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Debt and Capital Structure - Summary of Net Debt to Adjusted Funds Flow (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Borrowings [abstract]
Net Debt	$ 4,282	$ 9,591	$ 7,184
Cash flows from (used in) operating activities	11,403	5,919	273
Settlement of Decommissioning Liabilities	(150)	(102)	(42)
Net Change In Non-Cash Working Capital	575	(1,227)	198
Adjusted Funds Flow	$ 10,978	$ 7,248	$ 117
Net Debt To Adjusted Funds Flow	40.00%	130.00%	6140.00%

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Adjusted Funds Flow

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Increase (Decrease) in Working Capital, Operating Activities

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Net Debt To Adjusted Funds Flow

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Payments For Decommissioning, Restoration And Rehabilitation Costs

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The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue]

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The amount of net debt of the entity.

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