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Share-Based Instruments - Part 2 (Details) - DKK (kr) kr / shares in Units, kr in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Granted | 147,568 | 49,323
Exercised | 74,992 | 272,078
Weighted average exercise price of warrants granted | kr 2,189.21 | kr 1,548.22
Weighted average exercise price of fair market value | 683.79 | 465.70
Weighted average exercise price of warrants exercised | kr 606.22 | kr 261.06
Exercise of warrants | kr 46 | kr 54
Percentage of share capital attributed to exercise of warrants | 0.11% | 0.42%
Share-based compensation expenses | kr 142 | kr 98
Warrants [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Exercise of warrants | kr 46 | kr 71

X
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Balance Type: | na
Period Type: | duration

X
- Definition The number of warrants granted during period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Percentage of share capital attributed by exercise of warrants which increase the share capital. + References No definition available. + Details
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Namespace Prefix: | gmab_
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Balance Type: | na
Period Type: | duration

X
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- Definition Exercise price per share or per unit of fair value of warrants during the period. + References No definition available. + Details
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Namespace Prefix: | gmab_
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Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants exercised during the period. + References No definition available. + Details
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Namespace Prefix: | gmab_
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- Definition Exercise price per share or per unit of warrants granted during the period. + References No definition available. + Details
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Namespace Prefix: | gmab_
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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
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- Definition The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_51_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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Namespace Prefix: |
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