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Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
 At
 September 30, December 31,
(In millions)2012 2011
      
Original cost$ 111,043 $ 108,117
Less accumulated depreciation and amortization  (43,655)   (42,378)
Property, plant and equipment – net$ 67,388 $ 65,739