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Intangible Assets (Composition) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible assets [Line Items]    
Balance at beginning of period $ 824  
Balance at end of period 722 $ 824
Amortized balance at end of period 722 824
Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 1,159 1,488
Additions 17 87
Additions in respect of business combinations from prior year   26
Disposals   (427)
Discontinuance of consolidation (55)  
Translation differences 63 (19)
Reclassification from assets held for sale (117) 4
Balance at end of period 1,067 1,159
Amortized balance at end of period 1,159 1,159
Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 335 303
Amortization for the year 35 36
Disposals   (2)
Translation differences 14 (4)
Impairment 15  
Reclassification from assets held for sale (54) 2
Balance at end of period 345 335
Amortized balance at end of period 335 335
Goodwill [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 377  
Balance at end of period 326 377
Amortized balance at end of period 326 377
Goodwill [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 398 370
Additions 0 0
Additions in respect of business combinations from prior year   26
Disposals   0
Discontinuance of consolidation (55)  
Translation differences 16 2
Reclassification from assets held for sale (11) 0
Balance at end of period 348 398
Amortized balance at end of period 398 398
Goodwill [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 21 21
Amortization for the year 0 0
Disposals   0
Translation differences 1 0
Impairment 0  
Reclassification from assets held for sale 0 0
Balance at end of period 22 21
Amortized balance at end of period 21 21
Concessions and mining rights [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 148  
Balance at end of period 153 148
Amortized balance at end of period 153 148
Concessions and mining rights [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 205 262
Additions 0 1
Additions in respect of business combinations from prior year   0
Disposals   (52)
Discontinuance of consolidation 0  
Translation differences 11 (6)
Reclassification from assets held for sale 0 0
Balance at end of period 216 205
Amortized balance at end of period 205 205
Concessions and mining rights [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 57 52
Amortization for the year 6 5
Disposals   0
Translation differences 0 0
Impairment 0  
Reclassification from assets held for sale 0 0
Balance at end of period 63 57
Amortized balance at end of period 57 57
Trademarks [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 67  
Balance at end of period 67 67
Amortized balance at end of period 67 67
Trademarks [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 86 86
Additions 0 1
Additions in respect of business combinations from prior year   0
Disposals   0
Discontinuance of consolidation 0  
Translation differences 7 (1)
Reclassification from assets held for sale (2) 0
Balance at end of period 91 86
Amortized balance at end of period 86 86
Trademarks [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 19 16
Amortization for the year 3 3
Disposals   0
Translation differences 1 0
Impairment 1  
Reclassification from assets held for sale 0 0
Balance at end of period 24 19
Amortized balance at end of period 19 19
Technology / patents [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 46  
Balance at end of period 45 46
Amortized balance at end of period 45 46
Technology / patents [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 80 82
Additions 3 1
Additions in respect of business combinations from prior year   0
Disposals   0
Discontinuance of consolidation 0  
Translation differences 7 (3)
Reclassification from assets held for sale (10) 0
Balance at end of period 80 80
Amortized balance at end of period 80 80
Technology / patents [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 34 30
Amortization for the year 5 5
Disposals   0
Translation differences 3 (1)
Impairment 0  
Reclassification from assets held for sale (7) 0
Balance at end of period 35 34
Amortized balance at end of period 34 34
Customer relationships [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 126  
Balance at end of period 89 126
Amortized balance at end of period 89 126
Customer relationships [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 214 212
Additions 0 6
Additions in respect of business combinations from prior year   0
Disposals   0
Discontinuance of consolidation 0  
Translation differences 16 (5)
Reclassification from assets held for sale (47) 1
Balance at end of period 183 214
Amortized balance at end of period 214 214
Customer relationships [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 88 77
Amortization for the year 12 13
Disposals   0
Translation differences 5 (2)
Impairment 0  
Reclassification from assets held for sale (11) 0
Balance at end of period 94 88
Amortized balance at end of period 88 88
Exploration and evaluation assets [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 26  
Balance at end of period 14 26
Amortized balance at end of period 14 26
Exploration and evaluation assets [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 35 143
Additions 1 19
Additions in respect of business combinations from prior year   0
Disposals   (126)
Discontinuance of consolidation 0  
Translation differences 3 (1)
Reclassification from assets held for sale 0 0
Balance at end of period 39 35
Amortized balance at end of period 35 35
Exploration and evaluation assets [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 9 7
Amortization for the year 1 2
Disposals   0
Translation differences 1 0
Impairment 14  
Reclassification from assets held for sale 0 0
Balance at end of period 25 9
Amortized balance at end of period 9 9
Computer application [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 8  
Balance at end of period 15 8
Amortized balance at end of period 15 8
Computer application [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 65 255
Additions 10 59
Additions in respect of business combinations from prior year   0
Disposals   (249)
Discontinuance of consolidation 0  
Translation differences 2 (3)
Reclassification from assets held for sale (1) 3
Balance at end of period 76 65
Amortized balance at end of period 65 65
Computer application [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 57 55
Amortization for the year 3 3
Disposals   (2)
Translation differences 2 (1)
Impairment 0  
Reclassification from assets held for sale (1) 2
Balance at end of period 61 57
Amortized balance at end of period 57 57
Other Intangible Assets [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 26  
Balance at end of period 13 26
Amortized balance at end of period 13 26
Other Intangible Assets [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 76 78
Additions 3 0
Additions in respect of business combinations from prior year   0
Disposals   0
Discontinuance of consolidation 0  
Translation differences 1 (2)
Reclassification from assets held for sale (46) 0
Balance at end of period 34 76
Amortized balance at end of period 76 76
Other Intangible Assets [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 50 45
Amortization for the year 5 5
Disposals   0
Translation differences 1 0
Impairment 0  
Reclassification from assets held for sale (35) 0
Balance at end of period 21 50
Amortized balance at end of period $ 50 $ 50