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Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventory at March 31, 2019 and December 31, 2018:
Millions of dollars

March 31, 2019

December 31, 2018
Finished products

$
2,506


$
2,076

Raw materials and work in process

614


617



3,120


2,693

Less: excess of FIFO cost over LIFO cost

(160
)

(160
)
Total inventories

$
2,960


$
2,533