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Common Stock (Tables)
 12 Months Ended
Dec. 31, 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 stock outstanding to the diluted weighted average number of common stock outstanding.
 
Years Ended December 31,
(in millions, except per share amounts)
2017

 
2016

 
2015

Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities
$
3,059

 
$
2,567

 
$
2,640

Weighted average shares outstanding – basic
700

 
691

 
694

Weighted average shares outstanding – diluted
700

 
691

 
694

Earnings per share from continuing operations attributable to Duke Energy common stockholders
 
 
 
 
 
Basic
$
4.37

 
$
3.71

 
$
3.80

Diluted
$
4.37

 
$
3.71

 
$
3.80

Potentially dilutive items excluded from the calculation(a)
2

 
2

 
2

Dividends declared per common share
$
3.49

 
$
3.36

 
$
3.24

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