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Other Disclosures - Company Overview (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Genmab B.V.
Company Overview
Ownership and votes (Percentage)	100.00%	100.00%
Genmab Holding B.V.
Company Overview
Ownership and votes (Percentage)	100.00%	100.00%
Genmab US, Inc.
Company Overview
Ownership and votes (Percentage)	100.00%	100.00%
Genmab K.K.
Company Overview
Ownership and votes (Percentage)	100.00%	100.00%

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- Definition

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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