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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
 
2016
Net income
$
2,599

 
$
2,177

 
$
2,143

Less:
 
 
 
 
 
Preferred stock dividends
(188
)
 
(182
)
 
(173
)
Dividends and undistributed earnings allocated to participating securities(1)
(1
)
 
(2
)
 
(2
)
Net income available to common shareholders
$
2,410

 
$
1,993


$
1,968

Average common shares outstanding (In thousands):
 
 
 
 
 
Basic average common shares
371,983

 
374,793

 
391,485

Effect of dilutive securities: equity-based awards
4,493

 
5,420

 
4,605

Diluted average common shares
376,476

 
380,213


396,090

Anti-dilutive securities(2)
1,011

 
188

 
2,143

Earnings per common share:
 
 
 
 
 
Basic
$
6.48

 
$
5.32

 
$
5.03

Diluted(3)
6.40

 
5.24

 
4.97

 
 

(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. 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.