Acquisitions and Dispositions - Assets and liabilities disposed (Detail: Text Values) € in Millions	12 Months Ended
Dec. 31, 2025 disposition	Dec. 31, 2024 EUR (€) disposition	Dec. 31, 2023 EUR (€)
Acquisitions and Dispositions [Abstract]
Number of dispositions \| disposition	0	0
Total cash consideration received for dispositions of subsidiaries/businesses		€ 3	€ 117
of which: in cash		€ 3	€ 99

The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Total for all subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
-Paragraph 40
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_40_a&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_ConsiderationPaidReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration