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Provisions - Schedule of other provisions by geographical area (Details) € in Millions, £ in Millions | Dec. 31, 2025 EUR (€) | Dec. 31, 2025 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
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Disclosure of other provisions [line items] |  |  |  |  |  |
Provisions | € 8,355.0 |  | € 8,407.0 |  | € 8,441.0 | € 8,149.0
Other provisions |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Provisions | 4,993.0 |  | 5,051.0 |  | 4,634.0 | € 4,073.0
Spain | Other provisions |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Provisions | 2,033.0 |  | 1,924.0 |  | 1,921.0 |
Rest of Europe | Other provisions |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Provisions | 310.0 |  | 694.0 |  | 433.0 |
Other Foreign Countries Not Including Countries in EU | Other provisions |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Provisions | 2,650.0 |  | 2,433.0 |  | 2,280.0 |
Brazil | Other provisions |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Provisions | 1,530.0 |  | 1,445.0 |  | 1,618.0 |
United Kingdom | Other provisions |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Provisions | 736.0 |  | 654.0 |  | € 373.0 |
United Kingdom | Other provisions | Financial Conduct Authority (FCA) Review of The Vehicle Finance Market |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Provisions | € 528.1 | £ 461.0 | € 353.3 | £ 293.0 |  |

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