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Earnings Per Share
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Earnings Per Share

12. EARNINGS PER COMMON SHARE (EPS)

Basic Earnings Per Share (EPS) is computed by dividing net income attributable to Duke Energy common shareholders, adjusted for distributed and undistributed earnings allocated to participating securities, by the weighted-average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income attributable to Duke Energy common shareholders, as adjusted for distributed and undistributed earnings allocated to participating securities, by the diluted weighted-average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as stock options, phantom shares and stock-based performance unit awards were exercised or settled.

On July 2, 2012, just prior to the close of the merger with Progress Energy, Duke Energy executed a one-for-three reverse stock split. All earnings per share amounts included in this Form 10-Q are presented as if the one-for-three reverse stock split had been effective January 1, 2012. 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.

          
(In millions, except per-share amounts)Income Average Shares EPS
Three Months Ended March 31, 2013        
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic and diluted$ 629   705 $ 0.89
Three Months Ended March 31, 2012        
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic and diluted$ 292   446 $ 0.65
          

As of March 31, 2013, and 2012, 1 million of stock options and performance and unvested stock awards were not included in the dilutive securities calculation in the above table 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.