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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 69 $ 70
Materials and supplies 851 848
Commodity inventory and finished goods 1,282 1,009
Inventories, gross 2,202 1,927
Revaluation to LIFO (29) (29)
Total $ 2,173 $ 1,898