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Net Defined Benefit Liabilities - Summary of Principal Actuarial Assumptions (Detail)	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Bottom of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	1.66%	2.20%	1.85%
Future salary increase	1.00%	1.39%	1.00%
Top of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	3.00%	3.34%	3.66%
Future salary increase	6.81%	7.82%	8.03%

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
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-Number 19
-IssueDate 2019-01-01
-Paragraph 144
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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 2019-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard
-URIDate 2019-03-27

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X

- 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.

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