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Goodwill - Schedule of Reconciliation of Changes in Goodwill (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [line items]
Beginning balance	CAD 1,114	CAD 1,127
Changes in foreign exchange rates	(27)	(13)
Ending balance	1,087	1,114
Steelmaking Coal Operations [member]
Disclosure of reconciliation of changes in goodwill [line items]
Beginning balance	702	702
Ending balance	702	702
Quebrada Blanca [member]
Disclosure of reconciliation of changes in goodwill [line items]
Beginning balance	412	425
Changes in foreign exchange rates	(27)	(13)
Ending balance	CAD 385	CAD 412

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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- Definition

The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

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