v3.25.4
Taxation - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset for right of use assets € 164 € 178 € 195
Deferred taxes for lease liabilities 181 197 217
Change through net result (739) 251 1,059
Changes in cash flow hedge reserve (43) (138) (251)
Deferred tax liability (asset) (1,108) (208) € (362)
Change through equity € 137 € 103  
Effective tax rate 27.10% 28.10% 27.50%
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Change through net result € 21 € (9)  
Deferred tax liability (asset) (139) (208) € (154)
Change through equity (57) 41  
Loans and advances      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Change through net result (42) (49)  
Deferred tax liability (asset) 376 427 475
Change through equity (1)  
Cash flow hedges      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Change through net result  
Changes in cash flow hedge reserve (43)    
Deferred tax liability (asset) 322 363 502
Change through equity 43 138  
Financial assets and liabilities at FVPL      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Change through net result (694) 441  
Deferred tax liability (asset) (1,715) (1,008) € (1,461)
Change through equity