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Risk management - Schedule of reconciliation of accounting capital with regulatory capital (Details) - EUR (€) € in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Risk Management [Abstract] |  |  |  |
Subscribed capital | € 7,345 | € 7,576 | € 8,092 | € 8,397
Share premium account | 36,792 | 40,079 | 44,373 |
Reserves | 84,700 | 76,568 | 69,278 |
Treasury shares | (96) | (68) | (1,078) |
Attributable profit | 14,101 | 12,574 | 11,076 |
Approved dividend | (1,698) | (1,532) | (1,298) |
Shareholders’ equity on public balance sheet | 141,144 | 135,197 | 130,443 |
Valuation adjustments | (37,973) | (36,596) | (35,020) |
Non-controlling interests | 9,578 | 8,726 | 8,818 |
TOTAL EQUITY | 112,748 | 107,327 | 104,241 | € 97,585
Goodwill and intangible assets | (15,037) | (16,098) | (17,313) |
Eligible preference shares and participating securities | 9,645 | 10,371 | 9,002 |
Accrued dividend | (1,827) | (1,611) | (1,471) |
Other adjustments | (11,146) | (9,817) | (8,717) |
Tier 1 | € 94,383 | € 90,172 | € 85,742 |
Ordinary profit assumption | 25.00% |  |  |

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