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Related Parties (Details) - Key Changes to Executive Management	Apr. 13, 2021 item
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

X

- Definition

Number of employee elected board members.

+ References

No definition available.

+ Details

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Namespace Prefix:	gmab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of independent board members.

+ References

No definition available.

+ Details

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Namespace Prefix:	gmab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_KeyManagementPersonnelOfEntityOrParentMember
Namespace Prefix:
Data Type:	na
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