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Equity (Changes in Equity) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Balance at December 31, 2010     $ 11,534  
Balance at December 31, 2010     11,282  
Net Income 366 337 568 598
Common stock issued     269  
Share-based compensation expense     24  
Common stock dividends declared     (365)  
Preferred stock dividend requirement        
Preferred stock dividend requirement of subsidiary (4) (4) (7) (7)
Other comprehensive income     18  
Balance at June 30, 2011 12,041   12,041  
Balance at June 30, 2011 11,789   11,789  
Pacific Gas and Electric Company [Member]
       
Balance at December 31, 2010     11,721  
Net Income     560  
Common stock issued        
Share-based compensation expense        
Common stock dividends declared     (358)  
Preferred stock dividend requirement (4) (4) (7) (7)
Other comprehensive income     18  
Equity contribution     255  
Balance at June 30, 2011 $ 12,189   $ 12,189