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v3.21.2

Related Parties (Details) - Key Changes to Executive Management | Apr. 13, 2021 item
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Disclosure of transactions between related parties [line items] |
Number of independent board members | 5
Number of non independent board members | 1
Number of employee elected board members | 3

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- Definition Number of employee elected board members. + References No definition available. + Details
Name: | gmab_NumberOfEmployeeElectedBoardMembers
Namespace Prefix: | gmab_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of independent board members. + References No definition available. + Details
Name: | gmab_NumberOfIndependentBoardMembers
Namespace Prefix: | gmab_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of non independent board members. + References No definition available. + Details
Name: | gmab_NumberOfNonIndependentBoardMembers
Namespace Prefix: | gmab_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_KeyManagementPersonnelOfEntityOrParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |