Critical Accounting Estimates and Judgments - Additional Information (Detail) CAD in Millions	12 Months Ended
Dec. 31, 2017 CAD
Disclosure of critical accounting estimates and judgments [line items]
Increase in decommissioning and restoration provision for Teck Coal water quality management	CAD 244
Decommissioning and restoration provisions for Teck Coal water quality management	CAD 394
Nominal discount rate	6.82%
Inflation rate	2.00%
Top of range [member]
Disclosure of critical accounting estimates and judgments [line items]
Decommissioning and restoration provisions period	100 years

Decommissioning and restoration provision period coal water management.

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Decommissioning and restoration provisions coal water management.

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Disclosure of critical accounting estimates and judgments [line items]

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Increase in decommissioning and restoration provisions coal water management.

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Inflation rate decommissioning and restoration provision.

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Nominal discount rate decommissioning and restoration provision coal water management.

No definition available.

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