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Inventories (Tables)
6 Months Ended
Jun. 30, 2011
Inventory, Net [Abstract]  
Schedule of Inventory
Millions of dollars
 
June 30,

2011
 
December 31,

2010
Finished products
 
$
2,599


 
$
2,314


Raw materials and work in process
 
631


 
627


 
 
3,230


 
2,941


Less excess of FIFO cost over LIFO cost
 
(159
)
 
(149
)
Total inventories
 
$
3,071




$
2,792