| r0.c0 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y/Number of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailNumber | xbrli:nonNegativeIntegerItemType | duration | * | * | * | N/A | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r0.c1 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y/Year of delivery of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailYearOfDelivery | xbrli:gYearItemType | duration | * | * | * | N/A | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r0.c2 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y/Foundation expenses of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailFoundationExpenses | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | N/A | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r0.c3 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y/Market value (mutation) of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailMarketValueMutation | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | N/A | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r0.c4 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y/Policy value (mutation) of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailPolicyValueMutation | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | N/A | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r0.c5 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y/Cash in flows of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailCashInflows | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | N/A | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r0.c6 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y/Cash out flows of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailCashOutflows | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | N/A | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r1.c0 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y.1/Number of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailNumber | xbrli:nonNegativeIntegerItemType | duration | * | * | * | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r1.c1 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y.1/Year of delivery of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailYearOfDelivery | xbrli:gYearItemType | duration | * | * | * | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r1.c2 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y.1/Foundation expenses of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailFoundationExpenses | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r1.c3 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y.1/Market value (mutation) of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailMarketValueMutation | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r1.c4 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y.1/Policy value (mutation) of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailPolicyValueMutation | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r1.c5 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y.1/Cash in flows of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailCashInflows | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |
| r1.c6 | bzk-table_ActivitiesOverviewDetailDaebHousingDpiTable-y.1/Cash out flows of activities overview (detail) | bzk-aw-wsw-i:ActivitiesOverviewDetailCashOutflows | nl-types:monetaryNoDecimalsItemType | duration | * | * | * | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:DAEBActivitiesMember |