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 |
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 change in equity of subsidiaries, equity |
945,000,000
EUR
|
— | — | — |
-
EUR
|
945,000,000
EUR
|
— |
254,000,000
EUR
|
254,000,000
EUR
|
-
EUR
|
— | — |
| Cancellation of treasury shares |
-
EUR
|
2,079,000,000
EUR
|
2,092,000,000
EUR
|
13,000,000
EUR
|
-
EUR
|
-
EUR
|
50,000,000
EUR
|
-
EUR
|
-
EUR
|
-
EUR
|
5,658,000,000
EUR
|
5,708,000,000
EUR
|