Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2020-01-01 to 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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity | — |
25 137
SEK
|
— | — |
25 785
SEK
|
0
SEK
|
— |
25 729
SEK
|
106,000,000
SEK
|
56,000,000
SEK
|
14,000,000
SEK
|
500,000,000
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
|
— | — | — |
22 761
SEK
|
52,000,000
SEK
|
730,000,000
SEK
|
22 813
SEK
|
58,000,000
SEK
|
21 473
SEK
|
0
SEK
|
500,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||
| Profit (loss) |
11,000,000
SEK
|
— | — |
7 058
SEK
|
— | — | — | — | — | — | — | — |
7 069
SEK
|
7 058
SEK
|
5 410
SEK
|
— | — | — | — | — |
5 399
SEK
|
— | — | — | — | — |
11,000,000
SEK
|
5 399
SEK
|
— | — | — | — | — | — | — | — |
| Other comprehensive income |
6,000,000
SEK
|
— |
0
SEK
|
1 649
SEK
|
— | — |
1 093
SEK
|
— | — | — | — | — |
1 655
SEK
|
556,000,000
SEK
|
1 960
SEK
|
— | — | — | — | — |
115,000,000
SEK
|
0
SEK
|
— | — | — |
1 837
SEK
|
8,000,000
SEK
|
1 952
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
17,000,000
SEK
|
— |
0
SEK
|
8 707
SEK
|
— | — |
1 093
SEK
|
— | — | — | — | — |
8 724
SEK
|
7 614
SEK
|
3 450
SEK
|
— | — | — | — | — |
5 284
SEK
|
0
SEK
|
— | — | — |
1 837
SEK
|
3,000,000
SEK
|
3 447
SEK
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
7,000,000
SEK
|
— | — |
3 016
SEK
|
— | — | — | — | — | — | — | — |
3 023
SEK
|
3 016
SEK
|
2 901
SEK
|
— | — | — | — | — |
2 892
SEK
|
— | — | — | — | — |
9,000,000
SEK
|
2 892
SEK
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — |
3 619
SEK
|
— | — | — | — | — | — | — | — |
3 619
SEK
|
3 619
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — | — | — | — | — | — | — | — |
22,000,000
SEK
|
25,000,000
SEK
|
— | — | — | — | — |
25,000,000
SEK
|
— | — | — | — | — | — |
25,000,000
SEK
|
— | — | — | — | — | — | — | — |