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Resolution Of Remaining Chapter 11 Disputed Claims (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Resolution Of Remaining Chapter Eleven Disputed Claims [Line Items]    
Escrow for payment of remaining net disputed claims $ 320 $ 320
Balance at December 31, 2011 848  
Interest accrued 7  
Less: electricity supplier settlements (23)  
Balance at March 31, 2012 832  
Interest accrued on disputed claims 668  
Pacific Gas And Electric Company [Member]
   
Resolution Of Remaining Chapter Eleven Disputed Claims [Line Items]    
Balance at March 31, 2012 832  
Remaining disputed claims 658  
CAISO And PX [Member]
   
Resolution Of Remaining Chapter Eleven Disputed Claims [Line Items]    
Carrying amounts due from CAISO and PX as of the balance sheet date for disputed claims related to the Chapter 11 Filing $ 494