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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories
(In millions)September 30, 2021December 31, 2020
Raw materials$631 $416 
Semi-finished products1,055 633 
Finished products345 300 
Supplies and sundry items55 53 
Total$2,086 $1,402