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Commitments And Contingencies (Change In Accruals Related To Third-Party Claims) (Details) (Pacific Gas And Electric Company [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pacific Gas And Electric Company [Member]
     
Beginning Balance $ 277 $ 214 $ 0
Loss accrued     220
Additional loss accrued   155  
Less: Payments (34) (92) (6)
Ending Balance $ 243 $ 277 $ 214