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Provisions - Schedule of defined benefit obligation expenses recognized in the consolidated income statements (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit expense in profit or loss, defined benefit plans | € 41 | € 45 | € 42
Post-employment plans | Spain |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 5 | 3 | 2
Interest cost (net) | 27 | 28 | 42
Expected return on insurance contracts linked to pensions | (3) | (3) | (4)
Actuarial (gains)/losses recognised in the year | 0 | 0 | 0
Past service cost | 0 | 3 | 2
Pre-retirement cost | 0 | 0 | 0
Other | (16) | (10) | (1)
Post-employment benefit expense in profit or loss, defined benefit plans | 13 | 21 | 41
Other similar obligations | Spain |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 1 | 1 | 1
Interest cost (net) | 27 | 25 | 30
Expected return on insurance contracts linked to pensions | 0 | 0 | 0
Actuarial (gains)/losses recognised in the year | (19) | 0 | 7
Past service cost | 0 | 0 | 13
Pre-retirement cost | 389 | 303 | 160
Other | 0 | (4) | (1)
Post-employment benefit expense in profit or loss, defined benefit plans | € 398 | € 325 | € 210

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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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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_5&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_135_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Actuarial (gains)/losses recognized in the year related to defined benefits. + References No definition available. + Details
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- Definition Amount of interest expense net recognized related to defined benefit plan. + References No definition available. + Details
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- Definition Amount of service cost expense recognized related to defined benefit plan. + 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 Other costs or gains charged to income statement related to defined benefits. + References No definition available. + Details
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- Definition Past service cost charged to income statement related to defined benefits. + References No definition available. + Details
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- Definition Pre-retirement cost charged to income statement related to defined benefits. + References No definition available. + Details
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