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Fair Value Measurements (Carrying Amount And Fair Value Of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Carrying Amount [Member]
   
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Debt financial instrument $ 350 $ 349
Carrying Amount [Member] | Pacific Gas And Electric Company [Member]
   
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Debt financial instrument 12,334 11,645
Estimate Of Fair Value [Member]
   
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Debt financial instrument 354 371
Estimate Of Fair Value [Member] | Pacific Gas And Electric Company [Member]
   
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Debt financial instrument $ 13,444 $ 13,946