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Discontinued Operations and Held For Sale Businesses (Tables)
12 Months Ended
Dec. 31, 2012
Discontinued Operations And Held For Sale Business Tables [Abstract]  
Revenue Income From Operations Of Discontinued Businesses Income Tax Expense And Impairment Of Discontinued Operations
  Year ended December 31,
  2012 2011 2010
          
  (in millions)
Revenue $ 66 $ 836 $ 1,695
Loss from operations of discontinued businesses, before income tax $ (10) $ (157) $ (770)
Income tax (expense) benefit   (3)   26   284
Loss from operations of discontinued businesses, after income tax $ (13) $ (131) $ (486)
Gain (loss) on disposal of discontinued businesses, after income tax $ 16 $ 86 $ 64