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Condensed Consolidated Statements Of Cash Flows (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash Flows from Financing Activities    
Net (repayments) issuances of commercial paper, discount $ 1 $ 1
Pacific Gas And Electric Company [Member]
   
Cash Flows from Financing Activities    
Net (repayments) issuances of commercial paper, discount $ 1 $ 1