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 |
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 |
2020-01-01 to 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 |
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 4
SEK
|
31 227
SEK
|
357,000,000
SEK
|
— |
31 686
SEK
|
133,000,000
SEK
|
13 3
SEK
|
— | — | — |
29 018
SEK
|
81,000,000
SEK
|
133,000,000
SEK
|
— |
83,000,000
SEK
|
1,000,000
SEK
|
— |
29 148
SEK
|
— |
80,000,000
SEK
|
442,000,000
SEK
|
26 090
SEK
|
25 502
SEK
|
67,000,000
SEK
|
133,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — | — |
4 381
SEK
|
— |
5 324
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — |
129,000,000
SEK
|
— |
1 437
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
5,000,000
SEK
|
— | — | — |
358,000,000
SEK
|
— | — | — |
4 510
SEK
|
4 147
SEK
|
3 887
SEK
|
— | — | — |
4 329
SEK
|
— | — |
44 3
SEK
|
— |
1,000,000
SEK
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — | — | — |
1 918
SEK
|
1 918
SEK
|
7 9 9
SEK
|
— | — | — |
7 9 9
SEK
|
— | — | — | — | — | — | — | — | — | — | — |