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 |
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 |
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 |
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 |
7 669,8
SEK
|
— | — | — | — |
5 6,0
SEK
|
9,192,000,000
SEK
|
54,000,000
SEK
|
1,251,000,000
SEK
|
7 613,8
SEK
|
6 564,2
SEK
|
— | — | — | — |
394, 7
SEK
|
4 790,6
SEK
|
— |
5 256,3
SEK
|
— |
5 211,9
SEK
|
— |
229,000,000
SEK
|
37,000,000
SEK
|
444,000,000
SEK
|
— | — | — |
1,113,000,000
SEK
|
358,000,000
SEK
|
2 667,4
SEK
|
2 787,2
SEK
|
32,000,000
SEK
|
53,000,000
SEK
|
2 823,0
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
457,000,000
SEK
|
341,000,000
SEK
|
117,000,000
SEK
|
— | — | — | — | — | — |
341,000,000
SEK
|
— | — |
99,000,000
SEK
|
— | — |
4,809,000,000
SEK
|
— | — | — | — | — | — | — | — |
4,908,000,000
SEK
|
4,809,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — |
1,064,000,000
SEK
|
— |
42,000,000
SEK
|
— | — | — | — | — | — |
102, 2
SEK
|
102, 2
SEK
|
— |
7,000,000
SEK
|
— | — |
176,000,000
SEK
|
— |
176,000,000
SEK
|
— | — | — | — | — | — |
183,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — |
-
SEK
|
1,521,000,000
SEK
|
341,000,000
SEK
|
159,000,000
SEK
|
— | — | — | — | — | — |
13 6,2
SEK
|
1,022,000,000
SEK
|
-
SEK
|
106,000,000
SEK
|
— | — |
4,985,000,000
SEK
|
— |
176,000,000
SEK
|
— |
-
SEK
|
— | — | — |
-
SEK
|
5,091,000,000
SEK
|
4,809,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — |
225,000,000
SEK
|
225,000,000
SEK
|
— | — | — | — | — | — | — |
225,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
-
SEK
|
— | — | — | — | — | — | — | — |
-
SEK
|
— | — | — | — | — | — | — | — |