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Note 13 Other comprehensive income Changes in gains or losses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt securities [Member]      
Financial assets at fair value throught other comprehensive income [Line Items]      
Other comprehensive income changes in gains and losses € 2,069 € 1,760 € 943
Valuation gains and losses (1,058) 489 1,267
Amounts transferred to income (63) (72) (119)
Income tax and other 325 (107) (331)
Other comprehensive income changes in gains and losses 1,274 2,069 1,760
equity instruments [Member]      
Financial assets at fair value throught other comprehensive income [Line Items]      
Other comprehensive income changes in gains and losses (1,256) (403) (155)
Valuation gains and losses 183 (803) (238)
Amounts transferred to reserves 0 (73) 0
Income tax and other (7) 23 (10)
Other comprehensive income changes in gains and losses € (1,079) € (1,256) € (403)