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Segmented Information - Schedule of Operating Segments (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Revenues CAD 12,048 CAD 9,300  
Cost of sales (7,419) (6,904)  
Gross profit (loss) 4,629 2,396  
Asset impairments 163 (294)  
Other operating income (expenses) (459) (377)  
Profit (loss) from operations 4,333 1,725  
Net finance expense (212) (338)  
Non-operating income (expense) (151) 239  
Share of income of associates and joint ventures 6 2  
Profit (loss) before taxes 3,976 1,628  
Capital expenditures 2,299 1,893  
Goodwill 1,087 1,114 CAD 1,127
Total assets 37,058 35,629  
Net assets 19,525 17,601  
Segment revenues [member]      
Disclosure of operating segments [line items]      
Revenues 12,683 9,730  
Inter-segment revenues [member]      
Disclosure of operating segments [line items]      
Revenues (635) (430)  
Steelmaking Coal [member]      
Disclosure of operating segments [line items]      
Revenues 6,152 4,144  
Cost of sales (3,108) (2,765)  
Gross profit (loss) 3,044 1,379  
Asset impairments 207    
Other operating income (expenses) (99) (74)  
Profit (loss) from operations 3,152 1,305  
Net finance expense (5) (21)  
Non-operating income (expense) (29) 6  
Profit (loss) before taxes 3,118 1,290  
Capital expenditures 673 348  
Goodwill 702 702  
Total assets 15,271 14,894  
Net assets 9,759 10,071  
Steelmaking Coal [member] | Segment revenues [member]      
Disclosure of operating segments [line items]      
Revenues 6,152 4,144  
Copper [member]      
Disclosure of operating segments [line items]      
Revenues 2,400 2,007  
Cost of sales (1,782) (1,817)  
Gross profit (loss) 618 190  
Asset impairments (44)    
Other operating income (expenses) 63 35  
Profit (loss) from operations 637 225  
Net finance expense (45) (42)  
Non-operating income (expense) 5 (5)  
Share of income of associates and joint ventures 3 2  
Profit (loss) before taxes 600 180  
Capital expenditures 467 339  
Goodwill 385 412  
Total assets 9,533 9,673  
Net assets 5,748 6,029  
Copper [member] | Segment revenues [member]      
Disclosure of operating segments [line items]      
Revenues 2,400 2,007  
Zinc [member]      
Disclosure of operating segments [line items]      
Revenues 3,496 3,147  
Cost of sales (2,529) (2,317)  
Gross profit (loss) 967 830  
Asset impairments   (46)  
Other operating income (expenses) (28) 30  
Profit (loss) from operations 939 814  
Net finance expense (31) (27)  
Non-operating income (expense) (9) (5)  
Profit (loss) before taxes 899 782  
Capital expenditures 244 190  
Total assets 3,720 3,742  
Net assets 2,335 2,464  
Zinc [member] | Segment revenues [member]      
Disclosure of operating segments [line items]      
Revenues 4,131 3,577  
Zinc [member] | Inter-segment revenues [member]      
Disclosure of operating segments [line items]      
Revenues (635) (430)  
Energy [member]      
Disclosure of operating segments [line items]      
Revenues   2  
Cost of sales   (5)  
Gross profit (loss)   (3)  
Asset impairments   (248)  
Other operating income (expenses) (3) (30)  
Profit (loss) from operations (3) (281)  
Net finance expense (7) (6)  
Profit (loss) before taxes (10) (287)  
Capital expenditures 911 1,010  
Total assets 5,667 4,129  
Net assets 4,656 3,648  
Energy [member] | Segment revenues [member]      
Disclosure of operating segments [line items]      
Revenues   2  
Corporate [member]      
Disclosure of operating segments [line items]      
Other operating income (expenses) (392) (338)  
Profit (loss) from operations (392) (338)  
Net finance expense (124) (242)  
Non-operating income (expense) (118) 243  
Share of income of associates and joint ventures 3    
Profit (loss) before taxes (631) (337)  
Capital expenditures 4 6  
Total assets 2,867 3,191  
Net assets CAD (2,973) CAD (4,611)