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Personnel costs - Additional Information (Details) - employee	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Employee Benefits [Abstract]
Number of employees	91,573	95,442	99,412

X

- Definition

The number of personnel employed by the entity at a date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2021-03-24

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X

- Definition

Employee Benefits [Abstract]

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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