Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity |
9 943
SEK
|
— | — | — | — | — |
521,000,000
SEK
|
4,000,000
SEK
|
3 088
SEK
|
6 208
SEK
|
121,000,000
SEK
|
9 939
SEK
|
— | — | — |
5 311
SEK
|
75,000,000
SEK
|
— | — |
8 604
SEK
|
— |
8 594
SEK
|
10,000,000
SEK
|
— |
3 088
SEK
|
121,000,000
SEK
|
— | — |
4 445
SEK
|
10,000,000
SEK
|
7 548
SEK
|
121,000,000
SEK
|
105,000,000
SEK
|
3 088
SEK
|
7 557
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
SEK
|
–
SEK
|
1 652
SEK
|
1 651
SEK
|
1,000,000
SEK
|
— | — | — | — | — | — |
1 651
SEK
|
–
SEK
|
0
SEK
|
— | — |
–
SEK
|
1 492
SEK
|
— |
–
SEK
|
— | — |
–
SEK
|
— | — |
1 492
SEK
|
1 492
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — |
–
SEK
|
446,000,000
SEK
|
486,000,000
SEK
|
39,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — | — | — |
485,000,000
SEK
|
–
SEK
|
0
SEK
|
— | — |
180,000,000
SEK
|
184,000,000
SEK
|
— |
–
SEK
|
— | — |
–
SEK
|
— | — |
18 4
SEK
|
4,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income | — |
–
SEK
|
446,000,000
SEK
|
2 138
SEK
|
1 690
SEK
|
2,000,000
SEK
|
— | — | — | — | — | — |
2 136
SEK
|
–
SEK
|
0
SEK
|
— | — |
180,000,000
SEK
|
1 676
SEK
|
— |
–
SEK
|
— | — |
–
SEK
|
— | — |
1 676
SEK
|
1 496
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
SEK
|
–
SEK
|
880,000,000
SEK
|
876,000,000
SEK
|
4,000,000
SEK
|
— | — | — | — | — | — |
876,000,000
SEK
|
–
SEK
|
0
SEK
|
— | — |
–
SEK
|
782,000,000
SEK
|
— |
–
SEK
|
— | — |
–
SEK
|
— | — |
782,000,000
SEK
|
782,000,000
SEK
|
— | — | — | — | — | — | — |