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Impairments (Tables)
3 Months Ended
Sep. 30, 2012
Impairments Tables [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
  Three Months Ended Nine Months Ended
  September 30, September 30,
  2012 2011 2012 2011
             
  (in millions)
Wind turbines and projects $ 36 $ 116 $ 40 $ 116
Kelanitissa   5   4   17   37
St. Patrick   -   -   11   -
Other   2   10   4   10
Total asset impairment expense $ 43 $ 130 $ 72 $ 163