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Distribution of Banco Santander's profit, shareholder remuneration scheme and earnings per share - Schedule of diluted 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
Diluted earnings per share [abstract] |  |  |
Profit (loss) attributable to the Parent | € 14,101 | € 12,574 | € 11,076
Remuneration of PPCC and PPCA | (622) | (620) | (492)
Dilutive effect of changes in profit for the period arising from potential conversion of ordinary shares | 0 | 0 | 0
Profit (loss) attributable to ordinary equity holders of parent including dilutive effects | 13,479 | 11,954 | 10,584
Profit (loss) from discontinued operations (non controlling interest net) | 962 | 822 | 717
Profit (loss) from continuing operations (net of non-controlling interests and CCP) | € 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
Dilutive effect of options/rights on shares (in shares) | 85,269,647 | 70,110,570 | 75,180,407
Adjusted number of shares (in shares) | 14,975,574,487 | 15,567,717,839 | 16,247,265,121
Diluted earnings (loss) per share (in euro per share) | € 0.900 | € 0.768 | € 0.651
Diluted earnings (loss) per share from discontinued operations (in euro per share) | 0.064 | 0.053 | 0.044
Diluted earnings (loss) per share from continuing operations (in euro per share) | € 0.836 | € 0.715 | € 0.607

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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 70 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard -URIDate 2025-03-27 + Details
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