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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||
| Profit (loss) | — | — | — |
1 726
SEK
|
1 726
SEK
|
451,000,000
SEK
|
— |
451,000,000
SEK
|
— | — |
| Other comprehensive income [abstract] | ||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — | — |
110,000,000
SEK
|
— | — | — |
47,000,000
SEK
|
— | — |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | — | — | — |
31,000,000
SEK
|
— | — | — |
32,000,000
SEK
|
— | — |
| Other comprehensive income | — | — | — |
1 869
SEK
|
— | — | — |
1 613
SEK
|
— | — |
| Comprehensive income |
1 790
SEK
|
–
SEK
|
–
SEK
|
3 595
SEK
|
1 805
SEK
|
437,000,000
SEK
|
–
SEK
|
1 162
SEK
|
–
SEK
|
1 599
SEK
|
| Comprehensive income attributable to [abstract] | ||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — |
3 595
SEK
|
— | — | — |
1 162
SEK
|
— | — |