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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventories    
Raw materials $ 66 $ 65
Materials and supplies 452 446
Finished goods 526 395
Inventories, Gross 1,044 906
Revaluation to LIFO (39) (40)
Total $ 1,005 $ 866