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Risk management - Disclosure of concentrations by risk factor, structural risk (Details) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Structural VaR |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR percentage | 99.00% |  |
Time horizon | 1 day |  |
Diversification effect |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | € (17.7) | € (27.3) | € (17.1)
Diversification effect | Min |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | (10.7) |  |
Diversification effect | Average |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | (21.0) | (19.8) | (14.9)
Diversification effect | Max |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | (59.3) |  |
Exchange rate |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 6.3 | 5.9 | 4.8
Exchange rate | Min |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 3.3 |  |
Exchange rate | Average |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 7.4 | 5.8 | 5.3
Exchange rate | Max |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 37.5 |  |
VaR Equities |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 8.1 | 9.5 | 6.0
VaR Equities | Min |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 2.4 |  |
VaR Equities | Average |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 6.5 | 6.0 | 3.2
VaR Equities | Max |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 10.8 |  |
Banking book | Structural VaR |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 690.1 | 687.5 | 749.5
Banking book | Structural VaR | Min |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 598.5 |  |
Banking book | Structural VaR | Average |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 662.9 | 747.7 | 705.0
Banking book | Structural VaR | Max |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 751.9 |  |
Banking book | Diversification effect |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | (206.6) | (268.6) | (444.7)
Banking book | Diversification effect | Min |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | (155.9) |  |
Banking book | Diversification effect | Average |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | (258.4) | (386.4) | (416.6)
Banking book | Diversification effect | Max |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | (265.6) |  |
Banking book | VaR Interest Rate |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 177.6 | 235.2 | 380.2
Banking book | VaR Interest Rate | Min |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 158.3 |  |
Banking book | VaR Interest Rate | Average |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 177.3 | 412.0 | 348.4
Banking book | VaR Interest Rate | Max |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 205.8 |  |
Banking book | Exchange rate |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 572.4 | 594.4 | 642.9
Banking book | Exchange rate | Min |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 486.0 |  |
Banking book | Exchange rate | Average |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 597.7 | 571.7 | 580.4
Banking book | Exchange rate | Max |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 648.7 |  |
Banking book | VaR Equities |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 146.7 | 126.5 | 171.1
Banking book | VaR Equities | Min |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 110.1 |  |
Banking book | VaR Equities | Average |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | 146.3 | € 150.4 | € 192.8
Banking book | VaR Equities | Max |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
VaR | € 163.0 |  |

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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 measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 41 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_41&doctype=Standard -URIDate 2025-03-27 + Details
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