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Employee benefits - Actuarial assumptions (Details)	Dec. 31, 2022	Dec. 31, 2021
Actuarial assumption of discount rates | Bottom of range
Statement [line items]
Discount rate	1.40%	0.82%
Actuarial assumption of discount rates | Top of range
Statement [line items]
Discount rate	1.41%	0.85%
Actuarial assumption of expected rates of salary increases
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

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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
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-IssueDate 2022-03-24
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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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