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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories consisted of the following:
millionsSeptember 30, 2021December 31, 2020
Raw materials$75 $70 
Materials and supplies843 848 
Commodity inventory and finished goods884 1,009 
1,802 1,927 
Revaluation to LIFO(29)(29)
Total
$1,773 $1,898