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Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventory for the periods presented:
Millions of dollars

March 31, 2018

December 31, 2017
Finished products

$
2,716


$
2,374

Raw materials and work in process

745


725



3,461


3,099

Less: excess of FIFO cost over LIFO cost

(115
)

(111
)
Total inventories

$
3,346


$
2,988