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Fair Value Measurements Fair Value Measurements, Assets Held for Sale (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Impaired Long-Lived Assets Held and Used [Line Items]     
Loss on assets held for sale$ 148$ 0$ 148$ 0 
Assets held for sale1,092 1,092 0
Liabilities associated with assets held for sale596 596 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Discontinued Hedges, Net  (21)  
Assets Held For Sale, Income Statement Location [Member]
     
Impaired Long-Lived Assets Held and Used [Line Items]     
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Discontinued Hedges, Net  (30)  
Assets Held For Sale, Income Statement Location [Member] | Cash Flow Hedging [Member]
     
Impaired Long-Lived Assets Held and Used [Line Items]     
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Discontinued Hedges, Net(30)    
Cash Flow Hedging [Member]
     
Impaired Long-Lived Assets Held and Used [Line Items]     
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Discontinued Hedges, Net(21)    
Natural Gas Processing Plant [Member]
     
Impaired Long-Lived Assets Held and Used [Line Items]     
Property, plant and equipment - net856 856  
Current assets147 147  
Natural gas fired generating facilities capacity2,152 2,152  
Loss on assets held for sale148    
Disposal Group, Not Discontinued Operation, Loss on Write Down, After Tax97    
Assets held for sale1,092 1,092  
Other assets89 89  
Long-term debt488 488  
Current liabilities87 87  
Other liabilities and deferred credits21 21  
Assets Held For Sale Derivativies12 12  
Derivative Liabilities Of Assets Held For Sale28 28  
Liabilities associated with assets held for sale$ 596 $ 596