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Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended
Mar. 20, 2012
Mar. 31, 2012
Mar. 31, 2012
Pacific Gas And Electric Company [Member]
Mar. 31, 2011
Pacific Gas And Electric Company [Member]
Stock issued during period for stock options exercised and under 401(K) plan and DRSPP   3,363,617    
Cash proceeds from employee stock options exercised   $ 133    
Net of fees and commissions   1    
Equity distribution agreement amount   219    
Sale of common stock in an underwritten public offering 5,900,000      
Cash proceeds from sale of common shares in an underwritten public offering 254      
Equity contribution     $ 385 $ 65
Common equity ratio percentage   52.00%    
Debt and preferred stock ratio percentage   48.00%