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Financial Instruments - Estimated Fair Values of Derivative Financial Instruments Included in Risk Management Asset (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation Of Changes In Derivative Financial Assets (Liabilities), Net [Roll Forward]
Derivative financial asset (liability), net, beginning balance	$ 9	$ 6
Risk management activities	(6)	3
Foreign exchange	1	0
Other comprehensive income	1	0
Derivative financial asset (liability), net, ending balance	5	9
Less: current portion	5	8
Asset, included in other long-term assets	$ 0	$ 1

X

- Definition

Current Derivative Financial Assets (Liabilities)

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- Definition

Derivative Financial Assets (Liabilities), Net

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- Definition

Gain (Losses) On Change In Fair Value Of Unsettled Derivatives, Including Fair Value Movement Of Commodity Financial Instruments

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- Definition

Gains (Losses) On Exchange Differences On Translation Recognised In Profit Or Loss, Settled And Unsettled Derivative Hedging Instruments

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- Definition

Non-Current Derivative Financial Assets (Liabilities)

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- Definition

Reconciliation Of Changes In Derivative Financial Assets (Liabilities), Net [Roll Forward]

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- Definition

The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax, before reclassification adjustments. [Refer: Cash flow hedges [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 91
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_b&doctype=Standard
-URIDate 2024-03-27

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