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 |
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 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 | — |
6 6 5 74
SEK
|
— | — |
88 567
SEK
|
117,000,000
SEK
|
— |
77 6 06
SEK
|
1 0 729
SEK
|
10 9 61
SEK
|
1,000,000
SEK
|
187,000,000
SEK
|
— | — | — |
4 8 06 8
SEK
|
9 6 76
SEK
|
15,000,000
SEK
|
58 2 09
SEK
|
187,000,000
SEK
|
— | — |
7 8 9
SEK
|
1 0 729
SEK
|
— |
6 7 885
SEK
|
— | — | — | — |
49 01 1
SEK
|
9 7 14
SEK
|
432,000,000
SEK
|
7 80 6
SEK
|
58 72 5
SEK
|
41 4 32
SEK
|
26,000,000
SEK
|
180,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
1 076
SEK
|
— | — |
18 5 08
SEK
|
— | — | — | — | — | — | — | — |
19 5 84
SEK
|
18 50 8
SEK
|
7 275
SEK
|
— | — | — | — | — |
6 641
SEK
|
— | — | — | — | — | — |
634,000,000
SEK
|
— |
6 641
SEK
|
— | — | — | — | — | — | — | — |
| Other comprehensive income |
271,000,000
SEK
|
— |
103,000,000
SEK
|
890,000,000
SEK
|
— | — |
788,000,000
SEK
|
— | — | — | — | — |
1 162
SEK
|
— |
7 6 3
SEK
|
— | — | — | — | — | — |
11,000,000
SEK
|
— | — | — | — |
357,000,000
SEK
|
394,000,000
SEK
|
— |
368,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
1 3 48
SEK
|
— |
103,000,000
SEK
|
19 3 99
SEK
|
— | — |
788,000,000
SEK
|
— | — | — | — | — |
2 0 74 6
SEK
|
1 8 508
SEK
|
6 51 3
SEK
|
— | — | — | — | — |
6 641
SEK
|
11,000,000
SEK
|
— | — | — | — |
357,000,000
SEK
|
240,000,000
SEK
|
— |
6 273
SEK
|
— | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2 93 0
SEK
|
— | — | — | — | — | — | — | — | — |
7,000,000
SEK
|
— | — | — |
2 923
SEK
|
2 9 30
SEK
|
— | — | — | — | — | — | — | — |
| Increase through other contributions by owners, equity |
6,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
6,000,000
SEK
|
— |
17,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — |
17,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
23,000,000
SEK
|
— | — |
2,000,000
SEK
|
— | — | — | — | — | — | — | — |
25,000,000
SEK
|
2,000,000
SEK
|
301,000,000
SEK
|
— | — | — | — | — |
5,000,000
SEK
|
— | — | — | — | — | — |
29 6
SEK
|
— |
5,000,000
SEK
|
— | — | — | — | — | — | — | — |