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Supplemental Balance Sheet Data - Property Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment    
Land $ 169 $ 174
Buildings 2,959 2,932
Machinery and equipment 14,514 14,382
Construction in progress 700 845
Property, Plant and Equipment, Gross 18,342 18,333
Less accumulated depreciation (10,378) (10,291)
Total $ 7,964 $ 8,042