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Intangible Assets (Composition) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Intangible assets [Line Items]    
Balance at beginning of period $ 652  
Balance at end of period 670 $ 652
Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 1,046 1,041
Additions 21 18
Additions in respect of business combinations 26  
Exit from consolidation (15)  
Translation differences 29 (13)
Balance at end of period 1,107 1,046
Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 394 370
Exit from consolidation (5)  
Amortization for the year 28 28
Translation differences 15 (4)
Impairment of intangible assets 5  
Balance at end of period 437 394
Goodwill [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 302  
Balance at end of period 320 302
Goodwill [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 323 331
Additions 0 0
Additions in respect of business combinations 18  
Exit from consolidation 0  
Translation differences 0 (8)
Balance at end of period 341 323
Goodwill [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 21 22
Exit from consolidation 0  
Amortization for the year 0 0
Translation differences 0 (1)
Impairment of intangible assets 0  
Balance at end of period 21 21
Concessions and mining rights [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 139  
Balance at end of period 144 139
Concessions and mining rights [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 209 210
Additions 0 0
Additions in respect of business combinations 0  
Exit from consolidation 0  
Translation differences 9 (1)
Balance at end of period 218 209
Concessions and mining rights [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 70 68
Exit from consolidation 0  
Amortization for the year 2 2
Translation differences 2 0
Impairment of intangible assets 0  
Balance at end of period 74 70
Trademarks [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 58  
Balance at end of period 58 58
Trademarks [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 86 88
Additions 0 0
Additions in respect of business combinations 0  
Exit from consolidation 0  
Translation differences 6 (2)
Balance at end of period 92 86
Trademarks [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 28 26
Exit from consolidation 0  
Amortization for the year 3 3
Translation differences 3 (1)
Impairment of intangible assets 0  
Balance at end of period 34 28
Technology / patents [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 32  
Balance at end of period 27 32
Technology / patents [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 75 75
Additions 0 0
Additions in respect of business combinations 0  
Exit from consolidation (5)  
Translation differences 5 0
Balance at end of period 75 75
Technology / patents [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 43 39
Exit from consolidation (2)  
Amortization for the year 4 5
Translation differences 3 (1)
Impairment of intangible assets 0  
Balance at end of period 48 43
Customer relationships [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 62  
Balance at end of period 49 62
Customer relationships [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 176 178
Additions 0 0
Additions in respect of business combinations 1  
Exit from consolidation (10)  
Translation differences 5 (2)
Balance at end of period 172 176
Customer relationships [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 114 105
Exit from consolidation (3)  
Amortization for the year 9 10
Translation differences 3 (1)
Impairment of intangible assets 0  
Balance at end of period 123 114
Exploration and evaluation assets [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 18  
Balance at end of period 14 18
Exploration and evaluation assets [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 44 39
Additions 2 5
Additions in respect of business combinations 0  
Exit from consolidation 0  
Translation differences 2 0
Balance at end of period 48 44
Exploration and evaluation assets [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 26 25
Exit from consolidation 0  
Amortization for the year 1 1
Translation differences 2 0
Impairment of intangible assets 5  
Balance at end of period 34 26
Computer application [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 31  
Balance at end of period 42 31
Computer application [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 99 87
Additions 18 12
Additions in respect of business combinations 0  
Exit from consolidation 0  
Translation differences 1 0
Balance at end of period 118 99
Computer application [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 68 63
Exit from consolidation 0  
Amortization for the year 7 5
Translation differences 1 0
Impairment of intangible assets 0  
Balance at end of period 76 68
Other Intangible Assets [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 10  
Balance at end of period 16 10
Other Intangible Assets [Member] | Gross [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 34 33
Additions 1 1
Additions in respect of business combinations 7  
Exit from consolidation 0  
Translation differences 1 0
Balance at end of period 43 34
Other Intangible Assets [Member] | Accumulated impairment [Member]    
Intangible assets [Line Items]    
Balance at beginning of period 24 22
Exit from consolidation 0  
Amortization for the year 2 2
Translation differences 1 0
Impairment of intangible assets 0  
Balance at end of period $ 27 $ 24