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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory, Net [Abstract]    
Finished products $ 1,635 $ 1,960
Raw materials and work in process 666 600
Gross inventories $ 2,301 $ 2,560
Percent of LIFO inventory 41.00% 43.00%