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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory, net [Abstract]    
Finished products and parts $ 1,330 $ 1,865
Raw materials and supplies 952 1,147
Work in process 67 127
Total 2,349 3,139
Obsolescence reserves $ 150 $ 149