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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Inventories    
Raw materials $ 69 $ 71
Materials and supplies 601 585
Finished goods 541 485
Inventories, Gross 1,211 1,141
Revaluation to LIFO (89) (89)
Total $ 1,122 $ 1,052