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Remuneration and other benefits paid to the Bank’s directors and senior managers - Remuneration of Directors (Details) € in Millions |  | 12 Months Ended
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Mar. 22, 2024 | Dec. 31, 2025 EUR (€) branch remuneration_component annuity | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€)
Disclosure of transactions between related parties [line items] |  |  |  |
Increase (decrease) annual emoluments, per director (in percentage) |  | 3.00% |  |
Increase (decrease) attendance fees (in percentage) | 3.00% |  |  |
Immediate payment percentage |  | 40.00% |  |
Deferred payment percentage |  | 60.00% |  |
Deferral period |  | 5 years |  |
Deferred payment, number of annuities | annuity |  | 3 |  |
Maximum achievement ratio |  | 125.00% |  |
Profit/(loss) attributable to the parent |  | € 14,101.0 | € 12,574.0 | € 11,076.0
Profit/(loss) attributable to the parent, increase (decrease) in percentage |  | 12.00% |  |
Profit/(loss) attributable to the parent, increase (decrease) in constant euros |  | 16.00% |  |
Total shareholder return (in percentage) |  | 132.00% |  |
Difference between total shareholder return and peer group (in percentages) |  | 60.00% |  |
Ratio of executive directors’ total remuneration to underlying attributable profit |  | 0.17% | 0.18% |
Deferred variable compensation plan linked to multiannual objectives |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Deferred payment percentage |  | 60.00% |  |
Deferral period |  | 5 years |  |
Deferred payment, number of annuities | annuity |  | 3 |  |
Deferred payment, percentage paid in cash |  | 40.00% |  |
Deferred payment, percentage paid in shares |  | 60.00% |  |
Fair value of plan, initial achievement |  | 70.00% |  |
Deferred variable compensation, first and second portion |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Deferred payment percentage |  | 20.00% |  |
Deferred variable compensation, third, fourth and fifth portion |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Deferred payment percentage |  | 40.00% |  |
Maximum | Deferred variable compensation plan linked to multiannual objectives |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Deferral period |  | 5 years |  |
Directors |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Number of remuneration components | remuneration_component |  | 2 |  |
By-law stipulated emoluments |  | € 5.3 | € 5.4 |
Directors | Deferred variable compensation plan linked to multiannual objectives |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Immediate payment percentage |  | 40.00% |  |
Deferred payment percentage |  | 60.00% |  |
Deferral period |  | 5 years |  |
Directors | Maximum |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Remuneration of directors approved by the board of directors |  | € 6.0 | € 6.0 |
Chairman and CEO | Ana Botina and Jose Antonio Alvarez |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Pensionable base, expressed as a percent of fixed, percentage |  | 22.00% |  |
Pensionable base, expressed as a percent of fixed, bonus average |  | 30.00% |  |
Pensionable base, expressed as a percent of fixed, number of previous bonuses | branch |  | 3 |  |

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