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Employee Future Benefits - Additional Information (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of defined benefit plans [Line Items]
Assets set aside for plan	$ 0
Canadian plans [Member]
Disclosure of defined benefit plans [Line Items]
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024	$ 2
Return-seeking assets [Member]
Disclosure of defined benefit plans [Line Items]
Target asset allocation for plan	30.00%	30.00%
Return-seeking assets [Member] | Canada [member]
Disclosure of defined benefit plans [Line Items]
Target asset allocation for plan	17.00%	20.00%
Liability-hedging assets [Member]
Disclosure of defined benefit plans [Line Items]
Target asset allocation for plan	70.00%	70.00%
Liability-hedging assets [Member] | Canada [member]
Disclosure of defined benefit plans [Line Items]
Target asset allocation for plan	83.00%	80.00%
Pension defined benefit plans [member]
Disclosure of defined benefit plans [Line Items]
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024	$ 61
Defined contribution pension plans [Member]
Disclosure of defined benefit plans [Line Items]
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024	96
Retiree welfare plans [Member]
Disclosure of defined benefit plans [Line Items]
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024	$ 13

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 147
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_147_b&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 148
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_148_d_iii&doctype=Standard
-URIDate 2023-03-23

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X

- Definition

The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

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- Definition

Defined benefit plan target asset allocation percentage.

+ References

No definition available.

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