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Inventories
12 Months Ended
Dec. 31, 2020
Inventory, Net [Abstract]  
Inventories INVENTORIES
The following table summarizes our inventories at December 31, 2020 and 2019:
Millions of dollars20202019
Finished products$1,635 $1,960 
Raw materials and work in process666 600 
Total inventories$2,301 $2,560 
Effective January 1, 2021, the Company changed its accounting principle for inventory valuation and discontinued the use of the last-in, first-out ("LIFO") method and adopted the first-in, first-out ("FIFO") method of inventory in the U.S.
As of December 31, 2020 and 2019, LIFO inventories would have represented 41% and 43% of total inventories.
See Note 1 to the consolidated financial statements for additional information of the effect of the change.