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Hedging derivatives - Schedule of effectiveness of hedging, impacts on profit or loss and other comprehensive income (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | € 1,199 | € 978 | € 704
Ineffective recognised in the income statement | 11 | 16 | 63
Reclassified amount of reserves to the income statement | (706) | (1,256) | (2,622)
Fair value hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 0 | 0 | 0
Ineffective recognised in the income statement | 7 | 22 | 59
Fair value hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 0 | 0 | 0
Ineffective recognised in the income statement | (33) | 30 | 72
Fair value hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 0 | 0 | 0
Ineffective recognised in the income statement | 3 | (17) | (38)
Fair value hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 0 | 0 | 0
Ineffective recognised in the income statement | (9) | 9 | 25
Fair value hedges | Inflation risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Ineffective recognised in the income statement | 46 |  |
Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 1,049 | 558 | 2,592
Cash flow hedges | C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 1,063 | 558 | 2,592
Ineffective recognised in the income statement | 4 | (6) | 4
Reclassified amount of reserves to the income statement | (706) | (1,256) | (2,622)
Cash flow hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 1,155 | 163 | 2,179
Cash flow hedges | Interest rate risk | C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 1,174 | 163 | 2,179
Ineffective recognised in the income statement | (3) | (12) | 2
Reclassified amount of reserves to the income statement | (638) | (1,166) | (1,647)
Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | (229) | 312 | 7
Cash flow hedges | Currency risk | C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | (240) | 312 | 7
Ineffective recognised in the income statement | 7 | 20 | (1)
Reclassified amount of reserves to the income statement | 85 | 319 | (416)
Cash flow hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 8 | 155 | 164
Cash flow hedges | Interest rate and exchange rate risk | C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 8 | 155 | 164
Ineffective recognised in the income statement | (10) | (14) | 2
Reclassified amount of reserves to the income statement | (233) | (340) | (431)
Cash flow hedges | Inflation risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 131 | (70) | 233
Reclassified amount of reserves to the income statement | 80 | (69) | (128)
Cash flow hedges | Inflation risk | C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 131 | (70) | 233
Ineffective recognised in the income statement |  | 0 | 1
Reclassified amount of reserves to the income statement | 80 | (69) | (128)
Cash flow hedges | Equity risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | (16) | (2) | 9
Cash flow hedges | Equity risk | C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | (10) | (2) | 9
Ineffective recognised in the income statement | 10 | 0 | 0
Reclassified amount of reserves to the income statement | 0 | 0 | 0
Net foreign investments hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 136 | 420 | (1,888)
Net foreign investments hedges | C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 136 | 420 | (1,888)
Ineffective recognised in the income statement | 0 | 0 | 0
Reclassified amount of reserves to the income statement | 0 | 0 | 0
Net foreign investments hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 136 | 420 | (1,888)
Net foreign investments hedges | Currency risk | C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings/(losses) recognised in another cumulative overall result | 136 | 420 | (1,888)
Ineffective recognised in the income statement | 0 | 0 | 0
Reclassified amount of reserves to the income statement | € 0 | € 0 | € 0

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