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Financial Instruments - Net Loss (Gain) from Risk Management Activities (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments [Abstract]
Net realized risk management (gain) loss	$ 168	$ (14)	$ (7)
Net unrealized risk management loss (gain)	9	12	(28)
Gains (loss) on change in fair value of derivatives	$ 177	$ (2)	$ (35)

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- Definition

Financial Instruments [Abstract]

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No definition available.

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- Definition

Gain (Loss) On Change In Fair Value Of Settled Derivatives

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No definition available.

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- Definition

Gain (Loss) On Change In Fair Value Of Unsettled Derivatives

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No definition available.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 85
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-URIDate 2024-03-27

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