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Revenues - Summary of Revenue Disaggregated by Major Product Type and by Business Unit (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | $ 8,948 | $ 11,934 |
Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 9,412 | 12,453 |
Intra-segment |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 464 | 519 |
Copper |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,419 | 2,469 |
Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,419 | 2,469 |
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 | 2,700 | 2,968 |
Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 3,164 | 3,487 |
Zinc | Intra-segment |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 464 | 519 |
Steelmaking Coal |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 3,375 | 5,522 |
Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 3,375 | 5,522 |
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 | 454 | 975 |
Energy | Intra-segment |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,119 | 2,158 |
Copper | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,119 | 2,158 |
Copper | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Copper | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Copper | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,251 | 2,529 |
Zinc | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 189 | 163 |
Zinc | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,062 | 2,366 |
Zinc | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Zinc | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Steelmaking coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 3,375 | 5,522 |
Steelmaking coal | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Steelmaking coal | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Steelmaking coal | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 3,375 | 5,522 |
Steelmaking coal | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Blended bitumen | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 454 | 975 |
Blended bitumen | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Blended bitumen | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 |  | $ 0
Blended bitumen | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Blended bitumen | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 454 | 975 |
Silver | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 467 | 400 |
Silver | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 35 | 24 |
Silver | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 432 | 376 |
Silver | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Silver | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Lead | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 361 | 400 |
Lead | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 5 | 5 |
Lead | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 356 | 395 |
Lead | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Lead | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Other | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 385 | 469 |
Other | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 71 | 119 |
Other | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 314 | 350 |
Other | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 | 0 |
Other | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | $ 0 | $ 0 |

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