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 |
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 |
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 appropriation of retained earnings, equity | — |
301,000,000
EUR
|
— |
301,000,000
EUR
|
301,000,000
EUR
|
— | — | — | — | — | — | — |
1,212,000,000
EUR
|
— |
1,212,000,000
EUR
|
1,212,000,000
EUR
|
— |
| Increase (decrease) through transactions with owners, equity |
119,000,000
EUR
|
301,000,000
EUR
|
67,000,000
EUR
|
796,000,000
EUR
|
901,000,000
EUR
|
105,000,000
EUR
|
1,269,000,000
EUR
|
1,388,000,000
EUR
|
109,000,000
EUR
|
4,000,000
EUR
|
107,000,000
EUR
|
935,000,000
EUR
|
1,212,000,000
EUR
|
111,000,000
EUR
|
150,000,000
EUR
|
150,000,000
EUR
|
207,000,000
EUR
|
| Cancellation of treasury shares | — | — |
67,000,000
EUR
|
33,000,000
EUR
|
33,000,000
EUR
|
— |
100,000,000
EUR
|
100,000,000
EUR
|
— |
149,000,000
EUR
|
— | — | — |
149,000,000
EUR
|
58,000,000
EUR
|
58,000,000
EUR
|
207,000,000
EUR
|
| Reduction of issued capital | — | — | — | — | — | — | — | — |
5,000,000
EUR
|
154,000,000
EUR
|
— |
149,000,000
EUR
|
— |
154,000,000
EUR
|
— | — | — |