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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory, Net [Abstract]  
Summary of Inventories
The following table summarizes our inventories at December 31, 2017 and 2016:
Millions of dollars
 
2017
 
2016
Finished products
 
$
2,374

 
$
2,070

Raw materials and work in process
 
725

 
651

 
 
3,099

 
2,721

Less: excess of FIFO cost over LIFO cost
 
(111
)
 
(98
)
Total inventories
 
$
2,988


$
2,623