XML 218 R38.htm IDEA: XBRL DOCUMENT
v3.22.4

Capital Structure, Financial Risk and Related Items - Financial Risk (Details) - DKK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of credit risk exposure [line items] |  |  |
Percentage of marketable securities | 100.00% | 100.00% |
DKK |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of possible increase or decrease in exchange rate | 10.00% | 10.00% |
Credit risk |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Maximum credit exposure | kr 22,324 | kr 19,338 |
Maximum credit exposure to receivables | 5,958 | 3,394 |
Total value of bank deposits | kr 9,893 | kr 8,957 |
Credit risk | Triple A-rating from Moody's, S&P or Fitch |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of marketable securities | 75.00% | 68.00% |
Marketable securities including interest receivables | kr 12,431 | kr 10,381 |
Currency risk |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue (as a percent) | 89.00% | 92.00% | 95.00%
Marketable securities were invested (as a percent) | 100.00% | 100.00% |
Currency risk | United States of America, Dollars |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Marketable securities were invested (as a percent) | 80.00% | 75.00% |
Currency risk | DKK |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Marketable securities were invested (as a percent) | 12.00% | 16.00% |
Currency risk | Euro Member Countries, Euro |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Marketable securities were invested (as a percent) | 7.00% | 8.00% |
Currency risk | United Kingdom, Pounds |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Marketable securities were invested (as a percent) | 1.00% | 1.00% |

X
- Definition The value of bank deposits including short-term marketable securities. + References No definition available. + Details
Name: | gmab_BankDepositsIncludingShortTermMarketableSecurities
Namespace Prefix: | gmab_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of marketable securities including interest receivable. + References No definition available. + Details
Name: | gmab_MarketableSecuritiesIncludingInterestReceivables
Namespace Prefix: | gmab_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of marketable securities. + References No definition available. + Details
Name: | gmab_PercentageOfMarketableSecurities
Namespace Prefix: | gmab_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of marketable securities invested. + References No definition available. + Details
Name: | gmab_PercentageOfMarketableSecuritiesInvested
Namespace Prefix: | gmab_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of possible increase or decrease in exchange rate. + References No definition available. + Details
Name: | gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate
Namespace Prefix: | gmab_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of revenue. + References No definition available. + Details
Name: | gmab_PercentageOfRevenue
Namespace Prefix: | gmab_
Data Type: | dtr-types:percentItemType
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 members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfCreditRiskExposureLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 36 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2022-03-24 + Details
Name: | ifrs-full_MaximumExposureToCreditRisk
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum exposure to the credit risk of loans or receivables. [Refer: Loans and receivables; Credit risk [member]; Maximum exposure to credit risk] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 9 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_9_a&doctype=Standard&book=b -URIDate 2022-03-24 + Details
Name: | ifrs-full_MaximumExposureToCreditRiskOfLoansOrReceivables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_CurrencyAxis=currency_DKK
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ExternalCreditGradesAxis=gmab_TripleaRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_GBP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |