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 |
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 |
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 |
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 |
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 |
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 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||
| Equity | — |
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
|
— | — | — |
1 072
SEK
|
185,000,000
SEK
|
289,000,000
SEK
|
1 612
SEK
|
177,000,000
SEK
|
— | — |
20,000,000
SEK
|
— | — |
1 797
SEK
|
— | — |
95,000,000
SEK
|
— |
1 522
SEK
|
214,000,000
SEK
|
13,000,000
SEK
|
280,000,000
SEK
|
1 736
SEK
|
1 009
SEK
|
48,000,000
SEK
|
173,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
46,000,000
SEK
|
— | — |
174,000,000
SEK
|
— | — | — | — | — | — | — | — |
128,000,000
SEK
|
174,000,000
SEK
|
74,000,000
SEK
|
— | — | — | — | — |
65,000,000
SEK
|
— | — | — | — | — | — |
9,000,000
SEK
|
— |
65,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Other comprehensive income |
1,000,000
SEK
|
— | — |
24,000,000
SEK
|
— | — |
14,000,000
SEK
|
77,000,000
SEK
|
— | — | — | — |
25,000,000
SEK
|
87,000,000
SEK
|
11,000,000
SEK
|
— | — | — | — | — | — |
47,000,000
SEK
|
— | — | — | — |
33,000,000
SEK
|
3,000,000
SEK
|
— |
14,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
45,000,000
SEK
|
— | — |
198,000,000
SEK
|
— | — |
14,000,000
SEK
|
77,000,000
SEK
|
— | — | — | — |
153,000,000
SEK
|
261,000,000
SEK
|
85,000,000
SEK
|
— | — | — | — | — |
65,000,000
SEK
|
47,000,000
SEK
|
— | — | — | — |
33,000,000
SEK
|
6,000,000
SEK
|
— |
79,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
15,000,000
SEK
|
— | — | — | — | — | — | — | — |
11,000,000
SEK
|
4,000,000
SEK
|
— | — | — | — |
15,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — |
80,000,000
SEK
|
— | — | — | — | — | — | — | — |
80,000,000
SEK
|
80,000,000
SEK
|
0
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
0
SEK
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
8,000,000
SEK
|
— | — |
49,000,000
SEK
|
— | — | — | — | — | — | — | — |
57,000,000
SEK
|
49,000,000
SEK
|
37,000,000
SEK
|
— | — | — | — | — |
2,000,000
SEK
|
— | — | — | — | — | — |
35,000,000
SEK
|
— |
2,000,000
SEK
|
— | — | — | — | — | — | — | — |