Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2020-01-01 to 2020-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||
| Statement of changes in equity [line items] | ||||||||||
| Decrease (increase) through tax on share-based payment transactions, equity | — |
2,000,000
EUR
|
2,000,000
EUR
|
2,000,000
EUR
|
— | — | — | — | — | — |
| Purchase of treasury shares | — |
38,000,000
EUR
|
— |
38,000,000
EUR
|
38,000,000
EUR
|
6,000,000
EUR
|
— |
6,000,000
EUR
|
— |
6,000,000
EUR
|
| Sale or issue of treasury shares |
2,000,000
EUR
|
—
EUR
|
30,000,000
EUR
|
—
EUR
|
32,000,000
EUR
|
—
EUR
|
1,000,000
EUR
|
—
EUR
|
2,000,000
EUR
|
3,000,000
EUR
|