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 |
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 |
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 disposal of subsidiary, equity |
5,000,000
EUR
|
— |
7,000,000
EUR
|
— | — |
4,000,000
EUR
|
4,000,000
EUR
|
9,000,000
EUR
|
7,000,000
EUR
|
— | — | — | — |
| Increase (decrease) through conversion of convertible instruments, equity | — |
12,000,000
EUR
|
— | — |
0
EUR
|
— |
13,000,000
EUR
|
13,000,000
EUR
|
— |
0
EUR
|
29,000,000
EUR
|
29,000,000
EUR
|
29,000,000
EUR
|
| Purchase of treasury shares | — | — | — |
31,000,000
EUR
|
— | — |
31,000,000
EUR
|
31,000,000
EUR
|
— | — | — | — | — |