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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventory, Net [Abstract]  
Schedule of Inventory
The following table summarizes our inventory for the periods presented:
Millions of dollars
 
March 31,
2015
 
December 31,
2014
Finished products
 
$
2,275

 
$
2,189

Raw materials and work in process
 
888

 
724

 
 
3,163

 
2,913

Less: excess of FIFO cost over LIFO cost
 
(161
)
 
(173
)
Total inventories
 
$
3,002


$
2,740