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Operating Assets and Liabilities - Provisions (Details) - DKK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Operating Assets and Liabilities |  |
Provisions at beginning of period | kr 4 | kr 2
Additions during the year | 9 | 2
Provisions at end of period | 13 | 4
Non-current provisions | 13 | 4
Provisions at end of period | kr 13 | kr 4

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- Definition The amount of increase in provisions. + References No definition available. + Details
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Namespace Prefix: | gmab_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | gmab_
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Period Type: | duration

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- Definition The amount of non-current provisions, including provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_l&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of liabilities of uncertain timing or amount, including provisions for employee benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_l&doctype=Standard -URIDate 2021-03-24 + Details
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