v3.25.2
Financial assets at fair value through other comprehensive income - Additional information (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Mar. 01, 2025
Feb. 28, 2025
Jun. 30, 2025
Dec. 31, 2024
Financial assets at FVOCI        
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]        
Exchange rate differences     € (1,385) € 506
Financial assets at FVOCI | FVOCI equity securities        
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]        
Exchange rate differences     € (226) € 62
Investment in Bank of Beijing        
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]        
Ownership interest held in equity based investments     13.00% 13.00%
Investment in Bank of Beijing | Financial assets at FVOCI        
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]        
Recoveries of amounts previously written off     € 223 € 590
Investment in Van Lanschot Kempen        
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]        
Ownership interest held in equity based investments 9.90% 2.70%    
Percentage of ownership interest acquired 7.20%