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 |
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 |
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 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 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 |
5 926
SEK
|
— | — | — | — | — |
61,000,000
SEK
|
125,000,000
SEK
|
2 606
SEK
|
141,000,000
SEK
|
5 801
SEK
|
2 993
SEK
|
— | — | — |
2 356
SEK
|
317,000,000
SEK
|
2 993
SEK
|
— | — |
5 229
SEK
|
5 174
SEK
|
55,000,000
SEK
|
— |
141,000,000
SEK
|
— | — | — |
1 809
SEK
|
68,000,000
SEK
|
2 993
SEK
|
4 527
SEK
|
141,000,000
SEK
|
416,000,000
SEK
|
4 595
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — |
477,000,000
SEK
|
454,000,000
SEK
|
23,000,000
SEK
|
— | — | — | — | — | — |
454,000,000
SEK
|
— |
14,000,000
SEK
|
— | — | — | — |
572,000,000
SEK
|
— | — | — | — | — | — |
587,000,000
SEK
|
572,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — |
377,000,000
SEK
|
385,000,000
SEK
|
2,000,000
SEK
|
5,000,000
SEK
|
— | — | — | — | — | — |
379,000,000
SEK
|
— |
4,000,000
SEK
|
— | — | — |
99,000,000
SEK
|
96,000,000
SEK
|
— | — | — | — | — | — |
100,000,000
SEK
|
3,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income | — |
–
SEK
|
377,000,000
SEK
|
861,000,000
SEK
|
456,000,000
SEK
|
28,000,000
SEK
|
— | — | — | — | — | — |
833,000,000
SEK
|
–
SEK
|
18,000,000
SEK
|
— | — | — |
99,000,000
SEK
|
669,000,000
SEK
|
— | — | — |
–
SEK
|
— |
–
SEK
|
687,000,000
SEK
|
569,000,000
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — |
184,000,000
SEK
|
168,000,000
SEK
|
16,000,000
SEK
|
— | — | — | — | — | — |
168,000,000
SEK
|
— |
19,000,000
SEK
|
— | — | — | — |
–
SEK
|
— | — | — | — | — | — |
19,000,000
SEK
|
–
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — |
23,000,000
SEK
|
23,000,000
SEK
|
— | — | — | — | — | — | — |
23,000,000
SEK
|
— | — | — | — | — | — |
20,000,000
SEK
|
— | — | — | — | — | — |
20,000,000
SEK
|
20,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — |
48,000,000
SEK
|
9,000,000
SEK
|
57,000,000
SEK
|
— | — | — | — | — | — |
9,000,000
SEK
|
— |
12,000,000
SEK
|
— | — | — | — |
9,000,000
SEK
|
— | — | — | — | — | — |
20,000,000
SEK
|
9,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — |
6,000,000
SEK
|
6,000,000
SEK
|
— | — | — | — | — | — | — |
6,000,000
SEK
|
— | — | — | — | — | — |
7,000,000
SEK
|
— | — | — | — | — | — |
7,000,000
SEK
|
7,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) in equity | — |
–
SEK
|
–
SEK
|
164,000,000
SEK
|
206,000,000
SEK
|
42,000,000
SEK
|
— | — | — | — | — | — |
206,000,000
SEK
|
–
SEK
|
31,000,000
SEK
|
— | — | — |
–
SEK
|
24,000,000
SEK
|
— | — | — |
–
SEK
|
— |
–
SEK
|
53,000,000
SEK
|
24,000,000
SEK
|
— | — | — | — | — | — | — |