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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, 2023
Dec. 31, 2022
Debt securities [Member]    
Financial assets at fair value throught other comprehensive income [Line Items]    
Other comprehensive income changes in gains and losses [1] € (809) € 1,274
Valuation gains and losses (166) (3,049) [1]
Amounts transferred to income 0 20 [1]
Income tax and other 32 946 [1]
Other comprehensive income changes in gains and losses (943) (809) [1]
equity instruments [Member]    
Financial assets at fair value throught other comprehensive income [Line Items]    
Other comprehensive income changes in gains and losses (1,194) (1,079)
Valuation gains and losses 123 (112)
Amounts transferred to reserves (9) (2)
Income tax and other 3 (1)
Other comprehensive income changes in gains and losses € (1,077) € (1,194)
[1] (1) Figures restated due to the application of IFRS 17 (see Notes 1.3 and 2.1)