Statement Of Changes In Equity [Abstract]
| Concept |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 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 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||
| Equity |
604,000,000
SEK
|
449,000,000
SEK
|
— |
1,138,000,000
SEK
|
— | — |
1,138,000,000
SEK
|
— |
15,000,000
SEK
|
71,000,000
SEK
|
— | — | — | — |
556,000,000
SEK
|
449,000,000
SEK
|
1,088,000,000
SEK
|
71,000,000
SEK
|
— |
12,000,000
SEK
|
— | — |
1,088,000,000
SEK
|
— | — | — |
1,117,000,000
SEK
|
16,000,000
SEK
|
449,000,000
SEK
|
581,000,000
SEK
|
71,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
329,000,000
SEK
|
— | — |
-
SEK
|
— |
-
SEK
|
— | — |
-
SEK
|
329,000,000
SEK
|
329,000,000
SEK
|
222,000,000
SEK
|
— | — | — | — |
223,000,000
SEK
|
— |
-
SEK
|
-
SEK
|
— |
-
SEK
|
— |
223,000,000
SEK
|
— | — | — | — | — |
| Other comprehensive income | — | — |
2,000,000
SEK
|
— | — |
2,000,000
SEK
|
— |
-
SEK
|
— | — |
-
SEK
|
2,000,000
SEK
|
-
SEK
|
4,000,000
SEK
|
— | — | — | — |
-
SEK
|
— |
-
SEK
|
-
SEK
|
— |
4,000,000
SEK
|
— |
4,000,000
SEK
|
— | — | — | — | — |
| Comprehensive income | — | — |
332,000,000
SEK
|
— | — |
2,000,000
SEK
|
— |
-
SEK
|
— | — |
-
SEK
|
332,000,000
SEK
|
329,000,000
SEK
|
219,000,000
SEK
|
— | — | — | — |
223,000,000
SEK
|
— | — |
-
SEK
|
— |
4,000,000
SEK
|
-
SEK
|
219,000,000
SEK
|
— | — | — | — | — |
| Dividends recognised as distributions to owners | — | — |
284,000,000
SEK
|
— | — |
-
SEK
|
— |
-
SEK
|
— | — |
-
SEK
|
— |
284,000,000
SEK
|
— | — | — | — | — |
248,000,000
SEK
|
— |
-
SEK
|
-
SEK
|
— |
-
SEK
|
— |
248,000,000
SEK
|
— | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — |
2,000,000
SEK
|
— |
-
SEK
|
-
SEK
|
— |
-
SEK
|
— | — | — | — |
2,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |