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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventories    
Raw materials $ 74 $ 65
Materials and supplies 449 446
Finished goods 519 395
Inventories, Gross 1,042 906
Revaluation to LIFO (35) (40)
Total $ 1,007 $ 866