| r0.c0 | Disclosure of financial assets/Current | venj-bw2-i:FinancialAssetsDisclosure | nl-types:formattedExplanationItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r1.c0 | Disclosure of investments in group companies/Current | venj-bw2-i:InvestmentsInParticipatingInterestsInGroupCompaniesDisclosure | nl-types:formattedExplanationItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r2.c0 | Disclosure of other investments in participating interests/Current | venj-bw2-i:InvestmentsInParticipatingInterestsOtherDisclosure | nl-types:formattedExplanationItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r3.c0 | Disclosure of non-current receivables from group companies/Current | venj-bw2-i:ReceivablesGroupCompaniesNoncurrentDisclosure | nl-types:formattedExplanationItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r4.c0 | Disclosure of non-current receivables from other relates parties/Current | venj-bw2-i:ReceivablesOtherRelatedPartiesNoncurrentDisclosure | nl-types:formattedExplanationItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r5.c0 | Disclosure of receivables from OCW and EZ (non-current)/Current | ocw-i:ReceivablesOCWAndEZNoncurrentDisclosure | nl-types:string100000ItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r6.c0 | Disclosure of receivables from local government and common regulations (non-current)/Current | ocw-i:ReceivablesLocalGovernmentCommonRegulationsNoncurrentDisclosure | nl-types:string100000ItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r7.c0 | Disclosure of securities (non-current)/Current | ocw-i:SecuritiesNoncurrentDisclosure | nl-types:string100000ItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r8.c0 | Disclosure of shares (non-current)/Current | ocw-i:SharesNoncurrentDisclosure | nl-types:string100000ItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r9.c0 | Disclosure of Dutch government bonds (non-current)/Current | ocw-i:DutchGovernmentBondsNoncurrentDisclosure | nl-types:string100000ItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r10.c0 | Disclosure of other bonds (non-current)/Current | ocw-i:OtherBondsNoncurrentDisclosure | nl-types:string100000ItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r11.c0 | Disclosure of other securities (non-current)/Current | ocw-i:OtherSecuritiesNoncurrentDisclosure | nl-types:string100000ItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r12.c0 | Disclosure of securities (non-current) [title]/Current | ocw-abstr:SecuritiesNoncurrentDisclosureTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r13.c0 | Disclosure of non-current other receivables/Current | venj-bw2-i:ReceivablesOtherNoncurrentDisclosure | nl-types:formattedExplanationItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |