Pensions and Other Post-Employment Benefits - Sensitivity of Defined Benefit and OPEB Obligation to Changes in Relevant Actuarial Assumptions (Detail) - CAD ($)	Dec. 31, 2023	Dec. 31, 2022
Future Salary Growth Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase	$ 0
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Percentage of reasonably possible increase in actuarial assumption	1.00%
Health Care Cost Trend Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase	$ 0
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Percentage of reasonably possible increase in actuarial assumption	1.00%
One Year Change in Assumed Life Expectancy
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase	$ 0
Reasonably Possible Decrease In Actuarial Assumption, Life Expectancy	1 year
Reasonably Possible Increase In Actuarial Assumption, Life Expectancy	1 year
Discount Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase	$ (54,000,000)	$ (43,000,000)
Decrease	$ 66,000,000	$ 51,000,000
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Percentage of reasonably possible increase in actuarial assumption	1.00%

Reasonably Possible Decrease In Actuarial Assumption, Life Expectancy

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- Definition

Reasonably Possible Increase In Actuarial Assumption, Life Expectancy

+ References

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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.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 145
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard
-URIDate 2023-03-23

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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- Definition

The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

+ References

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The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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