POST-EMPLOYMENT BENEFITS - Principal Actuarial Assumptions (Details)	Dec. 31, 2018	Dec. 31, 2017
Defined benefit obligation
Discount rate	3.90%	3.70%
Rate of compensation increase		3.00%
Pension expense
Discount rate	3.70%	4.10%
Rate of compensation increase	3.00%	3.00%
Minimum
Defined benefit obligation
Rate of compensation increase	1.00%
Maximum
Defined benefit obligation
Rate of compensation increase	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
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard
-URIDate 2018-03-16

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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 Assumption Of Discount Rates, Defined Benefit Plan Expense

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Actuarial Assumption Of Expected Rates Of Salary Increases, Defined Benefit Plan Expense

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Actuarial Assumptions Of Defined Benefit Plan Expense [Abstract]

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