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

September 30,
2017

December 31,
2016
Finished products

$
2,729


$
2,070

Raw materials and work in process

715


651



3,444


2,721

Less: excess of FIFO cost over LIFO cost

(99
)

(98
)
Total inventories

$
3,345


$
2,623


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