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Goodwill - Allocation (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	$ 2,923	$ 2,923
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
Lloydminster Thermal
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	$ 651	$ 651

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- Definition

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

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- Definition

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: Total for all business combinations [member]]

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