Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
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 |
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 |
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 |
27 725
SEK
|
13 953
SEK
|
— | — |
46 992
SEK
|
— |
718,000,000
SEK
|
— |
281,000,000
SEK
|
— |
76,000,000
SEK
|
4 238
SEK
|
— | — | — |
26 457
SEK
|
11 297
SEK
|
316,000,000
SEK
|
4 238
SEK
|
— | — |
73,000,000
SEK
|
281,000,000
SEK
|
— | — |
42 516
SEK
|
— | — |
10 366
SEK
|
92,000,000
SEK
|
281,000,000
SEK
|
40 111
SEK
|
25 052
SEK
|
83,000,000
SEK
|
4 238
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
-
SEK
|
-
SEK
|
— |
-
SEK
|
— |
-
SEK
|
— |
-
SEK
|
— | — |
3 004
SEK
|
3 004
SEK
|
1 979
SEK
|
— | — | — | — |
1 979
SEK
|
-
SEK
|
— | — |
-
SEK
|
-
SEK
|
— |
-
SEK
|
-
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — |
402,000,000
SEK
|
2 656
SEK
|
— |
-
SEK
|
— |
149,000,000
SEK
|
— |
-
SEK
|
— | — |
3 201
SEK
|
6,000,000
SEK
|
989,000,000
SEK
|
— | — | — | — |
12,000,000
SEK
|
234,000,000
SEK
|
— | — |
932,000,000
SEK
|
-
SEK
|
— |
165,000,000
SEK
|
-
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income | — | — |
402,000,000
SEK
|
2 656
SEK
|
— |
-
SEK
|
— |
149,000,000
SEK
|
— |
-
SEK
|
— | — |
6 204
SEK
|
2 997
SEK
|
2 968
SEK
|
— | — | — | — |
1 967
SEK
|
234,000,000
SEK
|
— | — |
932,000,000
SEK
|
-
SEK
|
— |
165,000,000
SEK
|
-
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — |
-
SEK
|
-
SEK
|
— |
-
SEK
|
— |
-
SEK
|
— |
-
SEK
|
— | — |
12,000,000
SEK
|
12,000,000
SEK
|
2,000,000
SEK
|
— | — | — | — |
2,000,000
SEK
|
-
SEK
|
— | — |
-
SEK
|
-
SEK
|
— |
-
SEK
|
-
SEK
|
— | — | — | — | — | — | — |