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Capital Structure, Financial Risk and Related Items - Financial Risk (Details) - DKK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of credit risk exposure [line items] |  |  |
Percentage of marketable securities | 100.00% | 100.00% |
United States of America, Dollars |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of possible increase or decrease in exchange rate | 10.00% | 10.00% |
DKK |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of possible increase or decrease in exchange rate | 10.00% | 10.00% |
Euro Member Countries, Euro |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of possible increase or decrease in exchange rate | 1.00% | 1.00% |
United Kingdom, Pounds |  |  |
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 19,338 | kr 16,079 |
Maximum credit exposure to receivables | 3,394 | 2,483 |
Total value of bank deposits | kr 8,957 | kr 7,260 |
Credit risk | Triple A-rating from Moody's, S&P or Fitch |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of marketable securities | 68.00% | 100.00% |
Marketable securities including interest receivables | kr 10,418 | kr 8,874 |
Currency risk [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue (as a percent) | 92.00% | 95.00% | 97.00%
Marketable securities were invested (as a percent) | 100.00% | 100.00% |
Currency risk [member] | United States of America, Dollars |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Marketable securities were invested (as a percent) | 75.00% | 70.00% |
Currency risk [member] | DKK |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Marketable securities were invested (as a percent) | 16.00% | 19.00% |
Currency risk [member] | Euro Member Countries, Euro |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Marketable securities were invested (as a percent) | 8.00% | 10.00% |
Currency risk [member] | United Kingdom, Pounds |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Marketable securities were invested (as a percent) | 1.00% | 1.00% |

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