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Segmented Information - Schedule of Operating Segments (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | $ 8,948 | $ 11,934
Cost of sales | (7,615) | (8,594)
Gross profit | 1,333 | 3,340
Asset impairments (Note 8(a)) | (1,244) | (2,690)
Other operating expenses | (999) | (800)
Profit (loss) from operations | (910) | (150)
Net finance income (expense) | (268) | (218)
Non-operating income (expense) | 43 | (97)
Share of gain (loss) of associates and joint ventures | (1) | (3)
Profit (loss) before taxes | (1,136) | (468)
Capital expenditures | 3,628 | 3,468
Goodwill | 1,093 | 1,101
Total assets | 41,278 | 39,350
Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 9,412 | 12,453
Less intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 464 | 519
Copper |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 2,419 | 2,469
Cost of sales | (1,560) | (1,852)
Gross profit | 859 | 617
Asset impairments (Note 8(a)) | 0 | (31)
Other operating expenses | (323) | (183)
Profit (loss) from operations | 536 | 403
Net finance income (expense) | (151) | (119)
Non-operating income (expense) | 38 | 50
Share of gain (loss) of associates and joint ventures | 1 | (2)
Profit (loss) before taxes | 424 | 332
Capital expenditures | 1,990 | 1,757
Goodwill | 391 | 399
Total assets | 14,546 | 12,740
Copper | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 2,419 | 2,469
Copper | Less intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 0 | 0
Zinc |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 2,700 | 2,968
Cost of sales | (2,177) | (2,367)
Gross profit | 523 | 601
Asset impairments (Note 8(a)) | 0 | 0
Other operating expenses | (98) | (63)
Profit (loss) from operations | 425 | 538
Net finance income (expense) | (44) | (47)
Non-operating income (expense) | (4) | (9)
Share of gain (loss) of associates and joint ventures | 0 | 0
Profit (loss) before taxes | 377 | 482
Capital expenditures | 247 | 307
Goodwill | 0 | 0
Total assets | 4,006 | 3,904
Zinc | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 3,164 | 3,487
Zinc | Less intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 464 | 519
Steelmaking Coal |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 3,375 | 5,522
Cost of sales | (3,098) | (3,410)
Gross profit | 277 | 2,112
Asset impairments (Note 8(a)) | 0 | (289)
Other operating expenses | (193) | (136)
Profit (loss) from operations | 84 | 1,687
Net finance income (expense) | (56) | (60)
Non-operating income (expense) | 13 | (15)
Share of gain (loss) of associates and joint ventures | 0 | 0
Profit (loss) before taxes | 41 | 1,612
Capital expenditures | 1,284 | 1,197
Goodwill | 702 | 702
Total assets | 17,266 | 16,032
Steelmaking Coal | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 3,375 | 5,522
Steelmaking Coal | Less intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 0 | 0
Energy |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 454 | 975
Cost of sales | (780) | (965)
Gross profit | (326) | 10
Asset impairments (Note 8(a)) | (1,244) | (2,370)
Other operating expenses | (28) | (26)
Profit (loss) from operations | (1,598) | (2,386)
Net finance income (expense) | (26) | (27)
Non-operating income (expense) | 0 | (2)
Share of gain (loss) of associates and joint ventures | 0 | 0
Profit (loss) before taxes | (1,624) | (2,415)
Capital expenditures | 91 | 191
Goodwill | 0 | 0
Total assets | 2,658 | 3,916
Energy | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 454 | 975
Energy | Less intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 0 | 0
Corporate |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 0 | 0
Cost of sales | 0 | 0
Gross profit | 0 | 0
Asset impairments (Note 8(a)) | 0 | 0
Other operating expenses | (357) | (392)
Profit (loss) from operations | (357) | (392)
Net finance income (expense) | 9 | 35
Non-operating income (expense) | (4) | (121)
Share of gain (loss) of associates and joint ventures | (2) | (1)
Profit (loss) before taxes | (354) | (479)
Capital expenditures | 16 | 16
Goodwill | 0 | 0
Total assets | 2,802 | 2,758
Corporate | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | 0 | 0
Corporate | Less intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues (Note 6(a)) | $ 0 | $ 0

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