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Consolidated Statements Of Equity (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Tax (expense) benefit from employee stock plans $ 9 $ 25 $ 8
Pacific Gas And Electric Company [Member]
     
Tax (expense) benefit from employee stock plans $ 5 $ 25 $ 10