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Provisions - Provisions Narrative (Details) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 EUR (€) people | Dec. 31, 2024 EUR (€) people | Dec. 31, 2023 EUR (€) people
Disclosure of other provisions [line items] |  |  |
Number of employees accepted the pre-retirement and voluntary redundancy offers | people | 1,238 | 826 | 502
Provisions recognized to cover expenses of pre-retirement and voluntary redundancy offers | € 389 | € 303 | € 160
Contributions to defined contribution pension funds | 332 | 354 | 307
Actuarial gains and losses on defined benefit pension plans | (73) | (584) | (1,038)
Spain |  |  |
Disclosure of other provisions [line items] |  |  |
Contributions to defined contribution pension funds | 130 | 126 | 116
Actuarial gains and losses on defined benefit pension plans | € (33) | € 21 | € 10
Annual discount rate | 3.75% | 3.00% |
Spain | Post-employment plans |  |  |
Disclosure of other provisions [line items] |  |  |
Annual discount rate | 3.75% | 3.00% | 3.35%
Cumulative annual CPI growth | 2.00% | 2.00% | 2.00%
Spain | Other long term employee benefits |  |  |
Disclosure of other provisions [line items] |  |  |
Annual discount rate | 3.75% | 3.00% | 3.35%
Cumulative annual CPI growth | 2.00% | 2.00% | 2.00%
Spain | Discount rate actuarial assumptions |  |  |
Disclosure of other provisions [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |  |
Spain | Discount rate actuarial assumptions | Post-employment plans |  |  |
Disclosure of other provisions [line items] |  |  |
Increase or decrease on obligations if decrease in actuarial assumption (as a percent) | 4.02% |  |
Increase or decrease on obligations if increase in actuarial assumption (as a percent) | (3.75%) |  |
Spain | Discount rate actuarial assumptions | Other long term employee benefits |  |  |
Disclosure of other provisions [line items] |  |  |
Increase or decrease on obligations if decrease in actuarial assumption (as a percent) | 1.15% |  |
Increase or decrease on obligations if increase in actuarial assumption (as a percent) | (1.15%) |  |
United Kingdom |  |  |
Disclosure of other provisions [line items] |  |  |
Contributions to defined contribution pension funds | € 92 | € 98 | € 87
Actuarial gains and losses on defined benefit pension plans | € 117 | € 475 | € 687
Annual discount rate | 5.58% | 5.54% | 4.63%
Cumulative annual CPI growth | 2.90% | 3.11% | 3.02%
United Kingdom | Discount rate actuarial assumptions |  |  |
Disclosure of other provisions [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |  |
Increase or decrease on obligations if decrease in actuarial assumption (as a percent) | 5.82% |  |
Increase or decrease on obligations if increase in actuarial assumption (as a percent) | (5.28%) |  |
United Kingdom | Inflation rate assumption |  |  |
Disclosure of other provisions [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |  |
Increase or decrease on obligations if decrease in actuarial assumption (as a percent) | (4.14%) |  |
Increase or decrease on obligations if increase in actuarial assumption (as a percent) | 4.23% |  |
Other foreign subsidiaries |  |  |
Disclosure of other provisions [line items] |  |  |
Contributions to defined contribution pension funds | € 110 | € 133 | € 107
Actuarial gains and losses on defined benefit pension plans | € 136 | € 147 | € 247
Other foreign subsidiaries | Discount rate actuarial assumptions |  |  |
Disclosure of other provisions [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |  |
Increase or decrease on obligations if decrease in actuarial assumption (as a percent) | 3.92% |  |
Increase or decrease on obligations if increase in actuarial assumption (as a percent) | (3.53%) |  |
Brazil |  |  |
Disclosure of other provisions [line items] |  |  |
Cumulative annual CPI growth | 3.00% |  |
Brazil | Minimum |  |  |
Disclosure of other provisions [line items] |  |  |
Annual discount rate | 10.52% |  |
Brazil | Maximum |  |  |
Disclosure of other provisions [line items] |  |  |
Annual discount rate | 10.65% |  |
Brazil | Provisions for employment-related proceedings (Brazil) |  |  |
Disclosure of other provisions [line items] |  |  |
Additional provisions charged to income statement | € 524 |  |
Provision used, other provisions | 384 |  |
Brazil | Legal proceedings provision |  |  |
Disclosure of other provisions [line items] |  |  |
Additional provisions charged to income statement | 185 |  |
Provision used, other provisions | € 159 |  |

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 84 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_84_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 257 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 257 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income] + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_91_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 84 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_84_c&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 257 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_c&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 257 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_c&doctype=Standard -URIDate 2025-03-27 + Details
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