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Investments accounted for using the equity method - Additional Information (Details) - EUR (€) € in Millions | 2 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Disclosure of transactions between related parties [line items] |  |  |
Share of profit/(loss) from investments accounted for using the equity method |  | € 2 | € 85
OPAL JV Co |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Share of profit/(loss) from investments accounted for using the equity method | € 11 | € (39) |

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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. + References No definition available. + Details
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
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- Details
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