Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||
| Statement of changes in equity [line items] | ||||||||||
| Increase (decrease) through appropriation of retained earnings, equity | — | — | — | — | — |
485,000,000
SEK
|
485,000,000
SEK
|
— | — | — |
| Increase (decrease) through transactions with owners, equity |
1,000,000
SEK
|
1,000,000
SEK
|
674,000,000
SEK
|
675,000,000
SEK
|
675,000,000
SEK
|
398,000,000
SEK
|
485,000,000
SEK
|
84,000,000
SEK
|
3,000,000
SEK
|
87,000,000
SEK
|