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Property, Plant And Equipment (Property, Plant And Equipment, Net) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Property, Plant And Equipment [Abstract]    
Property, plant and equipment $ 26,274 $ 27,657
Less: Accumulated depreciation (13,301) (13,470)
Property, plant and equipment, net $ 12,973 $ 14,187