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Subordinated loans - Additional information (Details) € in Millions, $ in Millions | 1 Months Ended | 6 Months Ended |  |
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Apr. 30, 2025 USD ($) | Mar. 31, 2025 EUR (€) | Jun. 30, 2025 EUR (€) | Jun. 30, 2024 EUR (€) | May 31, 2025 EUR (€) | Dec. 31, 2024 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Subordinated loans |  |  |  | € 16,566 |  |  | € 17,878
Redemption of subordinated loans | [1] |  |  | € 65,413 | € 50,636 |  |
4.13% Fixed Rate Subordinated Green Tier 2 Notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Subordinated loans |  |  |  |  |  | € 1,250 |
Borrowings, interest rate |  |  |  |  |  | 4.13% |
2% Fixed Rate Subordinated Tier 2 Notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 2.00% |  |  |  |
Redemption of subordinated loans |  |  | € 750 |  |  |  |
6.5% Perpetual Additional Tier 1 Contingent Convertible Capital Securities |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings, interest rate |  | 6.50% |  |  |  |  |
Redemption of subordinated loans | $ |  | $ 1,250 |  |  |  |  |
[1] | Cash flows are reported on a gross basis and include investments and borrowings of short term securities

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- Definition The cash outflow for repayments of bonds, notes and debentures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of liabilities that are subordinate to other liabilities with respect to claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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