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Operating Segments (Operating Income by Business Lines) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating segment data [Line Items]      
Operating income attributed to segments $ 914 $ 937 $ 1,352
Industrial Products [Member]      
Operating segment data [Line Items]      
Operating income attributed to segments 303 286 225
Advanced Additives [Member]      
Operating segment data [Line Items]      
Operating income attributed to segments 201 163 154
Food Specialties [Member]      
Operating segment data [Line Items]      
Operating income attributed to segments 51 84 72
Potash & Magnesium [Member]      
Operating segment data [Line Items]      
Operating income attributed to segments 282 282 637
Phosphate [Member]      
Operating segment data [Line Items]      
Operating income attributed to segments 23 60 187
Specialty Fertilizers [Member]      
Operating segment data [Line Items]      
Operating income attributed to segments 56 55 63
Other activities and intercompany eliminations [Member]      
Operating segment data [Line Items]      
Operating income attributed to segments $ (2) $ 7 $ 14