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Net interest income - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net Interest Income Disclosure [Line Items] |  |  |
Interest income (expense) | € (15,288) | € (16,162) | € (14,593)
ECB funding rate benefit on TLTRO III programme |  |  | 314
Interest paid, TLTRO III | 15,105 | 11,940 | 3,506
EU IAS 39 carve-out |  |  |
Net Interest Income Disclosure [Line Items] |  |  |
Increase (decrease) of net interest income | 265 | 187 | 836
Without EU IAS 39 carve-out |  |  |
Net Interest Income Disclosure [Line Items] |  |  |
Increase (decrease) of net interest income | (609) |  |
TLTRO III |  |  |
Net Interest Income Disclosure [Line Items] |  |  |
Interest paid, TLTRO III | € 59 | € 557 |
Poland |  |  |
Net Interest Income Disclosure [Line Items] |  |  |
Interest income (expense) |  |  | € (343)

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- Definition The amount of income or expense arising from interest. [Refer: Interest expense; Interest income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
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