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] | ||||||||||||||||
| 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
|
— | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — |
1,194,000,000
SEK
|
2,379,000,000
SEK
|
— | — | — | — | — |
1,902,000,000
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] | ||||||||||||||||
| Deferred tax liabilities | — | — | — | — |
1,576,000,000
SEK
|
1,956,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — |
2 308,4
SEK
|
2 182,9
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — | — |
2 302,3
SEK
|
2 501,1
SEK
|
— | — | — | — | — | — | — | — | — | — |