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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Line Items]  
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.
 
Years Ended December 31,
(in millions, except per share amounts)
2014

 
2013

 
2012

Income from continuing operations attributable to Duke Energy common shareholders excluding impact of participating securities
2,446

 
2,565

 
1,588

Weighted-average shares outstanding - basic
707

 
706

 
574

Stock options, performance and restricted shares
—

 
—

 
1

Weighted-average shares outstanding - diluted
707

 
706

 
575

Earnings per share from continuing operations attributable to Duke Energy common shareholders
 
 
 
 
 
Basic
$
3.46

 
3.64

 
2.77

Diluted
$
3.46

 
3.63

 
2.77

Potentially dilutive items excluded from the calculation(a)
2

 
2

 
1

Dividends declared per common share
$
3.15

 
3.09

 
3.03

(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.