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Segmented Information - Schedule of Operating Segments (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |
Revenues | $ 11,934 | $ 12,564
Cost of sales | (8,594) | (7,943)
Gross profit | 3,340 | 4,621
Asset impairments | (2,690) | (41)
Other operating expenses | (800) | 204
Profit (loss) from operations | (150) | 4,784
Net finance income (expense) | (218) | (219)
Non-operating income (expense) | (97) | (52)
Share of loss of associates and joint ventures | (3) | (3)
Profit (loss) before taxes | (468) | 4,510
Capital expenditures | 3,468 | 2,613
Goodwill | 1,101 | 1,121
Total assets | 39,350 | 39,626
Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 12,453 | 13,214
Less: Intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 519 | 650
Steelmaking Coal |  |
Disclosure of operating segments [line items] |  |
Revenues | 5,522 | 6,349
Cost of sales | (3,410) | (3,309)
Gross profit | 2,112 | 3,040
Asset impairments | (289) | 0
Other operating expenses | (136) | (79)
Profit (loss) from operations | 1,687 | 2,961
Net finance income (expense) | (60) | (47)
Non-operating income (expense) | (15) | 37
Share of loss of associates and joint ventures | 0 | 0
Profit (loss) before taxes | 1,612 | 2,951
Capital expenditures | 1,197 | 969
Goodwill | 702 | 702
Total assets | 16,032 | 15,491
Steelmaking Coal | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 5,522 | 6,349
Steelmaking Coal | Less: Intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 0 | 0
Copper |  |
Disclosure of operating segments [line items] |  |
Revenues | 2,469 | 2,714
Cost of sales | (1,852) | (1,837)
Gross profit | 617 | 877
Asset impairments | (31) | (10)
Other operating expenses | (183) | (247)
Profit (loss) from operations | 403 | 620
Net finance income (expense) | (119) | (47)
Non-operating income (expense) | 50 | 4
Share of loss of associates and joint ventures | (2) | (2)
Profit (loss) before taxes | 332 | 575
Capital expenditures | 1,757 | 850
Goodwill | 399 | 419
Total assets | 12,740 | 10,400
Copper | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 2,469 | 2,714
Copper | Less: Intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 0 | 0
Zinc |  |
Disclosure of operating segments [line items] |  |
Revenues | 2,968 | 3,094
Cost of sales | (2,367) | (2,225)
Gross profit | 601 | 869
Asset impairments | 0 | (31)
Other operating expenses | (63) | 820
Profit (loss) from operations | 538 | 1,658
Net finance income (expense) | (47) | (37)
Non-operating income (expense) | (9) | 11
Share of loss of associates and joint ventures | 0 | 0
Profit (loss) before taxes | 482 | 1,632
Capital expenditures | 307 | 411
Goodwill | 0 | 0
Total assets | 3,904 | 3,754
Zinc | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 3,487 | 3,744
Zinc | Less: Intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 519 | 650
Energy |  |
Disclosure of operating segments [line items] |  |
Revenues | 975 | 407
Cost of sales | (965) | (572)
Gross profit | 10 | (165)
Asset impairments | (2,370) | 0
Other operating expenses | (26) | 1
Profit (loss) from operations | (2,386) | (164)
Net finance income (expense) | (27) | (16)
Non-operating income (expense) | (2) | 0
Share of loss of associates and joint ventures | 0 | 0
Profit (loss) before taxes | (2,415) | (180)
Capital expenditures | 191 | 375
Goodwill | 0 | 0
Total assets | 3,916 | 6,131
Energy | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 975 | 407
Energy | Less: Intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 0 | 0
Corporate |  |
Disclosure of operating segments [line items] |  |
Revenues | 0 | 0
Cost of sales | 0 | 0
Gross profit | 0 | 0
Asset impairments | 0 | 0
Other operating expenses | (392) | (291)
Profit (loss) from operations | (392) | (291)
Net finance income (expense) | 35 | (72)
Non-operating income (expense) | (121) | (104)
Share of loss of associates and joint ventures | (1) | (1)
Profit (loss) before taxes | (479) | (468)
Capital expenditures | 16 | 8
Goodwill | 0 | 0
Total assets | 2,758 | 3,850
Corporate | Segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | 0 | 0
Corporate | Less: Intra-segment revenues |  |
Disclosure of operating segments [line items] |  |
Revenues | $ 0 | $ 0

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