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 |
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 |
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 |
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 |
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 |
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 | — |
117 501
SEK
|
58,000,000
SEK
|
— | — |
17 275
SEK
|
— |
161 696
SEK
|
2,000,000
SEK
|
— |
3 248
SEK
|
0
SEK
|
— | — |
161 670
SEK
|
26,000,000
SEK
|
5 294
SEK
|
24 904
SEK
|
— | — | — |
111 364
SEK
|
1,000,000
SEK
|
25,000,000
SEK
|
62,000,000
SEK
|
17 275
SEK
|
155 168
SEK
|
24 904
SEK
|
— |
0
SEK
|
— | — |
4 355
SEK
|
2 669
SEK
|
155 193
SEK
|
— | — | — | — | — |
138 608
SEK
|
25,000,000
SEK
|
6 279
SEK
|
17 275
SEK
|
138 633
SEK
|
94 060
SEK
|
5,000,000
SEK
|
3 880
SEK
|
8,000,000
SEK
|
24 904
SEK
|
33,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
1,000,000
SEK
|
— | — | — | — | — |
20 871
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
20 872
SEK
|
20 871
SEK
|
12 929
SEK
|
— | — | — | — | — | — | — |
12 929
SEK
|
— | — | — | — | — | — | — |
0
SEK
|
— |
12 929
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 725
SEK
|
— |
3 454
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
1,000,000
SEK
|
— | — |
4,000,000
SEK
|
1,000,000
SEK
|
— |
22 596
SEK
|
— | — |
0
SEK
|
— | — |
579,000,000
SEK
|
939,000,000
SEK
|
— | — | — | — |
22 597
SEK
|
22 231
SEK
|
16 383
SEK
|
— | — | — | — | — | — | — |
17 127
SEK
|
— |
1 211
SEK
|
7,000,000
SEK
|
— | — | — |
1 924
SEK
|
0
SEK
|
5,000,000
SEK
|
16 383
SEK
|
29,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — |
16 310
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
16 310
SEK
|
16 310
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — |
195,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
195,000,000
SEK
|
195,000,000
SEK
|
178,000,000
SEK
|
— | — | — | — | — | — | — |
178,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
178,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — |