v3.25.4
Derivatives - Value of Derivatives Held as Fair Value Hedges (Detail) - Derivatives held as fair value hedges - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Value of Derivatives held as Fair Value Hedges [line items]    
Assets € 2,966 € 2,546
Liabilities 4,494 6,282
Nominal
amount 122,199 108,170
Fair Value
changes used
for hedge
effectiveness 1,247 671
Result of fair value hedges € 370 € 454