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 |
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 |
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 |
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 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 |
704,000,000
SEK
|
225,000,000
SEK
|
3,055,000,000
SEK
|
— |
4,229,000,000
SEK
|
6,000,000
SEK
|
— |
231,000,000
SEK
|
245,000,000
SEK
|
— | — | — |
60,000,000
SEK
|
4,940,000,000
SEK
|
— |
46,000,000
SEK
|
2,849,000,000
SEK
|
242,000,000
SEK
|
— |
60,000,000
SEK
|
14,000,000
SEK
|
— |
8,045,000,000
SEK
|
383,000,000
SEK
|
20,000,000
SEK
|
403,000,000
SEK
|
2,849,000,000
SEK
|
7,818,000,000
SEK
|
4,344,000,000
SEK
|
242,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — | — | — | — |
3,692,000,000
SEK
|
3,692,000,000
SEK
|
— | — |
491,000,000
SEK
|
— | — | — |
491,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — |
211,000,000
SEK
|
— | — | — | — | — | — |
211,000,000
SEK
|
— | — | — |
369,000,000
SEK
|
— | — | — | — | — | — |
369,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — |
211,000,000
SEK
|
— | — | — | — | — | — |
3,903,000,000
SEK
|
3,692,000,000
SEK
|
— | — |
122,000,000
SEK
|
— | — | — |
491,000,000
SEK
|
— | — |
369,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — |
3,000,000
SEK
|
— | — |
206,000,000
SEK
|
209,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |