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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) |

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