Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 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 |
2021-01-01 to 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 |
As at 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 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 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 |
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 | — |
16 579
SEK
|
1 245
SEK
|
— | — |
25 176
SEK
|
— |
24 750
SEK
|
6 789
SEK
|
— |
427,000,000
SEK
|
136,000,000
SEK
|
— | — | — |
14 422
SEK
|
462,000,000
SEK
|
21 024
SEK
|
136,000,000
SEK
|
— |
323,000,000
SEK
|
6 789
SEK
|
— | — |
21 486
SEK
|
— | — | — |
20 496
SEK
|
477,000,000
SEK
|
1 965
SEK
|
20 973
SEK
|
6 789
SEK
|
11 606
SEK
|
136,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — | — | — | — | — | — |
3 000
SEK
|
— |
3 273
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — |
1 580
SEK
|
— |
2 327
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
37,000,000
SEK
|
— | — |
1 568
SEK
|
4 543
SEK
|
— |
–
SEK
|
— | — |
–
SEK
|
— | — |
4 580
SEK
|
2 974
SEK
|
946,000,000
SEK
|
— | — | — | — |
3 225
SEK
|
— | — |
2 28 8
SEK
|
–
SEK
|
— |
9,000,000
SEK
|
–
SEK
|
936,000,000
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
41,000,000
SEK
|
— | — |
–
SEK
|
8 17
SEK
|
— |
–
SEK
|
— | — |
–
SEK
|
— | — |
858,000,000
SEK
|
817,000,000
SEK
|
433,000,000
SEK
|
— | — | — | — |
4 09
SEK
|
— | — |
–
SEK
|
–
SEK
|
— |
24,000,000
SEK
|
–
SEK
|
409,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
32,000,000
SEK
|
— | — |
–
SEK
|
–
SEK
|
— |
–
SEK
|
— | — |
–
SEK
|
— | — |
32,000,000
SEK
|
–
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |