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Supplemental Balance Sheet Data - Property Plant and Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment    
Land $ 170 $ 163
Buildings 2,679 2,612
Machinery and equipment 13,914 13,591
Construction in progress 428 488
Property, Plant and Equipment, Gross 17,191 16,854
Less accumulated depreciation (9,940) (9,685)
Total $ 7,251 $ 7,169