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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, 2019
Dec. 31, 2018
Disclosure of subsidiaries [line items]      
Non-controlling interests   $ 770 $ 134
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   $ 29 32
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   $ 67 59
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   $ 40 33
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 $ 793 $ 634 $ 10
Quebrada Blanca | SSM/SC      
Disclosure of subsidiaries [line items]      
Portion of additional interest acquired 30.00%