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 2023-12-31 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
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 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||
| Investment property |
20 276
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
19 805
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements |
468,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
1 064
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
9,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
104,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Other non-current financial assets |
43,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
376,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
20 991
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
21 495
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||
| Trade and other current receivables |
118,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
76,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
183,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
204,000,000
SEK
|
204,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
269,000,000
SEK
|
| Current assets |
894,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
359,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Assets |
21 885
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
21 854
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Equity |
7 849
SEK
|
4 533
SEK
|
33,000,000
SEK
|
2 949
SEK
|
334,000,000
SEK
|
7 816
SEK
|
4 954
SEK
|
46,000,000
SEK
|
7 617
SEK
|
324,000,000
SEK
|
2 339
SEK
|
7 663
SEK
|
7 663
SEK
|
46,000,000
SEK
|
2 339
SEK
|
4 954
SEK
|
324,000,000
SEK
|
7 617
SEK
|
6 698
SEK
|
4 041
SEK
|
2 334
SEK
|
324,000,000
SEK
|
46,000,000
SEK
|
6 743
SEK
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||
| Deferred tax liabilities |
1 240
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
1 248
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
11 709
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
13 007
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||
| Other current non-financial liabilities |
370,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
261,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
2 328
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
1 185
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
21 885
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
21 854
SEK
|
— | — | — | — | — | — | — | — | — | — | — |