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Inventory (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories Inventories consisted of the following:
millionsMarch 31, 2020December 31, 2019
Raw materials$69  $75  
Materials and supplies902  879  
Commodity inventory and finished goods505  533  
 1,476  1,487  
Revaluation to LIFO(40) (40) 
Total
$1,436  $1,447