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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventories at September 30, 2020 and December 31, 2019:
Millions of dollarsSeptember 30, 2020December 31, 2019
Finished products$1,708 $1,979 
Raw materials and work in process627 602 
2,335 2,581 
Less: excess of FIFO cost over LIFO cost(119)(143)
Total inventories$2,216 $2,438