v3.25.4
Financial Instruments Carried at Fair Value - Sensitivity Analysis by Type (Detail: Text Values) - Valuation
technique
unobservable
parameters
(Level 3)
€ in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Positive fair value
movement from
using reasonable
possible alternatives    
Sensitivity Analysis by Type of Instrument [Line Items]    
Sensitivity Analysis by Type of Instrument [1] € 2,094 € 2,052
Changes in sensitive amounts during the year € 42  
Changes in sensitive amounts during the year in percent 0.02  
Negative fair value
movement from
using reasonable
possible alternatives    
Sensitivity Analysis by Type of Instrument [Line Items]    
Sensitivity Analysis by Type of Instrument [1] € 1,294 € 1,343
Changes in sensitive amounts during the year € 48  
Changes in sensitive amounts during the year in percent 0.04  
[1] Where the exposure to an unobservable parameter is offset across different instruments then only the net impact is disclosed in the table