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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Inventories    
Raw materials $ 77 $ 73
Materials and supplies 504 568
Finished goods 466 395
Inventories, Gross 1,047 1,036
Revaluation to LIFO (50) (50)
Total $ 997 $ 986