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Equity - Summary of equity (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share capital and share premium        
Share capital € 31 € 35 € 37 € 39
Share premium 17,116 17,116 17,116 17,105
Total share capital and share premium 17,148 17,151 17,154  
Other reserves        
Reserve of cash flow hedges (1,693) (2,058) (3,055)  
Revaluation reserves credit liability (15) 31 70  
Revaluation reserve: Property in own use 161 178 176  
Net defined benefit asset/liability remeasurement reserve (333) (317) (232)  
Currency translation reserve (1,986) (2,527) (2,395)  
Share of associates and joint ventures and other 2,607 3,047 3,603  
Treasury shares (765) (1,994) (1,205) (1,612)
Other reserves (687) (2,767) (2,192)  
Retained earnings 36,243 40,299 41,538  
Shareholders’ equity (parent) 52,703 54,684 56,500  
Non-controlling interests 995 944 504  
Total equity 53,698 55,628 57,004 € 52,802
Equity securities at FVOCI        
Other reserves        
Revaluation reserve: equity securities at FVOCI 1,816 1,152 1,187  
Revaluation reserve: debt instruments at FVOCI 1,816 1,152 1,187  
Debt instruments at FVOCI        
Other reserves        
Revaluation reserve: equity securities at FVOCI (479) (280) (341)  
Revaluation reserve: debt instruments at FVOCI € (479) € (280) € (341)