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Basis of preparation and significant changes in the current reporting period - Reconciliation shareholders' equity under IFRS-EU and IFRS-IASB (Details) - EUR (€) € in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
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Disclosure of Reconciliation Shareholder Equity EU IFRS and IASB IFRS [Abstract] |  |  |
In accordance with IFRS-EU (attributable to the shareholders of the parent) | € 49,115 |  | € 50,147
Adjustment of the EU IAS 39 carve-out | 4,443 |  | 6,413
Tax effect of the adjustment | (1,268) |  | (1,871)
Effect of adjustment after tax | 3,175 |  | 4,542
In accordance with IFRS-IASB Shareholders’ equity | € 52,290 | € 52,703 | € 54,689

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- Definition The amount of equity attributable to the owners of the parent. This specifically excludes non-controlling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph r -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_r&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Disclosure of reconciliation shareholder equity eu ifrs and iasb ifrs [abstract] + References No definition available. + Details
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