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 |
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 |
As at 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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||
| Equity | — |
798,000,000
SEK
|
— |
1 751
SEK
|
— |
1 747
SEK
|
946,000,000
SEK
|
4,000,000
SEK
|
1,000,000
SEK
|
4,000,000
SEK
|
— | — |
6 42
SEK
|
— |
3,000,000
SEK
|
1 590
SEK
|
4,000,000
SEK
|
— |
2,000,000
SEK
|
946,000,000
SEK
|
— |
1 593
SEK
|
— | — | — | — |
56 9
SEK
|
3,000,000
SEK
|
0
SEK
|
572,000,000
SEK
|
83,000,000
SEK
|
483,000,000
SEK
|
3,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||
| Profit (loss) |
0
SEK
|
— |
241,000,000
SEK
|
— | — | — | — | — | — | — |
241,000,000
SEK
|
241,000,000
SEK
|
— |
234,000,000
SEK
|
— | — | — |
234,000,000
SEK
|
— | — | — | — | — |
0
SEK
|
— |
234,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income |
0
SEK
|
— |
242,000,000
SEK
|
— |
1,000,000
SEK
|
— | — | — | — | — |
242,000,000
SEK
|
241,000,000
SEK
|
— |
232,000,000
SEK
|
— | — | — |
23 4
SEK
|
— | — | — | — |
2,000,000
SEK
|
0
SEK
|
— |
2 32
SEK
|
— | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — |
9 01
SEK
|
— | — | — | — | — | — |
1,000,000
SEK
|
— | — |
–
SEK
|
900,000,000
SEK
|
9 01
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
SEK
|
— |
107,000,000
SEK
|
— | — | — | — | — | — | — |
107,000,000
SEK
|
10 7
SEK
|
— |
75,000,000
SEK
|
— | — | — |
75,000,000
SEK
|
— | — | — | — | — |
–
SEK
|
— |
75,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity |
–
SEK
|
— |
61,000,000
SEK
|
— | — | — | — | — | — | — |
61,000,000
SEK
|
61,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
SEK
|
— |
83,000,000
SEK
|
— | — | — | — | — | — | — |
83,000,000
SEK
|
83,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |