Statement Of Changes In Equity [Abstract]

Investor AB - Filing #702851

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	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	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	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	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	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 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	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	657 379 SEK	972,000,000 SEK	153,000,000 SEK	—	—	—	—	683 505 SEK	66,000,000 SEK	—	682 614 SEK	8 91 SEK	13 533 SEK	5 847 SEK	4 795 SEK	—	—	—	438 534 SEK	939,000,000 SEK	2 616 SEK	1 3 3 SEK	16 5 SEK	461 837 SEK	4 795 SEK	—	—	2 327 SEK	13 533 SEK	—	4 62 7 75 SEK	—	—	—	—	2 692 SEK	420 681 SEK	6 929 SEK	17 7 SEK	420 923 SEK	13 533 SEK	392 566 SEK	1 1 SEK	4 795 SEK	242,000,000 SEK
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	1 0 0 SEK	—	—	—	—	—	—	228 065 SEK	—	—	—	—	—	—	—	—	227 965 SEK	228 065 SEK	52 662 SEK	—	—	—	—	—	—	—	52 790 SEK	—	—	—	—	—	—	1 2 8 SEK	52 790 SEK	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	26,000,000 SEK	—	—	—	1 2 SEK	67,000,000 SEK	21,000,000 SEK	3 642 SEK	—	—	3 520 SEK	—	—	—	—	—	3 668 SEK	46,000,000 SEK	4 822 SEK	—	—	—	—	—	—	—	57,000,000 SEK	1 2 2 SEK	—	—	1 5 SEK	—	4 601 SEK	1 4 SEK	4 807 SEK	1 2 SEK	—	—	—	—	—	—	—	—	—	—
Comprehensive income	74,000,000 SEK	—	—	—	1 2 SEK	67,000,000 SEK	21,000,000 SEK	231 708 SEK	—	—	3 520 SEK	—	—	—	—	—	231 633 SEK	228 111 SEK	47 8 4 0 SEK	—	—	—	—	—	—	—	52 733 SEK	1 2 2 SEK	—	—	15,000,000 SEK	—	4 601 SEK	1 4 2 SEK	47 982 SEK	1 2 SEK	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	—	—	—	—	—	—	10 722 SEK	—	—	—	—	—	—	—	—	10 722 SEK	10 722 SEK	6 916 SEK	—	—	—	—	—	—	—	6 889 SEK	—	—	—	—	—	—	27,000,000 SEK	6 889 SEK	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	646,000,000 SEK	—	—	—	—	—	—	1 2 6 SEK	—	—	—	—	—	—	—	—	52 1 SEK	1 2 6 SEK	827,000,000 SEK	—	—	—	—	—	—	—	38,000,000 SEK	—	—	—	—	—	—	865,000,000 SEK	38,000,000 SEK	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	—	—	—	—	—	—	8,000,000 SEK	—	—	—	—	—	—	—	—	8,000,000 SEK	8,000,000 SEK	15,000,000 SEK	—	—	—	—	—	—	—	15,000,000 SEK	—	—	—	—	—	—	—	15,000,000 SEK	—	—	—	—	—	—	—	—	—	—	—