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Equity (Narrative) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
May 02, 2013
Dec. 31, 2012
Jun. 30, 2013
Pacific Gas And Electric Company [Member]
Jun. 30, 2012
Pacific Gas And Electric Company [Member]
Dec. 31, 2012
Pacific Gas And Electric Company [Member]
Jun. 30, 2013
Equity Contract [Member]
May 02, 2013
Equity Contract [Member]
Jun. 30, 2013
Underwritten Public Offering [Member]
Jun. 30, 2013
Four Zero One K Plan DRSPP and Share Based Compensation Plans [Member]
Common Stock Shares Issued             3,000,000   7,000,000 4,000,000
Common Stock Value $ 9,032   $ 8,428 $ 1,322   $ 1,322 $ 113 $ 50 $ 300 $ 149
Equity distribution agreement amount   400                
Net of fees and commissions             1      
Common equity ratio percentage 52.00%                  
Debt and preferred stock ratio percentage 48.00%                  
Equity contribution       $ 665 $ 565