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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventory for the periods presented:
Millions of dollars

March 31,
2017

December 31,
2016
Finished products

$
2,489


$
2,070

Raw materials and work in process

684


651



3,173


2,721

Less: excess of FIFO cost over LIFO cost

(97
)

(98
)
Total inventories

$
3,076


$
2,623