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Income Taxes - Difference between the Expected Tax Expense (Benefit) at Domestic Income Tax Rate and Actual Income Tax Expense (Benefit) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Analysis of the Difference between the expected tax and actual tax [Line Items]      
Effect of changes in tax law and/or tax rate € (234)    
Deutsche Bank AG      
Analysis of the Difference between the expected tax and actual tax [Line Items]      
Expected tax expense (benefit) at domestic income tax rate of 31.3% (31.3% for 2024 and 31.3% for 2023) 2,839 € 2,098 € 2,490
Foreign rate differential (346) (192) (85)
Tax-exempt gains on securities and other income (302) (246) (319)
Loss (income) on equity method investments 0 (6) 0
Nondeductible expenses 233 520 392
Impairments of goodwill 0 0 55
Changes in recognition and measurement of deferred tax assets [1] (4) (59) (1,238)
Effect of changes in tax law and/or tax rate (235) 23 7
Effect related to share-based payments 0 (1) 0
Other [1] 70 85 201
Total income tax expense (benefit) € 2,255 € 2,223 € 1,503
[1] 1Current and deferred tax expense (benefit) relating to prior years are mainly reflected in the line items “Changes in recognition and measurement of deferred tax assets”
and “Other”