Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
2020-01-01 to 2020-12-31 |
As at 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||
| Equity |
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
|
29,000,000
SEK
|
433,000,000
SEK
|
1 410
SEK
|
547,000,000
SEK
|
401,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — |
223,000,000
SEK
|
223,000,000
SEK
|
163,000,000
SEK
|
— | — |
163,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — |
54,000,000
SEK
|
— | — | — |
54,000,000
SEK
|
0
SEK
|
61,000,000
SEK
|
— | — |
0
SEK
|
— | — |
61,000,000
SEK
|
— | — | — | — | — | — |
| Comprehensive income | — | — |
54,000,000
SEK
|
— | — | — |
277,000,000
SEK
|
223,000,000
SEK
|
1 02
SEK
|
— | — |
163,000,000
SEK
|
— | — |
61,000,000
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — | — | — | — |
6,000,000
SEK
|
6,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — | — | — | — | — |
72,000,000
SEK
|
72,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — |