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Operating Assets and Liabilities - Deferred Revenue (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 10, 2020 | Jul. 31, 2020 DKK (kr) | Jul. 31, 2020 USD ($) | Dec. 31, 2021 DKK (kr) | Dec. 31, 2020 DKK (kr) | Dec. 31, 2019 DKK (kr)
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |  |
Revenue recognized during the year |  |  |  | kr (8,482,000,000) | kr (10,111,000,000) | kr (5,366,000,000)
Upfront payment recognized |  |  |  | 8,482,000,000 | 10,111,000,000 | kr 5,366,000,000
AbbVie |  |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |  |
Deferred revenue at January 1 |  |  |  | 513,000,000 |  |
Payment received |  |  |  |  | 4,911,000,000 |
Revenue recognized during the year |  |  |  | (245,000,000) | (4,398,000,000) |
Total at December 31 |  |  |  | 513,000,000 | 513,000,000 |
Non-current deferred revenue |  |  |  | 487,000,000 | 487,000,000 |
Current deferred revenue |  |  |  | 26,000,000 | 26,000,000 |
Deferred Revenue Recognized |  |  |  | 0 | 0 |
Total at December 31 |  |  |  | 513,000,000 | 513,000,000 |
Upfront payment |  | kr 4,911,000,000 | $ 750 |  |  |
Upfront payment recognized |  |  |  | 0 | 4,398,000,000 |
Revenue from performance obligations satisfied or partially satisfied in previous periods |  |  |  | kr 0 | kr 0 |
Performance Obligation Revenue Recognition Period | 7 years |  |  | 7 years |  |

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