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Inventory (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories Inventories consisted of the following:
millionsSeptember 30, 2020December 31, 2019
Raw materials$63 $75 
Materials and supplies885 974 
Finished goods753 572 
1,701 1,621 
Revaluation to LIFO(41)(40)
Total
$1,660 $1,581