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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory Net [Abstract]    
Finished products $ 579 $ 589
Semi-finished products 180 189
Raw materials, stores, and supplies 433 559
Inventories before LIFO adjustment 1,192 1,337
Less: Adjustment of inventories to LIFO basis (253) (258)
Total inventories $ 939 $ 1,079