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Employee benefits - Actuarial assumptions (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Actuarial assumption of discount rates [member] |  |
IFRS Statement [Line Items] |  |
Discount rate |  | 0.42%
Actuarial assumption of discount rates [member] | Bottom of range [member] |  |
IFRS Statement [Line Items] |  |
Discount rate | 0.82% |
Actuarial assumption of discount rates [member] | Top of range [member] |  |
IFRS Statement [Line Items] |  |
Discount rate | 0.85% |
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 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 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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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 -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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