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Commitments and contingencies - Associates - Cerro Verde (Details)
S/ in Billions, $ in Billions
 12 Months Ended
Jan. 05, 2021
installment
Jun. 23, 2004
Dec. 31, 2021
PEN (S/)
Dec. 31, 2021
USD ($)
SUNAT.        
Disclosure of Commitments and contingencies [Line Items]        
Number Of Equal Monthly Payments 66      
SUNAT. | Sociedad Minera Cerro Verde S.A.A. | December 2006 to December 2013        
Disclosure of Commitments and contingencies [Line Items]        
Payment of Litigation Settlement Amount     S/ 2.9 $ 791.9
Minimum | Sociedad Minera Cerro Verde S.A.A.        
Disclosure of Commitments and contingencies [Line Items]        
Royalty rate on net sales   1.00%    
Maximum | Sociedad Minera Cerro Verde S.A.A.        
Disclosure of Commitments and contingencies [Line Items]        
Royalty rate on net sales   3.00%    
New guarantee contract | Sociedad Minera Cerro Verde S.A.A.        
Disclosure of Commitments and contingencies [Line Items]        
Royalty rate on net sales   1.00%    
New guarantee contract | Minimum | Sociedad Minera Cerro Verde S.A.A.        
Disclosure of Commitments and contingencies [Line Items]        
Royalty rate on net sales   1.00%    
New guarantee contract | Maximum | Sociedad Minera Cerro Verde S.A.A.        
Disclosure of Commitments and contingencies [Line Items]        
Royalty rate on net sales   12.00%