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Segmented Information - Schedule of Operating Segments (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]        
Revenues $ 12,564 $ 11,910    
Cost of sales (7,943) (7,343)    
Gross profit (loss) 4,621 4,567    
Impairment reversal and (asset impairments) (41) 163    
Other operating income (expenses) 204 (459)    
Profit (loss) from operations 4,784 4,271    
Net finance expense (219) (212)    
Non-operating income (expense) (52) (151)    
Share of income (loss) of associates and joint ventures (3) 6    
Profit (loss) before taxes 4,510 3,914    
Capital expenditures 2,613 2,299    
Goodwill 1,121 1,087 $ 1,114 $ 1,114
Total assets 39,626 37,028 $ 35,629  
Segment revenues [member]        
Disclosure of operating segments [line items]        
Revenues 13,214 12,545    
Inter-segment revenues [member]        
Disclosure of operating segments [line items]        
Revenues (650) (635)    
Steelmaking Coal [member]        
Disclosure of operating segments [line items]        
Revenues 6,349 6,014    
Cost of sales (3,309) (3,000)    
Gross profit (loss) 3,040 3,014    
Impairment reversal and (asset impairments)   207    
Other operating income (expenses) (79) (99)    
Profit (loss) from operations 2,961 3,122    
Net finance expense (47) (5)    
Non-operating income (expense) 37 (29)    
Profit (loss) before taxes 2,951 3,088    
Capital expenditures 969 673    
Goodwill 702 702    
Total assets 15,491 15,241    
Steelmaking Coal [member] | Segment revenues [member]        
Disclosure of operating segments [line items]        
Revenues 6,349 6,014    
Copper [member]        
Disclosure of operating segments [line items]        
Revenues 2,714 2,400    
Cost of sales (1,837) (1,814)    
Gross profit (loss) 877 586    
Impairment reversal and (asset impairments) (10) (44)    
Other operating income (expenses) (247) 63    
Profit (loss) from operations 620 605    
Net finance expense (47) (45)    
Non-operating income (expense) 4 5    
Share of income (loss) of associates and joint ventures (2) 3    
Profit (loss) before taxes 575 568    
Capital expenditures 850 467    
Goodwill 419 385    
Total assets 10,219 9,533    
Copper [member] | Segment revenues [member]        
Disclosure of operating segments [line items]        
Revenues 2,242 2,022    
Zinc [member]        
Disclosure of operating segments [line items]        
Revenues 3,094 3,496    
Cost of sales (2,225) (2,529)    
Gross profit (loss) 869 967    
Impairment reversal and (asset impairments) (31)      
Other operating income (expenses) 826 (28)    
Profit (loss) from operations 1,664 939    
Net finance expense (37) (31)    
Non-operating income (expense) 11 (9)    
Profit (loss) before taxes 1,638 899    
Capital expenditures 409 244    
Total assets 3,692 3,720    
Zinc [member] | Segment revenues [member]        
Disclosure of operating segments [line items]        
Revenues 2,980 2,925    
Zinc [member] | Inter-segment revenues [member]        
Disclosure of operating segments [line items]        
Revenues (650) (635)    
Energy [member]        
Disclosure of operating segments [line items]        
Revenues 407      
Cost of sales (572)      
Gross profit (loss) (165)      
Other operating income (expenses) 1 (3)    
Profit (loss) from operations (164) (3)    
Net finance expense (16) (7)    
Profit (loss) before taxes (180) (10)    
Capital expenditures 375 911    
Total assets 6,131 5,667    
Energy [member] | Segment revenues [member]        
Disclosure of operating segments [line items]        
Revenues 407      
Corporate [member]        
Disclosure of operating segments [line items]        
Other operating income (expenses) (297) (392)    
Profit (loss) from operations (297) (392)    
Net finance expense (72) (124)    
Non-operating income (expense) (104) (118)    
Share of income (loss) of associates and joint ventures (1) 3    
Profit (loss) before taxes (474) (631)    
Capital expenditures 10 4    
Total assets $ 4,093 $ 2,867