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Discontinued Operations (Tables)
6 Months Ended
Jun. 30, 2011
Discontinued Operations [Abstract]  
Summarized Results of Discontinued Operations
                                 
    Three months ended     Six months ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
    (Millions)  
Revenues
  $ 4     $ 4     $ 7     $ 9  
 
                       
 
                               
Income (loss) from discontinued operations before impairments and income taxes
  $     $ (2 )   $ (2 )   $ 2  
Impairments
    (2 )           (11 )      
(Provision) benefit for income taxes
    (1 )     (1 )     2       (3 )
 
                       
Income (loss) from discontinued operations
  $ (3 )   $ (3 )   $ (11 )   $ (1 )