Financial Risks - Additional Information (Detail) - EUR (€) € in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Disclosure of financial risk management [line items]
Amount of undiscounted expected credit losses at initial recognition	€ 1	€ 1

The amount of undiscounted expected credit losses at initial recognition on financial assets initially recognised during the reporting period as purchased or originated credit-impaired.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 66
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66_c&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 35H
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35H_c&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 66
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66_c&doctype=Standard
-URIDate 2025-03-27

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