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 |
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 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||
| Statement of changes in equity [line items] | ||||||||||
| Increase (decrease) through acquisition of subsidiary, equity |
1 919
SEK
|
4 042
SEK
|
5 961
SEK
|
4 042
SEK
|
1,000,000
SEK
|
2,000,000
SEK
|
1,000,000
SEK
|
1,000,000
SEK
|
— | — |
| Increase (decrease) through disposal of subsidiary, equity | — | — | — | — | — |
57,000,000
SEK
|
57,000,000
SEK
|
— |
27,000,000
SEK
|
27,000,000
SEK
|