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Inventories
 6 Months Ended
Jun. 30, 2017
Inventory, Net [Abstract]  
Inventories
INVENTORIES
The following table summarizes our inventory for the periods presented:
Millions of dollars

June 30,
2017

December 31,
2016
Finished products

$
2,636


$
2,070

Raw materials and work in process

689


651



3,325


2,721

Less: excess of FIFO cost over LIFO cost

(95
)

(98
)
Total inventories

$
3,230


$
2,623


LIFO inventories represented 37% of total inventories at June 30, 2017 and December 31, 2016.