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Pensions and Other Post-Employment Benefits - Summary of Principal Weighted Average Actuarial Assumptions Used to Determine Benefit Obligations and Expenses (Detail) - yr | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Pension Benefits |  |  |
Disclosure Of Actuarial Assumptions [Line Items] |  |  |
Discount Rate | 5.12% | 2.95% | 2.50%
Future Salary Growth Rate | 4.05% | 4.03% | 3.97%
Average Longevity (years) | 88.4 | 88.3 | 88.3
OPEB |  |  |
Disclosure Of Actuarial Assumptions [Line Items] |  |  |
Discount Rate | 5.13% | 2.98% | 2.50%
Future Salary Growth Rate |  | 4.94% | 4.94%
Average Longevity (years) | 88.4 | 88.3 | 88.2
Health Care Cost Trend Rate | 5.24% | 5.64% | 6.00%

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- Definition 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]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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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]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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