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 |
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 |
As at 2023-12-31 |
As at 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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||
| Equity | — |
3 864,2
SEK
|
— | — |
1 740,9
SEK
|
— |
4,663,000,000
SEK
|
— |
278,000,000
SEK
|
3,536,000,000
SEK
|
3 836,4
SEK
|
1 275,6
SEK
|
3 870,3
SEK
|
— | — | — | — |
5,322,000,000
SEK
|
355,000,000
SEK
|
1 673,4
SEK
|
3,536,000,000
SEK
|
3 834,8
SEK
|
1 275,6
SEK
|
— |
1 420,2
SEK
|
2,271,000,000
SEK
|
1 275,6
SEK
|
3 303,9
SEK
|
3 276,5
SEK
|
274,000,000
SEK
|
3,536,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||
| Profit (loss) |
2,576,000,000
SEK
|
— |
2,480,000,000
SEK
|
— | — |
96,000,000
SEK
|
— |
2,480,000,000
SEK
|
— | — | — | — | — | — |
4,865,000,000
SEK
|
4,700,000,000
SEK
|
165,000,000
SEK
|
— | — | — | — | — | — |
4,700,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income |
609,000,000
SEK
|
— |
615,000,000
SEK
|
659,000,000
SEK
|
— |
6,000,000
SEK
|
— |
44,000,000
SEK
|
— | — | — | — | — |
3,051,000,000
SEK
|
3,242,000,000
SEK
|
183,000,000
SEK
|
8,000,000
SEK
|
— | — | — | — | — | — |
3,234,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income |
1,967,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
8,107,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
1,646,000,000
SEK
|
— |
1,467,000,000
SEK
|
— | — |
179,000,000
SEK
|
— |
1,467,000,000
SEK
|
— | — | — | — | — | — |
1,365,000,000
SEK
|
1,273,000,000
SEK
|
92,000,000
SEK
|
— | — | — | — | — | — |
1,273,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
382,000,000
SEK
|
— |
382,000,000
SEK
|
— | — | — | — |
382,000,000
SEK
|
— | — | — | — | — | — |
1,078,000,000
SEK
|
1,078,000,000
SEK
|
— | — | — | — | — | — | — |
1,078,000,000
SEK
|
— | — | — | — | — | — | — |