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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2023 CAD ($)
Provision for decommissioning, restoration and rehabilitation costs [abstract]
Beginning balance	$ 3,559
Liabilities Incurred	12
Liabilities acquired	5
Liabilities Settled	(156)
Liabilities disposed	(5)
Change in Estimated Future Cash Flows	32
Unwinding of Discount on Decommissioning Liabilities (Note 4)	165
Exchange Rate Movements	(9)
Ending balance	$ 3,603

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- Definition

Increase (Decrease) In Existing Provision, Other Provisions

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- Definition

The amount of additional other provisions made. [Refer: Other provisions]

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- Definition

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 increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [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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