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Discontinued Operations and Held For Sale Businesses (Tables)
12 Months Ended
Dec. 31, 2011
Discontinued Operations And Held For Sale Business Tables [Abstract]  
Summary Of Income And Loss On Disposal And Impairment For Discontinued Operations
Gain (Loss) on Disposal of Discontinued Businesses         
          
  Year ended December 31,
Subsidiary 2011 2010 2009
          
  (in millions)
Argentina distribution businesses $ (338) $ - $ -
Brazil Telecom   446   -   -
Wind projects   (22)   -   -
Barka   -   80   -
Lal Pir   -   (6)   (74)
Pak Gen   -   (16)   (76)
Ras Laffan   -   6   -
Gain (loss) on disposal, after taxes $ 86 $ 64 $ (150)
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
  Year ended December 31,
  2011 2010 2009
          
  (in millions)
Revenue $ 485 $ 1,310 $ 1,579
Income (loss) from operations of discontinued businesses, before taxes $ (124) $ (745) $ 146
Income tax (expense) benefit   27   270   (45)
Income (loss) from operations of discontinued businesses, after taxes $ (97) $ (475) $ 101
Gain (loss) on disposal of discontinued businesses, after taxes $ 86 $ 64 $ (150)