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 |
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 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||
| Equity |
3 232
SEK
|
786,000,000
SEK
|
5 216
SEK
|
— |
1 181
SEK
|
17,000,000
SEK
|
— | — | — |
2 074
SEK
|
17,000,000
SEK
|
— |
786,000,000
SEK
|
1 175
SEK
|
4 053
SEK
|
— |
786,000,000
SEK
|
— |
1 165
SEK
|
3 840
SEK
|
1 872
SEK
|
— |
17,000,000
SEK
|
— |
1 167
SEK
|
2 780
SEK
|
–
SEK
|
17,000,000
SEK
|
1 596
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — |
1 209
SEK
|
— |
256,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — |
–
SEK
|
— |
–
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — |
1 209
SEK
|
1 209
SEK
|
256,000,000
SEK
|
— | — |
256,000,000
SEK
|
— | — | — | — | — |
290,000,000
SEK
|
— | — | — |
290,000,000
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
SEK
|
— | — | — |
1,000,000
SEK
|
— | — | — | — | — | — | — |
| Decrease through other distributions to owners, equity | — | — | — | — | — | — |
52,000,000
SEK
|
52,000,000
SEK
|
54,000,000
SEK
|
— | — |
54,000,000
SEK
|
— | — | — | — | — |
13,000,000
SEK
|
— | — | — |
13,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — |
6,000,000
SEK
|
— | — |
6,000,000
SEK
|
— |
8,000,000
SEK
|
— | — | — | — | — | — |
8,000,000
SEK
|
— | — | — | — | — |
2,000,000
SEK
|
— |
2,000,000
SEK
|
— | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — | — | — |
18,000,000
SEK
|
— | — | — | — | — | — |
18,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — |