| r0.c0 | Result technical account damage insurance/Current | venj-bw2-i:ResultTechnicalAccountDamageInsurance | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r0.c1 | Result technical account damage insurance/Previous | venj-bw2-i:ResultTechnicalAccountDamageInsurance | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r1.c0 | Result technical account life insurance/Current | venj-bw2-i:ResultTechnicalAccountLifeInsurance | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r1.c1 | Result technical account life insurance/Previous | venj-bw2-i:ResultTechnicalAccountLifeInsurance | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r2.c0 | Income from investments in participating interests/Current | venj-bw2-i:IncomeFromInvestmentsInParticipatingInterests | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r2.c1 | Income from investments in participating interests/Previous | venj-bw2-i:IncomeFromInvestmentsInParticipatingInterests | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r3.c0 | Income from other investments in land and buildings/Current | venj-bw2-i:IncomeFromOtherInvestmentsInLandAndBuildings | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r3.c1 | Income from other investments in land and buildings/Previous | venj-bw2-i:IncomeFromOtherInvestmentsInLandAndBuildings | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r4.c0 | Income from other investments in other investments/Current | venj-bw2-i:IncomeFromOtherInvestmentsInInvestmentsOther | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r4.c1 | Income from other investments in other investments/Previous | venj-bw2-i:IncomeFromOtherInvestmentsInInvestmentsOther | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r5.c0 | Income from other investments/Current | venj-bw2-i:IncomeFromOtherInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r5.c1 | Income from other investments/Previous | venj-bw2-i:IncomeFromOtherInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r6.c0 | Increase in value of investments/Current | venj-bw2-i:IncreaseInValueOfInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r6.c1 | Increase in value of investments/Previous | venj-bw2-i:IncreaseInValueOfInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r7.c0 | Realised profit on investments/Current | venj-bw2-i:RealisedProfitOnInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r7.c1 | Realised profit on investments/Previous | venj-bw2-i:RealisedProfitOnInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r8.c0 | Income from investments/Current | venj-bw2-i:IncomeFromInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r8.c1 | Income from investments/Previous | venj-bw2-i:IncomeFromInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r9.c0 | Unrealised profit on investments/Current | venj-bw2-i:UnrealisedProfitOnInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r9.c1 | Unrealised profit on investments/Previous | venj-bw2-i:UnrealisedProfitOnInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r10.c0 | Allocated income from investments transferred from technical account/Current | venj-bw2-i:AllocatedIncomeFromInvestmentsTransferredFromTechnicalAccount | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r10.c1 | Allocated income from investments transferred from technical account/Previous | venj-bw2-i:AllocatedIncomeFromInvestmentsTransferredFromTechnicalAccount | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r11.c0 | Administrative expenses and interest expenses/Current | venj-bw2-i:AdministrativeExpensesAndInterestExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r11.c1 | Administrative expenses and interest expenses/Previous | venj-bw2-i:AdministrativeExpensesAndInterestExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r12.c0 | Decrease in value of investments/Current | venj-bw2-i:DecreaseInValueOfInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r12.c1 | Decrease in value of investments/Previous | venj-bw2-i:DecreaseInValueOfInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r13.c0 | Realised loss on investments/Current | venj-bw2-i:RealisedLossOnInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r13.c1 | Realised loss on investments/Previous | venj-bw2-i:RealisedLossOnInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r14.c0 | Investment expenses/Current | venj-bw2-i:InvestmentExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r14.c1 | Investment expenses/Previous | venj-bw2-i:InvestmentExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r15.c0 | Unrealised loss on investments/Current | venj-bw2-i:UnrealisedLossOnInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r15.c1 | Unrealised loss on investments/Previous | venj-bw2-i:UnrealisedLossOnInvestments | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r16.c0 | Allocated income from investments transferred to technical account damage insurance/Current | venj-bw2-i:AllocatedIncomeFromInvestmentsTransferredToTechnicalAccountDamageInsurance | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r16.c1 | Allocated income from investments transferred to technical account damage insurance/Previous | venj-bw2-i:AllocatedIncomeFromInvestmentsTransferredToTechnicalAccountDamageInsurance | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r17.c0 | Other income/Current | venj-bw2-i:IncomeOther | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r17.c1 | Other income/Previous | venj-bw2-i:IncomeOther | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r18.c0 | Other expenses/Current | venj-bw2-i:ExpensesOther | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r18.c1 | Other expenses/Previous | venj-bw2-i:ExpensesOther | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r19.c0 | Result from ordinary activities before tax/Current | venj-bw2-i:ResultBeforeTaxOrdinaryActivities | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r19.c1 | Result from ordinary activities before tax/Previous | venj-bw2-i:ResultBeforeTaxOrdinaryActivities | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r20.c0 | Income tax expense from ordinary activities/Current | venj-bw2-i:IncomeTaxExpenseOrdinaryActivities | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r20.c1 | Income tax expense from ordinary activities/Previous | venj-bw2-i:IncomeTaxExpenseOrdinaryActivities | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r21.c0 | Result from ordinary activities after tax/Current | venj-bw2-i:ResultAfterTaxOrdinaryActivities | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r21.c1 | Result from ordinary activities after tax/Previous | venj-bw2-i:ResultAfterTaxOrdinaryActivities | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r22.c0 | Extraordinary expenses/Current | venj-bw2-i:ExtraordinaryExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r22.c1 | Extraordinary expenses/Previous | venj-bw2-i:ExtraordinaryExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r23.c0 | Extraordinary income/Current | venj-bw2-i:ExtraordinaryIncome | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r23.c1 | Extraordinary income/Previous | venj-bw2-i:ExtraordinaryIncome | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r24.c0 | Income tax expense from extraordinary items/Current | venj-bw2-i:IncomeTaxExpenseExtraordinaryItems | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r24.c1 | Income tax expense from extraordinary items/Previous | venj-bw2-i:IncomeTaxExpenseExtraordinaryItems | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r25.c0 | Result from extraordinary items after tax/Current | venj-bw2-i:ResultAfterTaxExtraordinaryItems | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r25.c1 | Result from extraordinary items after tax/Previous | venj-bw2-i:ResultAfterTaxExtraordinaryItems | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r26.c0 | Result after tax/Current | venj-bw2-i:ResultAfterTax | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |
| r26.c1 | Result after tax/Previous | venj-bw2-i:ResultAfterTax | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodPreviousStartDateParam/$FinancialReportingPeriodPreviousEndDateParam | venj-bw2-dm:NonTechnicalAccountMember | $BasisOfPreparationParam | venj-bw2-dm:SeparateMember |