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 |
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 conversion of convertible instruments, equity |
174,000,000
SEK
|
2,000,000
SEK
|
176,000,000
SEK
|
176,000,000
SEK
|
2,000,000
SEK
|
158,000,000
SEK
|
158,000,000
SEK
|
156,000,000
SEK
|
| Decrease (increase) through tax on share-based payment transactions, equity | — | — | — | — | — |
2,000,000
SEK
|
2,000,000
SEK
|
2,000,000
SEK
|
| Purchase of treasury shares |
205,000,000
SEK
|
— |
205,000,000
SEK
|
205,000,000
SEK
|
— | — | — | — |
| Cancellation of treasury shares |
2,000,000
SEK
|
2,000,000
SEK
|
—
SEK
|
—
SEK
|
— | — | — | — |