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Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2017
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)
2017

2016
 
2015
Net income
$
2,177

 
$
2,143

 
$
1,980

Less:
 
 
 
 
 
Preferred stock dividends
(182
)
 
(173
)
 
(130
)
Dividends and undistributed earnings allocated to participating securities(1)
(2
)
 
(2
)
 
(2
)
Net income available to common shareholders
$
1,993

 
$
1,968

 
$
1,848

Average common shares outstanding (In thousands):
 
 
 
 
 
Basic average common shares
374,793

 
391,485

 
407,856

Effect of dilutive securities: equity-based awards
5,420

 
4,605

 
5,782

Diluted average common shares
380,213

 
396,090

 
413,638

Anti-dilutive securities(2)
188

 
2,143

 
661

Earnings per Common Share:
 
 
 
 
 
Basic
$
5.32

 
$
5.03

 
$
4.53

Diluted(3)
5.24

 
4.97

 
4.47

 
 

(1) Represents the portion of net income available to common equity allocated to participating securities, composed of unvested and fully vested SERP 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. Refer to Note 18 for additional information about equity-based awards.
(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.