Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 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 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 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 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||
| Equity | — |
3 222,3
SEK
|
2,982,000,000
SEK
|
3 194,6
SEK
|
— |
6 218,7
SEK
|
2,000,000
SEK
|
1,002,000,000
SEK
|
— | — | — |
2 924,9
SEK
|
382,000,000
SEK
|
3 194,6
SEK
|
1,002,000,000
SEK
|
— |
4,553,000,000
SEK
|
— |
5 802,6
SEK
|
— |
399,000,000
SEK
|
1,859,000,000
SEK
|
3 194,6
SEK
|
5 501,2
SEK
|
2 352,4
SEK
|
1,002,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||
| Profit (loss) |
41,000,000
SEK
|
— | — | — | — | — | — | — |
4,696,000,000
SEK
|
4,655,000,000
SEK
|
5,724,000,000
SEK
|
— | — | — | — |
5,657,000,000
SEK
|
— | — | — |
67,000,000
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
|
3,055,000,000
SEK
|
— | — | — | — |
5,693,000,000
SEK
|
— |
2,694,000,000
SEK
|
— |
56,000,000
SEK
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — | — | — |
881,000,000
SEK
|
881,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — | — | — |
28,000,000
SEK
|
28,000,000
SEK
|
22,000,000
SEK
|
— | — | — | — |
22,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |