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Retirement Benefit Plans - Summary of Weighted Average Assumptions Used to Calculate the Defined Benefit Obligation (Detail)	12 Months Ended
	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

X

- 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
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-URIDate 2017-03-09

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X

- 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

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X

- 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

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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

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- Definition

Actuarial assumption of medical cost trend period.

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- Definition

Actuarial assumption of ultimate medical cost trend rates.

+ References

No definition available.

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