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CAPITAL STRUCTURE, FINANCIAL RISK AND RELATED ITEMS - Financial Risk (Details) - DKK (kr)
kr in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]      
Percentage of marketable securities 100.00% 100.00%  
EUR      
Disclosure of credit risk exposure [line items]      
Percentage of possible increase or decrease in exchange rate 1.00% 1.00%  
USD      
Disclosure of credit risk exposure [line items]      
Percentage of possible increase or decrease in exchange rate 10.00% 10.00%  
GBP      
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 10,971 kr 6,106  
Maximum credit exposure to receivables 3,001 1,337  
Total value of bank deposits kr 3,552 kr 533  
Credit risk | Triple A-rating from Moody’s, S&P or Fitch      
Disclosure of credit risk exposure [line items]      
Percentage of marketable securities 91.00% 90.00%  
Marketable securities including interest receivables kr 7,453 kr 5,591  
Currency risk      
Disclosure of credit risk exposure [line items]      
Revenue (as a percent) 97.00% 96.00% 96.00%
Currency risk | EUR      
Disclosure of credit risk exposure [line items]      
Marketable securities were invested (as a percent) 12.00% 16.00%  
Currency risk | DKK      
Disclosure of credit risk exposure [line items]      
Marketable securities were invested (as a percent) 23.00% 30.00%  
Currency risk | USD      
Disclosure of credit risk exposure [line items]      
Marketable securities were invested (as a percent) 64.00% 53.00%  
Currency risk | GBP      
Disclosure of credit risk exposure [line items]      
Marketable securities were invested (as a percent) 1.00% 1.00%