Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
As at 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 |
As at 2022-12-31 |
2022-01-01 to 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 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity | — |
6 047
SEK
|
— |
1 109
SEK
|
— |
3 073
SEK
|
— | — |
30,000,000
SEK
|
637,000,000
SEK
|
4 938
SEK
|
1 077
SEK
|
2 275
SEK
|
— |
5 744
SEK
|
— | — | — |
1 106
SEK
|
— |
2 647
SEK
|
30,000,000
SEK
|
373,000,000
SEK
|
4 638
SEK
|
2 275
SEK
|
— |
687,000,000
SEK
|
— |
473,000,000
SEK
|
1 106
SEK
|
4 941
SEK
|
1 924
SEK
|
2 275
SEK
|
3 835
SEK
|
30,000,000
SEK
|
79,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||
| Profit (loss) |
711,000,000
SEK
|
— |
559,000,000
SEK
|
— |
152,000,000
SEK
|
— |
559,000,000
SEK
|
— | — | — | — | — | — | — | — |
801,000,000
SEK
|
706,000,000
SEK
|
95,000,000
SEK
|
— | — | — | — | — | — | — |
706,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
125,000,000
SEK
|
— |
125,000,000
SEK
|
— | — | — |
1,000,000
SEK
|
264,000,000
SEK
|
— | — | — | — | — |
390,000,000
SEK
|
— |
93,000,000
SEK
|
13,000,000
SEK
|
— | — |
214,000,000
SEK
|
— | — | — | — | — |
93,000,000
SEK
|
— |
294,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
586,000,000
SEK
|
— |
434,000,000
SEK
|
— |
152,000,000
SEK
|
— |
560,000,000
SEK
|
264,000,000
SEK
|
— | — | — | — | — |
390,000,000
SEK
|
— |
894,000,000
SEK
|
719,000,000
SEK
|
95,000,000
SEK
|
— |
214,000,000
SEK
|
— | — | — | — | — |
799,000,000
SEK
|
— |
294,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity |
8,000,000
SEK
|
— |
8,000,000
SEK
|
— | — | — |
8,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
4,000,000
SEK
|
— |
4,000,000
SEK
|
— | — | — |
4,000,000
SEK
|
— | — | — | — | — | — | — | — |
4,000,000
SEK
|
4,000,000
SEK
|
— | — | — | — | — | — | — | — |
4,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |