Statement Of Changes In Equity [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
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 |
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 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||
| Equity |
4,705,000,000.0
SEK
|
— | — | — | — |
39,000,000.0
SEK
|
25,000,000.0
SEK
|
4,185,000,000.0
SEK
|
534,000,000.0
SEK
|
— |
4,953,000,000.0
SEK
|
1,000,000.0
SEK
|
— |
5,481,000,000.0
SEK
|
— |
25,000,000.0
SEK
|
— |
503,000,000.0
SEK
|
— | — |
5,351,000,000.0
SEK
|
503,000,000.0
SEK
|
0.0
SEK
|
25,000,000.0
SEK
|
5,880,000,000.0
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||
| Profit (loss) | — |
–
SEK
|
–
SEK
|
935,000,000.0
SEK
|
935,000,000.0
SEK
|
— | — | — | — |
–
SEK
|
— | — |
–
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— |
399,000,000.0
SEK
|
399,000,000.0
SEK
|
— | — | — | — | — |
| Other comprehensive income | — |
–
SEK
|
39,000,000.0
SEK
|
39,000,000.0
SEK
|
–
SEK
|
— | — | — | — |
–
SEK
|
— | — |
–
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— |
–
SEK
|
–
SEK
|
— | — | — | — | — |
| Comprehensive income | — |
–
SEK
|
39,000,000.0
SEK
|
974,000,000.0
SEK
|
935,000,000.0
SEK
|
— | — | — | — |
–
SEK
|
— | — |
0.0
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— |
399,000,000.0
SEK
|
399,000,000.0
SEK
|
— | — | — | — | — |
| Issue of equity | — |
31,000,000.0
SEK
|
–
SEK
|
198,000,000.0
SEK
|
167,000,000.0
SEK
|
— | — | — | — |
–
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |