| r0.c0 | Number of new buildings/Forecast reporting year | bzk-aw-wsw-i:NewBuildingsNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c1 | Number of new buildings/First forecast year | bzk-aw-wsw-i:NewBuildingsNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c2 | Number of new buildings/Second forecast year | bzk-aw-wsw-i:NewBuildingsNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c3 | Number of new buildings/Third forecast year | bzk-aw-wsw-i:NewBuildingsNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c4 | Number of new buildings/Fourth forecast year | bzk-aw-wsw-i:NewBuildingsNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c5 | Number of new buildings/Fifth forecast year | bzk-aw-wsw-i:NewBuildingsNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c0 | Foundation costs (incl. land) of new buildings/Forecast reporting year | bzk-aw-wsw-i:NewBuildingsFoundationExpensesIncludingLand | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c1 | Foundation costs (incl. land) of new buildings/First forecast year | bzk-aw-wsw-i:NewBuildingsFoundationExpensesIncludingLand | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c2 | Foundation costs (incl. land) of new buildings/Second forecast year | bzk-aw-wsw-i:NewBuildingsFoundationExpensesIncludingLand | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c3 | Foundation costs (incl. land) of new buildings/Third forecast year | bzk-aw-wsw-i:NewBuildingsFoundationExpensesIncludingLand | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c4 | Foundation costs (incl. land) of new buildings/Fourth forecast year | bzk-aw-wsw-i:NewBuildingsFoundationExpensesIncludingLand | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c5 | Foundation costs (incl. land) of new buildings/Fifth forecast year | bzk-aw-wsw-i:NewBuildingsFoundationExpensesIncludingLand | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c0 | Market value of new buildings/Forecast reporting year | bzk-aw-wsw-i:NewBuildingsMarketValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c1 | Market value of new buildings/First forecast year | bzk-aw-wsw-i:NewBuildingsMarketValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c2 | Market value of new buildings/Second forecast year | bzk-aw-wsw-i:NewBuildingsMarketValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c3 | Market value of new buildings/Third forecast year | bzk-aw-wsw-i:NewBuildingsMarketValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c4 | Market value of new buildings/Fourth forecast year | bzk-aw-wsw-i:NewBuildingsMarketValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c5 | Market value of new buildings/Fifth forecast year | bzk-aw-wsw-i:NewBuildingsMarketValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r3.c0 | Policy value of new buildings/Forecast reporting year | bzk-aw-wsw-i:NewBuildingsPolicyValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r3.c1 | Policy value of new buildings/First forecast year | bzk-aw-wsw-i:NewBuildingsPolicyValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r3.c2 | Policy value of new buildings/Second forecast year | bzk-aw-wsw-i:NewBuildingsPolicyValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r3.c3 | Policy value of new buildings/Third forecast year | bzk-aw-wsw-i:NewBuildingsPolicyValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r3.c4 | Policy value of new buildings/Fourth forecast year | bzk-aw-wsw-i:NewBuildingsPolicyValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r3.c5 | Policy value of new buildings/Fifth forecast year | bzk-aw-wsw-i:NewBuildingsPolicyValue | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |