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Results for the year - Segment information - Narrative (Details)
kr in Millions
12 Months Ended
Dec. 31, 2020
DKK (kr)
wholesaler
segment
commercial_unit
Dec. 31, 2019
DKK (kr)
Dec. 31, 2018
Disclosure of geographical areas [line items]      
Number of major wholesalers distributing products | wholesaler 3    
Net sales expected to be recognised in next 12 months kr 431 kr 544  
Net sales expected to be recognised thereafter kr 216 32  
Number of business segments | segment 2    
Number of main commercial units | commercial_unit 2    
Property, plant and equipment kr 50,269 50,551  
Outside of Denmark      
Disclosure of geographical areas [line items]      
Total sales (as a percent) (more than for USA) 99.70%    
USA and China      
Disclosure of geographical areas [line items]      
Total sales (as a percent) (more than for USA) 10.00%    
Denmark      
Disclosure of geographical areas [line items]      
Property, plant and equipment kr 44,431 28,322  
USA      
Disclosure of geographical areas [line items]      
Property, plant and equipment kr 18,750 kr 20,256  
Wholesaler 1      
Disclosure of geographical areas [line items]      
Total sales (as a percent) (more than for USA) 19.00% 19.00% 20.00%
Wholesaler 2      
Disclosure of geographical areas [line items]      
Total sales (as a percent) (more than for USA) 13.00% 14.00% 13.00%
Wholesaler 3      
Disclosure of geographical areas [line items]      
Total sales (as a percent) (more than for USA) 12.00% 12.00% 13.00%