Statement Of Financial Position [Abstract]
| Concept |
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 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Property, plant and equipment |
18,000,000
SEK
|
— | — | — | — |
21,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
697,000,000
SEK
|
— | — | — | — |
0
SEK
|
— | — | — | — | — |
56,000,000
SEK
|
— | — | — |
| Assets |
150,752,000,000
SEK
|
— | — | — | — |
129,110,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital |
1,088,000,000
SEK
|
— | — | — | — |
1,088,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Equity |
143,079,000,000
SEK
|
1,063,000,000
SEK
|
1,088,000,000
SEK
|
26,594,000,000
SEK
|
114,334,000,000
SEK
|
120,976,000,000
SEK
|
1,088,000,000
SEK
|
1,063,000,000
SEK
|
110,385,000,000
SEK
|
8,440,000,000
SEK
|
1,088,000,000
SEK
|
112,528,000,000
SEK
|
1,063,000,000
SEK
|
29,837,000,000
SEK
|
80,540,000,000
SEK
|
| Liabilities [abstract] | |||||||||||||||
| Deferred tax liabilities |
164,000,000
SEK
|
— | — | — | — |
140,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities |
150,752,000,000
SEK
|
— | — | — | — |
129,110,000,000
SEK
|
— | — | — | — | — | — | — | — | — |