Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
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 |
As at 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 |
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 |
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 |
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 | — |
6 051
SEK
|
5 885
SEK
|
— |
94,000,000
SEK
|
— |
81,000,000
SEK
|
13,000,000
SEK
|
— |
300,000,000
SEK
|
547,000,000
SEK
|
— | — | — | — |
5 932
SEK
|
10,000,000
SEK
|
5 885
SEK
|
195,000,000
SEK
|
547,000,000
SEK
|
— |
305,000,000
SEK
|
— | — |
205,000,000
SEK
|
— | — | — |
313,000,000
SEK
|
-
SEK
|
25,000,000
SEK
|
40,000,000
SEK
|
312,000,000
SEK
|
5 829
SEK
|
273,000,000
SEK
|
5 883
SEK
|
-
SEK
|
-
SEK
|
53,000,000
SEK
|
25,000,000
SEK
|
25,000,000
SEK
|
-
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
2,000,000
SEK
|
— | — |
107,000,000
SEK
|
— | — | — | — |
-
SEK
|
— | — |
-
SEK
|
105,000,000
SEK
|
107,000,000
SEK
|
66,000,000
SEK
|
— | — | — | — | — |
68,000,000
SEK
|
— |
-
SEK
|
-
SEK
|
— | — |
2,000,000
SEK
|
68,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — |
5,000,000
SEK
|
— |
28,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
4,000,000
SEK
|
— | — |
114,000,000
SEK
|
— |
5,000,000
SEK
|
— | — |
-
SEK
|
— | — |
-
SEK
|
110,000,000
SEK
|
119,000,000
SEK
|
94,000,000
SEK
|
— | — | — | — | — |
98,000,000
SEK
|
— |
-
SEK
|
-
SEK
|
— |
7,000,000
SEK
|
3,000,000
SEK
|
91,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
550,000,000
SEK
|
— | — | — | — | — |
-
SEK
|
— |
56,000,000
SEK
|
494,000,000
SEK
|
— |
-
SEK
|
-
SEK
|
550,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase through other contributions by owners, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
24,000,000
SEK
|
— | — | — | — | — |
24,000,000
SEK
|
— |
-
SEK
|
-
SEK
|
— |
-
SEK
|
-
SEK
|
24,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |