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Common Stock (Tables)
 6 Months Ended
Jun. 30, 2018
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 June 30,
 
Six Months Ended June 30,
(in millions, except per-share amounts)
2018

 
2017

 
2018

 
2017

Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities
$
504

 
$
687

 
$
1,123

 
$
1,402

Weighted average shares outstanding – basic
703

 
700

 
702

 
700

Equity Forwards
1

 
—

 
—

 
—

Weighted average shares outstanding – diluted
704
 
700
 
702
 
700
Earnings per share from continuing operations attributable to Duke Energy common stockholders
 
 
 
 
 
 
 
Basic
$
0.72

 
$
0.98

 
$
1.60

 
$
2.00

Diluted
$
0.72

 
$
0.98

 
$
1.60

 
$
2.00

Potentially dilutive items excluded from the calculation(a)
2

 
2

 
2
 
2
Dividends declared per common share
$
0.89

 
$
0.855

 
$
1.78

 
$
1.71

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