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Grupo Santander - Tender offer for shares of Banco Santander México, S.A., Institución de Banca Múltiple, Grupo Financiero Santander México (Details) - Banco Santander México, S.A., Institución de Banca Múltiple, Grupo Financiero Santander México € / shares in Units, € in Millions |  |  | 2 Months Ended | 8 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2023 EUR (€) | Apr. 09, 2023 | Apr. 10, 2023 EUR (€) | Dec. 31, 2023 | Apr. 10, 2023 $ / shares | Apr. 10, 2023 $ / shares | Apr. 10, 2023 € / shares | Nov. 30, 2022 | Oct. 21, 2022
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 3.60% | 3.60% | 3.60% |  | 3.76%
Ownership interest in subsidiary | 99.80% | 96.20% |  |  |  |  |  |  |
Consideration (in MXN/EUR per share) | (per share) |  |  |  |  |  | $ 24.52 | € 1.20 |  |
Consideration, in cash per American Depositary Share | $ / shares |  |  |  |  | $ 6.6876 |  |  |  |
Expected consideration per American Depositary Share (in MXN per share) | $ / shares |  |  |  |  |  | $ 122.6 |  |  |
Consideration paid (received) |  |  | € 300 |  |  |  |  |  |
Increase through business combinations, reserves | € 13 |  |  |  |  |  |  |  |
Increase (decrease) through business combinations, minority interest | € (313) |  |  |  |  |  |  |  |
Business combination, minimum acceptance percentage by Shareholders of acquiree |  |  |  |  |  |  |  | 95.00% |
Repurchase trust, group's effective participation (in percentage) |  |  |  | 99.98% |  |  |  |  |

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