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Inventories
 12 Months Ended
Dec. 31, 2019
Inventory, Net [Abstract]  
Inventories INVENTORIES
The following table summarizes our inventories at December 31, 2019 and 2018:
Millions of dollars
 
2019
 
2018
Finished products
 
$
1,979

 
$
2,076

Raw materials and work in process
 
602

 
617

 
 
2,581

 
2,693

Less: excess of FIFO cost over LIFO cost
 
(143
)
 
(160
)
Total inventories
 
$
2,438


$
2,533


LIFO inventories represented 43% and 41% of total inventories at December 31, 2019 and 2018, respectively.