Employee compensation and benefits - Key actuarial assumptions for the principal plan (Details)	Dec. 31, 2022	Dec. 31, 2021
Disclosure of defined benefit plans [line items]
Inflation rate (CPI)	2.84%	3.20%
Pension Plan \| Principal plan
Disclosure of defined benefit plans [line items]
Discount rate	4.93%	1.90%
Inflation rate (RPI)	3.39%	3.45%
Rate of increase for pensions	3.27%	3.30%
Rate of pay increase	3.34%	3.45%

Actuarial Assumption Of Expected Rates Of Inflation, Consumer Price Index

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- Definition

Actuarial Assumption Of Expected Rates Of Inflation, Retail Price Index

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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 2022-03-24
-Paragraph 144
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-URIDate 2022-03-24

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- Definition

The expected rate of increases in pension that is 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]]

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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]]

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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.

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No definition available.

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