Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2021-01-01 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 |
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 |
2022-01-01 to 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 |
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 | — |
36 578
SEK
|
— |
26 838
SEK
|
1 17 7
SEK
|
— | — | — |
7 74 6
SEK
|
— |
817,000,000
SEK
|
33 463
SEK
|
— | — | — |
1 078
SEK
|
— |
3 616
SEK
|
27 988
SEK
|
7 81
SEK
|
— |
26 228
SEK
|
493,000,000
SEK
|
31 07 9
SEK
|
3 578
SEK
|
780,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||
| Profit (loss) |
13,000,000
SEK
|
— | — | — | — |
13,000,000
SEK
|
— | — | — | — | — | — | — |
2 718
SEK
|
2 718
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
99,000,000
SEK
|
— | — | — | — | — | — |
99,000,000
SEK
|
— | — | — | — | — |
585,000,000
SEK
|
— | — |
585,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income |
86,000,000
SEK
|
— | — | — | — |
13,000,000
SEK
|
— |
99,000,000
SEK
|
— | — | — | — | — |
3 303
SEK
|
2 718
SEK
|
— |
585,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Increase through other contributions by owners, equity |
4 212
SEK
|
— | — | — | — | — |
4 176
SEK
|
— | — |
36,000,000
SEK
|
— | — |
1,000,000
SEK
|
39,000,000
SEK
|
— | — | — | — | — | — |
38,000,000
SEK
|
— | — | — | — | — |
| Increase (decrease) through other changes, equity |
72,000,000
SEK
|
— |
46,000,000
SEK
|
— | — |
26,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
8,000,000
SEK
|
— | — | — | — |
8,000,000
SEK
|
— | — | — | — | — | — | — |
7,000,000
SEK
|
7,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |