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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [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)
2018

 
2017

 
2016

Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities
$
2,642

 
$
3,059

 
$
2,567

Weighted average shares outstanding – basic
708

 
700

 
691

Weighted average shares outstanding – diluted
708

 
700

 
691

Earnings per share from continuing operations attributable to Duke Energy common stockholders
 
 
 
 
 
Basic
$
3.73

 
$
4.37

 
$
3.71

Diluted
$
3.73

 
$
4.37

 
$
3.71

Potentially dilutive items excluded from the calculation(a)
2

 
2

 
2

Dividends declared per common share
$
3.64

 
$
3.49

 
$
3.36

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