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Provisions - Schedule of other provisions by type of provision (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of other provisions [line items] |  |  |  |
Provisions | € 8,355 | € 8,407 | € 8,441 | € 8,149
Other provisions |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 4,993 | 5,051 | 4,634 | € 4,073
Provisions for taxes |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 720 | 727 | 745 |
Legal proceedings provision |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 1,675 | 1,532 | 1,359 |
Provision for customer remediation |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 826 | 1,001 | 454 |
Provision for restructuring |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 279 | 589 | 596 |
Other |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 899 | 744 | 869 |
Brazil | Other provisions |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 1,530 | 1,445 | 1,618 |
Brazil | Provisions for employment-related proceedings (Brazil) |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | € 594 | € 458 | € 611 |

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- Definition The amount of liabilities of uncertain timing or amount, including provisions for employee benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph l -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_l&doctype=Standard -URIDate 2025-03-27 + Details
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