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Provisions - Schedule of provision for pensions and similar obligations (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of other provisions [line items] |  |  |  |
Provisions | € 8,355 | € 8,407 | € 8,441 | € 8,149
Provisions for defined benefits | 2,637 | 2,638 | 3,097 |
Provision for pensions and other obligations post -employments and Other long term employee benefits |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 2,649 | 2,646 | 3,105 |
Post-employment plans |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 1,656 | 1,731 | 2,225 | 2,392
Other long term employee benefits |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 993 | 915 | 880 | € 950
Spain |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions for pre-retirements | 916 | 839 | 805 |
Spain | Post-employment plans |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 602 | 674 | 770 |
Spain | Other long term employee benefits |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 927 | 852 | 817 |
United Kingdom | Post-employment plans |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 26 | 28 | 76 |
Other subsidiaries | Post-employment plans |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 1,028 | 1,029 | 1,379 |
Other subsidiaries | Other long term employee benefits |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | € 66 | € 63 | € 63 |

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- Definition The amount of liabilities of uncertain timing or amount, including provisions for employee benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph l -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_l&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Provisions for defined benefits. + References No definition available. + Details
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