Statement Of Changes In Equity [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
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 |
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 |
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 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||
| Equity |
6 882,2
SEK
|
— | — | — | — |
43,000,000
SEK
|
1,000,000
SEK
|
3 583,2
SEK
|
1,002,000,000
SEK
|
6 882,3
SEK
|
3 194,6
SEK
|
— | — |
3 222,3
SEK
|
2,982,000,000
SEK
|
3 194,6
SEK
|
— | — |
6 218,7
SEK
|
6 218,9
SEK
|
2,000,000
SEK
|
1,002,000,000
SEK
|
— | — |
2 924,9
SEK
|
382,000,000
SEK
|
3 194,6
SEK
|
5 764,4
SEK
|
1,002,000,000
SEK
|
4,553,000,000
SEK
|
5 802,6
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
5,764,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,696,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Other comprehensive income | — | — |
3,108,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,666,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — |
3,025,000,000
SEK
|
8,872,000,000
SEK
|
5,846,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — | — | — |
8,871,000,000
SEK
|
53,000,000
SEK
|
— | — | — |
1,571,000,000
SEK
|
6,309,000,000
SEK
|
— | — | — | — |
6,362,000,000
SEK
|
4,738,000,000
SEK
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — |
2,290,000,000
SEK
|
2,290,000,000
SEK
|
— | — | — | — | — | — | — |
2,290,000,000
SEK
|
— | — | — | — | — |
881,000,000
SEK
|
— | — | — | — |
881,000,000
SEK
|
881,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — |
53,000,000
SEK
|
53,000,000
SEK
|
— | — | — | — | — | — | — |
53,000,000
SEK
|
— | — | — | — | — |
28,000,000
SEK
|
— | — | — | — |
28,000,000
SEK
|
28,000,000
SEK
|
— | — | — | — | — | — | — |