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Capital Structure, Financial Risk and Related Items - Financial Risk (Details) - DKK (kr)
kr in Millions
12 Months Ended
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%