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Letters of credit issued as security for performance.

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The debt to capitalization ratio the company cannot exceed under the committed credit facility agreement.

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Target net debt to adjusted earnings before interest taxes depreciation depletion and amortization ratio.

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Amount of undrawn borrowing facilities that may be available for general purposes.

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Undrawn Borrowing Facilities, Outstanding

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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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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Total for all joint ventures [member]]

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The amount of current borrowings. [Refer: Borrowings]

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DEBT AND CAPITAL STRUCTURE - Additional Information (Details) $ in Millions		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2026 CAD ($) $ / bbl	Dec. 31, 2025 CAD ($)
Disclosure of detailed information about borrowings [line items]
Outstanding letters of credit		$ 368	$ 341
Maximum debt to capitalization ratio		65.00%
Target net debt to adjusted EBITDA ratio		1.0
Target net debt		$ 4,000
Average crude oil price \| $ / bbl		45.00
WRB Refining LP
Disclosure of detailed information about borrowings [line items]
Share of equity investment	50.00%
Uncommitted Demand Facility
Disclosure of detailed information about borrowings [line items]
Current borrowings		$ 0	0
Committed Credit Facilities, Maturing November 10, 2025
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity		3,300
Committed Credit Facilities, Maturing November 10, 2026
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity		2,200
Committed credit facilities
Disclosure of detailed information about borrowings [line items]
Undrawn borrowing facilities, outstanding		0	0
Term Loan Facility
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity		2,700
Maximum
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity		1,500	$ 1,500
Maximum \| Maximum
Disclosure of detailed information about borrowings [line items]
Amount of undrawn facilities for general purposes		$ 1,400