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v3.26.1

Subordinated liabilities - Schedule of subordinated liabilities detail, by currency of issue (Details) - Financial liabilities at amortised cost € in Millions, £ in Millions, R$ in Millions, $ in Millions | 12 Months Ended |  |  |  |
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Dec. 31, 2025 EUR (€) | Dec. 31, 2025 USD ($) | Dec. 31, 2025 BRL (R$) | Dec. 31, 2025 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |
Outstanding issue amount | € 29,287 |  |  |  | € 35,813 | € 30,912 | € 25,926
Euro |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |
Outstanding issue amount | € 11,402 |  |  |  | 14,999 | 13,684 |
Annual interest rate | 4.55% |  |  |  |  |  |
US dollar |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |
Outstanding issue amount | € 9,750 | $ 11,462 |  |  | 13,425 | 11,300 |
Annual interest rate | 6.53% |  |  |  |  |  |
Brazilian real |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |
Outstanding issue amount | € 4,354 |  | R$ 28,117 |  | 3,600 | 2,518 |
Annual interest rate | 16.30% |  |  |  |  |  |
Pound sterling |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |
Outstanding issue amount | € 1,347 |  |  | £ 1,176 | 1,409 | 1,353 |
Annual interest rate | 4.28% |  |  |  |  |  |
Other currencies |  |  |  |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |  |  |  |
Outstanding issue amount | € 2,434 |  |  |  | € 2,380 | € 2,057 |

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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 -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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