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Transactions - Additional Information (Detail)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure of significant transactions [line items]        
Assets held for sale       $ 350
Quebrada Blanca SA [member] | ENAMI [member]        
Disclosure of significant transactions [line items]        
Proportion of ownership interest held by non-controlling interest   10.00% 10.00%  
Quebrada Blanca SA [member] | Inversiones Mineras S A [member]        
Disclosure of significant transactions [line items]        
Cash paid   $ 67    
Total fair value   175    
Total fair value   16    
Decrease in equity   $ 159    
Inversiones Mineras S A [member]        
Disclosure of significant transactions [line items]        
Proportion of additional interest in subsidiary 13.50%      
Compania Mineras Teck Quebrada Blanca SA [member] | Bottom of range [member]        
Disclosure of significant transactions [line items]        
Proportion of ownership interest in subsidiary 76.50%      
Compania Mineras Teck Quebrada Blanca SA [member] | Top of range [member]        
Disclosure of significant transactions [line items]        
Proportion of ownership interest in subsidiary 90.00%      
QB2 project [member] | Quebrada Blanca SA [member]        
Disclosure of significant transactions [line items]        
Subsequent proportion of ownership interest in subsidiary   60.00% 60.00%  
QB2 project [member] | Quebrada Blanca SA [member] | Sumitomo [member]        
Disclosure of significant transactions [line items]        
Subscription for interest   30.00% 30.00%  
Subsequent proportion of ownership interest held by noncontrolling interest   30.00% 30.00%  
QB2 project [member] | Inversiones Mineras S A [member]        
Disclosure of significant transactions [line items]        
Cash paid     $ 53  
QB2 project [member] | Inversiones Mineras S A [member] | Social and environmental impact assessment [member]        
Disclosure of significant transactions [line items]        
Cash paid     60  
QB2 project [member] | Inversiones Mineras S A [member] | Commencement of commercial production [member]        
Disclosure of significant transactions [line items]        
Cash payable     $ 50  
Cash payable period   30 days 30 days  
Additional amounts may payable to extent average copper prices exceed per pound in each first three years   3.15 3.15  
Cumulative maximum amount if occurs prior to Jan 21, 2024     $ 100  
Waneta Dam [member]        
Disclosure of significant transactions [line items]        
Percentage of sales interest in asset   66.67% 66.67%  
Assets held for sale       $ 350
Term power agreement period   20 years 20 years  
Additional term power arrangement period   10 years 10 years  
Proceeds from sale of asset   $ 1,203,000    
Waneta Dam [member] | Pretax [member]        
Disclosure of significant transactions [line items]        
Gain on disposal net of transaction costs   888    
Waneta Dam [member] | After tax [member]        
Disclosure of significant transactions [line items]        
After tax gain on disposal net of transaction costs   $ 812