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Discontinued Operations and Held For Sale Businesses (Tables)
3 Months Ended
Sep. 30, 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 Nine Months
   Ended September 30, Ended September 30,
   2012 2011 2012 2011
              
   (in millions)
Revenue $ 1 $ 181 $ 48 $ 546
Income (loss) from operations of discontinued businesses $ 1 $ (44) 0 3 $ (66)
Income tax (expense) benefit    2   16   (3)   22
Income (loss) from operations of discontinued            
 businesses, net of tax $ 3 $ (28) $ - $ (44)
Net gain/(loss) on sale and impairments of discontinued             
 operations, net of tax $ (2) $ - $ 68 $ -