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Shareholders’ equity (Details Narrative) - BRL (R$) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Apr. 26, 2024
Shareholders Equity |  |  |
Share issued | 9,090,909,090 |  |
Share capital amount |  |  | R$ 10,000,000,000
Increase in share capital amount |  |  | R$ 65,000,000,000
Description of buyback program | The Buyback Program covers the acquisition of up to 36,205,005 Units, representing 36,205,005 common shares and 36,205,005 preferred shares, which corresponded, on December 31, 2025, to approximately 1% of the Bank's share capital. On December 31, 2025, Banco Santander had 356,245,448 common shares and 384,049,858 preferred shares outstanding. |  |
Gain (loss) on sold of treasury shares | R$ 22,106,000 | R$ 25,163,000 |

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