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Revenue - Summary of Revenue Disaggregated by Major Product Type and by Business Unit (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | $ 13,481 | $ 8,948
Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 13,992 | 9,412
Intra-segment |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | (511) | (464)
Copper |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,452 | 2,419
Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,452 | 2,419
Copper | Intra-segment |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Zinc |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,063 | 2,700
Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,574 | 3,164
Zinc | Intra-segment |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | (511) | (464)
Steelmaking Coal |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 6,251 | 3,375
Steelmaking Coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 6,251 | 3,375
Steelmaking Coal | Intra-segment |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Energy |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 715 | 454
Energy | Intra-segment |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,066 | 2,119
Copper | Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 3,066 | 2,119
Copper | Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Copper | Steelmaking Coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Copper | Energy | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 2,622 | 2,251
Zinc | Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 286 | 189
Zinc | Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 2,336 | 2,062
Zinc | Steelmaking Coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Zinc | Energy | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Steelmaking coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 6,251 | 3,375
Steelmaking coal | Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Steelmaking coal | Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Steelmaking coal | Steelmaking Coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 6,251 | 3,375
Steelmaking coal | Energy | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Blended bitumen | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 715 | 454
Blended bitumen | Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Blended bitumen | Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Blended bitumen | Steelmaking Coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Blended bitumen | Energy | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 715 | 454
Silver | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 495 | 467
Silver | Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 41 | 35
Silver | Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 454 | 432
Silver | Steelmaking Coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Silver | Energy | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Lead | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 445 | 361
Lead | Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 6 | 5
Lead | Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 439 | 356
Lead | Steelmaking Coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Lead | Energy | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Other | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 398 | 385
Other | Copper | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 53 | 71
Other | Zinc | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 345 | 314
Other | Steelmaking Coal | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 0 | 0
Other | Energy | Segment revenue |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | $ 0 | $ 0

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