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Capital structure and financial items - Issued bonds (Details) - DKK (kr)
kr in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]      
Notional amount kr 89,653 kr 63,390  
Issued bonds 26,645 kr 10,356 kr 4,483
Issued bonds maturing July 2024      
Disclosure of detailed information about borrowings [line items]      
Notional amount kr 650    
Coupon interest rate (in percentage) 0.00%    
Issued bonds kr 4,854    
Issued bonds maturing July 2024 | Fair value      
Disclosure of detailed information about borrowings [line items]      
Issued bonds 4,850    
Issued bonds maturing 2028      
Disclosure of detailed information about borrowings [line items]      
Notional amount kr 650    
Coupon interest rate (in percentage) 0.125%    
Issued bonds kr 4,800    
Issued bonds maturing 2028 | Fair value      
Disclosure of detailed information about borrowings [line items]      
Issued bonds kr 4,794