Statement Of Financial Position [Abstract]
| Concept |
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 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-01-01 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment |
52,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
42,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Investment property |
4 309,2
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
3 994,1
SEK
|
— | — | — | — | — | — | — | — |
| Intangible assets other than goodwill |
1,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
1,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Other non-current financial assets |
13,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
8,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Non-current assets |
4 420,3
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
3 999,8
SEK
|
— | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||
| Cash and cash equivalents |
2,379,000,000
SEK
|
— | — | — | — | — | — | — |
1,902,000,000
SEK
|
— | — | — |
1,902,000,000
SEK
|
— | — |
4,480,000,000
SEK
|
— | — | — | — | — |
| Current assets |
2,636,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
2,234,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Assets |
4 684,0
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
4 223,1
SEK
|
— | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital |
5,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
5,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Retained earnings |
6,917,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
4,835,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Equity |
2 501,1
SEK
|
6,917,000,000
SEK
|
220,000,000
SEK
|
5,000,000
SEK
|
1 786,9
SEK
|
50,000,000
SEK
|
4,835,000,000
SEK
|
5,000,000
SEK
|
2 275,9
SEK
|
1 786,9
SEK
|
4,835,000,000
SEK
|
1 786,9
SEK
|
2 275,9
SEK
|
50,000,000
SEK
|
5,000,000
SEK
|
— |
2,738,000,000
SEK
|
1 786,9
SEK
|
5,000,000
SEK
|
33,000,000
SEK
|
2 057,9
SEK
|
| Liabilities [abstract] | |||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||
| Deferred tax liabilities |
1,956,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
1,391,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Non-current liabilities |
1 866,5
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
1 865,9
SEK
|
— | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||
| Trade and other current payables |
221,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
119,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Current tax liabilities, current |
18,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
40,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Other current financial liabilities |
585,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
636,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Current liabilities |
3,164,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
813,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Liabilities |
2 182,9
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
1 947,2
SEK
|
— | — | — | — | — | — | — | — |
| Equity and liabilities |
4 684,0
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
4 223,1
SEK
|
— | — | — | — | — | — | — | — |