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Commitments and Contingencies - Narrative (Details) - CAD ($) $ in Millions	Sep. 30, 2023	Feb. 28, 2023	Dec. 31, 2022
Disclosure Of Commitments And Contingent Liabilities [Line Items]
Total commitments	$ 24,690
Outstanding letters of credit	353		$ 490
HMLP
Disclosure Of Commitments And Contingent Liabilities [Line Items]
Total commitments	$ 2,100		$ 2,200
BP-Husky Refining LLC
Disclosure Of Commitments And Contingent Liabilities [Line Items]
Total commitments		$ 538

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- Definition

Disclosure Of Commitments And Contingent Liabilities [Line Items]

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Letters of credit issued as security for performance.

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The amount of future capital expenditures that the entity is committed to make.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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