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Earnings Per Common Share (EPS) (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Computation of basic and diluted EPS
The computations of basic and diluted EPS for the three and six months ended June 30 were as follows:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(Millions, except per share amounts)
 
2019

 
2018

 
2019

 
2018

Numerator:
 
 
 
 
 
 
 
 
Basic and diluted:
 
 
 
 
 
 
 
 
Net income
 
$
1,761

 
$
1,623

 
$
3,311

 
$
3,257

Preferred dividends
 
(19
)
 
(20
)
 
(40
)
 
(41
)
Net income available to common shareholders
 
$
1,742

 
$
1,603

 
$
3,271

 
$
3,216

Earnings allocated to participating share awards (a)
 
(13
)
 
(12
)
 
(24
)
 
(25
)
Net income attributable to common shareholders
 
$
1,729

 
$
1,591

 
$
3,247

 
$
3,191

Denominator: (a)
 
 
 
 
 
 
 
 
Basic: Weighted-average common stock
 
834

 
860

 
837

 
859

Add: Weighted-average stock options (b)
 
2

 
2

 
2

 
3

Diluted
 
836

 
862

 
839

 
862

 
 
 
 
 
 
 
 
 
Basic EPS
 
$
2.07

 
$
1.85

 
$
3.88

 
$
3.71

Diluted EPS
 
$
2.07

 
$
1.84

 
$
3.87

 
$
3.70

(a)
Our unvested restricted stock awards, which include the right to receive non-forfeitable dividends or dividend equivalents, are considered participating securities. Calculations of EPS under the two-class method exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities. The related participating securities are similarly excluded from the denominator.
(b)
The dilutive effect of unexercised stock options excludes from the computation of EPS 0.4 million and 0.7 million of options for the three months ended June 30, 2019 and 2018, respectively, and 0.4 million and 0.7 million of options for the six months ended June 30, 2019 and 2018, respectively, because inclusion of the options would have been anti-dilutive.