| r0.c0 | HBO [member]/Current | ocw-dm:HBOMember | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r1.c0 | MBO [member]/Current | ocw-dm:MBOMember | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r2.c0 | VO [member]/Current | ocw-dm:VOMember | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r3.c0 | PO [member]/Current | ocw-dm:POMember | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r4.c0 | Other government funded activities [member]/Current | ocw-dm:OtherGovernmentFundedActivitiesMember | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r5.c0 | Segment reporting, total [member]/Current | ocw-dm:SegmentReportingTotalMember | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r6.c0 | Segment information, classes [title]/Current | ocw-abstr:SegmentReportingClassesTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r7.c0 | Intangible assets/Current | venj-bw2-i:IntangibleAssets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r8.c0 | Property, plant and equipment/Current | venj-bw2-i:PropertyPlantEquipment | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r9.c0 | Financial assets/Current | venj-bw2-i:FinancialAssets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r10.c0 | Non-current assets/Current | venj-bw2-i:AssetsNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r11.c0 | Non-current assets [title]/Current | venj-bw2-abstr:BW2AssetsNoncurrentTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r12.c0 | Inventories/Current | venj-bw2-i:Inventories | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r13.c0 | Receivables/Current | venj-bw2-i:Receivables | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r14.c0 | Current securities/Current | venj-bw2-i:SecuritiesCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r15.c0 | Cash and cash equivalents/Current | venj-bw2-i:CashAndCashEquivalents | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r16.c0 | Current assets/Current | venj-bw2-i:AssetsCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r17.c0 | Current assets [title]/Current | venj-bw2-abstr:BW2AssetsCurrentTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r18.c0 | Assets/Current | venj-bw2-i:Assets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r19.c0 | Assets [title]/Current | venj-bw2-abstr:BW2AssetsTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r20.c0 | Equity/Current | venj-bw2-i:Equity | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r21.c0 | Provisions/Current | venj-bw2-i:Provisions | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r22.c0 | Non-current liabilities/Current | venj-bw2-i:LiabilitiesNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r23.c0 | Current liabilities/Current | venj-bw2-i:LiabilitiesCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r24.c0 | Equity and liabilities/Current | venj-bw2-i:EquityAndLiabilities | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r25.c0 | Equity and liabilities [title]/Current | venj-bw2-abstr:BW2EquityAndLiabilitiesTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r26.c0 | Segment reporting, balance, line items [title]/Current | ocw-abstr:BalanceSegmentReportingLineItemsTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |