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Decommissioning Liabilities - Summary of Decommissioning Provision (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Provision For Decommissioning Restoration And Rehabilitation Costs [Abstract]
Beginning balance	$ 1,235	$ 875
Liabilities Incurred	14	3
Liabilities Settled	(42)	(52)
Liabilities Disposed	(2)	(8)
Change in Estimated Future Cash Flows	13	21
Change in Discount Rate	(28)	339
Unwinding of Discount on Decommissioning Liabilities (Note 6)	57	58
Foreign Currency Translation	1	(1)
Ending balance	$ 1,248	$ 1,235

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- Definition

Increase ​(decrease) ​in existing ​provision ​other ​provisions.

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

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- Definition

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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