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Supplemental Data (Summary of Property, Plant and Equipment, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Supplemental Data    
Land $ 169 $ 173
Buildings 2,787 2,830
Machinery and equipment 14,059 14,612
Construction in progress 699 300
Total before accumulated depreciation 17,714 17,915
Less accumulated depreciation (10,555) (10,479)
Total $ 7,159 $ 7,436