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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventory at June 30, 2019 and December 31, 2018:
Millions of dollars

June 30, 2019

December 31, 2018
Finished products

$
2,547


$
2,076

Raw materials and work in process

618


617



3,165


2,693

Less: excess of FIFO cost over LIFO cost

(157
)

(160
)
Total inventories

$
3,008


$
2,533