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 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 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 |
As at 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 |
2 005
SEK
|
— | — | — |
68,000,000
SEK
|
484,000,000
SEK
|
1 049
SEK
|
404,000,000
SEK
|
783,000,000
SEK
|
22,000,000
SEK
|
— |
1 693
SEK
|
484,000,000
SEK
|
404,000,000
SEK
|
— | — |
710,000,000
SEK
|
401,000,000
SEK
|
32,000,000
SEK
|
433,000,000
SEK
|
1 512
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||
| Profit (loss) | — | — |
382,000,000
SEK
|
382,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
223,000,000
SEK
|
223,000,000
SEK
|
— | — | — | — | — |
| Other comprehensive income | — |
46,000,000
SEK
|
50,000,000
SEK
|
4,000,000
SEK
|
— | — | — | — | — | — |
54,000,000
SEK
|
— | — | — |
54,000,000
SEK
|
0
SEK
|
— | — | — | — | — |
| Comprehensive income | — |
46,000,000
SEK
|
432,000,000
SEK
|
386,000,000
SEK
|
— | — | — | — | — | — |
54,000,000
SEK
|
— | — | — |
277,000,000
SEK
|
223,000,000
SEK
|
— | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — |
3,000,000
SEK
|
3,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
6,000,000
SEK
|
6,000,000
SEK
|
— | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — |
23,000,000
SEK
|
23,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
72,000,000
SEK
|
72,000,000
SEK
|
— | — | — | — | — |