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Financial Instruments - Fair Value Measurement (Details) - Net Book value - DKK (kr)
kr in Millions
Jun. 30, 2022
Dec. 31, 2021
Marketable Securities    
Reconciliation of changes in fair value measurement, assets [abstract]    
Financial assets kr 11,799 kr 10,381
Marketable Securities | Level 1 of fair value hierarchy [member]    
Reconciliation of changes in fair value measurement, assets [abstract]    
Financial assets 11,799 10,381
Other    
Reconciliation of changes in fair value measurement, assets [abstract]    
Financial assets 201 371
Other | Level 1 of fair value hierarchy [member]    
Reconciliation of changes in fair value measurement, assets [abstract]    
Financial assets 150 344
Other | Level 3 of fair value hierarchy [member]    
Reconciliation of changes in fair value measurement, assets [abstract]    
Financial assets kr 51 kr 27