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Equity instruments - Changes - (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]      
Balance at beginning of year € 120,953 € 125,708  
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (EIGR) (3,063) 692 € 2,588
Balance at end of year 108,038 120,953 125,708
Equity instruments      
Disclosure of financial assets [line items]      
Balance at beginning of year 2,783 2,863 2,671
Net additions (disposals) (276) 833 177
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (EIGR) (171) (917) (29)
Changes in the RV hedged with micro-hedging transactions 117 4 44
Balance at end of year € 2,453 € 2,783 € 2,863