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Risk management - Schedule of exposure to risk, Spain real estate business (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | € 300,026 | € 283,497 | € 243,203 |
Accumulated impairment |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | (520) | (349) | (286) |
Spain |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Excess of gross exposure over maximum recoverable amount of effective collateral | 305,156 |  |  |
Spain | Accumulated impairment |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | (1,086) |  |  |
Spain | Real estate operations in Spain | Gross carrying amount |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | 2,984 |  |  |
Spain | Real estate operations in Spain | Construction and property development |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | 2,984 | € 2,545 | € 2,433 | € 2,327
Excess of gross exposure over maximum recoverable amount of effective collateral | 211 |  |  |
Spain | Real estate operations in Spain | Construction and property development | Credit impaired |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Excess of gross exposure over maximum recoverable amount of effective collateral | 0 |  |  |
Spain | Real estate operations in Spain | Construction and property development | Gross carrying amount |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | 2,984 |  |  |
Spain | Real estate operations in Spain | Construction and property development | Gross carrying amount | Credit impaired |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | 31 |  |  |
Written-off assets | 240 |  |  |
Spain | Real estate operations in Spain | Construction and property development | Accumulated impairment | Individually calculated |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | (17) |  |  |
Spain | Real estate operations in Spain | Construction and property development | Accumulated impairment | Credit impaired | Individually calculated |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Financial assets | € (11) |  |  |

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