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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventories Inventories consisted of the following:
millionsMarch 31, 2021December 31, 2020
Raw materials$69 $70 
Materials and supplies851 848 
Commodity inventory and finished goods1,282 1,009 
2,202 1,927 
Revaluation to LIFO(29)(29)
Total
$2,173 $1,898