Retirement Benefit Plans - Summary of Weighted Average Assumptions Used to Calculate the Defined Benefit Obligation (Detail)	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Pension Plans
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate	4.63%	5.05%
Rate of increase in future compensation	3.25%	3.25%
Non-Pension Post- Retirement Benefit Plans
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate	4.64%	5.06%
Rate of increase in future compensation	3.25%	3.25%
Medical trend rate	5.00%	5.00%

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 144
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard
-URIDate 2023-03-23

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- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

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- Definition

Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

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