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OPERATING ASSETS AND LIABILITIES - Accounting policies and management estimates (Details) - DKK (kr)
kr in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Research and development expenses kr 2,386 kr 1,431 kr 874
Carrying amount of intangible asset kr 470 470  
Actual useful life of intangibles 7 years    
Minimum      
Disclosure of detailed information about intangible assets [line items]      
Estimated useful life of intangibles 7 years    
Licences, Rights and Patents      
Disclosure of detailed information about intangible assets [line items]      
Carrying amount of intangible asset kr 470 kr 470  
Licences, Rights and Patents | Minimum      
Disclosure of detailed information about intangible assets [line items]      
Estimated useful life of intangibles 5 years    
Licences, Rights and Patents | Maximum      
Disclosure of detailed information about intangible assets [line items]      
Estimated useful life of intangibles 7 years