Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 2021-12-31 |
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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 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 |
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 | — |
49,841,000,000
SEK
|
— | — |
94,978,000,000
SEK
|
— | — | — |
8,452,000,000
SEK
|
90,418,000,000
SEK
|
1,244,000,000
SEK
|
31,655,000,000
SEK
|
— |
1,653,000,000
SEK
|
61,000,000
SEK
|
4,560,000,000
SEK
|
— | — | — |
40,323,000,000
SEK
|
11,006,000,000
SEK
|
59,412,000,000
SEK
|
51,000,000
SEK
|
— | — | — |
8,452,000,000
SEK
|
1,379,000,000
SEK
|
11,497,000,000
SEK
|
— |
70,418,000,000
SEK
|
— | — | — | — |
468,000,000
SEK
|
53,883,000,000
SEK
|
9,765,000,000
SEK
|
1,023,000,000
SEK
|
11,497,000,000
SEK
|
63,648,000,000
SEK
|
37,170,000,000
SEK
|
4,310,000,000
SEK
|
8,452,000,000
SEK
|
51,000,000
SEK
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
1,631,000,000
SEK
|
— |
—
SEK
|
12,546,000,000
SEK
|
— |
—
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
14,177,000,000
SEK
|
12,546,000,000
SEK
|
7,788,000,000
SEK
|
— | — | — | — |
5,834,000,000
SEK
|
—
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
—
SEK
|
1,954,000,000
SEK
|
—
SEK
|
5,834,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
1,001,000,000
SEK
|
— |
1,712,000,000
SEK
|
3,774,000,000
SEK
|
— |
—
SEK
|
—
SEK
|
3,032,000,000
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
4,775,000,000
SEK
|
2,454,000,000
SEK
|
887,000,000
SEK
|
— | — | — | — |
780,000,000
SEK
|
4,778,000,000
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
2,402,000,000
SEK
|
709,000,000
SEK
|
—
SEK
|
1,596,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
2,632,000,000
SEK
|
— |
1,712,000,000
SEK
|
16,320,000,000
SEK
|
— |
—
SEK
|
—
SEK
|
3,032,000,000
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
18,952,000,000
SEK
|
15,000,000,000
SEK
|
8,675,000,000
SEK
|
— | — | — | — |
5,054,000,000
SEK
|
4,778,000,000
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
2,402,000,000
SEK
|
1,245,000,000
SEK
|
—
SEK
|
7,430,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
9,708,000,000
SEK
|
— |
—
SEK
|
5,709,000,000
SEK
|
— | — |
—
SEK
|
—
SEK
|
— | — | — | — | — | — | — | — |
15,417,000,000
SEK
|
5,709,000,000
SEK
|
4,000,000
SEK
|
— | — | — | — |
—
SEK
|
—
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
—
SEK
|
4,000,000
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Increase through other contributions by owners, equity |
1,267,000,000
SEK
|
— |
—
SEK
|
—
SEK
|
— |
—
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
1,267,000,000
SEK
|
—
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Decrease through other distributions to owners, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,901,000,000
SEK
|
— | — | — | — |
1,901,000,000
SEK
|
—
SEK
|
—
SEK
|
— | — | — |
—
SEK
|
— |
—
SEK
|
—
SEK
|
—
SEK
|
1,901,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
409,000,000
SEK
|
— |
—
SEK
|
409,000,000
SEK
|
— |
—
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — |
—
SEK
|
— | — | — |
—
SEK
|
409,000,000
SEK
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |