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Capital Structure, Financial Risk and Related Items - Treasury Shares (Details) - DKK (kr) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share capital |  |  |  |
Share capital, at beginning of period | kr 65,700,000 | kr 65,500,000 | kr 65,100,000 |
Purchase of treasury shares | 908,000,000 | 447,000,000 |  |
Share capital, at end of period | 66,000,000.0 | kr 65,700,000 | kr 65,500,000 | kr 65,100,000
Cost |  |  |  |
Nominal value of shares repurchases | kr 500,000 |  |  |
Treasury shares held | 65,961,573 | 65,718,456 | 65,545,748 | 65,074,502
Treasury shares [member] |  |  |  |
Number of shares |  |  |  |
Number of shares at beginning of period | 288,325 | 132,106 | 163,921 |
Purchase of treasury shares. | 370,000 | 200,000 |  |
Shares used for funding RSU program | (68,377) | (43,781) | (31,815) |
Number of shares at end of period | 589,948 | 288,325 | 132,106 | 163,921
Share capital |  |  |  |
Share capital, at beginning of period | kr 300,000 | kr 100,000 | kr 200,000 |
Purchase of treasury shares | 400,000 | 200,000 |  |
Shares used for funding RSU program | (100,000) |  | (100,000) |
Share capital, at end of period | kr 600,000 | kr 300,000 | kr 100,000 | kr 200,000
Proportion of share capital |  |  |  |
Proportion of share capital, at beginning of period | 0.40% | 0.20% | 0.30% |
Proportion of share capital on purchase of treasury shares | 0.60% | 0.30% |  |
Proportion of share capital on shares used for funding RSU program | (0.10%) | (0.10%) | (0.10%) |
Proportion of share capital, at end of period | 0.90% | 0.40% | 0.20% | 0.30%
Cost |  |  |  |
Cost, at beginning of period | kr 550,000,000 | kr 154,000,000 | kr 192,000,000 |
Purchase of treasury shares | 908,000,000 | 447,000,000 |  |
Shares used for funding RSU program | (80,000,000) | (51,000,000) | (38,000,000) |
Cost at end of period | kr 1,378,000,000 | kr 550,000,000 | kr 154,000,000 | kr 192,000,000
Treasury shares held | 589,948 |  |  |
RSU |  |  |  |
Number of shares |  |  |  |
Purchase of treasury shares. | 370,000 | 200,000 |  |
Share capital |  |  |  |
Purchase of treasury shares | kr 908,000,000 | kr 447,000,000 |  |
Proportion of share capital |  |  |  |
Proportion of share capital on purchase of treasury shares |  | 0.60% | 0.30% |
First authorization |  |  |  |
Cost |  |  |  |
Number of shares authorized for repurchase |  | 500,000 |  |
Actual shares repurchased under authorization |  | 40,000 |  |
Shares available for repurchase |  | 460,000 |  |
Second authorization |  |  |  |
Cost |  |  |  |
Number of shares authorized for repurchase |  |  |  | 500,000
Actual shares repurchased under authorization |  |  |  | 500,000

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