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Commitments And Contingencies (Schedule Of Capacity Payments Due Under The QF Contracts Discount) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Maximum [Member]
Qualifying Facilities [Member]
Dec. 31, 2011
Minimum [Member]
Qualifying Facilities [Member]
Long-term Purchase Commitment [Line Items]        
2012 $ 50      
2013 50      
2014 42      
2015 38      
2016 36      
Thereafter 89      
Total fixed capacity payments 305      
Less: amount representing interest 57      
Present value of fixed capacity payments 248      
Capital lease expiration dates of contracts     September 2021 April 2014
Present value of fixed capacity payments, portion classified as current liabilities 36 34    
Present value of fixed capacity payments, portion classified as noncurrent liabilities 212 248    
Capitalized asset for fixed capacity payments for corresponding assets 248 282    
Capitalized asset for fixed capacity payments, accumulated amortization $ 160 $ 126