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Finance Costs, Net (Details) - CAD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Finance Costs [Abstract]
Interest Expense – Short-Term Borrowings and Long-Term Debt	$ 75	$ 76	$ 231	$ 229
Interest Expense – Lease Liabilities (Note 11)	43	40	126	119
Unwinding of Discount on Decommissioning Liabilities (Note 13)	63	56	179	169
Other	24	9	40	30
Capitalized Interest	(23)	(12)	(61)	(30)
Total finance costs	182	169	515	517
Interest income	(28)	(51)	(111)	(123)
Finance costs	$ 154	$ 118	$ 404	$ 394

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Capitalized Interest

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Finance Costs, Including Capitalized Interest

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- Definition

The amount of expense recognised due to the unwinding of the discount on provisions other than provisions for employee benefits, resulting from the effect of the passage of time. [Refer: Other provisions]

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The amount of costs associated with financing activities of the entity.

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The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

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The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

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The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs]

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The amount of income arising from interest.

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