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Financial Instruments - Estimated Fair Values of Derivative Financial Instruments Included in Risk Management Asset (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation Of Changes In Derivative Financial Assets (Liabilities), Net [Roll Forward]
Derivative financial asset (liability), net	$ 55	$ (24)
Net change in fair value of outstanding derivatives financial instruments recognized in: Risk management activities	70	(12)
Net change in fair value of outstanding derivatives financial instruments recognized in: Foreign exchange	(119)	82
Net change in fair value of outstanding derivatives financial instruments recognized in: Other comprehensive income	0	9
Derivative financial asset, net	6	55
Asset (liability), included in current portion of other long-term (liabilities) assets	0	(67)
Asset, included in other long-term assets	$ 6	$ 122

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- Definition

Current Derivative Financial Assets (Liabilities)

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- Definition

Derivative Financial Assets (Liabilities), Net

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- Definition

Gain (Losses) On Change In Fair Value Of Unsettled Derivatives, Including Fair Value Movement Of Commodity Financial Instruments

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- Definition

Gains (Losses) On Exchange Differences On Translation Recognised In Profit Or Loss, Settled And Unsettled Derivative Hedging Instruments

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- Definition

Non-Current Derivative Financial Assets (Liabilities)

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- Definition

Reconciliation Of Changes In Derivative Financial Assets (Liabilities), Net [Roll Forward]

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- Definition

The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax, before reclassification adjustments. [Refer: Cash flow hedges [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 91
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_b&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 23
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_23_c&doctype=Standard&book=b
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