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Pension and Other Employee Benefits - Summary of Weighted Average Assumptions Used to Determine Pension Benefits of Defined Benefit Pension Plans (Detail)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Defined Benefit Plans [Line Items]
Rate of increase in compensation	5.70%	6.00%	6.00%
Discount rate	5.30%	3.50%	4.80%
Investment Property [Member] | Smart and Subsidiaries [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Rate of increase in compensation	5.00%	5.00%	5.00%
Discount rate	5.00%	3.50%	7.30%

X

- 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
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X

- 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

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.

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