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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

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