Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||
| Assets [abstract] | ||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||
| Property, plant and equipment | — | — | — | — |
62,000,000
SEK
|
52,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Investment property | — | — | — | — |
4 412,7
SEK
|
4 309,2
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — | — |
2,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Other non-current financial assets | — | — | — | — |
14,000,000
SEK
|
13,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — |
4 453,9
SEK
|
4 420,3
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||
| Cash and cash equivalents | — | — | — | — |
1,194,000,000
SEK
|
2,379,000,000
SEK
|
— | — | — | — | — |
1,902,000,000
SEK
|
— | — | — | — |
| Current assets | — | — | — | — |
1,568,000,000
SEK
|
2,636,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — |
4 610,7
SEK
|
4 684,0
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||
| Equity [abstract] | ||||||||||||||||
| Issued capital | — | — | — | — |
5,000,000
SEK
|
5,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — |
4,916,000,000
SEK
|
6,917,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Equity |
233,000,000
SEK
|
5,000,000
SEK
|
4,916,000,000
SEK
|
1 786,9
SEK
|
23,023,000,000
SEK
|
2 501,1
SEK
|
220,000,000
SEK
|
5,000,000
SEK
|
6,917,000,000
SEK
|
220,000,000
SEK
|
1 786,9
SEK
|
2 275,9
SEK
|
4,835,000,000
SEK
|
1 786,9
SEK
|
50,000,000
SEK
|
5,000,000
SEK
|
| Liabilities [abstract] | ||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||
| Deferred tax liabilities | — | — | — | — |
1,576,000,000
SEK
|
1,956,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — |
2 084,9
SEK
|
1 866,5
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||
| Trade and other current payables | — | — | — | — |
104,000,000
SEK
|
194,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, current | — | — | — | — |
6,000,000
SEK
|
18,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Other current financial liabilities | — | — | — | — |
812,000,000
SEK
|
585,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — |
2,235,000,000
SEK
|
3,164,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — |
2 308,4
SEK
|
2 182,9
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — | — |
2 302,3
SEK
|
2 501,1
SEK
|
— | — | — | — | — | — | — | — | — | — |