POST-EMPLOYMENT BENEFITS - Principal Actuarial Assumptions (Details)	Dec. 31, 2021	Dec. 31, 2020
Defined benefit obligation
Discount rate	3.30%	2.70%
Pension expense
Discount rate	2.70%	3.20%
Minimum
Defined benefit obligation
Rate of compensation increase	1.00%	1.00%
Pension expense
Rate of compensation increase	1.00%	1.00%
Maximum
Defined benefit obligation
Rate of compensation increase	4.50%	4.50%
Pension expense
Rate of compensation increase	4.50%	4.50%

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
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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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Actuarial Assumption Of Defined Benefit Obligations [Abstract]

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Actuarial Assumptions Of Defined Benefit Plan Expense [Abstract]

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