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Share-Based Instruments - Warrant Program (Details) - DKK (kr) kr / shares in Units, kr in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise of warrants	kr 34	kr 46
Share-based compensation expenses	kr 208	kr 142
Warrants [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Granted	230,112	147,568
Exercised	34,987	74,992
Weighted average exercise price of warrants granted	kr 2,178.40	kr 2,189.21
Weighted average exercise price of fair market value	629.05	683.79
Weighted average exercise price of warrants exercised	kr 983.98	kr 606.22
Percentage of share capital attributed to exercise of warrants	0.05%	0.11%

X

- Definition

The number of warrants exercised during period.

+ References

No definition available.

+ Details

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Namespace Prefix:	gmab_
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Balance Type:	na
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X

- Definition

The number of warrants granted during period.

+ References

No definition available.

+ Details

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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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X

- 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
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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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X

- Definition

Exercise price per share or per unit of warrants granted during the period.

+ References

No definition available.

+ Details

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X

- 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.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
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X

- 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 2021-01-01
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_51_a&doctype=Standard
-URIDate 2021-03-24

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Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow from the exercise of share purchase warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17&doctype=Standard
-URIDate 2021-03-24

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- Details

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