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Related Party Agreements And Transactions (Tables)
 12 Months Ended
Dec. 31, 2012
Related Party Agreements And Transactions [Abstract]  
Schedule Of Significant Related Party Transactions
 
Year Ended December 31, 
(in millions)
2012
 
2011
 
2010
Utility revenues from:
 
 
 
 
 
Administrative services provided to PG&E Corporation
$
7      
      
$
6      
      
$
7      
Utility expenses from:
      
      
      
      
      
      
      
      
Administrative services received from PG&E
      
      
      
      
      
      
      
      
Corporation
$
50      
      
$
49      
      
$
55      
Utility employee benefit due to PG&E Corporation
      
51      
      
      
33      
      
      
27