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Discontinued Operations and Held For Sale Businesses (Tables)
3 Months Ended
Mar. 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
   Three Months
   Ended March 31,
   2012 2011
        
   (in millions)
Revenue $ 37 $ 197
Income (loss) from operations of discontinued businesses $ 3 $ (10)
Income tax (expense) benefit    (2)   3
Income (loss) from operations of discontinued      
 businesses, net of tax $ 1 $ (7)
Net gain/(loss) on sale and impairments of discontinued operations, net of tax $ (5) $ -