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Common Stock (Tables)
 9 Months Ended
Sep. 30, 2014
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)
2014
 
2013
 
2014
 
2013
Income from continuing operations attributable to Duke Energy common shareholders
$
887

 
$
942

 
$
2,351

 
$
1,884

Weighted-average shares outstanding - basic
707

 
706

 
707

 
706

Weighted-average shares outstanding - diluted
707
 
706
 
707
 
706
Earnings per share from continuing operations attributable to Duke Energy common shareholders
 
 
 
 
 
 
 
Basic
$
1.25

 
$
1.33

 
$
3.33

 
$
2.67

Diluted
$
1.25

 
$
1.33

 
$
3.33

 
$
2.67

Potentially dilutive items excluded from the calculation(a)
 
 
 
 
2
 
2
Dividends declared per common share
$
0.795

 
$
0.78

 
$
2.355

 
$
2.31

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