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 |
3 870,3
SEK
|
— | — | — | — |
5,322,000,000
SEK
|
355,000,000
SEK
|
1 673,4
SEK
|
3,536,000,000
SEK
|
3 834,8
SEK
|
1 275,6
SEK
|
— | — |
1 420,2
SEK
|
2,271,000,000
SEK
|
1 275,6
SEK
|
— | — |
3 303,9
SEK
|
3 276,5
SEK
|
274,000,000
SEK
|
3,536,000,000
SEK
|
— | — |
1 201,2
SEK
|
209,000,000
SEK
|
1 275,6
SEK
|
2 887,0
SEK
|
3,536,000,000
SEK
|
566,000,000
SEK
|
2 907,8
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
4,865,000,000
SEK
|
4,700,000,000
SEK
|
165,000,000
SEK
|
— | — | — | — | — | — |
4,700,000,000
SEK
|
87,000,000
SEK
|
— | — | — | — |
3,223,000,000
SEK
|
— | — | — | — |
3,311,000,000
SEK
|
3,223,000,000
SEK
|
— | — | — | — | — | — | — |
| Other comprehensive income | — |
3,051,000,000
SEK
|
3,242,000,000
SEK
|
183,000,000
SEK
|
8,000,000
SEK
|
— | — | — | — | — | — |
3,234,000,000
SEK
|
3,000,000
SEK
|
— | — | — |
1,705,000,000
SEK
|
1,768,000,000
SEK
|
— | — | — | — |
1,771,000,000
SEK
|
63,000,000
SEK
|
— | — | — | — | — | — | — |
| Comprehensive income | — | — |
8,107,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,082,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — |
1,365,000,000
SEK
|
1,273,000,000
SEK
|
92,000,000
SEK
|
— | — | — | — | — | — |
1,273,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — |
1,078,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
25,000,000
SEK
|
— | — | — | — |
1,096,000,000
SEK
|
— | — | — | — |
1,121,000,000
SEK
|
1,096,000,000
SEK
|
— | — | — | — | — | — | — |