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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, 2018 | Dec. 31, 2017
Disclosure of products and services [line items] |  |
Revenue | $ 12,564 | $ 11,910
Steelmaking Coal [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 6,349 | 6,014
Copper [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 2,714 | 2,400
Zinc [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 3,094 | 3,496
Segment revenues [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 13,214 | 12,545
Segment revenues [member] | Steelmaking Coal [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 6,349 | 6,014
Segment revenues [member] | Copper [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 2,242 | 2,022
Segment revenues [member] | Zinc [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 2,980 | 2,925
Segment revenues [member] | Silver [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 324 | 572
Segment revenues [member] | Lead [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 419 | 570
Segment revenues [member] | Blended bitumen [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 407 |
Segment revenues [member] | Other Segments [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 493 | 442
Inter-segment revenues [member] |  |
Disclosure of products and services [line items] |  |
Revenue | (650) | (635)
Inter-segment revenues [member] | Zinc [member] |  |
Disclosure of products and services [line items] |  |
Revenue | (650) | (635)
Steelmaking Coal [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 6,349 | 6,014
Steelmaking Coal [member] | Segment revenues [member] | Steelmaking Coal [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 6,349 | 6,014
Copper [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 2,714 | 2,400
Copper [member] | Segment revenues [member] | Copper [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 2,242 | 2,022
Copper [member] | Segment revenues [member] | Zinc [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 279 | 252
Copper [member] | Segment revenues [member] | Silver [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 18 | 16
Copper [member] | Segment revenues [member] | Other Segments [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 175 | 110
Zinc [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 3,094 | 3,496
Zinc [member] | Segment revenues [member] | Zinc [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 2,701 | 2,673
Zinc [member] | Segment revenues [member] | Silver [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 306 | 556
Zinc [member] | Segment revenues [member] | Lead [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 419 | 570
Zinc [member] | Segment revenues [member] | Other Segments [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 318 | 332
Zinc [member] | Inter-segment revenues [member] |  |
Disclosure of products and services [line items] |  |
Revenue | (650) | $ (635)
Energy [member] |  |
Disclosure of products and services [line items] |  |
Revenue | 407 |
Energy [member] | Segment revenues [member] | Blended bitumen [member] |  |
Disclosure of products and services [line items] |  |
Revenue | $ 407 |

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