Statement Of Changes In Equity [Abstract]
| Concept |
As at 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 |
2021-01-01 to 2021-12-31 |
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 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
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 |
14 186,8
SEK
|
2 592,0
SEK
|
— |
17 457,4
SEK
|
— |
6,786,000,000
SEK
|
— | — | — |
11 280,8
SEK
|
6,581,000,000
SEK
|
— |
2 118,5
SEK
|
— | — |
14 057,4
SEK
|
1 903,7
SEK
|
12 631,7
SEK
|
10 076,6
SEK
|
6,514,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — |
3 367,7
SEK
|
— |
1 632,2
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — |
–
SEK
|
— |
–
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — |
3 367,7
SEK
|
3 367,7
SEK
|
1 632,2
SEK
|
— | — |
1 632,2
SEK
|
— | — | — | — | — | — | — | — |
| Issue of equity | — | — |
4,735,000,000
SEK
|
— |
205,000,000
SEK
|
— |
4,940,000,000
SEK
|
— |
2,215,000,000
SEK
|
— | — | — | — |
2,148,000,000
SEK
|
67,000,000
SEK
|
— | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — |
4,617,000,000
SEK
|
4,617,000,000
SEK
|
4,280,000,000
SEK
|
— | — |
4,280,000,000
SEK
|
— | — | — | — | — | — | — | — |