Income Taxes - Major Components of Gross Deferred Income Tax Assets and Liabilities (Detail: Text value) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Income Taxes [Abstract]
Corporate minimum tax included in unused tax credit	€ 322	€ 151
Deferred tax assets for entities which suffer a loss	241	4,000
Temporary differences associated with the Group's parent company's investments in subsidiaries, branches and associates and interests in joint ventures of which no deferred tax liabilities were recognized	€ 259	€ 286

Temporary differences associated with the Group's parent company's investments in subsidiaries, branches and associates and interests in joint ventures of which no deferred tax liabilities were recognized

No definition available.

Name:	db_TemporaryDifferencesAssociatedWithTheGroupsParentCompanysInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVenturesOfWhichNoDeferredTaxLiabilitiesWereRecognized
Namespace Prefix:	db_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration