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Commitments and Contingencies - Narrative (Details) - CAD ($) $ in Millions | Sep. 30, 2023 | Feb. 28, 2023 | Dec. 31, 2022
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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 The amount of future capital expenditures that the entity is committed to make. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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