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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||
| Assets [abstract] | ||||||||||||
| Property, plant and equipment | — | — | — |
34 954,5
SEK
|
36 921,8
SEK
|
— | — | — | — | — | — | — |
| Right-of-use assets | — | — | — |
1 200,0
SEK
|
1 190,0
SEK
|
— | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
960,000,000
SEK
|
1,820,000,000
SEK
|
— | — | — |
2,107,000,000
SEK
|
— | — | — |
| Assets | — | — | — |
36 027,4
SEK
|
38 124,0
SEK
|
— | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||
| Equity [abstract] | ||||||||||||
| Issued capital | — | — | — |
6,596,000,000
SEK
|
6,596,000,000
SEK
|
— | — | — | — | — | — | — |
| Retained earnings | — | — | — |
11 907,0
SEK
|
13 691,1
SEK
|
— | — | — | — | — | — | — |
| Equity attributable to owners of parent |
6,596,000,000
SEK
|
2 051,4
SEK
|
11 907,0
SEK
|
14 618,0
SEK
|
— | — | — | — | — | — | — | — |
| Equity |
6,596,000,000
SEK
|
2 051,4
SEK
|
11 907,0
SEK
|
14 618,0
SEK
|
16 402,1
SEK
|
13 691,1
SEK
|
6,596,000,000
SEK
|
2 051,4
SEK
|
17 457,4
SEK
|
14 186,8
SEK
|
2 592,0
SEK
|
6,786,000,000
SEK
|
| Liabilities [abstract] | ||||||||||||
| Deferred tax liabilities | — | — | — |
2 793,6
SEK
|
3 172,3
SEK
|
— | — | — | — | — | — | — |
| Liabilities | — | — | — |
21 409,4
SEK
|
21 721,9
SEK
|
— | — | — | — | — | — | — |
| Equity and liabilities | — | — | — |
36 027,4
SEK
|
38 124,0
SEK
|
— | — | — | — | — | — | — |