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Non-Controlling Interests - Summary of Information About Subsidiaries with Non-controlling Interests and Non-controlling Interest Balances (Detail) - CAD ($)
$ in Millions
12 Months Ended
Mar. 29, 2019
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2020
Disclosure of subsidiaries [line items]        
Non-controlling interests   $ 768   $ 669
Carmen de Andacollo        
Disclosure of subsidiaries [line items]        
Percentage of Ownership Interest Held by Non-Controlling Interest   10.00%    
Percentage of Voting Rights Held by Non-Controlling Interest   10.00%    
Non-controlling interests   $ 24   26
Elkview Mine Limited Partnership        
Disclosure of subsidiaries [line items]        
Percentage of Ownership Interest Held by Non-Controlling Interest   5.00%    
Percentage of Voting Rights Held by Non-Controlling Interest   5.00%    
Non-controlling interests   $ 86   74
Compañía Minera Zafranal S.A.C.        
Disclosure of subsidiaries [line items]        
Percentage of Ownership Interest Held by Non-Controlling Interest   20.00%    
Percentage of Voting Rights Held by Non-Controlling Interest   20.00%    
Non-controlling interests   $ 46   43
Quebrada Blanca        
Disclosure of subsidiaries [line items]        
Percentage of Ownership Interest Held by Non-Controlling Interest   40.00%    
Percentage of Voting Rights Held by Non-Controlling Interest   40.00%    
Non-controlling interests   $ 612   $ 526
Quebrada Blanca | SSM/SC        
Disclosure of subsidiaries [line items]        
Portion of additional interest acquired 30.00%      
Quebrada Blanca | ENAMI        
Disclosure of subsidiaries [line items]        
Percentage of Ownership Interest Held by Non-Controlling Interest     10.00%