Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||
| Equity | — |
83 288
SEK
|
13 813
SEK
|
— | — |
147 165
SEK
|
99 581
SEK
|
47 584
SEK
|
2 480
SEK
|
— | — | — |
72 728
SEK
|
43 471
SEK
|
85 252
SEK
|
2 480
SEK
|
— |
10 044
SEK
|
— |
128 723
SEK
|
— | — |
81 196
SEK
|
44 214
SEK
|
10 188
SEK
|
125 410
SEK
|
68 528
SEK
|
2 480
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||
| Profit (loss) |
3 556
SEK
|
— | — | — |
11 367
SEK
|
— | — | — | — |
14 924
SEK
|
11 367
SEK
|
4 108
SEK
|
— | — | — | — |
3 591
SEK
|
— | — | — |
517,000,000
SEK
|
3 591
SEK
|
— | — | — | — | — | — |
| Other comprehensive income |
2 113
SEK
|
— | — |
3 769
SEK
|
3 830
SEK
|
— | — | — | — |
5 943
SEK
|
61,000,000
SEK
|
515,000,000
SEK
|
— | — | — | — |
6,000,000
SEK
|
— |
144,000,000
SEK
|
— |
653,000,000
SEK
|
138,000,000
SEK
|
— | — | — | — | — | — |
| Comprehensive income |
5 669
SEK
|
— | — |
3 769
SEK
|
15 197
SEK
|
— | — | — | — |
20 866
SEK
|
11 428
SEK
|
4 623
SEK
|
— | — | — | — |
3 597
SEK
|
— |
144,000,000
SEK
|
— |
1 169
SEK
|
3 453
SEK
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners |
1 417
SEK
|
— | — | — |
868,000,000
SEK
|
— | — | — | — |
2 285
SEK
|
868,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity |
148,000,000
SEK
|
— | — | — |
4,000,000
SEK
|
— | — | — | — |
153,000,000
SEK
|
4,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — |
263,000,000
SEK
|
— | — | — |
261,000,000
SEK
|
263,000,000
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
570,000,000
SEK
|
— | — | — |
570,000,000
SEK
|
570,000,000
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
8,000,000
SEK
|
— | — | — |
4,000,000
SEK
|
— | — | — | — |
12,000,000
SEK
|
4,000,000
SEK
|
2,000,000
SEK
|
— | — | — | — |
1,000,000
SEK
|
— | — | — |
2,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — | — | — |
| Increase (decrease) in equity | — | — | — | — | — | — | — | — | — | — | — |
500,000,000
SEK
|
— | — | — | — |
231,000,000
SEK
|
— | — | — |
269,000,000
SEK
|
231,000,000
SEK
|
— | — | — | — | — | — |