Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 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 |
2023-01-01 to 2023-12-31 |
As at 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 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||
| Equity | — |
2 372,0
SEK
|
1 765,9
SEK
|
— | — | — |
12,000,000
SEK
|
2,590,000,000
SEK
|
— |
3,459,000,000
SEK
|
2 186,5
SEK
|
— | — | — |
1 526,2
SEK
|
12,000,000
SEK
|
3,132,000,000
SEK
|
3,459,000,000
SEK
|
— | — |
1 293,0
SEK
|
3,459,000,000
SEK
|
1 717,4
SEK
|
773,000,000
SEK
|
12,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||
| Profit (loss) |
3,409,000,000
SEK
|
— | — |
3,409,000,000
SEK
|
-
SEK
|
-
SEK
|
— | — |
-
SEK
|
— | — |
-
SEK
|
3,287,000,000
SEK
|
3,287,000,000
SEK
|
— | — | — | — |
-
SEK
|
-
SEK
|
— | — | — | — | — |
| Other comprehensive income |
262,000,000
SEK
|
— | — |
280,000,000
SEK
|
542,000,000
SEK
|
-
SEK
|
— | — |
-
SEK
|
— | — |
-
SEK
|
2,632,000,000
SEK
|
273,000,000
SEK
|
— | — | — | — |
2,359,000,000
SEK
|
-
SEK
|
— | — | — | — | — |
| Comprehensive income |
3,147,000,000
SEK
|
— | — |
3,689,000,000
SEK
|
542,000,000
SEK
|
-
SEK
|
— | — |
-
SEK
|
— | — |
-
SEK
|
5,919,000,000
SEK
|
3,560,000,000
SEK
|
— | — | — | — |
2,359,000,000
SEK
|
-
SEK
|
— | — | — | — | — |
| Dividends recognised as distributions to owners |
1,316,000,000
SEK
|
— | — |
1,316,000,000
SEK
|
-
SEK
|
-
SEK
|
— | — |
-
SEK
|
— | — |
-
SEK
|
1,228,000,000
SEK
|
1,228,000,000
SEK
|
— | — | — | — |
-
SEK
|
-
SEK
|
— | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
24,000,000
SEK
|
— | — |
24,000,000
SEK
|
-
SEK
|
-
SEK
|
— | — |
-
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |