v3.26.1
Intangible assets - Narrative (Details) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2026
Apr. 30, 2026
Dec. 31, 2025
Disclosure of information for cash-generating units [line items]      
Increase (decrease) in goodwill € 1,185    
Goodwill 13,143   € 11,958
Impairment loss recognised in profit or loss, goodwill € 0    
TSB Banking Group Limited      
Disclosure of information for cash-generating units [line items]      
Goodwill   € 777