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Goodwill - Allocation (Details) - CAD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	$ 3,473	$ 2,272	$ 2,272
Primrose (Foster Creek)
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	1,171	1,171
Christina Lake
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	1,101	1,101
Lloydminister thermal
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	651	0
Sunrise
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	$ 550	$ 0

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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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