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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
        
          
(In millions)      June 30, 2014 December 31, 2013
            
Original cost      $ 116,377 $ 116,469
Less accumulated depreciation and amortization        (48,477)   (47,642)
Property, plant and equipment – net      $ 67,900 $ 68,827