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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
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%

X

- Definition

Disclosure of actuarial assumptions.

+ References

No definition available.

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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
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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]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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
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-IssueDate 2022-03-24
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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

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