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Note 13 Other comprehensive income Changes in gains or losses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt securities [Member]      
Financial assets at fair value throught other comprehensive income [Line Items]      
Other comprehensive income changes in gains and losses € 1,274 € 2,069 € 1,760
Valuation gains and losses (2,694) (1,058) 489
Amounts transferred to income 20 (63) (72)
Income tax and other 838 325 (107)
Other comprehensive income changes in gains and losses (562) 1,274 2,069
equity instruments [Member]      
Financial assets at fair value throught other comprehensive income [Line Items]      
Other comprehensive income changes in gains and losses (1,079) (1,256) (403)
Valuation gains and losses (167) 183 (803)
Amounts transferred to reserves (2) 0 (73)
Income tax and other 54 (7) 23
Other comprehensive income changes in gains and losses € (1,194) € (1,079) € (1,256)