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Common Stock (Tables)
 6 Months Ended
Jun. 30, 2015
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)
2015

 
2014

 
2015
 
2014
Income from continuing operations attributable to Duke Energy common shareholders
$
600

 
$
720

 
$
1,372

 
$
1,464

Weighted-average shares outstanding – basic
692

 
707

 
700

 
707

Weighted-average shares outstanding – diluted
692
 
707
 
700
 
707
Earnings per share from continuing operations attributable to Duke Energy common shareholders
 
 
 
 
 
 
 
Basic
$
0.87

 
$
1.02

 
$
1.96

 
$
2.07

Diluted
$
0.87

 
$
1.02

 
$
1.96

 
$
2.07

Potentially dilutive shares excluded from the calculation(a)
2

 
2

 
2
 
2
Dividends declared per common share
$
0.795

 
$
0.78

 
$
1.59

 
$
1.56

(a)
Performance stock awards and certain stock options were not included in the dilutive securities calculation because either the performance measures related to the awards had not yet been met, or the option exercise prices were greater than the average market price of the common shares during the presented periods.