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Note 35 Gains or losses on financial assets and liabilities and hedge accounting breakdown by nature of the financial instrument (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items] |  |
Subtotal gains or losses in financial assets and liabilities net | € 1,554 | € 1,489
Debt securities [Member] |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items] |  |
Subtotal gains or losses in financial assets and liabilities net | 368 | 73
Equity investments [member] |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items] |  |
Subtotal gains or losses in financial assets and liabilities net | 884 | 289
Derivatives [member] |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items] |  |
Subtotal gains or losses in financial assets and liabilities net | (363) | (17)
Loans and advances to customers [Member] |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items] |  |
Subtotal gains or losses in financial assets and liabilities net | 30 | 256
Customer deposits [Member] |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items] |  |
Subtotal gains or losses in financial assets and liabilities net | (19) | (17)
Other [Member] |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items] |  |
Subtotal gains or losses in financial assets and liabilities net | € 654 | € 906

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