Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
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 |
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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity | — |
2 038
SEK
|
— |
1 429
SEK
|
— | — |
50,000,000
SEK
|
— |
177,000,000
SEK
|
89,000,000
SEK
|
1 988
SEK
|
3,000,000
SEK
|
— |
296,000,000
SEK
|
2 430
SEK
|
— | — | — |
262,000,000
SEK
|
1 624
SEK
|
177,000,000
SEK
|
— |
83,000,000
SEK
|
2 168
SEK
|
11,000,000
SEK
|
296,000,000
SEK
|
— | — |
1 205
SEK
|
295,000,000
SEK
|
1 821
SEK
|
18,000,000
SEK
|
1 688
SEK
|
132,000,000
SEK
|
7,000,000
SEK
|
177,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||
| Profit (loss) |
9,000,000
SEK
|
— |
21,000,000
SEK
|
— |
12,000,000
SEK
|
21,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
683,000,000
SEK
|
491,000,000
SEK
|
192,000,000
SEK
|
— | — | — | — | — | — | — | — |
491,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income |
15,000,000
SEK
|
— |
15,000,000
SEK
|
— |
1,000,000
SEK
|
0
SEK
|
— |
7,000,000
SEK
|
— | — | — | — |
8,000,000
SEK
|
— | — |
117,000,000
SEK
|
45,000,000
SEK
|
12,000,000
SEK
|
— | — | — |
29,000,000
SEK
|
— | — | — | — |
105,000,000
SEK
|
89,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
7,000,000
SEK
|
— |
6,000,000
SEK
|
— |
13,000,000
SEK
|
21,000,000
SEK
|
— |
7,000,000
SEK
|
— | — | — | — |
8,000,000
SEK
|
— | — |
800,000,000
SEK
|
536,000,000
SEK
|
204,000,000
SEK
|
— | — | — |
29,000,000
SEK
|
— | — | — | — |
596,000,000
SEK
|
89,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
106,000,000
SEK
|
— |
106,000,000
SEK
|
— | — |
106,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
88,000,000
SEK
|
88,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
88,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
13,000,000
SEK
|
— |
12,000,000
SEK
|
— |
1,000,000
SEK
|
12,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
35,000,000
SEK
|
26,000,000
SEK
|
10,000,000
SEK
|
— | — | — | — | — | — | — | — |
26,000,000
SEK
|
— | — | — | — | — | — | — | — | — |