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Commitment and Contingencies (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies              
Minimum Power Purchase Obligation $ 200,000,000       $ 200,000,000    
Amount of application under DOE Loan Guarantee Program 2,000,000,000       2,000,000,000    
Potential financing from Japanese export credit agencies under discussion 1,000,000,000       1,000,000,000    
Other (income) (47,500,000) (34,600,000) (10,000,000) (3,700,000) (92,100,000) (3,700,000) (44,400,000)
Contingent commercial ACP license royalty limit         $ 665,000,000