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Supplemental Balance Sheet Data - Property Plant and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment    
Land $ 171 $ 163
Buildings 2,744 2,612
Machinery and equipment 14,150 13,591
Construction in progress 324 488
Property, Plant and Equipment, Gross 17,389 16,854
Less accumulated depreciation (10,143) (9,685)
Total $ 7,246 $ 7,169