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 |
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 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
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 2021-12-31 |
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 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||
| Equity |
3,870,300,000
SEK
|
— | — | — | — |
532,200,000
SEK
|
35,500,000
SEK
|
1,673,400,000
SEK
|
353,600,000
SEK
|
3,834,800,000
SEK
|
1,275,600,000
SEK
|
— | — |
1,420,200,000
SEK
|
227,100,000
SEK
|
1,275,600,000
SEK
|
— | — |
3,303,900,000
SEK
|
3,276,500,000
SEK
|
27,400,000
SEK
|
353,600,000
SEK
|
— | — |
1,201,200,000
SEK
|
20,900,000
SEK
|
1,275,600,000
SEK
|
2,887,000,000
SEK
|
353,600,000
SEK
|
56,600,000
SEK
|
2,907,800,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
486,500,000
SEK
|
470,000,000
SEK
|
16,500,000
SEK
|
— | — | — | — | — | — |
470,000,000
SEK
|
8,700,000
SEK
|
— | — | — | — |
322,300,000
SEK
|
— | — | — | — |
331,100,000
SEK
|
322,300,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — |
305,100,000
SEK
|
324,200,000
SEK
|
18,300,000
SEK
|
800,000
SEK
|
— | — | — | — | — | — |
323,400,000
SEK
|
300,000
SEK
|
— | — | — |
170,500,000
SEK
|
176,800,000
SEK
|
— | — | — | — |
177,100,000
SEK
|
6,300,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income | — | — |
810,700,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
508,200,000
SEK
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — |
136,500,000
SEK
|
127,300,000
SEK
|
9,200,000
SEK
|
— | — | — | — | — | — |
127,300,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — |
107,800,000
SEK
|
107,800,000
SEK
|
— | — | — | — | — | — | — |
107,800,000
SEK
|
2,500,000
SEK
|
— | — | — | — |
109,600,000
SEK
|
— | — | — | — |
112,100,000
SEK
|
109,600,000
SEK
|
— | — | — | — | — | — | — |