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Provisions - Schedule of insurance contracts linked to pensions (Details) - Spain - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Post-employment plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Fair value of insurance contracts linked to pensions at beginning of year | € 81 | € 93 | € 104
Incorporation of Group companies, net | 0 | 0 | 0
Expected return on insurance contracts linked to pensions | 3 | 3 | 4
Benefits paid | (12) | (13) | (15)
Paid premiums | 0 | 0 | 0
Actuarial gains/(losses) | (5) | (2) | 0
Fair value of insurance contracts linked to pensions at end of year | 67 | 81 | 93
Other similar obligations |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Fair value of insurance contracts linked to pensions at beginning of year | 0 | 0 | 0
Incorporation of Group companies, net | 0 | 0 | 0
Expected return on insurance contracts linked to pensions | 0 | 0 | 0
Benefits paid | 0 | 0 | 0
Paid premiums | 0 | 0 | 0
Actuarial gains/(losses) | 0 | 0 | 0
Fair value of insurance contracts linked to pensions at end of year | € 0 | € 0 | € 0

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Expected return on insurance contracts linked to pensions. + References No definition available. + Details
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- Definition Insurance contracts linked to pensions + References No definition available. + Details
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- Definition Increase in insurance contracts linked to pensions from incorporation of entities. + References No definition available. + Details
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- Definition Benefits paid from insurance contracts linked to pensions. + References No definition available. + Details
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- Definition Insurance contracts linked to pensions, increase in plan assets due to premiums paid. + References No definition available. + Details
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- Details
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