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 |
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 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity | — |
14 489
SEK
|
— | — |
13 053
SEK
|
— |
693,000,000
SEK
|
— |
14,000,000
SEK
|
— |
729,000,000
SEK
|
14 475
SEK
|
12 773
SEK
|
— | — | — | — | — |
844,000,000
SEK
|
14,000,000
SEK
|
11 186
SEK
|
729,000,000
SEK
|
12 759
SEK
|
— |
9 239
SEK
|
325,000,000
SEK
|
10 303
SEK
|
10 292
SEK
|
11,000,000
SEK
|
728,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) |
2 866
SEK
|
— |
2 865
SEK
|
–
SEK
|
— |
1,000,000
SEK
|
— |
2 865
SEK
|
— |
–
SEK
|
— | — | — |
–
SEK
|
–
SEK
|
2 681
SEK
|
2 682
SEK
|
1,000,000
SEK
|
— | — | — | — | — |
2 682
SEK
|
— | — | — | — | — | — |
| Other comprehensive income |
195,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
627,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
2 671
SEK
|
— |
2 670
SEK
|
151,000,000
SEK
|
— |
1,000,000
SEK
|
— |
2 821
SEK
|
— |
–
SEK
|
— | — | — |
–
SEK
|
519,000,000
SEK
|
3 308
SEK
|
2 790
SEK
|
1,000,000
SEK
|
— | — | — | — | — |
3 309
SEK
|
— | — | — | — | — | — |
| Issue of equity |
–
SEK
|
— |
–
SEK
|
–
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— | — | — |
1,000,000
SEK
|
–
SEK
|
11,000,000
SEK
|
10,000,000
SEK
|
–
SEK
|
— | — | — | — | — |
11,000,000
SEK
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners |
946,000,000
SEK
|
— |
946,000,000
SEK
|
–
SEK
|
— |
–
SEK
|
— |
946,000,000
SEK
|
— |
–
SEK
|
— | — | — |
–
SEK
|
–
SEK
|
837,000,000
SEK
|
837,000,000
SEK
|
–
SEK
|
— | — | — | — | — |
837,000,000
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through other changes, equity |
–
SEK
|
— |
–
SEK
|
–
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— |
–
SEK
|
— | — | — |
–
SEK
|
–
SEK
|
0
SEK
|
4,000,000
SEK
|
4,000,000
SEK
|
— | — | — | — | — |
4,000,000
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
1,000,000
SEK
|
— |
0
SEK
|
–
SEK
|
— |
1,000,000
SEK
|
— |
0
SEK
|
— |
–
SEK
|
— | — | — |
–
SEK
|
–
SEK
|
0
SEK
|
0
SEK
|
0
SEK
|
— | — | — | — | — |
0
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
43,000,000
SEK
|
— |
43,000,000
SEK
|
–
SEK
|
— |
–
SEK
|
— |
43,000,000
SEK
|
— |
–
SEK
|
— | — | — |
–
SEK
|
–
SEK
|
32,000,000
SEK
|
32,000,000
SEK
|
–
SEK
|
— | — | — | — | — |
32,000,000
SEK
|
— | — | — | — | — | — |