and are considered to participate with the common stock in undistributed earnings.
(2) Represents equity-based awards outstanding but not included in the computation of diluted average common shares, because their effect was anti-dilutive. Additional information about equity-based awards is provided in Note 18.
(3) Calculations reflect allocation of earnings to participating securities using the two-class method, as this computation is more dilutive than the treasury stock method.