Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity | — |
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
|
— | — |
4 303
SEK
|
32,000,000
SEK
|
232,000,000
SEK
|
2 993
SEK
|
4 335
SEK
|
1 401
SEK
|
141,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
14,000,000
SEK
|
— | — | — | — |
572,000,000
SEK
|
— | — | — | — | — | — |
587,000,000
SEK
|
572,000,000
SEK
|
446,000,000
SEK
|
— | — | — | — | — |
432,000,000
SEK
|
— | — | — | — | — |
15,000,000
SEK
|
432,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income |
4,000,000
SEK
|
— | — | — |
99,000,000
SEK
|
96,000,000
SEK
|
— | — | — | — | — | — |
100,000,000
SEK
|
3,000,000
SEK
|
182,000,000
SEK
|
— | — | — | — | — |
5,000,000
SEK
|
— |
184,000,000
SEK
|
— | — | — |
3,000,000
SEK
|
179,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income |
18,000,000
SEK
|
— | — | — |
99,000,000
SEK
|
669,000,000
SEK
|
— | — | — |
–
SEK
|
— |
–
SEK
|
687,000,000
SEK
|
569,000,000
SEK
|
265,000,000
SEK
|
— | — | — | — | — |
437,000,000
SEK
|
— |
184,000,000
SEK
|
–
SEK
|
–
SEK
|
— |
12,000,000
SEK
|
253,000,000
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
19,000,000
SEK
|
— | — | — | — |
–
SEK
|
— | — | — | — | — | — |
19,000,000
SEK
|
–
SEK
|
4,000,000
SEK
|
— | — | — | — | — |
–
SEK
|
— | — | — | — | — |
4,000,000
SEK
|
–
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — | — | — | — |
20,000,000
SEK
|
— | — | — | — | — | — |
20,000,000
SEK
|
20,000,000
SEK
|
18,000,000
SEK
|
— | — | — | — | — |
18,000,000
SEK
|
— | — | — | — | — | — |
18,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
12,000,000
SEK
|
— | — | — | — |
9,000,000
SEK
|
— | — | — | — | — | — |
20,000,000
SEK
|
9,000,000
SEK
|
13,000,000
SEK
|
— | — | — | — | — |
11,000,000
SEK
|
— | — | — | — | — |
24,000,000
SEK
|
11,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — |
7,000,000
SEK
|
— | — | — | — | — | — |
7,000,000
SEK
|
7,000,000
SEK
|
2,000,000
SEK
|
— | — | — | — | — |
2,000,000
SEK
|
— | — | — | — | — | — |
2,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) in equity |
31,000,000
SEK
|
— | — | — |
–
SEK
|
24,000,000
SEK
|
— | — | — |
–
SEK
|
— |
–
SEK
|
53,000,000
SEK
|
24,000,000
SEK
|
5,000,000
SEK
|
— | — | — | — | — |
29,000,000
SEK
|
— |
–
SEK
|
–
SEK
|
–
SEK
|
— |
24,000,000
SEK
|
29,000,000
SEK
|
— | — | — | — | — | — | — |