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 |
As at 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 |
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 | — |
54,299,000,000
SEK
|
5,237,000,000
SEK
|
9,675,000,000
SEK
|
— |
69,592,000,000
SEK
|
9,000,000
SEK
|
371,000,000
SEK
|
— | — |
47,030,000,000
SEK
|
— |
9,000,000
SEK
|
9,675,000,000
SEK
|
371,000,000
SEK
|
— |
1,794,000,000
SEK
|
— |
58,879,000,000
SEK
|
— |
11,000,000
SEK
|
6,728,000,000
SEK
|
9,675,000,000
SEK
|
59,154,000,000
SEK
|
42,369,000,000
SEK
|
371,000,000
SEK
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||
| Profit (loss) |
1,000,000
SEK
|
— | — | — | — | — | — | — |
10,901,000,000
SEK
|
10,900,000,000
SEK
|
— |
9,172,000,000
SEK
|
— | — | — |
9,171,000,000
SEK
|
— | — | — |
1,000,000
SEK
|
— | — | — | — | — | — |
| Other comprehensive income |
1,000,000
SEK
|
— | — | — |
3,444,000,000
SEK
|
— | — | — |
4,150,000,000
SEK
|
705,000,000
SEK
|
— |
5,197,000,000
SEK
|
— | — | — |
262,000,000
SEK
|
— |
4,934,000,000
SEK
|
— |
1,000,000
SEK
|
— | — | — | — | — | — |
| Comprehensive income |
1,000,000
SEK
|
— | — | — |
3,444,000,000
SEK
|
— | — | — |
15,050,000,000
SEK
|
11,605,000,000
SEK
|
— |
3,975,000,000
SEK
|
— | — | — |
8,909,000,000
SEK
|
— |
4,934,000,000
SEK
|
— |
0
SEK
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners |
2,000,000
SEK
|
— | — | — | — | — | — | — |
4,333,000,000
SEK
|
4,332,000,000
SEK
|
— |
4,277,000,000
SEK
|
— | — | — |
4,276,000,000
SEK
|
— | — | — |
1,000,000
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity |
–
SEK
|
— | — | — | — | — | — | — |
–
SEK
|
–
SEK
|
— |
0
SEK
|
— | — | — |
1,000,000
SEK
|
— | — | — |
1,000,000
SEK
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
SEK
|
— | — | — | — | — | — | — |
5,000,000
SEK
|
5,000,000
SEK
|
— |
28,000,000
SEK
|
— | — | — |
28,000,000
SEK
|
— | — | — |
–
SEK
|
— | — | — | — | — | — |