Statement Of Changes In Equity [Abstract]

Novonesis AS - Filing #1421341

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]
Decrease (increase) through tax on share-based payment transactions, equity	—	186,000,000 DKK	186,000,000 DKK	186,000,000 DKK	37,000,000 DKK	—	37,000,000 DKK	37,000,000 DKK
Purchase of treasury shares	—	1,500,000,000 DKK	1,500,000,000 DKK	1,500,000,000 DKK	1,500,000,000 DKK	—	1,500,000,000 DKK	1,500,000,000 DKK
Sale or issue of treasury shares	—	309,000,000 DKK	309,000,000 DKK	309,000,000 DKK	508,000,000 DKK	—	508,000,000 DKK	508,000,000 DKK
Reduction of issued capital	6,000,000 DKK	- DKK	- DKK	6,000,000 DKK	12,000,000 DKK	12,000,000 DKK	- DKK	- DKK