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Employee benefits - Actuarial assumptions (Details)	Dec. 31, 2019	Dec. 31, 2018
Actuarial assumption of discount rates [member] | Bottom of range [member]
IFRS Statement [Line Items]
Discount rate	0.87%	1.22%
Actuarial assumption of discount rates [member] | Top of range [member]
IFRS Statement [Line Items]
Discount rate	0.88%	1.24%
Actuarial assumption of expected rates of salary increases [member]
IFRS Statement [Line Items]
Rate of increase in compensation levels	3.00%	3.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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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 2019-01-01
-Paragraph 144
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-URIDate 2019-03-27

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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

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