| r0.c0 | Number of still for sale now delivered new buildings owner-occupied facilities/Current | bzk-ww-i:HousingFacilitiesOwnerOccupiedForSaleDeliveredNewBuildings | xbrli:nonNegativeIntegerItemType | duration | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam |
| r1.c0 | Number of still for sale new buildings under construction owner-occupied facilities/Current | bzk-ww-i:HousingFacilitiesOwnerOccupiedForSaleUnderConstructionNewBuildings | xbrli:nonNegativeIntegerItemType | duration | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam |
| r2.c0 | Number of still for sale existing owner-occupied facilities (VOV) purchased for resale, but not yet resold/Current | bzk-ww-i:HousingFacilitiesOwnerOccupiedForSaleExistingBuildings | xbrli:nonNegativeIntegerItemType | duration | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam |