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Inventories (Tables)
3 Months Ended
Mar. 31, 2016
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventory for the periods presented:
Millions of dollars
 
March 31,
2016
 
December 31,
2015
Finished products
 
$
2,557

 
$
2,093

Raw materials and work in process
 
663

 
655

 
 
3,220

 
2,748

Less: excess of FIFO cost over LIFO cost
 
(124
)
 
(129
)
Total inventories
 
$
3,096


$
2,619