Statement Of Changes In Equity [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
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 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||
| Equity |
1,939,000,000
SEK
|
— | — | — | — |
217,000,000
SEK
|
1 815,9
SEK
|
1 657,9
SEK
|
142,000,000
SEK
|
— |
1 480,2
SEK
|
4,000,000
SEK
|
— |
3,496,000,000
SEK
|
— |
1 816,0
SEK
|
— |
142,000,000
SEK
|
— | — |
1 256,7
SEK
|
142,000,000
SEK
|
134,000,000
SEK
|
1 814,4
SEK
|
5,585,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||
| Profit (loss) | — | — | — |
1,776,000,000
SEK
|
1,776,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
2,235,000,000
SEK
|
2,235,000,000
SEK
|
— | — | — | — | — |
| Other comprehensive income | — | — |
221,000,000
SEK
|
221,000,000
SEK
|
— | — | — | — | — | — | — | — |
130,000,000
SEK
|
— | — | — | — | — |
130,000,000
SEK
|
— | — | — | — | — | — |
| Comprehensive income | — |
0
SEK
|
221,000,000
SEK
|
1,555,000,000
SEK
|
1,776,000,000
SEK
|
— | — | — | — |
0
SEK
|
— | — |
130,000,000
SEK
|
— |
0
SEK
|
— |
0
SEK
|
— |
2,105,000,000
SEK
|
2,235,000,000
SEK
|
— | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — |
1,000,000
SEK
|
— | — | — | — | — |
1,000,000
SEK
|
— | — | — | — |
15,000,000
SEK
|
— | — | — |
15,000,000
SEK
|
— | — | — | — | — | — |