Statement Of Changes In Equity [Abstract]

Besqab - Filing #702831

Concept	2021-01-01 to 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	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	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	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 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	—	9,607,000,000 SEK	—	1 520,5 SEK	—	1 511,8 SEK	3,960,000,000 SEK	87,000,000 SEK	1,551,000,000 SEK	—	—	9,208,000,000 SEK	—	47,000,000 SEK	1 469,7 SEK	1,551,000,000 SEK	—	3,938,000,000 SEK	1 474,4 SEK	—	—	—	1 229,9 SEK	0 SEK	1 229,9 SEK	3,921,000,000 SEK	6,827,000,000 SEK	1,551,000,000 SEK
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	20,000,000 SEK	—	784,000,000 SEK	—	—	—	—	—	—	804,000,000 SEK	784,000,000 SEK	—	2,753,000,000 SEK	—	—	—	2,765,000,000 SEK	—	—	12,000,000 SEK	—	2,765,000,000 SEK	—	—	—	—	—	—
Other comprehensive income	—	—	0 SEK	—	—	—	—	—	—	0 SEK	—	—	0 SEK	—	—	—	—	—	—	—	—	0 SEK	—	—	—	—	—	—
Comprehensive income	20,000,000 SEK	—	784,000,000 SEK	—	—	—	—	—	—	804,000,000 SEK	784,000,000 SEK	—	2,753,000,000 SEK	—	—	—	2,765,000,000 SEK	—	—	12,000,000 SEK	—	2,765,000,000 SEK	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	—	22,000,000 SEK	—	22,000,000 SEK	—	—	—	—	22,000,000 SEK	—	—	17,000,000 SEK	—	—	—	—	—	—	—	17,000,000 SEK	17,000,000 SEK	—	—	—	—	—	—