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 |
|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||
| Statement of changes in equity [line items] | ||||||
| Dividends recognised as distributions to owners of parent | — | — |
7,809,000,000
SEK
|
7,809,000,000
SEK
|
— | — |
| Increase (decrease) through acquisition of subsidiary, equity | — | — | — | — |
105,000,000
SEK
|
105,000,000
SEK
|
| Increase (decrease) through transactions with owners, equity |
3,000,000
SEK
|
206,000,000
SEK
|
7,719,000,000
SEK
|
7,928,000,000
SEK
|
105,000,000
SEK
|
105,000,000
SEK
|