| r0.c0 | Number of new buildings excluding purpose sale/Forecast reporting year | bzk-ww-i:NewBuildingsExcludingPurposeSaleNumber | bzk-ww-types:nonNegative1DecimalItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam |
| r0.c1 | Number of new buildings excluding purpose sale/First forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleNumber | bzk-ww-types:nonNegative1DecimalItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam |
| r0.c2 | Number of new buildings excluding purpose sale/Second forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleNumber | bzk-ww-types:nonNegative1DecimalItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam |
| r0.c3 | Number of new buildings excluding purpose sale/Third forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleNumber | bzk-ww-types:nonNegative1DecimalItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r0.c4 | Number of new buildings excluding purpose sale/Fourth forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleNumber | bzk-ww-types:nonNegative1DecimalItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam |
| r0.c5 | Number of new buildings excluding purpose sale/Fifth forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleNumber | bzk-ww-types:nonNegative1DecimalItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam |
| r1.c0 | Foundation costs (incl. land) of new buildings excluding purpose sale/Forecast reporting year | bzk-ww-i:NewBuildingsExcludingPurposeSaleFoundationExpensesIncludingLand | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam |
| r1.c1 | Foundation costs (incl. land) of new buildings excluding purpose sale/First forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleFoundationExpensesIncludingLand | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam |
| r1.c2 | Foundation costs (incl. land) of new buildings excluding purpose sale/Second forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleFoundationExpensesIncludingLand | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam |
| r1.c3 | Foundation costs (incl. land) of new buildings excluding purpose sale/Third forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleFoundationExpensesIncludingLand | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r1.c4 | Foundation costs (incl. land) of new buildings excluding purpose sale/Fourth forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleFoundationExpensesIncludingLand | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam |
| r1.c5 | Foundation costs (incl. land) of new buildings excluding purpose sale/Fifth forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleFoundationExpensesIncludingLand | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam |
| r2.c0 | Market value of new buildings excluding purpose sale/Forecast reporting year | bzk-ww-i:NewBuildingsExcludingPurposeSaleMarketValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam |
| r2.c1 | Market value of new buildings excluding purpose sale/First forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleMarketValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam |
| r2.c2 | Market value of new buildings excluding purpose sale/Second forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleMarketValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam |
| r2.c3 | Market value of new buildings excluding purpose sale/Third forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleMarketValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r2.c4 | Market value of new buildings excluding purpose sale/Fourth forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleMarketValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam |
| r2.c5 | Market value of new buildings excluding purpose sale/Fifth forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSaleMarketValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam |
| r3.c0 | Policy value of new buildings excluding purpose sale/Forecast reporting year | bzk-ww-i:NewBuildingsExcludingPurposeSalePolicyValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam |
| r3.c1 | Policy value of new buildings excluding purpose sale/First forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSalePolicyValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam |
| r3.c2 | Policy value of new buildings excluding purpose sale/Second forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSalePolicyValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam |
| r3.c3 | Policy value of new buildings excluding purpose sale/Third forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSalePolicyValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r3.c4 | Policy value of new buildings excluding purpose sale/Fourth forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSalePolicyValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam |
| r3.c5 | Policy value of new buildings excluding purpose sale/Fifth forecast year | bzk-ww-i:NewBuildingsExcludingPurposeSalePolicyValue | nl-types:monetaryNoDecimals20ItemType | duration | $BasisOfPreparationParam | bzk-ww-dm:DAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam |