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Impairments (Tables)
12 Months Ended
Dec. 31, 2012
Impairments Tables [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
   2012 2011 2010
   (in millions)
 Wind turbines and projects $ 41 $ 116 $ -
 Kelanitissa   19   42   -
 St. Patrick   11   -   -
 Southland (Huntington Beach)   -   -   200
 Deepwater   -   -   79
 Other   2   15   25
 Total  $ 73 $ 173 $ 304