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Capital Commitments - Additional Information (Detail) - CAD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of capital commitments [Line Items]
Commitments to purchase property, plant and equipment	$ 137	$ 113
2022 [Member]
Disclosure of capital commitments [Line Items]
Commitments to purchase property, plant and equipment	42
2023 [Member]
Disclosure of capital commitments [Line Items]
Commitments to purchase property, plant and equipment	60
2024 [Member]
Disclosure of capital commitments [Line Items]
Commitments to purchase property, plant and equipment	$ 35

X

- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2021-03-24

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items representing capital commitments.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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X

- Details

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Balance Type:
Period Type:

X

- Details

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