v3.26.1
Equity - Summary of equity (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Share capital and share premium        
            -  Share capital € 29 € 30    
            -  Share premium 17,116 17,116    
Total share capital and share premium 17,146 17,147    
Other reserves        
Revaluation reserve: Cash flow hedge (1,198) (1,096)    
Revaluation reserve: Credit liability (71) (49)    
Revaluation reserve: Property in own use 154 156    
Net defined benefit asset/liability remeasurement reserve (313) (345)    
Currency translation reserve (2,476) (2,774)    
Share of associates and joint ventures and other reserves 1,868 2,031    
Treasury shares (1,454) (2,404)   € (765)
Non-controlling interests (2,058) (3,080)    
Retained earnings 39,225 40,016    
Shareholders’ equity (parent) 54,313 54,083    
Non-controlling interests 1,141 1,255    
Total equity 55,454 55,339 € 53,321 € 53,698
Equity securities at FVOCI        
Other reserves        
Revaluation reserve: Equity securities and Debt instruments at FVOCI 1,468 1,444    
Debt instruments at FVOCI        
Other reserves        
Revaluation reserve: Equity securities and Debt instruments at FVOCI € (37) € (41)