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 |
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 |
2020-01-01 to 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 |
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 |
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 |
4,953,000,000.0
SEK
|
0 ,1
SEK
|
— |
5 4 8 ,1
SEK
|
— |
25,000,000.0
SEK
|
— |
50, 3
SEK
|
— | — | — |
5 3 5 ,1
SEK
|
50, 3
SEK
|
— |
0.0
SEK
|
25,000,000.0
SEK
|
— | — |
58 8 ,0
SEK
|
— |
0, 5
SEK
|
–
SEK
|
528 ,0
SEK
|
4 7 7, 4
SEK
|
5 0 ,1
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||
| Profit (loss) | — | — |
–
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— |
39, 9
SEK
|
399,000,000.0
SEK
|
6 7, 0
SEK
|
— | — |
67, 0
SEK
|
— | — |
–
SEK
|
–
SEK
|
— |
–
SEK
|
— | — | — | — | — |
| Other comprehensive income | — | — |
0.0
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— |
0.0
SEK
|
–
SEK
|
0, 5
SEK
|
— | — |
–
SEK
|
— | — |
0, 5
SEK
|
–
SEK
|
— |
–
SEK
|
— | — | — | — | — |
| Comprehensive income | — | — |
0.0
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— |
39, 9
SEK
|
39, 9
SEK
|
6 7, 5
SEK
|
— | — |
6 7, 0
SEK
|
— | — |
0, 5
SEK
|
–
SEK
|
— |
–
SEK
|
— | — | — | — | — |
| Increase through other contributions by owners, equity | — | — | — | — | — | — | — | — | — | — |
1,250,000,000.0
SEK
|
— | — |
125 ,0
SEK
|
— | — |
–
SEK
|
–
SEK
|
— |
–
SEK
|
— | — | — | — | — |