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Equity (Changes In Equity) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Balance at December 31, 2011 $ 12,353  
Comprehensive income 246 211
Common stock issued 393  
Share-based compensation expense 16  
Common stock dividends declared (193)  
Preferred stock dividend requirement of subsidiary (3) (3)
Balance at March 31, 2012 12,812  
Pacific Gas And Electric Company [Member]
   
Balance at December 31, 2011 12,384  
Comprehensive income 241 210
Common stock dividends declared (179)  
Preferred stock dividend requirement (3) (3)
Equity contribution 385 65
Balance at March 31, 2012 $ 12,828