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Related parties (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Associates and joint ventures |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | € 10,491 | € 10,783 | € 10,497
Liabilities | 2,978 | 3,243 | 2,480
Income statement | 1,724 | 1,776 | 1,698
Interest income | 441 | 508 | 427
Interest expense | (119) | (153) | (149)
Gains/losses on financial assets and liabilities and others | (53) | (11) | 43
Commission income | 1,546 | 1,535 | 1,499
Commission expense | (91) | (103) | (122)
Other | 3,732 | 4,712 | 4,189
Financial guarantees granted and Others | 11 | 18 | 10
Loan commitments and Other commitments granted | 335 | 317 | 274
Derivative financial instruments | 3,386 | 4,377 | 3,905
Associates and joint ventures | Financial liabilities: credit institutions |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 26 | 228 | 463
Associates and joint ventures | Financial liabilities: customers |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 2,761 | 2,810 | 1,727
Associates and joint ventures | Marketable debt securities |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Associates and joint ventures | Others |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 191 | 205 | 290
Associates and joint ventures | Cash, cash balances at central banks and other deposits on demand |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 2 | 163 | 154
Associates and joint ventures | Loans and advances: credit institutions |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 286 | 407 | 405
Associates and joint ventures | Loans and advances: customers |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 9,835 | 9,750 | 9,275
Associates and joint ventures | Debt securities |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 160 | 229 | 391
Associates and joint ventures | Others |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 208 | 234 | 272
Members of the board of directors |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Liabilities | 10 | 9 | 14
Income statement | 0 | 0 | 0
Interest income | 0 | 0 | 0
Interest expense | 0 | 0 | 0
Gains/losses on financial assets and liabilities and others | 0 | 0 | 0
Commission income | 0 | 0 | 0
Commission expense | 0 | 0 | 0
Other | 4 | 4 | 3
Financial guarantees granted and Others | 3 | 3 | 2
Loan commitments and Other commitments granted | 1 | 1 | 1
Derivative financial instruments | 0 | 0 | 0
Members of the board of directors | Financial liabilities: credit institutions |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Members of the board of directors | Financial liabilities: customers |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 10 | 9 | 14
Members of the board of directors | Marketable debt securities |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Members of the board of directors | Others |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Members of the board of directors | Cash, cash balances at central banks and other deposits on demand |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Members of the board of directors | Loans and advances: credit institutions |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Members of the board of directors | Loans and advances: customers |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Members of the board of directors | Debt securities |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Members of the board of directors | Others |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Senior Management |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 18 | 14 | 12
Liabilities | 5 | 7 | 5
Income statement | 0 | 0 | 0
Interest income | 0 | 0 | 0
Interest expense | 0 | 0 | 0
Gains/losses on financial assets and liabilities and others | 0 | 0 | 0
Commission income | 0 | 0 | 0
Commission expense | 0 | 0 | 0
Other | 3 | 3 | 2
Financial guarantees granted and Others | 2 | 2 | 1
Loan commitments and Other commitments granted | 1 | 1 | 1
Derivative financial instruments | 0 | 0 | 0
Senior Management | Financial liabilities: credit institutions |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Senior Management | Financial liabilities: customers |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 5 | 7 | 5
Senior Management | Marketable debt securities |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Senior Management | Others |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Senior Management | Cash, cash balances at central banks and other deposits on demand |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Senior Management | Loans and advances: credit institutions |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Senior Management | Loans and advances: customers |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 18 | 14 | 12
Senior Management | Debt securities |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Senior Management | Others |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Other related parties |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 295 | 226 | 186
Liabilities | 376 | 292 | 150
Income statement | 7 | 4 | 11
Interest income | 8 | 9 | 9
Interest expense | (4) | (5) | (1)
Gains/losses on financial assets and liabilities and others | 0 | 0 | 0
Commission income | 4 | 1 | 3
Commission expense | (1) | (1) | 0
Other | 189 | 216 | 1,094
Financial guarantees granted and Others | 61 | 64 | 861
Loan commitments and Other commitments granted | 38 | 20 | 9
Derivative financial instruments | 90 | 132 | 224
Other related parties | Financial liabilities: credit institutions |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Other related parties | Financial liabilities: customers |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 376 | 292 | 150
Other related parties | Marketable debt securities |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Other related parties | Others |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Liabilities | 0 | 0 | 0
Other related parties | Cash, cash balances at central banks and other deposits on demand |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Other related parties | Loans and advances: credit institutions |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 0 | 0 | 0
Other related parties | Loans and advances: customers |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 274 | 221 | 185
Other related parties | Debt securities |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | 2 | 5 | 1
Other related parties | Others |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets | € 19 | € 0 | € 0

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