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Risk management - Schedule of regulatory capital alternative standard (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Risk Management [Abstract] |  |  |  |
Common Equity Tier I | € 84,739 | € 79,800 | € 76,741 |
Share capital | 7,345 | 7,576 | 8,092 | € 8,397
(-) Treasure shares and own shares financed | (1,892) | (1,694) | (2,847) |
Share Premium | 36,792 | 40,079 | 44,373 |
Reserves | 84,663 | 76,608 | 68,721 |
Other retained earnings | (39,918) | (38,617) | (35,038) |
Minority interests | 9,037 | 8,479 | 6,899 |
Profit net of dividends | 10,576 | 9,431 | 8,307 |
Deductions | (21,863) | (22,061) | (21,766) |
Goodwill and intangible assets | (15,037) | (15,957) | (17,220) |
Others | (6,826) | (6,104) | (4,546) |
Additional Tier I | 9,645 | 10,371 | 9,002 |
Eligible instruments AT1 | 8,937 | 9,725 | 8,461 |
AT1-excesses-subsidiaries | 708 | 645 | 541 |
Tier II | 17,460 | 18,418 | 16,497 |
Eligible instruments T2 | 17,754 | 18,869 | 17,101 |
Excess IRB provision on PE | 0 | 0 | 76 |
T2-excesses - subsidiaries | (294) | (450) | (680) |
Total eligible capital | € 111,845 | € 108,589 | € 102,240 |

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