Property, Plant and Equipment, Net of Accumulated Depreciation (Property, Net) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment	$ 24,826	$ 22,430
Accumulated depreciation	(10,809)	(9,884)
Total	14,017	12,546
Land [Member]
Property, plant and equipment	482	435
Building [Member]
Property, plant and equipment	5,864	5,540
Equipment [Member]
Property, plant and equipment	16,648	14,973
Construction in Progress [Member]
Property, plant and equipment	$ 1,832	$ 1,482