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Inventories
6 Months Ended
Jun. 30, 2018
Inventory, Net [Abstract]  
Inventories
INVENTORIES
The following table summarizes our inventory for the periods presented:
Millions of dollars

June 30, 2018

December 31, 2017
Finished products

$
2,524


$
2,374

Raw materials and work in process

634


725



3,158


3,099

Less: excess of FIFO cost over LIFO cost

(126
)

(111
)
Total inventories

$
3,032


$
2,988


LIFO inventories represented 43% and 38% of total inventories at June 30, 2018 and December 31, 2017, respectively.