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 |
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 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
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 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2019-12-31 to 2020-01-01 |
2019-12-31 to 2020-01-01 |
2019-12-31 to 2020-01-01 |
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 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity | — |
5 533
SEK
|
234,000,000
SEK
|
4 942
SEK
|
— | — |
10 993
SEK
|
10 992
SEK
|
1,000,000
SEK
|
— |
283,000,000
SEK
|
— | — | — |
282,000,000
SEK
|
10 005
SEK
|
4 864
SEK
|
113,000,000
SEK
|
4 971
SEK
|
10 005
SEK
|
1,000,000
SEK
|
— |
4 864
SEK
|
1,000,000
SEK
|
10 005
SEK
|
282,000,000
SEK
|
— |
4 971
SEK
|
113,000,000
SEK
|
— | — |
10 005
SEK
|
— | — | — | — | — | — |
9 367
SEK
|
4 824
SEK
|
1,000,000
SEK
|
322,000,000
SEK
|
9 369
SEK
|
3 941
SEK
|
280,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
0
SEK
|
— | — | — | — |
1 129
SEK
|
— | — | — | — | — | — |
1 130
SEK
|
1 129
SEK
|
— | — | — | — | — | — | — |
932,000,000
SEK
|
— | — | — | — |
933,000,000
SEK
|
— | — | — | — | — | — |
0
SEK
|
933,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
0
SEK
|
— | — | — |
347,000,000
SEK
|
452,000,000
SEK
|
— | — | — | — | — | — |
452,000,000
SEK
|
106,000,000
SEK
|
— | — | — | — | — | — | — |
413,000,000
SEK
|
— | — | — | — |
22,000,000
SEK
|
— | — |
435,000,000
SEK
|
— | — | — |
0
SEK
|
413,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
0
SEK
|
— | — | — |
347,000,000
SEK
|
1 581
SEK
|
— | — | — |
—
SEK
|
— |
—
SEK
|
1 582
SEK
|
1 235
SEK
|
— | — | — | — | — | — | — |
519,000,000
SEK
|
— | — | — | — |
955,000,000
SEK
|
— | — |
435,000,000
SEK
|
—
SEK
|
— |
—
SEK
|
0
SEK
|
520,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
0
SEK
|
— | — | — | — |
566,000,000
SEK
|
— | — | — | — | — | — |
566,000,000
SEK
|
566,000,000
SEK
|
— | — | — | — | — | — | — |
0
SEK
|
— | — | — | — | — | — | — | — | — | — | — |
0
SEK
|
—
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
31,000,000
SEK
|
31,000,000
SEK
|
31,000,000
SEK
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,000,000
SEK
|
— | — | — | — | — | — | — | — |
9,000,000
SEK
|
— | — | — |
9,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |