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 |
|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||
| Statement of changes in equity [line items] | |||||||
| Increase (decrease) through transactions with owners, equity |
0
SEK
|
0
SEK
|
0
SEK
|
— |
32,000,000
SEK
|
4,983,000,000
SEK
|
4,951,000,000
SEK
|
| Purchase of treasury shares | — | — |
243,000,000
SEK
|
243,000,000
SEK
|
— | — | — |
| Share issue related cost | — | — | — | — | — | — |
57,000,000
SEK
|