Statement Of Changes In Equity [Abstract]
| Concept |
2020-12-31 to 2021-12-31 |
2020-12-31 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2020-12-31 to 2021-12-31 |
2020-12-31 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2020-12-31 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2019-12-31 to 2020-12-31 |
2019-12-31 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2019-12-31 to 2020-12-31 |
2019-12-31 to 2020-12-31 |
2019-12-31 to 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||
| Equity | — | — |
1,063,000,000
SEK
|
143,079,000,000
SEK
|
— | — |
26,594,000,000
SEK
|
114,334,000,000
SEK
|
1,088,000,000
SEK
|
— | — | — |
1,063,000,000
SEK
|
1,088,000,000
SEK
|
— | — |
110,385,000,000
SEK
|
8,440,000,000
SEK
|
— | — | — |
120,976,000,000
SEK
|
1,063,000,000
SEK
|
112,528,000,000
SEK
|
80,540,000,000
SEK
|
29,837,000,000
SEK
|
1,088,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||
| Profit (loss) |
–
SEK
|
–
SEK
|
— | — |
–
SEK
|
26,594,000,000
SEK
|
— | — | — |
26,594,000,000
SEK
|
26,594,000,000
SEK
|
8,440,000,000
SEK
|
— | — |
–
SEK
|
8,440,000,000
SEK
|
— | — |
8,440,000,000
SEK
|
–
SEK
|
–
SEK
|
— | — | — | — | — | — |
| Comprehensive income |
–
SEK
|
–
SEK
|
— | — |
18,000,000
SEK
|
26,594,000,000
SEK
|
— | — | — |
26,612,000,000
SEK
|
26,612,000,000
SEK
|
8,440,000,000
SEK
|
— | — |
–
SEK
|
8,440,000,000
SEK
|
— | — |
8,440,000,000
SEK
|
0
SEK
|
–
SEK
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
SEK
|
–
SEK
|
— | — |
3,590,000,000
SEK
|
–
SEK
|
— | — | — |
3,590,000,000
SEK
|
— | — | — | — |
–
SEK
|
–
SEK
|
— | — |
–
SEK
|
–
SEK
|
–
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
SEK
|
–
SEK
|
— | — |
3,000,000
SEK
|
–
SEK
|
— | — | — |
3,000,000
SEK
|
— | — | — | — |
–
SEK
|
8,000,000
SEK
|
— | — |
–
SEK
|
8,000,000
SEK
|
–
SEK
|
— | — | — | — | — | — |