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Note 13 Other comprehensive income Changes in gains or losses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
 [2]
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 € (357) € (809) [1],[2] € 1,274
Fair value changes of equity instruments measured at fair value through other comprehensive income that will not be reclassified to profit or loss (1,112) (1,194) [1],[2] (1,079)
Fair value changes of debt instruments measured at fair value through other comprehensive income that may be reclassified to profit or loss (576) (357) (809) [1]
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) (1,194) [1]
Debt securities [Member]      
Financial assets at fair value throught other comprehensive income [Line Items]      
Valuation gains and losses (568) 659 (3,049)
Amounts transferred to income 247 5 20
Income tax and other 101 (211) 946
equity instruments [Member]      
Financial assets at fair value throught other comprehensive income [Line Items]      
Valuation gains and losses 228 80 (112)
Amounts transferred to reserves 0 2 (2)
Income tax and other € (20) € (1) € (1)
[1]
(1) Balances corresponding to 2022 have been restated according to IFRS 17 (see Note 1.3).
[2] (1) Balances corresponding to 2022 have been restated according to IFRS 17 (see Note 1.3).