| r0.c0 | Investments in participating interests in group companies/Current | venj-bw2-i:InvestmentsInParticipatingInterestsInGroupCompanies | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r0.c1 | Investments in participating interests in group companies/Previous | venj-bw2-i:InvestmentsInParticipatingInterestsInGroupCompanies | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r1.c0 | Non-current receivables from group companies/Current | venj-bw2-i:ReceivablesGroupCompaniesNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r1.c1 | Non-current receivables from group companies/Previous | venj-bw2-i:ReceivablesGroupCompaniesNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r2.c0 | Other investments in participating interests/Current | venj-bw2-i:InvestmentsInParticipatingInterestsOther | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r2.c1 | Other investments in participating interests/Previous | venj-bw2-i:InvestmentsInParticipatingInterestsOther | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r3.c0 | Non-current receivables from shareholders and participating interests/Current | venj-bw2-i:ReceivablesShareholdersParticipatingInterestsNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r3.c1 | Non-current receivables from shareholders and participating interests/Previous | venj-bw2-i:ReceivablesShareholdersParticipatingInterestsNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r4.c0 | Non-current deferred tax assets/Current | rj-i:DeferredTaxAssetsNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r4.c1 | Non-current deferred tax assets/Previous | rj-i:DeferredTaxAssetsNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r5.c0 | Loans granted/Current | bzk-ti-i:LoansGranted | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r5.c1 | Loans granted/Previous | bzk-ti-i:LoansGranted | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r6.c0 | Non-current other securities/Current | venj-bw2-i:SecuritiesOtherNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r6.c1 | Non-current other securities/Previous | venj-bw2-i:SecuritiesOtherNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r7.c0 | Receivables BWS subsidies (non-current)/Current | bzk-ti-i:ReceivablesBWSSubsidiesNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r7.c1 | Receivables BWS subsidies (non-current)/Previous | bzk-ti-i:ReceivablesBWSSubsidiesNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r8.c0 | Non-current other receivables/Current | venj-bw2-i:ReceivablesOtherNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r8.c1 | Non-current other receivables/Previous | venj-bw2-i:ReceivablesOtherNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r9.c0 | Financial assets/Current | venj-bw2-i:FinancialAssets | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |
| r9.c1 | Financial assets/Previous | venj-bw2-i:FinancialAssets | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:CompoundMember |