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 |
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 |
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 |
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 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 |
2 502,6
SEK
|
— | — | — | — | — |
394,000,000
SEK
|
0
SEK
|
2,280,000,000
SEK
|
56,000,000
SEK
|
2 502,6
SEK
|
2 229,6
SEK
|
— | — | — |
346,000,000
SEK
|
36,000,000
SEK
|
2 201,9
SEK
|
— | — |
2 297,7
SEK
|
2 176,5
SEK
|
1,211,000,000
SEK
|
— |
56,000,000
SEK
|
— | — | — |
1,081,000,000
SEK
|
-
SEK
|
2 010,3
SEK
|
1 908,1
SEK
|
53,000,000
SEK
|
6,000,000
SEK
|
1 908,1
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
-
SEK
|
-
SEK
|
1,861,000,000
SEK
|
1,861,000,000
SEK
|
-
SEK
|
— | — | — | — | — | — |
1,861,000,000
SEK
|
-
SEK
|
65,000,000
SEK
|
— | — | — |
-
SEK
|
1,887,000,000
SEK
|
— | — | — |
-
SEK
|
— |
-
SEK
|
1,952,000,000
SEK
|
1,887,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — |
-
SEK
|
357,000,000
SEK
|
357,000,000
SEK
|
-
SEK
|
-
SEK
|
— | — | — | — | — | — |
357,000,000
SEK
|
-
SEK
|
1,000,000
SEK
|
— | — | — |
30,000,000
SEK
|
30,000,000
SEK
|
— | — | — |
-
SEK
|
— |
-
SEK
|
31,000,000
SEK
|
-
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income | — |
-
SEK
|
357,000,000
SEK
|
2,218,000,000
SEK
|
1,861,000,000
SEK
|
-
SEK
|
— | — | — | — | — | — |
2,218,000,000
SEK
|
-
SEK
|
66,000,000
SEK
|
— | — | — |
30,000,000
SEK
|
1,918,000,000
SEK
|
— | — | — |
-
SEK
|
— |
-
SEK
|
1,983,000,000
SEK
|
1,887,000,000
SEK
|
— | — | — | — | — | — | — |
| Issue of equity | — |
0
SEK
|
-
SEK
|
0
SEK
|
0
SEK
|
-
SEK
|
— | — | — | — | — | — |
0
SEK
|
-
SEK
|
-
SEK
|
— | — | — |
-
SEK
|
1,375,000,000
SEK
|
— | — | — |
2,000,000
SEK
|
— |
1,373,000,000
SEK
|
1,375,000,000
SEK
|
1,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
-
SEK
|
-
SEK
|
277,000,000
SEK
|
-
SEK
|
-
SEK
|
— | — | — | — | — | — |
277,000,000
SEK
|
277,000,000
SEK
|
-
SEK
|
— | — | — |
-
SEK
|
543,000,000
SEK
|
— | — | — |
-
SEK
|
— |
543,000,000
SEK
|
543,000,000
SEK
|
-
SEK
|
— | — | — | — | — | — | — |