| r0.c0 | Group companies, specification total/Current receivables from group companies | jenv-bw2-i:ReceivablesGroupCompaniesCurrent | nl-types:monetaryNoDecimals20ItemType | instant | jenv-bw2-dm:ConsolidatedMember | ocw-dm:ActualsMember | ocw-dm:AssetsCurrentSpecificationComponentMember | * | N/A |
| r0.c1 | Group companies, specification total/Current receivables from group companies | jenv-bw2-i:ReceivablesGroupCompaniesCurrent | nl-types:monetaryNoDecimals20ItemType | instant | jenv-bw2-dm:ConsolidatedMember | ocw-dm:ActualsMember | ocw-dm:AssetsCurrentSpecificationComponentMember | * | N/A |
| r0.c2 | Group companies, specification total/Current | | | | N/A | N/A | N/A | * | xs:date('2020-12-31') |
| r0.c3 | Group companies, specification total/Previous | | | | N/A | N/A | N/A | * | xs:date('2019-12-31') |
| r1.c0 | ocw-table_NotesAssetsCurrentReceivablesGroupCompaniesSpecification-y/Current receivables from group companies | jenv-bw2-i:ReceivablesGroupCompaniesCurrent | nl-types:monetaryNoDecimals20ItemType | instant | jenv-bw2-dm:ConsolidatedMember | ocw-dm:ActualsMember | ocw-dm:AssetsCurrentSpecificationComponentMember | * | N/A |
| r1.c1 | ocw-table_NotesAssetsCurrentReceivablesGroupCompaniesSpecification-y/Current receivables from group companies | jenv-bw2-i:ReceivablesGroupCompaniesCurrent | nl-types:monetaryNoDecimals20ItemType | instant | jenv-bw2-dm:ConsolidatedMember | ocw-dm:ActualsMember | ocw-dm:AssetsCurrentSpecificationComponentMember | * | N/A |
| r1.c2 | ocw-table_NotesAssetsCurrentReceivablesGroupCompaniesSpecification-y/Current | | | | N/A | N/A | N/A | * | xs:date('2020-12-31') |
| r1.c3 | ocw-table_NotesAssetsCurrentReceivablesGroupCompaniesSpecification-y/Previous | | | | N/A | N/A | N/A | * | xs:date('2019-12-31') |