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POST-EMPLOYMENT BENEFITS - Principal Actuarial Assumptions (Details) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Defined benefit obligation |  |
Discount rate | 3.70% | 4.10%
Rate of compensation increase | 3.00% | 3.00%
Pension expense |  |
Discount rate | 4.10% | 4.30%
Rate of compensation increase | 3.00% | 3.00%

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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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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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 -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Actuarial Assumption Of Defined Benefit Obligations [Abstract] + References No definition available. + Details
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- Definition Actuarial Assumption Of Expected Rates Of Salary Increases, Defined Benefit Plan Expense + References No definition available. + Details
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