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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories consisted of the following:
millionsJune 30, 2021December 31, 2020
Raw materials$71 $70 
Materials and supplies878 848 
Commodity inventory and finished goods917 1,009 
1,866 1,927 
Revaluation to LIFO(29)(29)
Total
$1,837 $1,898