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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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The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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