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Supplemental Balance Sheet Data - Property Plant and Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment    
Land $ 168 $ 169
Buildings 2,814 2,787
Machinery and equipment 14,194 14,059
Construction in progress 648 699
Property, Plant and Equipment, Gross 17,824 17,714
Less accumulated depreciation (10,685) (10,555)
Total $ 7,139 $ 7,159