Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
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 |
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 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 | — | — |
12 454
SEK
|
— | — |
6 448
SEK
|
— |
773,000,000
SEK
|
— |
1,000,000
SEK
|
— |
283,000,000
SEK
|
12 454
SEK
|
4 949
SEK
|
12 178
SEK
|
— | — | — | — | — |
858,000,000
SEK
|
— |
2,000,000
SEK
|
6 085
SEK
|
283,000,000
SEK
|
12 176
SEK
|
4 949
SEK
|
— |
5 533
SEK
|
234,000,000
SEK
|
4 942
SEK
|
10 993
SEK
|
10 992
SEK
|
1,000,000
SEK
|
283,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
1 100
SEK
|
— | — |
1 100
SEK
|
— | — |
0
SEK
|
— |
1 100
SEK
|
— | — | — | — | — | — | — | — |
974,000,000
SEK
|
974,000,000
SEK
|
0
SEK
|
— | — | — | — | — | — | — |
974,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income |
201,000,000
SEK
|
— | — |
201,000,000
SEK
|
85,000,000
SEK
|
— |
0
SEK
|
— |
116,000,000
SEK
|
— | — | — | — | — | — | — |
624,000,000
SEK
|
826,000,000
SEK
|
202,000,000
SEK
|
0
SEK
|
— | — | — | — | — | — | — |
825,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income |
899,000,000
SEK
|
—
SEK
|
— |
899,000,000
SEK
|
85,000,000
SEK
|
— |
0
SEK
|
— |
984,000,000
SEK
|
— |
—
SEK
|
— | — | — | — |
—
SEK
|
624,000,000
SEK
|
1 800
SEK
|
1 176
SEK
|
0
SEK
|
— |
—
SEK
|
— | — | — | — | — |
1 800
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
623,000,000
SEK
|
— | — |
623,000,000
SEK
|
— | — |
0
SEK
|
— |
623,000,000
SEK
|
— | — | — | — | — | — | — | — |
623,000,000
SEK
|
623,000,000
SEK
|
0
SEK
|
— | — | — | — | — | — | — |
623,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
—
SEK
|
— | — |
1,000,000
SEK
|
— | — |
1,000,000
SEK
|
— |
1,000,000
SEK
|
— | — | — | — | — | — | — | — |
—
SEK
|
1,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — | — | — | — |
1,000,000
SEK
|
— | — | — | — | — | — | — |