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 |
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 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
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 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-01-01 |
As at 2020-01-01 |
As at 2020-01-01 |
As at 2020-01-01 |
As at 2020-01-01 |
As at 2020-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||
| Equity |
19 500
SEK
|
78,000,000
SEK
|
2 178
SEK
|
— | — |
21 948
SEK
|
21 948
SEK
|
192,000,000
SEK
|
— | — |
192,000,000
SEK
|
19 396
SEK
|
16 959
SEK
|
67,000,000
SEK
|
2 178
SEK
|
19 396
SEK
|
— |
16 959
SEK
|
2 178
SEK
|
19 396
SEK
|
192,000,000
SEK
|
— |
67,000,000
SEK
|
— |
19 396
SEK
|
— |
15 429
SEK
|
192,000,000
SEK
|
17 887
SEK
|
2 178
SEK
|
88,000,000
SEK
|
17 887
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — |
3 348
SEK
|
— | — | — |
3 348
SEK
|
3 348
SEK
|
— | — | — | — | — | — |
2 222
SEK
|
— | — | — | — |
2 222
SEK
|
— | — | — |
2 222
SEK
|
— | — | — | — | — | — |
| Other comprehensive income | — | — | — |
11,000,000
SEK
|
11,000,000
SEK
|
— | — | — |
11,000,000
SEK
|
— | — | — | — | — | — | — |
21,000,000
SEK
|
— | — | — | — | — | — |
21,000,000
SEK
|
— |
21,000,000
SEK
|
— | — | — | — | — | — |
| Comprehensive income | — | — | — |
11,000,000
SEK
|
3 359
SEK
|
— | — | — |
3 359
SEK
|
3 348
SEK
|
— | — | — | — | — | — |
2 201
SEK
|
— | — | — | — |
2 222
SEK
|
— |
21,000,000
SEK
|
— |
2 201
SEK
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — |
807,000,000
SEK
|
— | — | — |
807,000,000
SEK
|
807,000,000
SEK
|
— | — | — | — | — | — |
692,000,000
SEK
|
— | — | — | — |
692,000,000
SEK
|
— | — | — |
692,000,000
SEK
|
— | — | — | — | — | — |