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Financial Instruments - Summary of Earnings Impact of (Gains) Losses from Risk Management Positions (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Financial Instruments [Abstract]
Realized (Gain) Loss	$ 252	$ 7	$ 1,554
Unrealized (Gain) Loss	56	149	(1,249)
(Gain) Loss on Risk Management From Continuing Operations	$ 308	$ 156	$ 305

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- Definition

Gains losses recognised in profit or loss attributable to change in unrealised gains or losses on change in fair value of derivatives.

+ References

No definition available.

+ Details

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- Definition

Settlements fair value measurement assets liabilities.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard
-URIDate 2020-01-01

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