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Debt and Capital Structure - Schedule of Short-Term Borrowings (Detail) - CAD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]
Short-Term Borrowings	$ 14	$ 115
Uncommitted Demand Facility
Disclosure of detailed information about borrowings [line items]
Short-Term Borrowings	0	0
WRB Refining LP
Disclosure of detailed information about borrowings [line items]
Short-Term Borrowings	$ 14	$ 115

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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.

+ References

No definition available.

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- Definition

The amount of current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
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-URIDate 2023-03-23

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