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Inventories
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories include:
 
March 31, 2014
 
December 31, 2013
($ in millions)
 
Finished products
$
1,245

 
$
1,156

Work in process
168

 
160

Raw materials
454

 
440

Supplies
62

 
68

Total
$
1,929

 
$
1,824


Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 38% of total inventories at March 31, 2014 and December 31, 2013. If the first-in, first-out method of inventory valuation had been used, inventories would have been $186 million and $195 million higher as of March 31, 2014 and December 31, 2013, respectively.