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 |
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 acquisition of subsidiary, equity |
127,000,000
EUR
|
— |
127,000,000
EUR
|
— | — | — | — |
| Purchase of treasury shares | — |
622,000,000
EUR
|
622,000,000
EUR
|
622,000,000
EUR
|
473,000,000
EUR
|
473,000,000
EUR
|
473,000,000
EUR
|