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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories Inventories consisted of the following at December 31:
millions20202019
Raw materials$70 $75 
Materials and supplies848 974 
Commodity inventory and finished goods1,009 572 
1,927 1,621 
Revaluation to LIFO(29)(40)
Total$1,898 $1,581