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 |
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 2022-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 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 |
As at 2021-12-31 |
2021-01-01 to 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 |
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 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity |
33 508
SEK
|
— | — | — | — |
488,000,000
SEK
|
107,000,000
SEK
|
30 228
SEK
|
500,000,000
SEK
|
2 091
SEK
|
33 020
SEK
|
— |
94,000,000
SEK
|
— | — |
25 137
SEK
|
— | — |
25 785
SEK
|
0
SEK
|
— |
25 729
SEK
|
106,000,000
SEK
|
14,000,000
SEK
|
500,000,000
SEK
|
56,000,000
SEK
|
— | — |
24 220
SEK
|
46,000,000
SEK
|
0
SEK
|
23 693
SEK
|
500,000,000
SEK
|
1 107
SEK
|
80,000,000
SEK
|
23 739
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
8 411
SEK
|
8 397
SEK
|
14,000,000
SEK
|
— | — | — | — | — | — | — |
8 397
SEK
|
— | — |
11,000,000
SEK
|
— | — |
7 058
SEK
|
— | — | — | — | — | — | — | — |
7 069
SEK
|
7 058
SEK
|
— | — | — | — | — | — | — | — |
| Other comprehensive income | — |
2 754
SEK
|
548,000,000
SEK
|
7,000,000
SEK
|
94,000,000
SEK
|
— | — | — | — | — | — |
2 747
SEK
|
— |
2 105
SEK
|
6,000,000
SEK
|
— |
0
SEK
|
1 649
SEK
|
— | — |
1 093
SEK
|
— | — | — | — | — |
1 655
SEK
|
556,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — |
11 165
SEK
|
8 945
SEK
|
21,000,000
SEK
|
94,000,000
SEK
|
— | — | — | — | — | — |
11 144
SEK
|
— |
2 105
SEK
|
17,000,000
SEK
|
— |
0
SEK
|
8 707
SEK
|
— | — |
1 093
SEK
|
— | — | — | — | — |
8 724
SEK
|
7 614
SEK
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
3 621
SEK
|
3 619
SEK
|
2,000,000
SEK
|
— | — | — | — | — | — | — |
3 619
SEK
|
— | — |
7,000,000
SEK
|
— | — |
3 016
SEK
|
— | — | — | — | — | — | — | — |
3 023
SEK
|
3 016
SEK
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3 619
SEK
|
— | — | — | — | — | — | — | — |
3 619
SEK
|
3 619
SEK
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — |
30,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
22,000,000
SEK
|
— | — | — | — | — | — | — | — |