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Supplemental Data (Summary of Property, Plant and Equipment, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Supplemental Data    
Land $ 173 $ 163
Buildings 2,830 2,612
Machinery and equipment 14,612 13,591
Construction in progress 300 488
Total before accumulated depreciation 17,915 16,854
Less accumulated depreciation (10,479) (9,685)
Total $ 7,436 $ 7,169