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Operating Assets and Liabilities - Accounting policies and management estimates (Details) - DKK (kr)
kr in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]      
Research and development expenses kr 4,181 kr 3,137 kr 2,386
Carrying amount of intangible asset kr 254 338  
Actual useful life of intangibles 7 years    
Licenses, Rights and Patents      
Disclosure of detailed information about intangible assets [line items]      
Carrying amount of intangible asset kr 254 kr 338  
Licenses, Rights and Patents | Bottom of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Estimated useful life of intangibles 5 years    
Licenses, Rights and Patents | Top of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Estimated useful life of intangibles 7 years