Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||
| Statement of changes in equity [line items] | ||||||||||||
| Dividends recognised as distributions to owners of parent | — |
8 179
SEK
|
— | — |
8 179
SEK
|
10 020
SEK
|
— | — | — | — |
10 020
SEK
|
— |
| Dividends recognised as distributions to non-controlling interests |
178,000,000
SEK
|
— | — | — | — | — | — | — |
192,000,000
SEK
|
— | — | — |
| Increase (decrease) through transactions with owners, equity |
1 513
SEK
|
1 968
SEK
|
8,000,000
SEK
|
455,000,000
SEK
|
1 960
SEK
|
7 315
SEK
|
— |
11 151
SEK
|
192,000,000
SEK
|
3 099
SEK
|
10 959
SEK
|
545,000,000
SEK
|
| Purchase of treasury shares | — |
21,000,000
SEK
|
21,000,000
SEK
|
21,000,000
SEK
|
— | — | — |
956,000,000
SEK
|
— | — |
956,000,000
SEK
|
956,000,000
SEK
|
| Cancellation of treasury shares | — | — | — | — | — | — |
395,000,000
SEK
|
— | — | — | — |
395,000,000
SEK
|