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Distribution of Banco Santander's profit, shareholder remuneration scheme and earnings per share - Schedule of basic earnings per share (Details) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Basic earnings per share [abstract] |  |  |
Profit (loss) attributable to the Parent | € 14,101 | € 12,574 | € 11,076
Remuneration of PPCC and PPCA | (622) | (620) | (492)
Profit (loss) attributable to ordinary equity holders of parent | 13,479 | 11,954 | 10,584
Profit (loss) from discontinued operations (non controlling interest net) | 962 | 822 | 717
Profit (loss) from continuing operations (PPC net) | € 12,517 | € 11,132 | € 9,867
Weighted average number of shares outstanding (in shares) | 14,890,304,840 | 15,497,607,269 | 16,172,084,714
Basic earnings (loss) per share (in euro per share) | € 0.905 | € 0.771 | € 0.654
Basic earnings (loss) per share from discontinued operations (in euro per share) | 0.065 | 0.053 | 0.044
Basic earnings (loss) per share from continuing operations (in euro per share) | € 0.840 | € 0.718 | € 0.610

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 67 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_67&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Basic earnings (loss) per share from continuing operations. [Refer: Basic earnings (loss) per share; Continuing operations, unless line item indicates otherwise [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 67 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_67&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 70 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_a&doctype=Standard -URIDate 2025-03-27 + Details
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