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Inventories
9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following:
 
September 30,
2017
 
December 31,
2016
 
(in millions)
Finished goods
$
277

 
$
279

Raw materials, spare parts and supplies
39

 
60

Total inventories
$
316

 
$
339