Statement Of Changes In Equity [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 |
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 |
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 |
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 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||
| Increase (decrease) through acquisition of subsidiary, equity |
228,000,000
SEK
|
—
SEK
|
—
SEK
|
—
SEK
|
—
SEK
|
—
SEK
|
163,000,000
SEK
|
65,000,000
SEK
|
163,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through transactions with owners, equity |
9,078,000,000
SEK
|
—
SEK
|
20,158,000,000
SEK
|
—
SEK
|
10,000,000
SEK
|
—
SEK
|
14,686,000,000
SEK
|
5,608,000,000
SEK
|
5,482,000,000
SEK
|
1,901,000,000
SEK
|
—
SEK
|
1,905,000,000
SEK
|
—
SEK
|
4,000,000
SEK
|
—
SEK
|
1,901,000,000
SEK
|
—
SEK
|
—
SEK
|