| r0.c0 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of rental housing units | bzk-aw-wsw-i:NumberOfRentalHousingUnits | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c1 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of rental housing units cheap (limit 2018 € 417,34) | bzk-aw-wsw-i:NumberOfRentalHousingUnitsCheap | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c2 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of rental housing units affortable (limit 2018 € 640,14) | bzk-aw-wsw-i:NumberOfRentalHousingUnitsAffordable | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c3 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of rental housing facilities expensive until rent allowance limit (limit 2018 € 710,68) | bzk-aw-wsw-i:NumberOfRentalHousingUnitsExpensiveUntilRentAllowanceLimit | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c4 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of rental housing facilities expensive from rent allowance limit (limit 2018 € 710,68) | bzk-aw-wsw-i:NumberOfRentalHousingUnitsExpensiveFromRentAllowanceLimit | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c5 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of non housing units | bzk-aw-wsw-i:NumberOfNonHousingUnits | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c6 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of intramural healthcare real estate | bzk-aw-wsw-i:NumberOfIntramuralHealthcareRealEstate | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c7 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of non housing units; social real estate | bzk-aw-wsw-i:NumberOfNonHousingUnitsSocialRealEstate | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c8 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of non housing units; business premises/shops | bzk-aw-wsw-i:NumberOfNonHousingUnitsBusinessPremisesShops | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c9 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Number of non housing units: parking facilities | bzk-aw-wsw-i:NumberOfNonHousingUnitsParkingFacilities | xbrli:nonNegativeIntegerItemType | instant | * | N/A | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c10 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Forecast reporting year | | | | * | $FinancialReportingPeriodCurrentEndDateParam | N/A | N/A |
| r0.c11 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/First forecast year | | | | * | $FinancialReportingPeriodFirstPeriodEndDateParam | N/A | N/A |
| r0.c12 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Second forecast year | | | | * | $FinancialReportingPeriodSecondPeriodEndDateParam | N/A | N/A |
| r0.c13 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Third forecast year | | | | * | $FinancialReportingPeriodThirdPeriodEndDateParam | N/A | N/A |
| r0.c14 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Fourth forecast year | | | | * | $FinancialReportingPeriodFourthPeriodEndDateParam | N/A | N/A |
| r0.c15 | bzk-table_OverviewNumberOfRentalHousingUnitsNonHousingUnitsPerMunicipalityHousingDpiTable-y/Fifth forecast year | | | | * | $FinancialReportingPeriodFifthPeriodEndDateParam | N/A | N/A |