Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
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 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 |
1 924
SEK
|
— |
2,275,000,000
SEK
|
4 941
SEK
|
473,000,000
SEK
|
1,106,000,000
SEK
|
— |
79,000,000
SEK
|
30,000,000
SEK
|
— | — | — |
2 128
SEK
|
443,000,000
SEK
|
2 275
SEK
|
1,106,000,000
SEK
|
30,000,000
SEK
|
— | — |
62,000,000
SEK
|
5 158
SEK
|
— |
4 898
SEK
|
30,000,000
SEK
|
690,000,000
SEK
|
181,000,000
SEK
|
439,000,000
SEK
|
2 275
SEK
|
2 161
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — | — | — |
117,000,000
SEK
|
117,000,000
SEK
|
41,000,000
SEK
|
— | — | — | — | — |
41,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
30,000,000
SEK
|
— | — | — | — |
17,000,000
SEK
|
— | — |
10,000,000
SEK
|
3,000,000
SEK
|
128,000,000
SEK
|
— | — | — | — | — |
5,000,000
SEK
|
4,000,000
SEK
|
— | — |
119,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income | — |
30,000,000
SEK
|
— | — | — | — |
17,000,000
SEK
|
— | — |
127,000,000
SEK
|
114,000,000
SEK
|
87,000,000
SEK
|
— | — | — | — | — |
36,000,000
SEK
|
4,000,000
SEK
|
— | — |
119,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — | — | — | — | — | — | — | — | — | — |
8,000,000
SEK
|
— | — | — | — | — |
8,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — | — | — | — |
0
SEK
|
0
SEK
|
1,000,000
SEK
|
— | — | — | — | — |
1,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — |