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 |
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) |
41,000,000
SEK
|
— |
4,696,000,000
SEK
|
4,655,000,000
SEK
|
5,657,000,000
SEK
|
5,724,000,000
SEK
|
67,000,000
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 | — | — |
105,000,000
SEK
|
105,000,000
SEK
|
48,000,000
SEK
|
48,000,000
SEK
|
— | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||
| Hedges of net investment in foreign operations [abstract] | ||||||||
| Other comprehensive income, before tax, hedges of net investments in foreign operations | — |
10,000,000
SEK
|
10,000,000
SEK
|
— | — |
92,000,000
SEK
|
— |
92,000,000
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 | — | — |
22,000,000
SEK
|
22,000,000
SEK
|
12,000,000
SEK
|
12,000,000
SEK
|
— | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||
| Income tax relating to hedges of net investments in foreign operations included in other comprehensive income | — |
2,000,000
SEK
|
2,000,000
SEK
|
— | — |
19,000,000
SEK
|
— |
19,000,000
SEK
|
| Other comprehensive income | — | — |
1,666,000,000
SEK
|
— | — |
2,669,000,000
SEK
|
— | — |
| Comprehensive income |
53,000,000
SEK
|
1,571,000,000
SEK
|
6,362,000,000
SEK
|
4,738,000,000
SEK
|
5,693,000,000
SEK
|
3,055,000,000
SEK
|
56,000,000
SEK
|
2,694,000,000
SEK
|
| Comprehensive income attributable to [abstract] | ||||||||
| Comprehensive income, attributable to owners of parent | — | — |
6,309,000,000
SEK
|
— | — |
2,999,000,000
SEK
|
— | — |
| Comprehensive income, attributable to non-controlling interests | — | — |
53,000,000
SEK
|
— | — |
56,000,000
SEK
|
— | — |