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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Provision for decommissioning, restoration and rehabilitation costs [abstract]
Beginning balance	$ 4,155	$ 3,559
Liabilities Incurred	24	14
Liabilities acquired	0	5
Liabilities Settled	(234)	(221)
Liabilities disposed	(72)	(5)
Change in Estimated Future Cash Flows	276	330
Change in Discount Rates	132	265
Unwinding of Discount on Decommissioning Liabilities (Note 7)	225	220
Exchange Rate Movements and Other	28	(12)
Ending balance	$ 4,534	$ 4,155

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Acquisitions through business combinations, decommissioning liabilities

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- Definition

Increase (Decrease) In Existing Provision, Other Provisions

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- Definition

The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions]

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The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

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The amount recognised for new other provisions. [Refer: Other provisions]

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The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions]

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The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions]

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