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Supplemental Balance Sheet Data - Property Plant and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment    
Land $ 169 $ 173
Buildings 2,791 2,830
Machinery and equipment 14,120 14,612
Construction in progress 383 300
Property, Plant and Equipment, Gross 17,463 17,915
Less accumulated depreciation (10,417) (10,479)
Total $ 7,046 $ 7,436