v3.25.4
Business Segments and Related Information - Segment Results of Operations (Detail: Text Values) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]      
Increase of net interest income in Investment Bank due to presentation of tax-exempt securities as fully taxable, offset by reversal in Corporate and Other € 22 € 18 € 10
Segment Results of Operations, Text Values      
Disclosure of operating segments [line items]      
Increase in noninterest expenses due to changes in segment structure in Corporate Bank     175
Decrease in noninterest expenses due to changes in segment structure in Investment Bank     42
Decrease in noninterest expenses due to changes in segment structure in Private Bank     48
Decrease in noninterest expenses due to changes in segment structure in Asset Management     0
Decrease in noninterest expenses due to changes in segment structure in Corporate and Other     € 84
Tax rate used in determining the fully taxable-equivalent of net interest income in respect of the majority of the US tax-exempt securities 21.00% 21.00% 21.00%
Effective tax rate for the Group, reflected in the post-tax return on average tangible shareholders equity and average shareholders equity at the Group level 25.00% 33.00% 19.00%
Effective tax rate for the group adjusted to exclude the impact of permanent differences not attributed to the segments, reflected in the post-tax return on average tangible shareholders equity and average shareholders equity of the segments 28.00% 28.00% 28.00%