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Supplemental Balance Sheet Data - Property Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment    
Land $ 168 $ 164
Buildings 2,647 2,537
Machinery and equipment 13,723 13,393
Construction in progress 389 453
Property, Plant and Equipment, Gross 16,927 16,547
Less accumulated depreciation (9,729) (9,443)
Total $ 7,198 $ 7,104