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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 |  |

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