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Intangible Assets (Composition) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Intangible assets [Line Items]    
Balance at beginning of period $ 722  
Balance at end of period 671 $ 722
Amortized balance at end of period 671 722
Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 1,067 1,159
Additions 16 17
Disposals (2)  
Discontinuance of consolidation   (55)
Translation differences (40) 63
Reclassification to assets held for sale 0 (117)
Balance at end of period 1,041 1,067
Amortized balance at end of period 1,067 1,067
Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 345 335
Disposals (1)  
Amortization for the year 30 35
Translation differences (10) 14
Impairment 6 15
Reclassification to assets held for sale   (54)
Balance at end of period 370 345
Amortized balance at end of period 345 345
Goodwill [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 326  
Balance at end of period 309 326
Amortized balance at end of period 309 326
Goodwill [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 348 398
Additions 0 0
Disposals 0  
Discontinuance of consolidation   (55)
Translation differences (17) 16
Reclassification to assets held for sale 0 (11)
Balance at end of period 331 348
Amortized balance at end of period 348 348
Goodwill [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 22 21
Disposals 0  
Amortization for the year 0 0
Translation differences 0 1
Impairment 0 0
Reclassification to assets held for sale   0
Balance at end of period 22 22
Amortized balance at end of period 22 22
Concessions and mining rights [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 153  
Balance at end of period 142 153
Amortized balance at end of period 142 153
Concessions and mining rights [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 216 205
Additions 0 0
Disposals 0  
Discontinuance of consolidation   0
Translation differences (6) 11
Reclassification to assets held for sale 0 0
Balance at end of period 210 216
Amortized balance at end of period 216 216
Concessions and mining rights [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 63 57
Disposals 0  
Amortization for the year 5 6
Translation differences 0 0
Impairment 0 0
Reclassification to assets held for sale   0
Balance at end of period 68 63
Amortized balance at end of period 63 63
Trademarks [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 67  
Balance at end of period 62 67
Amortized balance at end of period 62 67
Trademarks [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 91 86
Additions 0 0
Disposals 0  
Discontinuance of consolidation   0
Translation differences (3) 7
Reclassification to assets held for sale 0 (2)
Balance at end of period 88 91
Amortized balance at end of period 91 91
Trademarks [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 24 19
Disposals 0  
Amortization for the year 3 3
Translation differences (1) 1
Impairment 0 1
Reclassification to assets held for sale   0
Balance at end of period 26 24
Amortized balance at end of period 24 24
Technology / patents [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 45  
Balance at end of period 36 45
Amortized balance at end of period 36 45
Technology / patents [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 80 80
Additions 1 3
Disposals 0  
Discontinuance of consolidation   0
Translation differences (6) 7
Reclassification to assets held for sale 0 (10)
Balance at end of period 75 80
Amortized balance at end of period 80 80
Technology / patents [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 35 34
Disposals 0  
Amortization for the year 5 5
Translation differences (4) 3
Impairment 3 0
Reclassification to assets held for sale   (7)
Balance at end of period 39 35
Amortized balance at end of period 35 35
Customer relationships [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 89  
Balance at end of period 73 89
Amortized balance at end of period 73 89
Customer relationships [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 183 214
Additions 0 0
Disposals 0  
Discontinuance of consolidation   0
Translation differences (5) 16
Reclassification to assets held for sale 0 (47)
Balance at end of period 178 183
Amortized balance at end of period 183 183
Customer relationships [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 94 88
Disposals 0  
Amortization for the year 10 12
Translation differences (2) 5
Impairment 3 0
Reclassification to assets held for sale   (11)
Balance at end of period 105 94
Amortized balance at end of period 94 94
Exploration and evaluation assets [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 14  
Balance at end of period 14 14
Amortized balance at end of period 14 14
Exploration and evaluation assets [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 39 35
Additions 1 1
Disposals 0  
Discontinuance of consolidation   0
Translation differences (1) 3
Reclassification to assets held for sale 0 0
Balance at end of period 39 39
Amortized balance at end of period 39 39
Exploration and evaluation assets [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 25 9
Disposals 0  
Amortization for the year 1 1
Translation differences (1) 1
Impairment 0 14
Reclassification to assets held for sale   0
Balance at end of period 25 25
Amortized balance at end of period 25 25
Computer application [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 15  
Balance at end of period 24 15
Amortized balance at end of period 24 15
Computer application [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 76 65
Additions 13 10
Disposals 0  
Discontinuance of consolidation   0
Translation differences (2) 2
Reclassification to assets held for sale 0 (1)
Balance at end of period 87 76
Amortized balance at end of period 76 76
Computer application [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 61 57
Disposals 0  
Amortization for the year 4 3
Translation differences (2) 2
Impairment 0 0
Reclassification to assets held for sale   (1)
Balance at end of period 63 61
Amortized balance at end of period 61 61
Other Intangible Assets [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 13  
Balance at end of period 11 13
Amortized balance at end of period 11 13
Other Intangible Assets [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 34 76
Additions 1 3
Disposals (2)  
Discontinuance of consolidation   0
Translation differences 0 1
Reclassification to assets held for sale 0 (46)
Balance at end of period 33 34
Amortized balance at end of period 34 34
Other Intangible Assets [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 21 50
Disposals (1)  
Amortization for the year 2 5
Translation differences 0 1
Impairment 0 0
Reclassification to assets held for sale   (35)
Balance at end of period 22 21
Amortized balance at end of period $ 21 $ 21