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 |
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 |
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 |
2021-01-01 to 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 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity |
2 430
SEK
|
— | — | — |
262,000,000
SEK
|
1 624
SEK
|
177,000,000
SEK
|
83,000,000
SEK
|
— |
2 168
SEK
|
11,000,000
SEK
|
296,000,000
SEK
|
— | — | — |
1 205
SEK
|
295,000,000
SEK
|
— |
1 821
SEK
|
18,000,000
SEK
|
— | — |
1 688
SEK
|
132,000,000
SEK
|
7,000,000
SEK
|
177,000,000
SEK
|
— | — |
1 072
SEK
|
185,000,000
SEK
|
289,000,000
SEK
|
1 612
SEK
|
177,000,000
SEK
|
20,000,000
SEK
|
1 797
SEK
|
95,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
683,000,000
SEK
|
491,000,000
SEK
|
192,000,000
SEK
|
— | — | — | — | — | — | — | — |
491,000,000
SEK
|
— |
46,000,000
SEK
|
— | — |
174,000,000
SEK
|
— | — | — | — | — | — | — | — |
128,000,000
SEK
|
174,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Other comprehensive income | — |
117,000,000
SEK
|
45,000,000
SEK
|
12,000,000
SEK
|
— | — | — | — |
29,000,000
SEK
|
— | — | — |
105,000,000
SEK
|
89,000,000
SEK
|
1,000,000
SEK
|
— | — |
24,000,000
SEK
|
— | — |
14,000,000
SEK
|
77,000,000
SEK
|
— | — | — | — |
25,000,000
SEK
|
87,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — |
800,000,000
SEK
|
536,000,000
SEK
|
204,000,000
SEK
|
— | — | — | — |
29,000,000
SEK
|
— | — | — |
596,000,000
SEK
|
89,000,000
SEK
|
45,000,000
SEK
|
— | — |
198,000,000
SEK
|
— | — |
14,000,000
SEK
|
77,000,000
SEK
|
— | — | — | — |
153,000,000
SEK
|
261,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
88,000,000
SEK
|
88,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
88,000,000
SEK
|
— | — | — | — |
80,000,000
SEK
|
— | — | — | — | — | — | — | — |
80,000,000
SEK
|
80,000,000
SEK
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — |
103,000,000
SEK
|
29,000,000
SEK
|
74,000,000
SEK
|
— | — | — | — | — | — | — | — |
29,000,000
SEK
|
— |
8,000,000
SEK
|
— | — |
49,000,000
SEK
|
— | — | — | — | — | — | — | — |
57,000,000
SEK
|
49,000,000
SEK
|
— | — | — | — | — | — | — | — |