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Operating Assets and Liabilities - Future minimum payments under our leases (Details) - DKK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of maturity analysis of operating lease payments [abstract] |  |  |
Future minimum payments under our leases | kr 487 | kr 394 | kr 216
Cash outflow for leases | 70 | 53 | 38
Office and laboratory space | DENMARK |  |  |
Disclosure of maturity analysis of operating lease payments [abstract] |  |  |
Future minimum payments under our leases |  | 337 |
Estimated capital expenditures to fit out the space |  | 40 |
Office and laboratory space | UNITED STATES |  |  |
Disclosure of maturity analysis of operating lease payments [abstract] |  |  |
Future minimum payments under our leases |  |  | 113
Estimated capital expenditures to fit out the space |  |  | 74
Office and laboratory space | NETHERLANDS |  |  |
Disclosure of maturity analysis of operating lease payments [abstract] |  |  |
Future minimum payments under our leases |  |  | 119
Estimated capital expenditures to fit out the space |  |  | 23
Not later than one year [member] |  |  |
Disclosure of maturity analysis of operating lease payments [abstract] |  |  |
Future minimum payments under our leases | 74 | 53 | 32
1 to 3 years |  |  |
Disclosure of maturity analysis of operating lease payments [abstract] |  |  |
Future minimum payments under our leases | 109 | 85 | 64
More than 3 years but less than 5 years |  |  |
Disclosure of maturity analysis of operating lease payments [abstract] |  |  |
Future minimum payments under our leases | 97 | 62 | 27
Later than five years [member] |  |  |
Disclosure of maturity analysis of operating lease payments [abstract] |  |  |
Future minimum payments under our leases | kr 207 | kr 194 | kr 93

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_g&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_97&doctype=Standard -URIDate 2021-03-24 + Details
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