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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - CAD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disclosure of detailed information about financial instruments [line items]
(Gain) Loss on Risk Management	$ (2)	$ (20)	$ (79)	$ 42
Realized (Gain) Loss
Disclosure of detailed information about financial instruments [line items]
(Gain) Loss on Risk Management	17	(27)	(14)	11
Unrealized (Gain) Loss
Disclosure of detailed information about financial instruments [line items]
(Gain) Loss on Risk Management	$ (19)	$ 7	$ (65)	$ 31

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- Definition

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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2024-01-01
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