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Intangible Assets (Composition) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Intangible assets [Line Items]    
Balance at beginning of period $ 671  
Balance at end of period 652 $ 671
Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 1,041 1,067
Additions 18 16
Disposals   (2)
Translation differences (13) (40)
Balance at end of period 1,046 1,041
Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 370 345
Disposals   (1)
Amortization for the year 28 30
Translation differences (4) (10)
Impairment of intangible assets   6
Balance at end of period 394 370
Goodwill [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 309  
Balance at end of period 302 309
Goodwill [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 331 348
Additions 0 0
Disposals   0
Translation differences (8) (17)
Balance at end of period 323 331
Goodwill [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 22 22
Disposals   0
Amortization for the year 0 0
Translation differences (1) 0
Impairment of intangible assets   0
Balance at end of period 21 22
Concessions and mining rights [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 142  
Balance at end of period 139 142
Concessions and mining rights [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 210 216
Additions 0 0
Disposals   0
Translation differences (1) (6)
Balance at end of period 209 210
Concessions and mining rights [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 68 63
Disposals   0
Amortization for the year 2 5
Translation differences 0 0
Impairment of intangible assets   0
Balance at end of period 70 68
Trademarks [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 62  
Balance at end of period 58 62
Trademarks [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 88 91
Additions 0 0
Disposals   0
Translation differences (2) (3)
Balance at end of period 86 88
Trademarks [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 26 24
Disposals   0
Amortization for the year 3 3
Translation differences (1) (1)
Impairment of intangible assets   0
Balance at end of period 28 26
Technology / patents [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 36  
Balance at end of period 32 36
Technology / patents [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 75 80
Additions 0 1
Disposals   0
Translation differences 0 (6)
Balance at end of period 75 75
Technology / patents [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 39 35
Disposals   0
Amortization for the year 5 5
Translation differences (1) (4)
Impairment of intangible assets   3
Balance at end of period 43 39
Customer relationships [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 73  
Balance at end of period 62 73
Customer relationships [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 178 183
Additions 0 0
Disposals   0
Translation differences (2) (5)
Balance at end of period 176 178
Customer relationships [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 105 94
Disposals   0
Amortization for the year 10 10
Translation differences (1) (2)
Impairment of intangible assets   3
Balance at end of period 114 105
Exploration and evaluation assets [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 14  
Balance at end of period 18 14
Exploration and evaluation assets [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 39 39
Additions 5 1
Disposals   0
Translation differences 0 (1)
Balance at end of period 44 39
Exploration and evaluation assets [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 25 25
Disposals   0
Amortization for the year 1 1
Translation differences 0 (1)
Impairment of intangible assets   0
Balance at end of period 26 25
Computer application [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 24  
Balance at end of period 31 24
Computer application [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 87 76
Additions 12 13
Disposals   0
Translation differences 0 (2)
Balance at end of period 99 87
Computer application [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 63 61
Disposals   0
Amortization for the year 5 4
Translation differences 0 (2)
Impairment of intangible assets   0
Balance at end of period 68 63
Other Intangible Assets [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 11  
Balance at end of period 10 11
Other Intangible Assets [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 33 34
Additions 1 1
Disposals   (2)
Translation differences 0 0
Balance at end of period 34 33
Other Intangible Assets [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 22 21
Disposals   (1)
Amortization for the year 2 2
Translation differences 0 0
Impairment of intangible assets   0
Balance at end of period $ 24 $ 22