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 |
|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||
| Statement of changes in equity [line items] | ||||||||
| Dividends recognised as distributions to owners of parent, relating to current year |
8,000,000
SEK
|
— | — |
177,000,000
SEK
|
185,000,000
SEK
|
— | — | — |
| Increase (decrease) through acquisition of subsidiary, equity | — | — | — |
143,000,000
SEK
|
143,000,000
SEK
|
— | — | — |
| Increase (decrease) through transactions with owners, equity |
8,000,000
SEK
|
41,000,000
SEK
|
283,000,000
SEK
|
290,000,000
SEK
|
42,000,000
SEK
|
3,000,000
SEK
|
339,000,000
SEK
|
336,000,000
SEK
|
| Share issue related cost | — | — |
1,000,000
SEK
|
1,000,000
SEK
|
— | — |
11,000,000
SEK
|
11,000,000
SEK
|