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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventory Net [Abstract]    
Finished products $ 589 $ 701
Semi-finished products 189 195
Raw materials, stores, and supplies 559 476
Inventories before LIFO adjustment 1,337 1,372
Less: Adjustment of inventories to LIFO basis (258) (225)
Total inventories $ 1,079 $ 1,147