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Provisions - Disclosure of Assumptions Used to Measure Retirement Benefits (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of defined benefit plans [table]
Social security contribution rate	42.01%	44.00%
Discount rate	0.98%	0.33%
Staff turnover	0.0586%	0.0586%
Duration	20 years	17 years
Management
Disclosure of defined benefit plans [table]
Retirement assumptions	66 years	66 years
Non-management
Disclosure of defined benefit plans [table]
Retirement assumptions	64 years	64 years
Executive
Disclosure of defined benefit plans [table]
Salary increase rate (including inflation)	3.00%	3.00%
Non-executive
Disclosure of defined benefit plans [table]
Salary increase rate (including inflation)	0.025%	0.025%

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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-IssueDate 2021-01-01
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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
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-Paragraph 144
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- Definition

The retirement age used as a 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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-IssueDate 2021-01-01
-Paragraph 144
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- Definition

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

+ References

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 147
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- Definition

Actuarial Assumption Of Expected Average Rates Of Staff Turnover

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- Definition

Actuarial Assumption Of Social Security Contribution Rates

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