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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2022 CAD ($)
Provision for decommissioning, restoration and rehabilitation costs [abstract]
Beginning balance	$ 3,906
Liabilities Incurred	6
Liabilities Settled	(75)
Liabilities Disposed	(84)
Change in Estimated Future Cash Flows	2
Change in Discount Rate	(1,050)
Unwinding of Discount on Decommissioning Liabilities (Note 5)	89
Foreign Currency Translation	(6)
Ending balance	$ 2,788

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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 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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