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 |
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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||
| Equity | — |
471,000,000
SEK
|
8,000,000
SEK
|
— |
9,685,000,000
SEK
|
— |
9,473,000,000
SEK
|
212,000,000
SEK
|
— |
8,988,000,000
SEK
|
5,000,000
SEK
|
— | — | — |
24,000,000
SEK
|
197,000,000
SEK
|
2,863,000,000
SEK
|
6,000,000
SEK
|
— |
105,000,000
SEK
|
2,938,000,000
SEK
|
— | — |
3,060,000,000
SEK
|
— | — | — |
789,000,000
SEK
|
13,000,000
SEK
|
7,000,000
SEK
|
802,000,000
SEK
|
658,000,000
SEK
|
118,000,000
SEK
|
6,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||
| Profit (loss) |
1,000,000
SEK
|
— | — |
447,000,000
SEK
|
— | — | — | — | — | — | — |
448,000,000
SEK
|
447,000,000
SEK
|
19,000,000
SEK
|
— | — | — | — |
25,000,000
SEK
|
— | — | — | — | — |
6,000,000
SEK
|
— |
25,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — |
128,000,000
SEK
|
— |
135,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — | — | — | — | — | — |
576,000,000
SEK
|
— |
116,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — |
6,338,000,000
SEK
|
— |
6,335,000,000
SEK
|
— | — |
3,000,000
SEK
|
— | — |
6,338,000,000
SEK
|
— |
176,000,000
SEK
|
— | — | — | — | — | — | — | — |
0
SEK
|
— | — |
176,000,000
SEK
|
176,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — | — | — | — | — | — | — | — | — | — | — |
-
SEK
|
— | — | — | — |
38,000,000
SEK
|
— | — |
19,000,000
SEK
|
— | — |
2,000,000
SEK
|
17,000,000
SEK
|
2,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — | — | — | — | — | — | — | — | — | — |
88,000,000
SEK
|
— | — | — | — |
81,000,000
SEK
|
— | — | — | — | — |
7,000,000
SEK
|
— |
81,000,000
SEK
|
— | — | — | — | — | — | — |