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Operating Segments (Operating Segment Data) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sales [Abstract]      
Sales to external parties $ 5,418 $ 5,363 $ 5,405
Inter-segment sales 0 0 0
Total sales 5,418 5,363 5,405
Operating income (loss) [Abstract]      
Operating income attributed to segments 914 937 1,352
General and administrative expenses (261) (321) (350)
Other expenses not allocated to segments and intercompany eliminations (24) (619) (237)
Operating income (loss) 629 (3) 765
Finance expenses, net (124) (132) (108)
Share in earnings of equity-accounted investees 0 18 11
Income (loss) before taxes on income 505 (117) 668
Capital expenditures [Abstract]      
Capital expenditures 504 593 570
Capital expenditures as result of business combination     590
Capital expenditures not allocated 3 59 110
Total capital expenditures 507 652 1,270
Depreciation amortization and impairment [Abstract]      
Depreciation amortization and impairment 388 401 429
Depreciation amortization and impairment not allocated 30 5 1
Total depreciation amortization and impairment 418 406 430
Specialty Solutions Segment [Member]      
Sales [Abstract]      
Sales to external parties 2,588 2,493 2,319
Inter-segment sales 62 60 75
Total sales 2,650 2,553 2,394
Operating income (loss) [Abstract]      
Operating income attributed to segments 554 534 451
Capital expenditures [Abstract]      
Capital expenditures 80 95 98
Capital expenditures as result of business combination     145
Depreciation amortization and impairment [Abstract]      
Depreciation amortization and impairment 111 106 145
Essential Minerals Segment [Member]      
Sales [Abstract]      
Sales to external parties 2,789 2,811 2,904
Inter-segment sales 219 225 211
Total sales 3,008 3,036 3,115
Operating income (loss) [Abstract]      
Operating income attributed to segments 359 398 885
Capital expenditures [Abstract]      
Capital expenditures 423 497 470
Capital expenditures as result of business combination     445
Depreciation amortization and impairment [Abstract]      
Depreciation amortization and impairment 274 292 247
Other activities [Member]      
Sales [Abstract]      
Sales to external parties 41 59 182
Inter-segment sales 2 0 3
Total sales 43 59 185
Operating income (loss) [Abstract]      
Operating income attributed to segments 1 5 16
Capital expenditures [Abstract]      
Capital expenditures 1 1 2
Capital expenditures as result of business combination     0
Depreciation amortization and impairment [Abstract]      
Depreciation amortization and impairment 3 3 37
Eliminations [Member]      
Sales [Abstract]      
Sales to external parties 0 0 0
Inter-segment sales (283) (285) (289)
Total sales $ (283) $ (285) $ (289)