Statement Of Comprehensive Income [Abstract]
| Concept |
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 |
|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||
| Profit (loss) | — |
470,000,000
SEK
|
470,000,000
SEK
|
299,000,000
SEK
|
299,000,000
SEK
|
— |
| Other comprehensive income [abstract] | ||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] | ||||||
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans |
1,000,000
SEK
|
1,000,000
SEK
|
— | — |
1,000,000
SEK
|
1,000,000
SEK
|
| Other comprehensive income | — |
60,000,000
SEK
|
— | — |
131,000,000
SEK
|
— |
| Comprehensive income |
60,000,000
SEK
|
530,000,000
SEK
|
470,000,000
SEK
|
299,000,000
SEK
|
16 8
SEK
|
13 1
SEK
|
| Comprehensive income attributable to [abstract] | ||||||
| Comprehensive income, attributable to owners of parent | — |
530,000,000
SEK
|
— | — |
16 8
SEK
|
— |