| r0.c0 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y/Branch | bzk-ww-i:BranchActivity | bzk-ww-codes:branchItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | N/A |
| r0.c1 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y/Number of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailNumber | xbrli:nonNegativeIntegerItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | N/A |
| r0.c2 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y/Year of delivery of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailDeliveryYear | bzk-ww-types:gYearRangeItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | N/A |
| r0.c3 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y/Foundation expenses of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailFoundationExpenses | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | N/A |
| r0.c4 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y/Market value (mutation) of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailMarketValueMutation | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | N/A |
| r0.c5 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y/Policy value (mutation) of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailPolicyValueMutation | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | N/A |
| r0.c6 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y/Cash in flows of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailCashInflows | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | N/A |
| r0.c7 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y/Cash out flows of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailCashOutflows | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | N/A |
| r1.c0 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y.1/Branch | bzk-ww-i:BranchActivity | bzk-ww-codes:branchItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r1.c1 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y.1/Number of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailNumber | xbrli:nonNegativeIntegerItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r1.c2 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y.1/Year of delivery of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailDeliveryYear | bzk-ww-types:gYearRangeItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r1.c3 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y.1/Foundation expenses of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailFoundationExpenses | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r1.c4 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y.1/Market value (mutation) of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailMarketValueMutation | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r1.c5 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y.1/Policy value (mutation) of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailPolicyValueMutation | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r1.c6 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y.1/Cash in flows of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailCashInflows | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |
| r1.c7 | bzk-table_1Periode3PeriodesPrognoseTypeJaarrekening3DynamischeAssenDuration_ActivitiesOverviewDetailConsolidatedHousingDpiTable-y.1/Cash out flows of activities overview (detail) | bzk-ww-i:ActivitiesOverviewDetailCashOutflows | nl-types:monetaryNoDecimals20ItemType | duration | * | * | * | $BasisOfPreparationParam | jenv-bw2-dm:ConsolidatedMember | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam |