Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 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 changes in equity [abstract] | ||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||
| Equity | — |
194,000,000
SEK
|
1,000,000
SEK
|
808,000,000
SEK
|
— |
1 049
SEK
|
— |
48,000,000
SEK
|
— | — | — | — |
65,000,000
SEK
|
525,000,000
SEK
|
7,000,000
SEK
|
— |
3,000,000
SEK
|
— | — |
470,000,000
SEK
|
— |
5,000,000
SEK
|
189,000,000
SEK
|
131,000,000
SEK
|
67,000,000
SEK
|
4,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||
| Profit (loss) |
8,000,000
SEK
|
— | — | — | — | — | — | — | — |
293,000,000
SEK
|
301,000,000
SEK
|
2,000,000
SEK
|
— | — | — |
2,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
8,000,000
SEK
|
— | — | — |
4,000,000
SEK
|
— | — | — | — |
289,000,000
SEK
|
301,000,000
SEK
|
0
SEK
|
— | — | — |
2,000,000
SEK
|
— |
2,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — |
41,000,000
SEK
|
— |
276,000,000
SEK
|
317,000,000
SEK
|
— |
350,000,000
SEK
|
— | — | — | — | — | — |
347,000,000
SEK
|
— |
3,000,000
SEK
|
— | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — | — | — | — | — | — |
8,000,000
SEK
|
8,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |