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Derivatives (Volumes Of Outstanding Derivative Contracts) (Details)
Mar. 31, 2012
Derivative [Line Items]  
Derivatives expiration, lower (year) 2017
Derivatives expiration, higher (year) 2022
Forwards And Swaps [Member] | Natural Gas [Member]
 
Derivative [Line Items]  
Less Than 1 Year 439,441,427 [1],[2],[3]
Greater Than 1 Year but Less Than 3 Years 166,878,481 [1],[2],[3]
Greater Than 3 Years but Less Than 5 Years 4,280,000 [1],[2],[3]
Forwards And Swaps [Member] | Electricity [Member]
 
Derivative [Line Items]  
Less Than 1 Year 4,141,223 [1]
Greater Than 1 Year but Less Than 3 Years 4,696,221 [1]
Greater Than 3 Years but Less Than 5 Years 2,009,505 [1]
Greater Than 5 Years 3,421,832 [1],[4]
Options [Member] | Natural Gas [Member]
 
Derivative [Line Items]  
Less Than 1 Year 231,380,020 [1]
Greater Than 1 Year but Less Than 3 Years 280,200,000 [1]
Options [Member] | Electricity [Member]
 
Derivative [Line Items]  
Less Than 1 Year 1,248,000 [1]
Greater Than 1 Year but Less Than 3 Years 140,510 [1]
Greater Than 3 Years but Less Than 5 Years 239,233 [1]
Greater Than 5 Years 218,013 [1],[4]
Congestion Revenue Rights [Member] | Electricity [Member]
 
Derivative [Line Items]  
Less Than 1 Year 75,532,338 [1]
Greater Than 1 Year but Less Than 3 Years 73,123,024 [1]
Greater Than 3 Years but Less Than 5 Years 73,190,271 [1]
Greater Than 5 Years 54,209,541 [1],[4]
[1] Amounts shown reflect the total gross derivative volumes by commodity type that are expected to settle in each time period.
[2] Amounts shown are for the combined positions of the electric fuels and core gas portfolios.
[3] Million British Thermal Units.
[4] Derivatives in this category expire between 2017 and 2022.