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Retirement Benefit Plans - Summary of Weighted Average Assumptions Used to Calculate the Defined Benefit Obligation (Detail) | 12 Months Ended |
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Dec. 31, 2016 | Dec. 31, 2017
Defined Benefit Pension Plans [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Discount rate | 3.74% | 3.36%
Rate of increase in future compensation | 3.25% | 3.25%
Non-Pension Post-Retirement Benefit [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Discount rate | 3.79% | 3.44%
Rate of increase in future compensation | 3.25% | 3.25%
Initial medical trend rate | 5.50% | 5.00%
Ultimate medical trend rate | 5.00% | 5.00%
Years to reach ultimate medical trend rate | 2 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 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 Medical cost trend rate used as 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 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 medical cost trend period. + References No definition available. + Details
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- Definition Actuarial assumption of ultimate medical cost trend rates. + References No definition available. + Details
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- Details
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- Details
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