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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||
| Equity | — |
1 647,3
SEK
|
1 275,6
SEK
|
— |
3 303,9
SEK
|
3 276,5
SEK
|
274,000,000
SEK
|
3,536,000,000
SEK
|
— | — | — |
1 257,7
SEK
|
209,000,000
SEK
|
1 275,6
SEK
|
2 887,0
SEK
|
3,536,000,000
SEK
|
— |
2 907,8
SEK
|
— | — |
2 777,0
SEK
|
1 275,6
SEK
|
2 777,0
SEK
|
1 147,7
SEK
|
3,536,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||
| Profit (loss) |
87,000,000
SEK
|
— | — |
3,223,000,000
SEK
|
— | — | — | — |
3,311,000,000
SEK
|
3,223,000,000
SEK
|
2,919,000,000
SEK
|
— | — | — | — | — |
2,871,000,000
SEK
|
— |
48,000,000
SEK
|
2,871,000,000
SEK
|
— | — | — | — | — |
| Other comprehensive income |
3,000,000
SEK
|
— | — |
1,768,000,000
SEK
|
— | — | — | — |
1,771,000,000
SEK
|
1,768,000,000
SEK
|
2,187,000,000
SEK
|
— | — | — | — | — |
2,176,000,000
SEK
|
— |
11,000,000
SEK
|
2,176,000,000
SEK
|
— | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — | — | — |
5,082,000,000
SEK
|
— |
732,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
25,000,000
SEK
|
— | — |
1,096,000,000
SEK
|
— | — | — | — |
1,121,000,000
SEK
|
1,096,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — | — | — | — | — | — | — |
575,000,000
SEK
|
— | — | — | — | — |
405,000,000
SEK
|
— |
172,000,000
SEK
|
405,000,000
SEK
|
— | — | — | — | — |