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]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Subsequent Events (Details) - CAD ($) $ in Millions		12 Months Ended
Subsequent Events (Details) - CAD ($) $ in Millions	Aug. 08, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Combinations [Abstract]
Goodwill		$ 2,923	$ 3,473	$ 2,272
BP-Husky Refining LLC
Business Combinations [Abstract]
Agreement to purchase remaining ownership	50.00%	50.00%