Subsequent events - Text Details (Detail)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2022
Subsequent events [Line Items]
Number of employees reduced	3,000	6,000	4,000
Announcing or commencing implementation of major restructuring [member]
Subsequent events [Line Items]
Description of nature of non-adjusting event after reporting period	EUR 470 million

The description of the nature of a non-adjusting event after the reporting period. [Refer: Non-adjusting events after reporting period [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 10
-IssueDate 2021-01-01
-Paragraph 21
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=10&code=ifrs-tx-2021-en-r&anchor=para_21_a&doctype=Standard
-URIDate 2021-03-24

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Period Type:	duration