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Equity (Changes In Equity) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Balance at December 31, 2012 $ 13,074  
Balance at December 31, 2012 13,326  
Comprehensive income 252 246
Common stock issued 432  
Share-based compensation expense 19  
Common stock dividends declared (202)  
Preferred stock dividend requirement of subsidiary (3) (3)
Balance at March 31, 2013 13,824  
Balance at March 31, 2013 13,572  
Pacific Gas And Electric Company [Member]
   
Balance at December 31, 2012 13,460  
Comprehensive income 242 241
Common stock issued 0  
Share-based compensation expense (1)  
Common stock dividends declared (179)  
Preferred stock dividend requirement (3) (3)
Equity contributions 370 385
Balance at March 31, 2013 $ 13,889