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Employee Benefits (Actuarial Assumptions) (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Discount rate as at the end of the year [Member]
Actuarial assumptions [Line Items]
Principal actuarial assumptions	2.60%	2.90%	3.30%
Future salary increases [Member]
Actuarial assumptions [Line Items]
Principal actuarial assumptions	2.90%	2.60%	2.90%
Future pension increase [Member]
Actuarial assumptions [Line Items]
Principal actuarial assumptions	2.20%	2.20%	2.20%

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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.

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- Definition

The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 145
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