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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2012
Earnings Per Share [Abstract]  
Reconciliation Of PG&E Corporation's Income Available For Common Shareholders And Weighted Average Common Shares Outstanding For Calculating Diluted EPS
     Three Months Ended  
     March 31,  
(in millions, except per share amounts)    2012      2011  
Diluted              

Income available for common shareholders

    $ 233      $ 199   

Weighted average common shares outstanding, basic

      414        396   

Add incremental shares from assumed conversions:

      

Employee share-based compensation

      2        1   
  

 

 

     

 

 

  

Weighted average common shares outstanding, diluted

      416        397   
  

 

 

     

 

 

  

Total earnings per common share, diluted

    $  0.56      $  0.50