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Other Disclosures - Commitments (Details) kr in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 DKK (kr) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 DKK (kr) | Dec. 31, 2021 USD ($)
Commitments |  |  |  |
Short term contractual obligations | kr 1,687 |  | kr 1,340 |
Maximum due term of obligations | 2 years |  |  |
Contingent commitments | kr 20,077 | $ 2,880 | kr 19,574 | $ 2,983

X
- Definition na + References No definition available. + Details
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Namespace Prefix: | gmab_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The contingent commitments relates to license and collaboration agreements. + References No definition available. + Details
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Namespace Prefix: | gmab_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum due term of obligations. + References No definition available. + Details
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Namespace Prefix: | gmab_
Data Type: | xbrli:durationItemType
Balance Type: | na
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X
- Definition The amount of short term contractual obligations primarily related to research and development activities. + References No definition available. + Details
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Namespace Prefix: | gmab_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant