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Loans and advances to customers - Schedule of changes in the impairment losses for loans and advances to customers (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period | € 283,497 | € 243,203 |
Financial assets at end of period | 300,026 | 283,497 | € 243,203
Customers |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period | 1,054,069 | 1,036,349 |
Financial assets at end of period | 1,037,288 | 1,054,069 | 1,036,349
Customers | Gross carrying amount |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period | 1,076,194 | 1,059,137 |
Financial assets at end of period | 1,058,446 | 1,076,194 | 1,059,137
Customers | Financial instruments credit-impaired |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Net additions | 13,648 | 13,779 | 14,944
Written-off assets | (13,266) | (13,212) | (13,847)
Changes in the scope of consolidation | 0 | 17 | (59)
Exchange differences and other | (2,536) | (947) | 168
Customers | Financial instruments credit-impaired | Gross carrying amount |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period | 33,731 | 34,094 | 32,888
Financial assets at end of period | € 31,577 | € 33,731 | € 34,094

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