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Supplemental Data (Summary of Property, Plant and Equipment, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Supplemental Data    
Land $ 169 $ 174
Buildings 2,993 2,932
Machinery and equipment 14,606 14,382
Construction in progress 760 845
Total before accumulated depreciation 18,528 18,333
Less accumulated depreciation (10,431) (10,291)
Total $ 8,097 $ 8,042