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Inventories
 12 Months Ended
Dec. 31, 2015
Inventory, Net [Abstract]  
Inventories
Note 11. Inventories
​ ​ ​
December 31, 
2015
 ​ ​
December 31, 
2014
 ​
Finished products
 ​ ​ ​ $ 613 ​ ​ ​ ​ $ 611 ​ ​
Semi-finished products
 ​ ​ ​ ​ 172 ​ ​ ​ ​ ​ 173 ​ ​
Raw materials, stores and supplies
 ​ ​ ​ ​ 433 ​ ​ ​ ​ ​ 521 ​ ​
Subtotal
 ​ ​ ​ ​ 1,218 ​ ​ ​ ​ ​ 1,305 ​ ​
Adjustment of inventories to LIFO basis
 ​ ​ ​ ​ (246) ​ ​ ​ ​ ​ (253) ​ ​
Total
 ​ ​ ​ $ 972 ​ ​ ​ ​ $ 1,052 ​ ​
​
Inventory values, before LIFO adjustment, are generally determined by the average cost method, which approximates current cost. Inventories are valued using the LIFO method at substantially all of the U.S. locations, which comprised $744 and $684 or 61% and 52% of inventories before the LIFO adjustments at December 31, 2015 and December 31, 2014, respectively. The remainder of inventory held in international locations and certain U.S. locations is valued using the average cost method.