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 |
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 |
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 |
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 | — |
1 116
SEK
|
1 976
SEK
|
— |
842,000,000
SEK
|
— |
840,000,000
SEK
|
2,000,000
SEK
|
— |
21,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — |
1 088
SEK
|
1,000,000
SEK
|
1 639
SEK
|
555,000,000
SEK
|
1,000,000
SEK
|
— |
3,000,000
SEK
|
556,000,000
SEK
|
— | — | — |
675,000,000
SEK
|
1,000,000
SEK
|
2,000,000
SEK
|
1 636
SEK
|
676,000,000
SEK
|
960,000,000
SEK
|
1,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||
| Profit (loss) |
0
SEK
|
— | — |
3 147
SEK
|
— | — | — | — | — | — | — | — |
3 147
SEK
|
3 147
SEK
|
134,000,000
SEK
|
— | — | — | — | — |
134,000,000
SEK
|
— | — | — |
0
SEK
|
134,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — | — |
24,000,000
SEK
|
— |
24,000,000
SEK
|
— | — | — | — | — | — |
24,000,000
SEK
|
— |
5,000,000
SEK
|
— | — | — | — | — | — | — | — |
5,000,000
SEK
|
— |
5,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income |
0
SEK
|
— | — |
3 123
SEK
|
— |
24,000,000
SEK
|
— | — | — | — | — | — |
3 123
SEK
|
3 147
SEK
|
129,000,000
SEK
|
— | — | — | — | — |
134,000,000
SEK
|
— | — |
5,000,000
SEK
|
0
SEK
|
129,000,000
SEK
|
— | — | — | — | — | — | — |
| Issue of equity | — | — | — |
294,000,000
SEK
|
— | — | — | — |
0
SEK
|
— | — |
294,000,000
SEK
|
294,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — | — |
3,000,000
SEK
|
— | — | — | — | — | — | — | — |
3,000,000
SEK
|
3,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — |
7,000,000
SEK
|
— | — | — | — | — | — | — | — |
7,000,000
SEK
|
7,000,000
SEK
|
6,000,000
SEK
|
— | — | — | — | — |
6,000,000
SEK
|
— | — | — | — |
6,000,000
SEK
|
— | — | — | — | — | — | — |