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Capital structure and financial items - Financial risks - Narrative (Details) - DKK (kr)
kr in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Top of range    
Disclosure of detailed information about hedges [line items]    
Period to cover expected future cash flow 24 months  
USD, CNY, JPY, GBP, and CAD | Top of range    
Disclosure of detailed information about hedges [line items]    
Period to cover expected future cash flow 13 months  
USD, CNY, JPY, GBP, and CAD | Bottom of range    
Disclosure of detailed information about hedges [line items]    
Period to cover expected future cash flow 5 months  
USD    
Disclosure of detailed information about hedges [line items]    
Period to cover expected future cash flow 10 months 9 months
Foreign exchange risk    
Disclosure of detailed information about hedges [line items]    
Percent increase/decrease that would impact results 5.00%  
Financial counterparties | Credit risk    
Disclosure of detailed information about hedges [line items]    
Maximum exposure to credit risk kr 15,089 kr 15,663
Trade receivables, Other receivables less prepayments and VAT and Other financial assets | Credit risk    
Disclosure of detailed information about hedges [line items]    
Maximum exposure to credit risk 29,522 26,622
5% increase in all other currencies | Foreign exchange risk    
Disclosure of detailed information about hedges [line items]    
Impact on income statement 299 199
5% increase in all other currencies | Foreign exchange risk | USD    
Disclosure of detailed information about hedges [line items]    
Impact on equity 1,380 1,298
Impact on income statement kr (2) kr 135