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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
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Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | $ 11,934 |  | $ 12,564
Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 12,453 |  | 13,214
Intra-segment |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 519 |  | 650
Steelmaking Coal |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 5,522 |  | 6,349
Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 5,522 |  | 6,349
Steelmaking Coal | Intra-segment |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 |  | 0
Copper |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,469 |  | 2,714
Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,469 |  | 2,714
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 | 2,968 |  | 3,094
Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 3,487 |  | 3,744
Zinc | Intra-segment |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 519 |  | 650
Energy |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 975 |  | 407
Energy | Intra-segment |  |  |
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 | 5,522 |  | 6,349
Steelmaking coal | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 5,522 |  | 6,349
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 | Energy | Segment revenues |  |  |
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 | 2,158 |  | 2,242
Copper | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 |  | 0
Copper | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,158 |  | 2,242
Copper | Zinc | 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 | 2,529 |  | 2,980
Zinc | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 |  | 0
Zinc | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 163 |  | 279
Zinc | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 2,366 | $ 2,701 |
Zinc | 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 | 975 |  | 407
Blended bitumen | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 |  | 0
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 | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 975 |  | 407
Silver | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 400 |  | 324
Silver | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 |  | 0
Silver | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 24 |  | 18
Silver | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 376 |  | 306
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 | 400 |  | 419
Lead | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 |  | 0
Lead | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 5 |  | 0
Lead | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 395 |  | 419
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 | 469 |  | 493
Other | Steelmaking Coal | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 0 |  | 0
Other | Copper | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 119 |  | 175
Other | Zinc | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 350 |  | 318
Other | Energy | Segment revenues |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | $ 0 |  | $ 0

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