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Inventory (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories Inventories consisted of the following:
millionsJune 30, 2020December 31, 2019
Raw materials$70  $75  
Materials and supplies945  974  
Commodity inventory and finished goods503  572  
 1,518  1,621  
Revaluation to LIFO(41) (40) 
Total
$1,477  $1,581