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Common Stock (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share
The following table presents Duke Energy’s basic and diluted EPS calculations and reconciles the weighted average number of common shares outstanding to the diluted weighted average number of common shares outstanding.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions, except per-share amounts)
2017

 
2016

 
2017

 
2016

Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities
$
954

 
$
998

 
$
2,356

 
$
2,194

Weighted average shares outstanding – basic
700

 
689

 
700

 
689

Equity Forwards
—

 
2

 
—

 
1

Weighted average shares outstanding – diluted
700
 
691
 
700
 
690
Earnings per share from continuing operations attributable to Duke Energy common stockholders
 
 
 
 
 
 
 
Basic
$
1.36

 
$
1.44

 
$
3.37

 
$
3.19

Diluted
$
1.36

 
$
1.44

 
$
3.37

 
$
3.18

Potentially dilutive items excluded from the calculation(a)
2

 
2

 
2
 
2
Dividends declared per common share
$
0.89

 
$
0.855

 
$
2.60

 
$
2.505

(a)
Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met.