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 |
2021-01-01 to 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 |
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 |
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 |
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 |
2020-01-01 to 2020-12-31 |
As at 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 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity | — |
49 841
SEK
|
— | — |
94 978
SEK
|
— | — | — |
8 452
SEK
|
90 418
SEK
|
1 244
SEK
|
31 655
SEK
|
— |
1 653
SEK
|
61,000,000
SEK
|
4 560
SEK
|
— | — | — |
40 323
SEK
|
11 006
SEK
|
59 412
SEK
|
51,000,000
SEK
|
— | — | — |
8 452
SEK
|
1 379
SEK
|
11 497
SEK
|
— |
70 418
SEK
|
— | — | — | — |
468,000,000
SEK
|
53 883
SEK
|
9 765
SEK
|
1 023
SEK
|
11 497
SEK
|
63 648
SEK
|
37 170
SEK
|
4 310
SEK
|
8 452
SEK
|
51,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
1 631
SEK
|
— |
—
SEK
|
12 546
SEK
|
— |
—
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
14 177
SEK
|
12 546
SEK
|
7 788
SEK
|
— | — | — | — |
5 834
SEK
|
—
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
—
SEK
|
1 954
SEK
|
—
SEK
|
5 834
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
1 001
SEK
|
— |
1 712
SEK
|
3 774
SEK
|
— |
—
SEK
|
—
SEK
|
3 032
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
4 775
SEK
|
2 454
SEK
|
887,000,000
SEK
|
— | — | — | — |
780,000,000
SEK
|
4 778
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
2 402
SEK
|
709,000,000
SEK
|
—
SEK
|
1 596
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
2 632
SEK
|
— |
1 712
SEK
|
16 320
SEK
|
— |
—
SEK
|
—
SEK
|
3 032
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
18 952
SEK
|
15 000
SEK
|
8 675
SEK
|
— | — | — | — |
5 054
SEK
|
4 778
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
2 402
SEK
|
1 245
SEK
|
—
SEK
|
7 430
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
9 708
SEK
|
— |
—
SEK
|
5 709
SEK
|
— | — |
—
SEK
|
—
SEK
|
— | — | — | — | — | — | — | — |
15 417
SEK
|
5 709
SEK
|
4,000,000
SEK
|
— | — | — | — |
—
SEK
|
—
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
—
SEK
|
4,000,000
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Increase through other contributions by owners, equity |
1 267
SEK
|
— |
—
SEK
|
—
SEK
|
— |
—
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
1 267
SEK
|
—
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Decrease through other distributions to owners, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 901
SEK
|
— | — | — | — |
1 901
SEK
|
—
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
—
SEK
|
—
SEK
|
—
SEK
|
1 901
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
409,000,000
SEK
|
— |
—
SEK
|
409,000,000
SEK
|
— |
—
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
—
SEK
|
409,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |