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Capital structure and financial items - Borrowings - Narrative (Details)
kr in Millions, € in Billions
12 Months Ended
Dec. 31, 2022
DKK (kr)
Dec. 31, 2021
DKK (kr)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
DKK (kr)
Disclosure of detailed information about borrowings [line items]          
Issued bonds, principal amount kr 25,784 kr 26,645     kr 10,356
Marketable securities transferred at carrying amount   5,937      
Liabilities associated to financial assets available-for-sale   5,937      
Financial liabilities, at fair value kr 2,903 kr 2,184      
Euro Medium Term Note          
Disclosure of detailed information about borrowings [line items]          
Number of tranches, issued bonds 3 2      
Issued bonds, principal amount kr 11,100 kr 9,700 € 1.5 € 1.3  
Financial liabilities, at fair value | €     € 18.7 € 9.6