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 |
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 comprehensive income [abstract] | ||||||||||||||
| Profit (loss) | — | — | — | — | — |
3 000
SEK
|
— | — | — |
3 273
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 | — | — | — | — | — |
5,000,000
SEK
|
— | — | — |
13,000,000
SEK
|
— | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||
| Cash flow hedges [abstract] | ||||||||||||||
| Gains (losses) on cash flow hedges, before tax | — | — | — | — | — |
22,000,000
SEK
|
— | — | — |
16,000,000
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 | — | — | — | — | — |
10,000,000
SEK
|
— | — | — |
1,000,000
SEK
|
— | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — | — | — |
17,000,000
SEK
|
— | — | — |
21,000,000
SEK
|
— | — | — | — |
| Other comprehensive income | — | — | — | — | — |
1 580
SEK
|
— | — | — |
2 327
SEK
|
— | — | — | — |
| Comprehensive income |
37,000,000
SEK
|
–
SEK
|
1 568
SEK
|
–
SEK
|
4 543
SEK
|
4 580
SEK
|
2 974
SEK
|
3 225
SEK
|
–
SEK
|
946,000,000
SEK
|
9,000,000
SEK
|
–
SEK
|
936,000,000
SEK
|
2 28 8
SEK
|
| Comprehensive income attributable to [abstract] | ||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — |
4 543
SEK
|
— | — | — |
936,000,000
SEK
|
— | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — |
37,000,000
SEK
|
— | — | — |
9,000,000
SEK
|
— | — | — | — |