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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%