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Provision (Benefit) for Income Taxes (Tables)
6 Months Ended
Jun. 30, 2012
Provision (Benefit) for Income Taxes [Abstract]  
Provision (benefit) for income taxes from continuing operations
      Three months ended Six months ended
      June 30, June 30,
       2012  2011  2012  2011
                 
       (Millions)  (Millions)
Current:            
 Federal  $ 33 $ 59 $ 54 $ 88
 State    4   5   8   8
 Foreign    3   14   24   (6)
        40   78   86   90
Deferred:            
 Federal    30   25   117   (7)
 State    (3)   2   (6)   (1)
 Foreign    4   4   7   5
        31   31   118   (3)
Total provision (benefit) $ 71 $ 109 $ 204 $ 87