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Employee Defined Benefit Obligations - Summary of Principal Assumptions Used In Determining Pension Benefit Obligations (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |
Discount rate | 2.77% | 2.47%
Rate of increase in salaries | 4.47% | 3.51%
Rate of inflation, pre-retirement | 2.55% | 2.40%
Rate of increase in future pensions payment | 3.51% | 3.53%
Life expectancy at age 65 for current pensioners: |  |
Male | 22 years | 22 years
Female | 24 years | 24 years
Life expectancy at age 65 for current members aged 40 or 45: |  |
Male | 23 years | 23 years
Female | 25 years | 26 years

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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 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 + Details
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- Definition The expected rate of increases in pension that is 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 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 + 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 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 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Actuarial assumption of expected rates of inflation pre retirement. + References No definition available. + Details
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- Definition Life expectancy at age sixty five for current members aged forty. + References No definition available. + Details
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- Definition Life expectancy at age sixty five for current members aged forty female. + References No definition available. + Details
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- Definition Life expectancy at age sixty five for current members aged forty male. + References No definition available. + Details
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- Definition Life expectancy at age sixty five for current pensioners male. + References No definition available. + Details
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