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Inventories
 3 Months Ended
Mar. 31, 2017
Inventory, Net [Abstract]  
Inventories
Inventories 
 
March 31,
2017
December 31,
2016
Finished products
$
2,953

$
3,113

Semi-finished products
1,838

2,009

Raw materials, stores and supplies
669

719

 
5,460

5,841

Adjustment of inventories to a last-in, first-out (LIFO) basis
(173
)
(168
)
Total
$
5,287

$
5,673