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Commitment and Contingencies (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Commitments and Contingencies    
Minimum Power Purchase Obligation   $ 300,000,000
Maximum DOE RD&D program contribution 300,000,000  
Interim RD&D funding 44,000,000  
Amount of application under DOE Loan Guarantee Program   2,000,000,000
ACP spending reduction in October 2011   30.00%
Upper range of potential ACP asset impairment expense   1,100,000,000
Estimated maximum potential severance liability   14,000,000
Estimated maximum potential severance liability, DOE share   $ 9,000,000