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Commitments - Additional Information (Detail)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2007
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of commitments [line items]            
Amount expected to be incurred     $ 724      
Expected period     1 year 1 year    
Amount on lease rentals     $ 118   $ 113  
Royalty expense     370   453  
Within one year [member]            
Disclosure of commitments [line items]            
Amount expected to be incurred     638      
Within two to five years [member]            
Disclosure of commitments [line items]            
Amount expected to be incurred     86      
Office premises [member]            
Disclosure of commitments [line items]            
Amount on lease rentals     13   13  
Mining equipment [member]            
Disclosure of commitments [line items]            
Amount on lease rentals     66   60  
Rail facilities [member]            
Disclosure of commitments [line items]            
Amount on lease rentals     6   12  
Road and port facilities [member]            
Disclosure of commitments [line items]            
Amount on lease rentals     $ 33   28  
Trail Operations [member]            
Disclosure of commitments [line items]            
Purchase commitment per year       $ 75    
Purchase commitment percentage increase per year     2.00% 2.00%    
QB2 [member]            
Disclosure of commitments [line items]            
Amount expected to be incurred     $ 562      
Steelmaking Coal Operations [member]            
Disclosure of commitments [line items]            
Amount expected to be incurred     113      
Antamina [member]            
Disclosure of commitments [line items]            
Amount expected to be incurred     $ 49      
Ownership interest in joint operation     22.50% 22.50%    
Royalty percentage     7.40% 7.40%    
Royalty expense     $ 25   $ 28  
Red Dog Road and Port lease [member] | Over Next Four Years [member]            
Disclosure of commitments [line items]            
Minimum annual user fee       $ 18    
Red Dog Road and Port lease [member] | Over next eighteen years [member]            
Disclosure of commitments [line items]            
Minimum annual user fee       6    
Red Dog Road and Port lease [member] | Over twenty two years [member]            
Disclosure of commitments [line items]            
Total remaining user fee       $ 173    
Red Dog Royalty [member]            
Disclosure of commitments [line items]            
Royalty percentage 35.00% 25.00% 35.00% 35.00%    
Maximum net proceeds of production royalty     50.00% 50.00%    
Increase in net proceeds of production royalty     5.00% 5.00%    
Royalty expense       $ 252   $ 324
Top of range [member]            
Disclosure of commitments [line items]            
Capital expenditure commitments expected period     5 years 5 years    
Lease term     17 years 17 years    
Bottom of range [member]            
Disclosure of commitments [line items]            
Capital expenditure commitments expected period     2 years 2 years