Statement Of Changes In Equity [Abstract]
| Concept |
As at 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 |
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 |
As at 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 |
2 801,1
SEK
|
1 372,9
SEK
|
4 233,7
SEK
|
— |
23,000,000
SEK
|
574,000,000
SEK
|
— | — |
1 781,0
SEK
|
— |
1 372,9
SEK
|
574,000,000
SEK
|
— |
14,000,000
SEK
|
3 209,8
SEK
|
— |
0
SEK
|
8,779,000,000
SEK
|
2 238,5
SEK
|
1 306,4
SEK
|
542,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — |
1 044,4
SEK
|
1 044,4
SEK
|
— |
4,745,000,000
SEK
|
— | — |
4,745,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — |
38,000,000
SEK
|
— | — |
38,000,000
SEK
|
— | — |
14,000,000
SEK
|
— | — | — | — | — |
14,000,000
SEK
|
— | — | — | — | — |
| Comprehensive income | — | — | — |
38,000,000
SEK
|
— | — |
1 048,1
SEK
|
1 044,4
SEK
|
— |
4,731,000,000
SEK
|
— | — |
4,745,000,000
SEK
|
— | — |
14,000,000
SEK
|
— | — | — | — | — |