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Derivatives and hedge accounting - Gross carrying value of derivatives used for cash flow hedge accounting (Details) - - Derivatives - Cash flow hedges - Net payer and receiver swap - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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– Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument, assets | € 10,635 | € 11,839
Hedging instrument, liabilities | 12,814 | 14,051
– Cross currency swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument, assets | 472 | 324
Hedging instrument, liabilities | 339 | 39
– Cross currency interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument, assets |  | 57
Hedging instrument, liabilities | € 10 |

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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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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
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