Statement Of Changes In Equity [Abstract]

Altareit - Filing #5984459

Concept	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Increase (decrease) through change in equity of subsidiaries, equity	1,000,000 EUR	1,000,000 EUR	– EUR	0 EUR	– EUR	0 EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR
Increase (decrease) through transactions with owners, equity	79,000,000 EUR	80,000,000 EUR	– EUR	1,000,000 EUR	– EUR	1,000,000 EUR	– EUR	– EUR	134,000,000 EUR	7,000,000 EUR	141,000,000 EUR	7,000,000 EUR
Purchase of treasury shares	—	0 EUR	—	—	—	—	—	—	1,000,000 EUR	—	—	—
Cancellation of treasury shares	– EUR	0 EUR	– EUR	0 EUR	– EUR	0 EUR	– EUR	– EUR	1,000,000 EUR	1,000,000 EUR	– EUR	1,000,000 EUR