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Employees - Summary of Assumptions, Weighted by Liabilities for Valuation of Defined Benefit Plans Which cover Approximately 96% of Total Pension Plan (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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Defined benefit pension plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 2.50% | 2.60%
Inflation | 2.50% | 2.50%
Rate of increase in salaries | 2.80% | 2.90%
Rate of increase for pensions in payment (where provided) | 2.40% | 2.40%
Rate of increase for pensions in deferment (where provided) | 2.60% | 2.70%
Other post-employment benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 4.20% | 4.80%
Rate of increase in salaries | 3.00% | 3.00%
Long-term medical cost inflation | 5.30% | 5.30%

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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 2016-01-13 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The expected rate of inflation 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 2016-01-13 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&doctype=Standard -URIDate 2016-03-31 + 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 increase for pensions in deferment where provided. + References No definition available. + Details
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- Definition Actuarial assumption of increase for pensions in payment where provided. + References No definition available. + Details
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- Definition Actuarial assumption of long term medical cost inflation. + References No definition available. + Details
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- Details
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- Details
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