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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory, Net [Abstract]  
Summary of Inventories
The following table summarizes our inventories at December 31, 2018 and 2017:
Millions of dollars
 
2018
 
2017
Finished products
 
$
2,076

 
$
2,374

Raw materials and work in process
 
617

 
725

 
 
2,693

 
3,099

Less: excess of FIFO cost over LIFO cost
 
(160
)
 
(111
)
Total inventories
 
$
2,533


$
2,988