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Note 12 Other comprehensive income, changes in gains or losses (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Financial assets at fair value throught other comprehensive income [Line Items] |  |
Fair value changes of debt instruments measured at fair value through other comprehensive income that may be reclassified to profit or loss | € (576) |
Fair value changes of equity instruments measured at fair value through other comprehensive income that will not be reclassified to profit or loss | (905) |
Fair value changes of debt instruments measured at fair value through other comprehensive income that may be reclassified to profit or loss | (257) | € (576)
Fair value changes of equity instruments measured at fair value through other comprehensive income that will not be reclassified to profit or loss | (779) | (905)
Debt securities [Member] |  |
Financial assets at fair value throught other comprehensive income [Line Items] |  |
Fair value changes of debt instruments measured at fair value through other comprehensive income that may be reclassified to profit or loss | (576) | (357)
Valuation gains and losses | 231 | (568)
Amounts transferred to income | 219 | 247
Income tax and other | (131) | 101
Fair value changes of debt instruments measured at fair value through other comprehensive income that may be reclassified to profit or loss | (257) | (576)
equity instruments [Member] |  |
Financial assets at fair value throught other comprehensive income [Line Items] |  |
Fair value changes of equity instruments measured at fair value through other comprehensive income that will not be reclassified to profit or loss | (905) | (1,112)
Valuation gains and losses | 133 | 228
Amounts transferred to reserves | 2 | 0
Income tax and other | (10) | (20)
Fair value changes of equity instruments measured at fair value through other comprehensive income that will not be reclassified to profit or loss | € (779) | € (905)

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