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Fair value of assets and liabilities - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Financial assets classified as Level 3 based on quoted price | € 9,600 | € 7,000 |
Percentage on financial asset based on unadjusted quoted price | 87.20% | 76.70% |
Amount of risk neutral designed financial assets | € 100 | € 300 |
Remaining financial assets classified as level 3 using valuation techniques | 1,300 | 1,800 |
Financial liabilities measured at fair value | 86,900 | 94,638 |
Financial Liabilities classified as Level 3 based on unadjusted quoted price | 600 | 400 |
Financial Liabilities designed to be fully neutral in terms of market risk | 100 | 300 |
- Debt securities |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Transfer from Level 2 to Level 1 | 800 |  |
Level 3 |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Fair value of swap | € 11,005 | € 9,118 | € 7,526
Percentage on financial asset based on unadjusted quoted price | 75.70% | 50.00% |
Financial liabilities measured at fair value | € 770 | € 729 |
Remaining financial liabilities classified as level 3 using valuation techniques | € 100 | € 100 |

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of transfers out of Level 2 and into Level 1 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Amount of financial liabilities designed to be fully neutral. + References No definition available. + Details
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- Definition Disclosure of fair value measurement of assets and liabilities. + References No definition available. + Details
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- Definition Financial assets classified as Level 3 based on quoted price. + References No definition available. + Details
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- Definition Financial Liabilities classified as Level 3 based on unadjusted quoted price. + References No definition available. + Details
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