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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Unrecognized prior service credit, income tax $ 5 $ 5
Unrecognized net gain, income tax 11 6
Unrecognized net transition obligation, income tax 2 2
Transfer to regulatory account, income tax 15 8
Pacific Gas And Electric Company [Member]
   
Unrecognized prior service credit, income tax 5 5
Unrecognized net gain, income tax 11 6
Unrecognized net transition obligation, income tax 2 2
Transfer to regulatory account, income tax $ 15 $ 8