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Capital Structure, Financial Risk and Related Items - Changes in Share Capital (Details) kr / shares in Units, kr in Millions, $ in Millions |  |  | 12 Months Ended
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Jul. 23, 2019 DKK (kr) shares | Jul. 23, 2019 USD ($) shares | Jul. 22, 2019 DKK (kr) shares | Jul. 22, 2019 USD ($) shares | Dec. 31, 2021 DKK (kr) kr / shares shares | Dec. 31, 2020 DKK (kr) kr / shares shares | Dec. 31, 2019 DKK (kr) kr / shares shares
Share Capital |  |  |  |  |  |  |
Shares authorized |  |  |  |  | 65,718,456 |  |
Nominal amount | kr / shares |  |  |  |  | kr 1 |  |
Number of shares |  |  |  |  |  |  |
Number of shares, at beginning of period |  |  |  |  | 65,545,748 | 65,074,502 | 61,497,571
Shares issued (in shares) |  |  |  |  |  |  | 3,277,500
Exercise of warrants |  |  |  |  | 172,708 | 471,246 | 299,431
Number of shares, at end of period |  |  |  |  | 65,718,456 | 65,545,748 | 65,074,502
Share capital |  |  |  |  |  |  |
Share capital, at beginning of period | kr |  |  |  |  | kr 65.5 | kr 65.1 | kr 61.5
Shares issued for cash | kr |  |  |  |  |  |  | 3.3
Exercise of warrants | kr |  |  |  |  | 0.2 | 0.4 | 0.3
Share capital, at end of period | kr |  |  |  |  | kr 65.7 | kr 65.5 | kr 65.1
Proceeds from sale of shares | kr 3,873.0 | $ 582 |  |  |  |  |
Increase in share capital of ordinary shares |  |  | 2,850,000 | 2,850,000 |  |  |
Bottom of range [member] |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |
Exercise price warrants granted | kr / shares |  |  |  |  | kr 31.75 | kr 31.75 | kr 31.75
Top of range [member] |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |
Exercise price warrants granted | kr / shares |  |  |  |  | kr 1,432.00 | kr 1,432.00 | kr 1,424.00
American Depository Receipt [Member] |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |
Proceeds from sale of shares |  |  | kr 3,368.0 | $ 506 |  |  |
Increase in share capital of ordinary shares |  |  | 28,500,000 | 28,500,000 |  |  |
Underwriters option |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |
Increase in share capital of ordinary shares |  |  | 427,500 | 427,500 |  |  |
Underwriters option | American Depository Receipt [Member] |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |
Increase in share capital of ordinary shares | 3,277,500 | 3,277,500 | 4,275,000 | 4,275,000 |  |  |

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