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Inventories
 3 Months Ended
Mar. 31, 2020
Inventory, Net [Abstract]  
Inventories INVENTORIES
The following table summarizes our inventories at March 31, 2020 and December 31, 2019:
Millions of dollars

March 31, 2020

December 31, 2019
Finished products

$
2,063


$
1,979

Raw materials and work in process

619


602



2,682


2,581

Less: excess of FIFO cost over LIFO cost

(139
)

(143
)
Total inventories

$
2,543


$
2,438


LIFO inventories represented 42% and 43% of total inventories at March 31, 2020 and December 31, 2019, respectively.