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Debt and Capital Structure - Schedule of Net Debt to Adjusted Funds Flow (Details) - CAD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Dec. 31, 2024
Borrowings [abstract]
Net Debt	$ 5,255		$ 5,255		$ 5,255	$ 4,614
Cash From (Used in) Operating Activities	2,131	$ 2,474	5,820	$ 7,206	7,849	9,235
Settlement of Decommissioning Liabilities	(94)	(74)	(198)	(170)	(262)	(234)
Net Change in Non-Cash Working Capital	$ (241)	$ 588	$ (179)	$ 813	313	1,305
Adjusted funds flow					$ 7,798	$ 8,164
Net Debt to Adjusted Funds Flow (times)					70.00%	60.00%

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Adjusted Funds Flow

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Increase (Decrease) in Working Capital, Operating Activities

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Net Debt To Adjusted Funds Flow

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Payments For Decommissioning, Restoration And Rehabilitation Costs

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The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities, from continuing and discontinued operations. [Refer: Revenue]

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The amount of net debt of the entity.

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