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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, 2022
Dec. 31, 2021
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
Valuation gains and losses (2,185) (1,058)
Amounts transferred to income (11) (63)
Income tax and other 621 325
Other comprehensive income changes in gains and losses (301) 1,274
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)
Valuation gains and losses 287 183
Amounts transferred to reserves 0
Income tax and other 16 (7)
Other comprehensive income changes in gains and losses € (777) € (1,079)